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Extending Informix®
Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix includes many built-in extensions that are fully integrated in the database server. Informix also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix.
Creating extensions
You can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® API Function Reference
The Informix® DataBlade® API Function Reference describes the DataBlade API functions and the subset of Informix ESQL/C functions that the DataBlade API supports.
Function descriptions
This section gives comprehensive reference information about the functions that are valid within DataBlade® API modules. It lists the function descriptions in alphabetical order, with syntax, usage information, and return values for the functions.
The mi_call_on_vp() function
The mi_call_on_vp() function enables you to switch execution to a specified virtual processor (VP) to execute a specified C function.

Extending Informix®
Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix includes many built-in extensions that are fully integrated in the database server. Informix also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix.
- Informix® extensions and DataBlade® modules
  These topics describe how to use built-in database extensions and separately installed DataBlade® modules.
- Creating extensions
  You can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
  - DataBlade® API Programmer's Guide
    The Informix® DataBlade® API Programmer's Guide describes information about the DataBlade API, the C-language application programming interface (API) provided with HCL Informix.
  - DataBlade® API Function Reference
    The Informix® DataBlade® API Function Reference describes the DataBlade API functions and the subset of Informix ESQL/C functions that the DataBlade API supports.
    - Categories of DataBlade® API functions
      This section summarizes by categories the functions that the DataBlade® API provides. It divides functions that are valid within DataBlade API modules into several functional categories and lists the functions within each category.
    - Function descriptions
      This section gives comprehensive reference information about the functions that are valid within DataBlade® API modules. It lists the function descriptions in alphabetical order, with syntax, usage information, and return values for the functions.
      - The ax_reg() function
        The ax_reg() function allows DataBlade® modules or applications using user-defined routines (UDRs) to register XA-compliant, external data sources (also called resource managers) with the HCL Informix® transaction manager. The registration is dynamic and is applicable for the current transaction only. The DataBlade must register participating data sources into each transaction.
      - The ax_unreg() function
        The ax_unreg() function allows DataBlade® modules or applications using user-defined routines (UDRs) to unregister previously registered XA-compliant, external data sources (also called resource managers) from transactions.
      - The biginttoint2() function
        The biginttoint2() function converts a BIGINT type number to an int2 type number.
      - The bigintcvint2() function
        The bigintcvint2() function converts an int2 type number to a BIGINT type number.
      - The biginttoint4() function
        The biginttoint4() function converts a BIGINT type number to an int4 type number.
      - The bigintcvint4() function
        The bigintcvint4() function converts an int4 type number to a BIGINT type number.
      - The biginttoasc() function
        The biginttoasc() function converts a BIGINT type value to a C char type value.
      - The bigintcvasc() function
        The bigintcvasc() function converts a C char type value to a BIGINT type number.
      - The bigintcvdec() function
        The bigintcvdec() function converts a decimal type number to a BIGINT type number.
      - The biginttodec() function
        The biginttodec() function converts a BIGINT type number to a decimal type number.
      - The biginttodbl() function
        The biginttodbl() function converts a BIGINT type number to a double type number.
      - The bigintcvdbl() function
        The bigintcvdbl() function converts a double type number to a BIGINT type number.
      - The biginttoflt() function
        The biginttoflt() function converts a BIGINT type number to a float type number.
      - The bigintcvflt() function
        The bigintcvflt() function converts a float type number to a BIGINT type number.
      - The bigintcvifx_int8() function
        The bigintcvifx_int8() function converts and int8 type number to a BIGINT type number.
      - The biginttoifx_int8() function
        The biginttoifx_int8() function converts a BIGINT type number to an int8 type number.
      - The bycmpr() function
        The bycmpr() function compares two groups of contiguous bytes for a given length. This function returns the result of the comparison.
      - The bycopy() function
        The bycopy() function copies a given number of bytes from one location to another.
      - The byfill() function
        The byfill() function fills a specified area with one character.
      - The byleng() function
        The byleng() function returns the number of significant characters in a string, not counting trailing blanks.
      - The decadd() function
        The decadd() function adds two decimal type values.
      - The deccmp() function
        The deccmp() function compares two decimal type numbers.
      - The deccopy() function
        The deccopy() function copies a value from one decimal structure to another.
      - The deccvasc() function
        The deccvasc() function converts a value held as printable characters in a C char type into a decimal type number.
      - The deccvdbl() function
        The deccvdbl() function converts a C double type number into a decimal type number.
      - The deccvint() function
        The deccvint() function converts a C int type number into a decimal type number.
      - The deccvlong() function
        The deccvlong() function converts an int4 type value into a decimal type value.
      - The decdiv() function
        The decdiv() function divides two decimal type values.
      - The dececvt() and decfcvt() functions
        The dececvt() and decfcvt() functions are analogous to the subroutines under ECVT(3) in the UNIX™ Programmer's Manual.
      - The decmul() function
        The decmul() function multiplies two decimal type values.
      - The decround() function
        The decround() function rounds a decimal type number to fractional digits.
      - The decsub() function
        The decsub() function subtracts two decimal type values.
      - The dectoasc() function
        The dectoasc() function converts a decimal type number to a C char type value.
      - The dectodbl() function
        The dectodbl() function converts a decimal type number into a C double type number.
      - The dectoint() function
        The dectoint() function converts a decimal type number into a C int type number.
      - The dectolong() function
        The dectolong() function converts a decimal type number into an int4 type number.
      - The dectrunc() function
        The dectrunc() function truncates a rounded decimal type number to fractional digits.
      - The dtaddinv() function
        The dtaddinv() function adds an interval value to a datetime value. The result is a datetime value.
      - The dtcurrent() function
        The dtcurrent() function assigns the current date and time to a datetime variable.
      - The dtcvasc() function
        The dtcvasc() function converts a string that conforms to ANSI SQL standard for a DATETIME value to a datetime value.
      - The dtcvfmtasc() function
        The dtcvfmtasc() function uses a formatting mask to convert a character string to a datetime value.
      - The dtextend() function
        The dtextend() function extends a datetime value to a different qualifier. Extending is the operation of adding or dropping fields of a DATETIME value to make it match a given qualifier.
      - The dtsub() function
        The dtsub() function subtracts one datetime value from another. The result is an interval value.
      - The dtsubinv() function
        The dtsubinv() function subtracts an interval value from a datetime value. The result is a datetime value.
      - The dttoasc() function
        The dttoasc() function converts the field values of a datetime variable to an ASCII string that conforms to ANSI SQL standards.
      - The dttofmtasc() function
        The dttofmtasc() function uses a formatting mask to convert a datetime variable to a character string.
      - The ifx_int8add() function
        The ifx_int8add() function adds two int8 type values.
      - The ifx_int8cmp() function
        The ifx_int8cmp() function compares two int8 type numbers.
      - The ifx_int8copy() function
        The ifx_int8copy() function copies one int8 structure to another.
      - The ifx_int8cvasc() function
        The ifx_int8cvasc() function converts a value held as printable characters in a C char type into an int8 type number.
      - The ifx_int8cvdbl() function
        The ifx_int8cvdbl() function converts a C double type number into an int8 type number.
      - The ifx_int8cvdec() function
        The ifx_int8cvdec() function converts a decimal type value into an int8 type value.
      - The ifx_int8cvflt() function
        The ifx_int8cvflt() function converts a C float type number into an int8 type number.
      - The ifx_int8cvint() function
        The ifx_int8cvint() function converts a C int type number into an int8 type number.
      - The ifx_int8cvlong() function
        The ifx_int8cvlong() function converts a C long type value into an int8 type value.
      - The ifx_int8div() function
        The ifx_int8div() function divides two int8 type values.
      - The ifx_int8mul() function
        The ifx_int8mul() function multiplies two int8 type values.
      - The ifx_int8sub() function
        The ifx_int8sub() function subtracts two int8 type values.
      - The ifx_int8toasc() function
        The ifx_int8toasc() function converts an int8 type number to a C char type value.
      - The ifx_int8todbl() function
        The ifx_int8todbl() function converts an int8 type number into a C double type number.
      - The ifx_int8todec() function
        The ifx_int8todec() function converts an int8 type number into a decimal type number.
      - The ifx_int8toflt() function
        The ifx_int8toflt() function converts an int8 type number into a C float type number.
      - The ifx_int8toint() function
        The ifx_int8toint() function converts an int8 type number into a C int type number.
      - The ifx_int8tolong() function
        The ifx_int8tolong() function converts an int8 type number into a C long type number.
      - The incvasc() function
        The incvasc() function converts a string that conforms to the ANSI SQL standard for an INTERVAL value to an interval value.
      - The incvfmtasc() function
        The incvfmtasc() function uses a formatting mask to convert a character string to an interval value.
      - The intoasc() function
        The intoasc() function converts the field values of an interval variable to an ASCII string that conforms to the ANSI SQL standard.
      - The intofmtasc() function
        The intofmtasc() function uses a formatting mask to convert an interval variable to a character string.
      - The invdivdbl() function
        The invdivdbl() function divides an interval value by a numeric value.
      - The invdivinv() function
        The invdivinv() function divides an interval value by another interval value.
      - The invextend() function
        The invextend() function copies an interval value under a different qualifier.
      - The invmuldbl() function
        The invmuldbl() function multiplies an interval value by a numeric value.
      - The ldchar() function
        The ldchar() function copies a fixed-length string into a null-terminated string and removes any trailing blanks.
      - The mi_alloc() function
        The mi_alloc() function allocates a block of user memory of a specified size and returns a pointer to that block.
      - The mi_binary_to_date() function
        The mi_binary_to_date() function creates a text (string) representation of a date from the internal (binary) DATE representation.
      - The mi_binary_to_datetime() function
        The mi_binary_to_datetime() function creates a text (string) representation of a date, time, or date and time value from the binary DATETIME representation.
      - The mi_binary_to_decimal() function
        The mi_binary_to_decimal() function creates a text (string) representation of a decimal value from the internal (binary) DECIMAL representation.
      - The mi_binary_to_money() function
        The mi_binary_to_money() function creates a text (string) representation of a monetary value from the internal (binary) MONEY representation.
      - The mi_binary_query() function
        The mi_binary_query() function reports whether the last SQL statement sent on a particular connection returns results in a binary representation.
      - The mi_call() function
        The mi_call() function checks if there is sufficient stack space for the specified user-defined routine and extends the stack size if necessary.
      - The mi_call_on_vp() function
        The mi_call_on_vp() function enables you to switch execution to a specified virtual processor (VP) to execute a specified C function.
      - The mi_cast_get() function
        The mi_cast_get() function looks up a registered cast function by the type identifiers of its source and target data types and creates its function descriptor.
      - The mi_class_id() function
        The mi_class_id() function obtains the VP-class identifier for a specified virtual-processor (VP) class.
      - The mi_class_maxvps() function
        The mi_class_maxvps() function obtains the maximum number of virtual processors (VPs) in a VP class.
      - The mi_class_name() function
        The mi_class_name() function obtains the name of a virtual-processor (VP) class.
      - The mi_class_numvp() function
        The mi_class_numvp() function obtains the number of active virtual processors (VPs) in a VP class.
      - The mi_client() function
        The mi_client() function dynamically determines whether a DataBlade® API module is running in the database server or as a client application.
      - The mi_client_locale() function
        The mi_client_locale() function returns the name of the client locale.
      - The mi_close() function
        The mi_close() function closes a connection.
      - The mi_close_statement() function
        The mi_close_statement() function closes an open cursor.
      - The mi_collection_card() function
        The mi_collection_card() function returns a count of the elements in a collection (that is, its cardinality).
      - The mi_collection_close() function
        The mi_collection_close() function closes a collection and frees the collection descriptor.
      - The mi_collection_copy() function
        The mi_collection_copy() function copies a collection to a new collection variable.
      - The mi_collection_create() function
        The mi_collection_create() function creates a collection.
      - The mi_collection_delete() function
        The mi_collection_delete() function deletes a single element of a collection.
      - The mi_collection_fetch() function
        The mi_collection_fetch() function fetches a single element from a collection.
      - The mi_collection_free() function
        The mi_collection_free() function frees a collection.
      - The mi_collection_insert() function
        The mi_collection_insert() function inserts a single element into a collection.
      - The mi_collection_open() function
        The mi_collection_open() function opens a collection.
      - The mi_collection_open_with_options() function
        The mi_collection_open_with_options() function opens a collection in a specified open mode.
      - The mi_collection_update() function
        The mi_collection_update() function updates a collection.
      - The mi_column_count() function
        The mi_column_count() function obtains the number of columns in a row descriptor.
      - The mi_column_default() function
        The mi_column_default() function retrieves the default value of the specified column.
      - The mi_column_default_string() function
        The mi_column_default_string() function retrieves the default value of the specified column in string format.
      - The mi_column_id() function
        The mi_column_id() function obtains the column identifier of a specified column from a row descriptor.
      - The mi_column_name() function
        The mi_column_name() function obtains the name of a specified column from a row descriptor.
      - The mi_column_nullable() function
        The mi_column_nullable() function indicates whether a specified column in a row descriptor can contain SQL NULL values.
      - The mi_column_precision() function
        The mi_column_precision() function obtains the precision of the specified column from a row descriptor.
      - The mi_column_scale() function
        The mi_column_scale() function obtains the scale of the specified column from a row descriptor.
      - The mi_column_type_id() function
        The mi_column_type_id() function obtains the type identifier of the specified column from a row descriptor.
      - The mi_column_typedesc() function
        The mi_column_typedesc() function obtains the type descriptor of the specified column from a row descriptor.
      - The mi_command_is_finished() function
        The mi_command_is_finished() function reports whether the current statement has finished executing.
      - The mi_current_command_name() function
        The mi_current_command_name() function returns the name of the SQL statement that invoked the C UDR.
      - The mi_dalloc() function
        The mi_dalloc() function allocates the specified amount of memory for the specified memory duration and returns a pointer to the allocated block.
      - The mi_date_to_binary() function
        The mi_date_to_binary() function converts a text (string) representation of a date value to its binary (internal) DATE representation.
      - The mi_date_to_string() function
        The mi_date_to_string() function creates a text (string) representation of a date value from the binary (internal) DATE representation.
      - The mi_datetime_compare() function
        The mi_datetime_compare() function compares two binary (internal) DATETIME values and returns an integer value that indicates whether the first value is before, equal to, or after the second value.
      - The mi_datetime_to_binary() function
        The mi_datetime_to_binary() function converts a text (string) representation of a date, time, or date and time value to its binary (internal) DATETIME representation.
      - The mi_datetime_to_string() function
        The mi_datetime_to_string() function creates an ANSI SQL standard text (string) representation of a date, time, or date and time value from the binary (internal) DATETIME representation.
      - The mi_db_error_raise() function
        The mi_db_error_raise() function raises an error or warning and sends the message to the calling program.
      - The mi_dbcreate() function
        The mi_dbcreate() function creates a new database on the given connection.
      - The mi_dbdrop() function
        The mi_dbdrop() function drops a database from the given connection.
      - The mi_decimal_to_binary() function
        The mi_decimal_to_binary() function converts a text (string) representation of a decimal value to its binary (internal) DECIMAL representation.
      - The mi_decimal_to_string() function
        The mi_decimal_to_string() function creates a text (string) representation of a decimal value from the binary (internal) DECIMAL representation.
      - The mi_default_callback() function
        The mi_default_callback() function is the system-default callback for all callbacks in a client LIBMI application.
      - The mi_disable_callback() function
        The mi_disable_callback() function disables a callback for a single event or for all events.
      - The mi_drop_prepared_statement() function
        The mi_drop_prepared_statement() function drops a previously prepared statement.
      - The mi_enable_callback() function
        The mi_enable_callback() function enables a callback for a specified event type.
      - The mi_errmsg() function
        The mi_errmsg() function retrieves an error or warning message from an error descriptor into a user-allocated buffer.
      - The mi_error_desc_copy() function
        The mi_error_desc_copy() function returns a copy of a specified error descriptor.
      - The mi_error_desc_destroy() function
        The mi_error_desc_destroy() function frees an error descriptor that the mi_error_desc_copy() function allocated.
      - The mi_error_desc_finish() function
        The mi_error_desc_finish() function completes processing of the current exception list.
      - The mi_error_desc_is_copy() function
        The mi_error_desc_is_copy() function determines whether the specified error descriptor is a user copy.
      - The mi_error_desc_next() function
        The mi_error_desc_next() function gets the next error descriptor from the list of current exceptions that are associated with the current SQL statement.
      - The mi_error_level() function
        The mi_error_level() function retrieves from an error descriptor the exception level associated with an exception or an error level associated with a client LIBMI error.
      - The mi_error_sql_state() function
        The mi_error_sql_state() function retrieves the value of the SQLSTATE status variable from an error descriptor.
      - The mi_error_sqlcode() function
        The mi_error_sqlcode() function retrieves the value of the HCL Informix® SQLCODE status variable from an error descriptor.
      - The mi_exec() function
        The mi_exec() function sends an SQL statement to the database server for parsing, optimization, and execution.
      - The mi_exec_prepared_statement() function
        The mi_exec_prepared_statement() function sends a prepared statement to the database server for execution.
      - The mi_fetch_statement() function
        The mi_fetch_statement() function fetches specified rows from the database server into a cursor that is associated with an opened prepared statement.
      - The mi_file_allocate() function
        The mi_file_allocate() function ensures that a specified number of files are available to be opened.
      - The mi_file_close() function
        The mi_file_close() function closes an operating-system file.
      - The mi_file_errno() function
        The mi_file_errno() function returns the value of the system errno variable after a file input/output (I/O) operation. This value is the last errno value generated during an mi_file* function call and comes from the computer where the file is located. This function does not translate the value from one platform to another.
      - The mi_file_open() function
        The mi_file_open() function opens an operating-system file.
      - The mi_file_read() function
        The mi_file_read() function reads a specified number of bytes from an open operating-system file into a buffer.
      - The mi_file_seek() function
        The mi_file_seek() function sets the file seek position for the next read or write operation on the open file.
      - The mi_file_seek8() function
        The mi_file_seek8() function sets the file seek position for the next read or write operation on an open file of length greater that 2 GB.
      - The mi_file_sync() function
        The mi_file_sync() function forces a write to disk of all pages in an operating-system file.
      - The mi_file_tell() function
        The mi_file_tell() function returns the current file seek position for an operating-system file, relative to the beginning of the file.
      - The mi_file_tell8() function
        The mi_file_tell8() function returns the current file seek position, relative to the beginning of the file, for an operating-system file of length greater than 2 GB.
      - The mi_file_to_file() function
        The mi_file_to_file() function copies files between the database server and a client computer.
      - The mi_file_unlink() function
        The mi_file_unlink() function unlinks (removes) a file that mi_file_open() previously opened.
      - The mi_file_write() function
        The mi_file_write() function writes a specified number of bytes to an open operating-system file.
      - The mi_fix_integer() function
        The mi_fix_integer() function converts the specified 4-byte integer to or from the byte order of the client computer.
      - The mi_fix_smallint() function
        The mi_fix_smallint() function converts the specified 2-byte integer to or from the byte order of the client computer.
      - The mi_fp_argisnull() function
        The mi_fp_argisnull() accessor function determines whether the argument of a user-defined routine is an SQL NULL value from its associated MI_FPARAM structure.
      - The mi_fp_arglen() function
        The mi_fp_arglen() accessor function obtains the length of an argument of a user-defined routine from its associated MI_FPARAM structure.
      - The mi_fp_argprec() function
        The mi_fp_argprec() accessor function obtains the precision of an argument of a user-defined routine from its associated MI_FPARAM structure.
      - The mi_fp_argscale() function
        The mi_fp_argscale() accessor function obtains the scale of an argument of a user-defined routine from its associated MI_FPARAM structure.
      - The mi_fp_argtype() function
        The mi_fp_argtype() accessor function obtains the type identifier for the data type of an argument of a user-defined routine from the argument's associated MI_FPARAM structure.
      - The mi_fp_funcname() function
        The mi_fp_funcname() function obtains the name of a user-defined routine (UDR) using its associated MI_FPARAM structure.
      - The mi_fp_funcstate() function
        The mi_fp_funcstate() accessor function obtains user-state information for the user-defined routine from its associated MI_FPARAM structure.
      - The mi_fp_getcolid() function
        The mi_fp_getcolid() accessor function obtains the column identifier of the column that is associated with the user-defined routine from its MI_FPARAM structure.
      - The mi_fp_getfuncid() function
        The mi_fp_getfuncid() accessor function obtains the routine identifier for a user-defined routine (UDR) in its associated MI_FPARAM structure.
      - The mi_fp_getrow() function
        The mi_fp_getrow() accessor function obtains the row structure that is associated with the user-defined routine from its MI_FPARAM structure.
      - The mi_fp_nargs() function
        The mi_fp_nargs() accessor function obtains the number of arguments for the UDR routine from its associated MI_FPARAM structure.
      - The mi_fp_nrets() function
        The mi_fp_nrets() accessor function obtains the number of return values for the UDR from its associated MI_FPARAM structure.
      - The mi_fp_request() function
        The mi_fp_request() accessor function obtains the iterator status for an iterator function from an associated MI_FPARAM structure.
      - The mi_fp_retlen() function
        The mi_fp_retlen() accessor function obtains the length of a return value of a user-defined function from its associated MI_FPARAM structure.
      - The mi_fp_retprec() function
        The mi_fp_retprec() accessor function obtains the precision of a return value of a user-defined function from its associated MI_FPARAM structure.
      - The mi_fp_retscale() function
        The mi_fp_retscale() accessor function obtains the scale of a return value of a user-defined function from its associated MI_FPARAM structure.
      - The mi_fp_rettype() function
        The mi_fp_rettype() accessor function obtains the type identifier for the data type of a return value of a user-defined function from its associated MI_FPARAM structure.
      - The mi_fp_returnisnull() function
        The mi_fp_returnisnull() accessor function determines whether the return value of a user-defined function is an SQL NULL from its associated MI_FPARAM structure.
      - The mi_fp_setargisnull() function
        The mi_fp_setargisnull() accessor function sets the value of an argument of a user-defined routine to an SQL NULL in its associated MI_FPARAM structure.
      - The mi_fp_setarglen() function
        The mi_fp_setarglen() accessor function sets the length of an argument of a user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setargprec() function
        The mi_fp_setargprec() accessor function sets the precision of a fixed-point or floating-point argument of a user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setargscale() function
        The mi_fp_setargscale() accessor function sets the scale of an argument of a user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setargtype() function
        The mi_fp_setargtype() accessor routine sets the type identifier for the data type of an argument of a user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setcolid() function
        The mi_fp_setcolid() accessor function sets the column identifier of the column that is associated with the user-defined routine from its MI_FPARAM structure.
      - The mi_fp_setfuncid() function
        The mi_fp_setfuncid() accessor function sets the routine identifier for a user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setfuncstate() function
        The mi_fp_setfuncstate() accessor function sets the user-state pointer for the user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setisdone() function
        The mi_fp_setisdone() accessor function sets the iterator-completion flag for an iterator function in its associated MI_FPARAM structure.
      - The mi_fp_setnargs() function
        The mi_fp_setnargs() accessor function sets the number of arguments for the user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_setnrets() function
        The mi_fp_setnrets() accessor function sets the number of return values for the user-defined function in its associated MI_FPARAM structure.
      - The mi_fp_setretlen() function
        The mi_fp_setretlen() accessor function sets the length of a return value of a user-defined function from its associated MI_FPARAM structure.
      - The mi_fp_setretprec() function
        The mi_fp_setretprec() accessor function sets the precision of a return value of a user-defined function in its associated MI_FPARAM structure.
      - The mi_fp_setretscale() function
        The mi_fp_setretscale() accessor function sets the scale of a return value of a user-defined function in its associated MI_FPARAM structure.
      - The mi_fp_setrettype() function
        The mi_fp_setrettype() accessor function sets the type identifier for the data type of a return value of a user-defined function in its associated MI_FPARAM structure.
      - The mi_fp_setreturnisnull() function
        The mi_fp_setreturnisnull() accessor function sets the value of a return value of a user-defined function to an SQL NULL in its associated MI_FPARAM structure.
      - The mi_fp_setrow() function
        The mi_fp_setrow() accessor function sets the row structure that is associated with the user-defined routine in its associated MI_FPARAM structure.
      - The mi_fp_usr_fparam() function
        The mi_fp_usr_fparam() accessor function determines whether the database server or the developer has allocated the specified MI_FPARAM structure.
      - The mi_fparam_allocate() function
        The mi_fparam_allocate() function allocates an MI_FPARAM structure and returns a pointer to this structure.
      - The mi_fparam_copy() function
        The mi_fparam_copy() function copies an existing MI_FPARAM structure to a newly allocated MI_FPARAM structure field by field.
      - The mi_fparam_free() function
        The mi_fparam_free() function deallocates resources used by an MI_FPARAM structure allocated on behalf of a user-defined routine.
      - The mi_fparam_get() function
        The mi_fparam_get() function retrieves a pointer to the MI_FPARAM structure that is associated with the function descriptor of a user-defined routine.
      - The mi_fparam_get_current() function
        The mi_fparam_get_current() function obtains the MI_FPARAM structure for the currently running user-defined routine (UDR).
      - The mi_free() function
        The mi_free() routine frees the user memory that was previously allocated with the mi_alloc(), mi_dalloc(), or mi_zalloc() function.
      - The mi_func_commutator() function
        The mi_func_commutator() function obtains the name of a commutator function for a user-defined function.
      - The mi_func_desc_by_typeid() function
        The mi_func_desc_by_typeid() function looks up a registered user-defined routine by its routine identifier and creates its function descriptor.
      - The mi_func_handlesnulls() function
        The mi_func_handlesnulls() function determines whether a user-defined routine (UDR) can handle SQL NULL values.
      - The mi_func_isvariant() function
        The mi_func_isvariant() function determines whether a user-defined function is variant.
      - The mi_func_negator() function
        The mi_func_negator() function obtains the name of a negator function for a user-defined function.
      - The mi_funcarg_get_argtype() function
        The mi_funcarg_get_argtype() function returns the argument type for the companion-UDR argument of a cost or selectivity function.
      - The mi_funcarg_get_colno() function
        The mi_funcarg_get_colno() function returns the column number for the column associated with the companion-UDR argument of a cost or selectivity function.
      - The mi_funcarg_get_constant() function
        The mi_funcarg_get_constant() function returns the constant value of a companion-UDR argument of a cost or selectivity function.
      - The mi_funcarg_get_datalen() function
        The mi_funcarg_get_datalen() function returns the data length of an argument for the companion UDR of a cost or selectivity function.
      - The mi_funcarg_get_datatype() function
        The mi_funcarg_get_datatype() function returns the type identifier for the data type of an argument for the companion UDR of a cost or selectivity function.
      - The mi_funcarg_get_distrib() function
        The mi_funcarg_get_distrib() function returns the data-distribution information for the column associated with the companion-UDR argument of a cost or selectivity function.
      - The mi_funcarg_get_routine_id() function
        The mi_funcarg_get_routine_id() function returns the routine identifier for the companion UDR of a cost or selectivity function.
      - The mi_funcarg_get_routine_name() function
        The mi_funcarg_get_routine_name() function returns the routine name for the companion UDR of a cost or selectivity function.
      - The mi_funcarg_get_tabid() function
        The mi_funcarg_get_tabid() function returns the table identifier for the column associated with the companion-UDR argument of a cost or selectivity function.
      - The mi_funcarg_isnull() function
        The mi_funcarg_isnull() function determines whether the companion-UDR argument of a cost or selectivity function contains the SQL NULL value.
      - The mi_get_bigint() function
        The mi_get_bigint() function copies an mi_bigint (BIGINT) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_bytes() function
        The mi_get_bytes() function copies the given number of bytes, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_connection_info() function
        The mi_get_connection_info() function populates a connection-information descriptor with current connection parameters for an open connection.
      - The mi_get_connection_option() function
        The mi_get_connection_option() function returns information about the database of the current connection.
      - The mi_get_connection_user_data() function
        The mi_get_connection_user_data() function obtains the address of user data associated with an open connection.
      - The mi_get_cursor_table() function
        The mi_get_cursor_table() function obtains the name of the database table that is associated with a specified cursor.
      - The mi_get_database_info() function
        The mi_get_database_info() function populates a database-information descriptor with current database parameters for an open connection.
      - The mi_get_date() function
        The mi_get_date() function copies an mi_date (DATE) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_datetime() function
        The mi_get_datetime() function copies an mi_datetime (DATETIME) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_db_locale() function
        The mi_get_db_locale() function returns the value of the current database locale.
      - The mi_get_dbnames() function
        The mi_get_dbnames() function retrieves the names of all databases available on the database server, corresponding to the logged-in connection.
      - The mi_get_decimal() function
        The mi_get_decimal() function copies an mi_decimal (DECIMAL) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_default_connection_info() function
        The mi_get_default_connection_info() function populates a connection-information descriptor with the default connection parameters.
      - The mi_get_default_database_info() function
        The mi_get_default_database_info() function populates a database-information descriptor with the default database parameters.
      - The mi_get_double_precision() function
        The mi_get_double_precision() function copies an mi_double_precision (FLOAT) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_duration_size() function
        The mi_get_duration_size() function returns the TOTAL pool size of the specified memory duration.
      - The mi_get_id() function
        The mi_get_id() function enables you to obtain statement identifiers or session identifiers.
      - The mi_get_int8() function
        The mi_get_int8() function copies an mi_int8 (INT8) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_integer() function
        The mi_get_integer() function copies an mi_integer (INTEGER) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_interval() function
        The mi_get_interval() function copies an mi_interval (INTERVAL) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_lo_handle() function
        The mi_get_lo_handle() function copies an LO handle, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_memptr_duration() function
        The mi_get_memptr_duration() function returns the memory duration of a specified pointer.
      - The mi_get_money() function
        The mi_get_money() function copies an mi_money (MONEY) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_next_sysname() function
        The mi_get_next_sysname() function retrieves the next database server name.
      - The mi_get_parameter_info() function
        The mi_get_parameter_info() function populates a parameter-information descriptor with the current session parameters.
      - The mi_get_real() function
        The mi_get_real() function copies an mi_real (SMALLFLOAT) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_result() function
        The mi_get_result() function returns the status of the current statement.
      - The mi_get_row_desc() function
        The mi_get_row_desc() function obtains a pointer to the row descriptor for the specified row.
      - The mi_get_row_desc_from_type_desc() function
        The mi_get_row_desc_from_type_desc() function obtains a row descriptor that is associated with the specified type descriptor.
      - The mi_get_row_desc_without_row() function
        The mi_get_row_desc_without_row() function obtains the row descriptor for the current statement.
      - The mi_get_serverenv() function
        The mi_get_serverenv() function obtains information from the server environment.
      - The mi_get_session_connection() function
        The mi_get_session_connection() function obtains a session-duration connection descriptor.
      - The mi_get_smallint() function
        The mi_get_smallint() function copies an mi_smallint (SMALLINT) value, converting any difference in alignment or byte order on the client computer to that of the server computer.
      - The mi_get_statement_row_desc() function
        The mi_get_statement_row_desc() function obtains the row descriptor for a prepared statement.
      - The mi_get_string() function
        The mi_get_string() function copies an mi_string (CHAR(x)) value from a buffer.
      - The mi_get_type_source_type() function
        The mi_get_type_source_type() function obtains a type descriptor for the source of a distinct type.
      - The mi_get_transaction_id() function
        The mi_get_transaction_id() function obtains the current internal transaction ID.
      - The mi_get_vardata() function
        The mi_get_vardata() accessor function returns a pointer to the data contained in a varying-length structure (such as mi_lvarchar).
      - The mi_get_vardata_align() function
        The mi_get_vardata_align() accessor function obtains a pointer to the data in a varying-length structure (such as mi_lvarchar) and adjusts for any initial padding required to align the data.
      - The mi_get_varlen() function
        The mi_get_varlen() accessor function returns the length of the data stored in a varying-length structure (such as mi_lvarchar).
      - The mi_hdr_status() function
        The mi_hdr_status() function returns the high-availability cluster replication status of the current server.
      - The mi_init_library() function
        The mi_init_library() function initializes the DataBlade® API library.
      - The mi_interrupt_check() function
        The mi_interrupt_check() function checks for a user interrupt.
      - The mi_interval_compare() function
        The mi_interval_compare() function compares two binary (internal) INTERVAL values and returns an integer value that indicates whether the first value is before, equal to, or after the second value.
      - The mi_interval_to_string() function
        The mi_interval_to_string() function creates an ANSI SQL standards text (string) representation of an interval value from its binary (internal) INTERVAL representation.
      - The mi_issmall_data() function
        The mi_issmall_data() macro determines whether storage of data is or is not in a smart large object.
      - The mi_last_serial() function
        The mi_last_serial() function returns a SERIAL value that the database server has generated for the most recent INSERT statement on a SERIAL column.
      - The mi_last_serial8() function
        The mi_last_serial8() function obtains the SERIAL8 value that the database server generated for the most recent INSERT statement on a SERIAL8 column.
      - The mi_library_version() function
        The mi_library_version() function returns the version and version date of the DataBlade® API currently being used.
      - The mi_lo_alter() function
        The mi_lo_alter() function alters the storage characteristics of an existing smart large object.
      - The mi_lo_close() function
        The mi_lo_close() function closes an open smart large object.
      - The mi_lo_colinfo_by_ids() function
        The mi_lo_colinfo_by_ids() function sets the fields of an LO-specification structure to the column-level storage characteristics for specified row descriptor and column identifier.
      - The mi_lo_colinfo_by_name() function
        The mi_lo_colinfo_by_name() function sets the fields of an LO-specification structure to the column-level storage characteristics for a specified database column.
      - The mi_lo_copy() function
        The mi_lo_copy() function creates a copy of a smart large object and opens the copy.
      - The mi_lo_create() function
        The mi_lo_create() function creates a new smart large object and opens it for access within a DataBlade® API module.
      - The mi_lo_decrefcount() function
        The mi_lo_decrefcount() function decrements the reference count of a smart large object.
      - The mi_lo_delete_immediate() function
        The mi_lo_delete_immediate() function deletes a smart large object.
      - The mi_lo_expand() function
        The mi_lo_expand() function copies multirepresentational data to a new smart large object.
      - The mi_lo_filename() function
        The mi_lo_filename() function constructs a file name for smart-large-object data based on an LO handle and a file name specification.
      - The mi_lo_from_buffer() function
        The mi_lo_from_buffer() function copies a specified number of bytes from a user-defined buffer to an existing smart large object.
      - The mi_lo_from_file() function
        The mi_lo_from_file() function copies the contents of an operating-system file on the server or client computer to a new smart large object.
      - The mi_lo_from_file_by_lofd() function
        The mi_lo_from_file_by_lofd() function copies the contents of an operating-system file on the server or client computer to an open smart large object.
      - The mi_lo_from_string() function
        The mi_lo_from_string() function converts an LO handle in its text representation to its binary representation.
      - The mi_lo_increfcount() function
        The mi_lo_increfcount() function increments the reference count of a smart large object.
      - The mi_lo_invalidate() function
        The mi_lo_invalidate() function marks the LO handle as invalid.
      - The mi_lo_lock() function
        The mi_lo_lock() function obtains a byte-range lock on the specified number of bytes in a smart large object.
      - The mi_lo_lolist_create() function
        The mi_lo_lolist_create() function converts an array of LO handles into an MI_LO_LIST structure.
      - The mi_lo_open() function
        The mi_lo_open() function opens an existing smart large object for access.
      - The mi_lo_ptr_cmp() function
        The mi_lo_ptr_cmp() function compares two LO handles to determine if they reference the same smart large object.
      - The mi_lo_read() function
        The mi_lo_read() function reads a specified number of bytes of data from an open smart large object into a buffer.
      - The mi_lo_readwithseek() function
        The mi_lo_readwithseek() function performs a seek operation and then reads a specified number of bytes of data from an open smart large object.
      - The mi_lo_release() function
        The mi_lo_release() function tells the database server that the resources that are associated with a temporary smart large object can be released.
      - The mi_lo_seek() function
        The mi_lo_seek() function sets the LO seek position for the next read or write operation on an open smart large object.
      - The mi_lo_spec_free() function
        The mi_lo_spec_free() function frees an LO-specification structure.
      - The mi_lo_spec_init() function
        The mi_lo_spec_init() function allocates and initializes the default system storage characteristics that are used to create a smart large object.
      - The mi_lo_specget_def_open_flags() function
        The mi_lo_specget_def_open_flags() function obtains from an LO-specification structure the default open-mode flag for a smart large object.
      - The mi_lo_specget_estbytes() function
        The mi_lo_specget_estbytes() function obtains from an LO-specification structure the estimated size, in bytes, of a smart large object.
      - The mi_lo_specget_extsz() function
        The mi_lo_specget_extsz() function obtains from an LO-specification structure the allocation extent size, in kilobytes, of a smart large object.
      - The mi_lo_specget_flags() function
        The mi_lo_specget_flags() function obtains from an LO-specification structure the attributes flag for a smart large object.
      - The mi_lo_specget_maxbytes() function
        The mi_lo_specget_maxbytes() accessor function obtains the maximum size of a smart large object (in bytes) from an LO-specification structure.
      - The mi_lo_specget_sbspace() function
        The mi_lo_specget_sbspace() function obtains from an LO-specification structure the name of an sbspace where a smart large object is stored.
      - The mi_lo_specset_def_open_flags() function
        The mi_lo_specset_def_open_flags() function sets the default open-mode flag for a smart large object.
      - The mi_lo_specset_estbytes() function
        The mi_lo_specset_estbytes() function sets the estimated size of a smart large object.
      - The mi_lo_specset_extsz() function
        The mi_lo_specset_extsz() function sets the allocation extent size for a smart large object.
      - The mi_lo_specset_flags() function
        The mi_lo_specset_flags() function sets the attributes flag for a smart large object.
      - The mi_lo_specset_maxbytes() function
        The mi_lo_specset_maxbytes() function sets the maximum number of bytes allowed for a smart large object.
      - The mi_lo_specset_sbspace() function
        The mi_lo_specset_sbspace() function sets the sbspace name of a smart large object in an LO-specification structure.
      - The mi_lo_stat() function
        The mi_lo_stat() function puts information about the current status of an open smart large object into an LO-status structure.
      - The mi_lo_stat_atime() function
        The mi_lo_stat_atime() function returns from an LO-status structure the last-access time for a smart large object.
      - The mi_lo_stat_cspec() function
        The mi_lo_stat_cspec() function returns from an LO-status structure the storage characteristics for a smart large object.
      - The mi_lo_stat_ctime() function
        The mi_lo_stat_ctime() function returns from an LO-status structure the last-change time for a smart large object.
      - The mi_lo_stat_free() function
        The mi_lo_stat_free() function frees an LO-status structure.
      - The mi_lo_stat_mtime_sec() function
        The mi_lo_stat_mtime_sec() function returns from an LO-status structure the last-modification time, in seconds, of a smart large object.
      - The mi_lo_stat_mtime_usec() function
        The mi_lo_stat_mtime_usec() function returns from an LO-status structure the microsecond component of the last-modification time for a smart large object.
      - The mi_lo_stat_refcnt() function
        The mi_lo_stat_refcnt() function returns from an LO-status structure the reference count of a smart large object.
      - The mi_lo_stat_size() function
        The mi_lo_stat_size() function obtains from an LO-status structure the size, in bytes, of a smart large object.
      - The mi_lo_stat_uid() function
        The mi_lo_stat_uid() function returns from an LO-status structure the user identifier of the owner of a smart large object.
      - The mi_lo_tell() function
        The mi_lo_tell() function returns the current LO seek position for an open smart large object, relative to the beginning of the smart large object.
      - The mi_lo_to_buffer() function
        The mi_lo_to_buffer() function copies a specified number of bytes from a smart large object to a user-defined buffer.
      - The mi_lo_to_file() function
        The mi_lo_to_file() function copies a smart large object to an operating-system file on the client or server computer.
      - The mi_lo_to_string() function
        The mi_lo_to_string() function converts an LO handle in binary representation to its text representation.
      - The mi_lo_truncate() function
        The mi_lo_truncate() function truncates a smart large object at a specified byte position.
      - The mi_lo_unlock() function
        The mi_lo_unlock() releases a byte-range lock on a smart large object.
      - The mi_lo_utimes() function
        The mi_lo_utimes() function enables you to set the last-access and last-modification time of a smart large object.
      - The mi_lo_validate() function
        The mi_lo_validate() function checks whether a given LO handle is valid.
      - The mi_lo_write() function
        The mi_lo_write() function writes a specified number of bytes to an open smart large object.
      - The mi_lo_writewithseek() function
        The mi_lo_writewithseek() function performs a seek operation and then writes a specified number of bytes of data to an open smart large object.
      - The mi_lock_memory() function
        The mi_lock_memory() function locks and waits for a named-memory mutex specified by name and duration.
      - The mi_lvarchar_to_string() function
        The mi_lvarchar_to_string() function returns the data in a varying-length structure as a null-terminated string.
      - The mi_module_lock() function
        The mi_module_lock() function prevents the shared-object file of the current UDR from being unloaded.
      - The mi_money_to_binary() function
        The mi_money_to_binary() function converts a text (string) representation of a monetary value to its binary (internal) MONEY representation.
      - The mi_money_to_string() function
        The mi_money_to_string() function creates a text (string) representation of a monetary value from the binary (internal) MONEY representation.
      - The mi_named_alloc() function
        The mi_named_alloc() function allocates a named block of memory of the specified size in the specified memory duration.
      - The mi_named_free() function
        The mi_named_free() function frees a block of named memory.
      - The mi_named_get() function
        The mi_named_get() function retrieves the address of a named-memory block.
      - The mi_named_zalloc() function
        The mi_named_zalloc() function allocates and initializes a named-memory block in the specified memory duration.
      - The mi_new_var() function
        The mi_new_var() function creates a new varying-length structure for text data.
      - The mi_next_row() function
        The mi_next_row() function retrieves the next row from the cursor of a query.
      - The mi_open() function
        The mi_open() function establishes a connection to a database server.
      - The mi_open_prepared_statement() function
        The mi_open_prepared_statement() function sends a prepared statement that is a query to the database server for execution and opens a cursor for the retrieved rows of the query.
      - The mi_parameter_count() function
        The mi_parameter_count() function returns the number of input parameters in a prepared statement.
      - The mi_parameter_nullable() function
        The mi_parameter_nullable() function indicates whether the column associated with a specified input parameter in a prepared statement can contain an SQL NULL value.
      - The mi_parameter_precision() function
        The mi_parameter_precision() function obtains the precision of the column associated with the specified input parameter in a prepared statement.
      - The mi_parameter_scale() function
        The mi_parameter_scale() function returns the scale of the column that is associated with a specified input parameter in a prepared statement.
      - The mi_parameter_type_id() function
        The mi_parameter_type_id() function returns the type identifier of the column that is associated with the specified input parameter in a prepared statement.
      - The mi_parameter_type_name() function
        The mi_parameter_type_name() function returns the data type name of the column that is associated with a specified input parameter in a prepared statement.
      - The mi_prepare() function
        The mi_prepare() function sends an SQL statement to the database server to be prepared and returns a statement descriptor for the prepared statement.
      - The mi_process_exec() function
        The mi_process_exec() function forks and executes a new process, returning before this new process completes.
      - The mi_put_bigint() function
        The mi_put_bigint() function copies an mi_bigint (BIGINT) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_bytes() function
        The mi_put_bytes() function copies the given number of bytes, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_date() function
        The mi_put_date() function copies an mi_date (DATE) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_datetime() function
        The mi_put_datetime() function copies an mi_datetime (DATETIME) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_decimal() function
        The mi_put_decimal() function copies an mi_decimal (DECIMAL) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_double_precision() function
        The mi_put_double_precision() function copies an mi_double_precision (FLOAT) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_int8() function
        The mi_put_int8() function copies an mi_int8 (INT8) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_integer() function
        The mi_put_integer() function copies an mi_integer (INTEGER) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_interval() function
        The mi_put_interval() function copies an mi_interval (INTERVAL) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_lo_handle() function
        The mi_put_lo_handle() function copies an LO handle, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_money() function
        The mi_put_money() function copies an mi_money (MONEY) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_real() function
        The mi_put_real() function copies an mi_real (SMALLFLOAT) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_smallint() function
        The mi_put_smallint() function copies an mi_smallint (SMALLINT) value, converting any difference in alignment or byte order on the server computer to that of the client computer.
      - The mi_put_string() function
        The mi_put_string() function copies an mi_string (CHAR(x)) value to a buffer.
      - The mi_query_finish() function
        The mi_query_finish() function finishes execution of the current statement.
      - The mi_query_interrupt() function
        The mi_query_interrupt() function interrupts the current statement.
      - The mi_realloc() function
        The mi_realloc() function reallocates a block of user memory to a specified size and returns a pointer to that block.
      - The mi_register_callback() function
        The mi_register_callback() function registers a callback function for a single event type or for all event types.
      - The mi_result_command_name() function
        The mi_result_command_name() function returns the name of the SQL statement that is the current statement.
      - The mi_result_reference() function
        The mi_result_reference() function returns the reference of the last object inserted on the connection.
      - The mi_result_row_count() function
        The mi_result_row_count() function returns the number of rows affected by the current statement.
      - The mi_retrieve_callback() function
        The mi_retrieve_callback() function retrieves the handle of a registered callback.
      - The mi_routine_end() function
        The mi_routine_end() function releases resources associated with a function descriptor.
      - The mi_routine_exec() function
        The mi_routine_exec() function executes the registered user-defined routine or cast function associated with a specified function descriptor.
      - The mi_routine_get() function
        The mi_routine_get() function looks up a registered user-defined routine by a routine signature that is a character string and creates its function descriptor.
      - The mi_routine_get_by_typeid() function
        The mi_routine_get_by_typeid() function looks up a registered user-defined routine (UDR) on the local database server by a routine signature that the function builds from a list of arguments. This function also creates a function descriptor for the UDR.
      - The mi_routine_id_get() function
        The mi_routine_id_get() accessor function returns the routine identifier for the user-defined routine that the specified function descriptor describes.
      - The mi_row_create() function
        The mi_row_create() function creates a row, based on a row descriptor and column data.
      - The mi_row_desc_create() function
        The mi_row_desc_create() function creates a row descriptor from a specified type identifier.
      - The mi_row_desc_free() function
        The mi_row_desc_free() routine frees a row descriptor.
      - The mi_row_free() function
        The mi_row_free() function frees a row structure.
      - The mi_save_set_count() function
        The mi_save_set_count() function returns the number of rows in a save set.
      - The mi_save_set_create() function
        The mi_save_set_create() function creates a save set on the current connection.
      - The mi_save_set_delete() function
        The mi_save_set_delete() function removes a row from a save set.
      - The mi_save_set_destroy() function
        The mi_save_set_destroy() function destroys a save set and frees its resources.
      - The mi_save_set_get_first() function
        The mi_save_set_get_first() function retrieves the first row from a save set.
      - The mi_save_set_get_last() function
        The mi_save_set_get_last() function retrieves the last row from a save set.
      - The mi_save_set_get_next() function
        The mi_save_set_get_next() function traverses a save set in the forward direction.
      - The mi_save_set_get_previous() function
        The mi_save_set_get_previous() function traverses a save set in the backward direction.
      - The mi_save_set_insert() function
        The mi_save_set_insert() function appends a copy of a row to the end of a save set.
      - The mi_save_set_member() function
        The mi_save_set_member() function determines whether a row is a member of any open save set.
      - The mi_server_connect() function
        The mi_server_connect() function establishes a connection between a client LIBMI application and a database server.
      - The mi_server_library_version() function
        The mi_server_library_version() function returns the name of the database server with its major and minor version numbers.
      - The mi_server_reconnect() function
        The mi_server_reconnect() function re-establishes a dropped connection.
      - The mi_set_connection_user_data() function
        The mi_set_connection_user_data() function associates the address of user data with an open connection.
      - The mi_set_default_connection_info() function
        The mi_set_default_connection_info() function sets the default connection parameters with values from a connection-information descriptor that the user provides.
      - The mi_set_default_database_info() function
        The mi_set_default_database_info() function sets the default database parameters with values from a database-information descriptor that the user provides.
      - The mi_set_large() function
        The mi_set_large() macro sets the threshold-tracking field of a multirepresentational opaque type to indicate that the multirepresentational data is stored in a smart large object.
      - The mi_set_parameter_info() function
        The mi_set_parameter_info() function sets the session parameters with values from a parameter-information descriptor that the user provides.
      - The mi_set_vardata() function
        The mi_set_vardata() accessor routine stores data in the data portion of the data in a varying-length structure (such as mi_lvarchar).
      - The mi_set_vardata_align() function
        The mi_set_vardata_align() accessor routine stores data in the data portion of a varying-length structure (such as mi_lvarchar) and adjusts for any initial padding required to align the data.
      - The mi_set_varlen() function
        The mi_set_varlen() accessor routine sets the length of the data in a varying-length structure (such as mi_lvarchar).
      - The mi_set_varptr() function
        The mi_set_varptr() function sets the data pointer in a varying-length structure (such as mi_lvarchar).
      - The mi_stack_limit() function
        The mi_stack_limit() function checks if the specified amount of space is available on the user stack.
      - The mi_statement_command_name() function
        The mi_statement_command_name() function returns the name of an SQL prepared statement.
      - The mi_stream_clear_eof() function
        The mi_stream_clear_eof() function clears the end-of-file marker for a stream.
      - The mi_stream_close() function
        The mi_stream_close() function closes a stream.
      - The mi_stream_eof() function
        The mi_stream_eof() function determines whether the current stream seek position is at the end of the stream.
      - The mi_stream_get_error() function
        The mi_stream_get_error() function returns the last error status for an open stream and clears the error condition.
      - The mi_stream_getpos() function
        The mi_stream_getpos() function returns the current seek position of an open stream.
      - The mi_stream_init() function
        The mi_stream_init() function initializes a user-defined stream.
      - The mi_stream_length() function
        The mi_stream_length() function obtains the length of an open stream.
      - The mi_stream_open_fio() function
        The mi_stream_open_fio() function opens a new stream on an operating-system file.
      - The mi_stream_open_mi_lvarchar() function
        The mi_stream_open_mi_lvarchar() function opens a new stream on varying-length data.
      - The mi_stream_open_str() function
        The mi_stream_open_str() function opens a new stream on a character string.
      - The mi_stream_read() function
        The mi_stream_read() function reads a specified number of bytes from a stream into a buffer.
      - The mi_stream_seek() function
        The mi_stream_seek() function sets the stream seek position for the next read or write operation on an open stream.
      - The mi_stream_set_eof() function
        The mi_stream_set_eof() function sets the end-of-file marker for a stream.
      - The mi_stream_set_error() function
        The mi_stream_set_error() function sets the last error status for an open stream.
      - The mi_stream_setpos() function
        The mi_stream_setpos() function sets the stream seek position for the next read or write operation on an open stream.
      - The mi_stream_tell() function
        The mi_stream_tell() function returns the current seek position of an open stream, relative to the beginning of the stream.
      - The mi_stream_write() function
        The mi_stream_write() function writes a specified number of bytes to an open stream.
      - The mi_streamread_boolean() function
        The mi_streamread_boolean() function reads an mi_boolean (BOOLEAN) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_collection() function
        The mi_streamread_collection() function reads a collection structure (LIST, SET, MULTISET) from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_date() function
        The mi_streamread_date() function reads an mi_date (DATE) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_datetime() function
        The mi_streamread_datetime() function reads an mi_datetime (DATETIME) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_decimal() function
        The mi_streamread_decimal() function reads an mi_decimal (DECIMAL) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_double() function
        The mi_streamread_double() function reads an mi_double_precision (FLOAT) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_int8() function
        The mi_streamread_int8() function reads an mi_int8 (INT8) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_integer() function
        The mi_streamread_integer() function reads an mi_integer (INTEGER) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_interval() function
        The mi_streamread_interval() function reads an mi_interval (INTERVAL) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_lo() function
        The mi_streamread_lo() function reads smart-large-object data from a stream and copies the data to a smart large object in the default sbspace.
      - The mi_streamread_lo_by_lofd() function
        The mi_streamread_lo_by_lofd() function reads smart-large-object data from a stream and copies the data to the open smart large object that a specified LO file descriptor identifies.
      - The mi_streamread_lvarchar() function
        The mi_streamread_lvarchar() function reads a varying-length structure (mi_lvarchar) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_money() function
        The mi_streamread_money() function reads an mi_money (MONEY) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_real() function
        The mi_streamread_real() function reads an mi_real (SMALLFLOAT) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_row() function
        The mi_streamread_row() function reads a row structure (row type) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_smallint() function
        The mi_streamread_smallint() function reads an mi_smallint (SMALLINT) value from a stream, converting any difference in the stream representation to that of the internal representation.
      - The mi_streamread_string() function
        The mi_streamread_string() function reads an mi_string (CHAR(x)) value from a stream.
      - The mi_streamwrite_boolean() function
        The mi_streamwrite_boolean() function writes an mi_boolean (BOOLEAN) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_collection() function
        The mi_streamwrite_collection() function writes a collection structure (LIST, SET, MULTISET) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_date() function
        The mi_streamwrite_date() function writes an mi_date (DATE) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_datetime() function
        The mi_streamwrite_datetime() function writes an mi_datetime (DATETIME) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_decimal() function
        The mi_streamwrite_decimal() function writes an mi_decimal (DECIMAL) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_double() function
        The mi_streamwrite_double() function writes an mi_double_precision (FLOAT) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_int8() function
        The mi_streamwrite_int8() function writes an mi_int8 (INT8) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_integer() function
        The mi_streamwrite_integer() function writes an mi_integer (INTEGER) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_interval() function
        The mi_streamwrite_interval() function writes an mi_interval (INTERVAL) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_lo() function
        The mi_streamwrite_lo() function writes a smart large object to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_lvarchar() function
        The mi_streamwrite_lvarchar() function writes a varying-length structure (mi_lvarchar) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_money() function
        The mi_streamwrite_money() function writes an mi_money (MONEY) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_real() function
        The mi_streamwrite_real() function writes an mi_real (SMALLFLOAT) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_row() function
        The mi_streamwrite_row() function writes a row structure (row type) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_smallint() function
        The mi_streamwrite_smallint() function writes an mi_smallint (SMALLINT) value to a stream, converting any difference in the internal representation to that of the stream representation.
      - The mi_streamwrite_string() function
        The mi_streamwrite_string() function writes an mi_string (CHAR(x)) value to a stream.
      - The mi_string_to_date() function
        The mi_string_to_date() function converts a text (string) representation of a date value to its binary (internal) DATE representation.
      - The mi_string_to_datetime() function
        The mi_string_to_datetime() function converts a text (string) representation of a date, time, or date and time value to its internal (binary) DATETIME representation.
      - The mi_string_to_decimal() function
        The mi_string_to_decimal() function converts a text (string) representation of a decimal value to its binary (internal) DECIMAL representation.
      - The mi_string_to_interval() function
        The mi_string_to_interval() function converts a text (string) representation of an interval value to its binary (internal) INTERVAL representation.
      - The mi_string_to_lvarchar() function
        The mi_string_to_lvarchar() function converts a null-terminated string to a varying-length structure.
      - The mi_string_to_money() function
        The mi_string_to_money() function converts a text (string) representation of a monetary value to its binary (internal) MONEY representation.
      - The mi_switch_mem_duration() function
        The mi_switch_mem_duration() function switches the current memory duration.
      - The mi_sysname() function
        The mi_sysname() function obtains the name of the default database server.
      - The mi_system() function
        The mi_system() function allows you to execute operating system commands from within a DataBlade® module or C UDR.
      - The mi_td_cast_get() function
        The mi_td_cast_get() function looks up a registered cast function by the type descriptors of its source and target data types and creates its function descriptor.
      - The mi_tracefile_set() function
        The mi_tracefile_set() function sets the trace-output file. The database server writes trace messages to this file.
      - The mi_tracelevel_set() function
        The mi_tracelevel_set() function sets the trace level for specified trace classes.
      - The mi_transaction_state() function (Server)
        The mi_transaction_state() function returns the current transaction state (none, implicit, or explicit).
      - The mi_transition_type() function
        The mi_transition_type() accessor function obtains the type of state transition from a transition descriptor.
      - The mi_trigger_event() function
        The mi_trigger_event() function returns the trigger event information for the current trigger event.
      - The mi_trigger_get_new_row() function
        The mi_trigger_get_new_row() function returns the name of the new row value if the MI_TRIGGER_FOREACH_EVENT bit is set, which implies that neither the MI_TRIGGER_BEFORE_EVENT nor the MI_TRIGGER_AFTER_EVENT bits are set.
      - The mi_trigger_get_old_row() function
        The mi_trigger_get_old_row() function returns the name of the old row value if the MI_TRIGGER_FOREACH_EVENT bit is set, which implies that the MI_TRIGGER_BEFORE_EVENT or the MI_TRIGGER_AFTER_EVENT bits are not set. In addition, mi_trigger_get_old_row() returns all the columns in the requested row, not just those columns into which data was explicitly inserted. Columns with default data are also returned.
      - The mi_trigger_level() function
        The mi_trigger_level() function returns the nesting level value of the current trigger.
      - The mi_trigger_name() function
        The mi_trigger_name() function returns the name of the currently executing trigger.
      - The mi_trigger_tabname() function
        The mi_trigger_tabname() function returns the triggering table or view name on which the current trigger action statement was started.
      - The mi_try_lock_memory() function
        The mi_try_lock_memory() function requests a lock on a named-memory block specified by name and memory duration.
      - The mi_type_align() function
        The mi_type_align() function obtains the alignment for a data type from its type descriptor.
      - The mi_type_byvalue() function
        The mi_type_byvalue() function checks a type descriptor to determine whether a data type is passed by value or by reference.
      - The mi_type_constructor_typedesc() function
        The mi_type_constructor_typedesc() function obtains a type descriptor for a constructed data type.
      - The mi_type_element_typedesc() function
        The mi_type_element_typedesc() function obtains the type descriptor for the elements of a collection data type from its type descriptor.
      - The mi_type_full_name() function
        The mi_type_full_name() function obtains the full name (owner.typename) of a data type from its type descriptor.
      - The mi_type_length() function
        The mi_type_length() function obtains the length of a data type from its type descriptor.
      - The mi_type_maxlength() function
        The mi_type_maxlength() function obtains the maximum length of a data type from its type descriptor.
      - The mi_type_owner() function
        The mi_type_owner() function obtains the owner of a data type from its type descriptor.
      - The mi_type_precision() function
        The mi_type_precision() function obtains the precision of a data type from its type descriptor.
      - The mi_type_qualifier() function
        The mi_type_qualifier() function obtains the qualifier of a data type from its type descriptor.
      - The mi_type_scale() function
        The mi_type_scale() function obtains the scale of the data type from its type descriptor.
      - The mi_type_typedesc() function
        The mi_type_typedesc() function creates a type descriptor, given a type identifier.
      - The mi_type_typename() function
        The mi_type_typename() function obtains the name of a data type from its type descriptor.
      - The mi_typedesc_typeid() function
        The mi_typedesc_typeid() function obtains the type identifier of a data type from its type descriptor.
      - The mi_typeid_equals() function
        The mi_typeid_equals() function determines whether two type identifiers represent the same data type.
      - The mi_typeid_is_builtin() function
        The mi_typeid_is_builtin() function determines whether a type identifier is for a built-in data type.
      - The mi_typeid_is_collection() function
        The mi_typeid_is_collection() function determines whether a type identifier is for a collection.
      - The mi_typeid_is_complex() function
        The mi_typeid_is_complex() function determines whether a type identifier is for a complex data type.
      - The mi_typeid_is_distinct() function
        The mi_typeid_is_distinct() function determines whether a type identifier is for a distinct data type.
      - The mi_typeid_is_list() function
        The mi_typeid_is_list() function determines whether a type identifier is for a LIST collection data type.
      - The mi_typeid_is_multiset() function
        The mi_typeid_is_multiset() function determines whether a type identifier is for a MULTISET collection data type.
      - The mi_typeid_is_row() function
        The mi_typeid_is_row() function determines whether a type identifier is for an SQL row data type.
      - The mi_typeid_is_set() function
        The mi_typeid_is_set() function determines whether a type identifier is for a SET collection data type.
      - The mi_typename_to_id() function
        The mi_typename_to_id() function creates a type identifier for a data type, given the type name in LVARCHAR format.
      - The mi_typename_to_typedesc() function
        The mi_typename_to_typedesc() function creates a type descriptor for a data type, given the type name in LVARCHAR format.
      - The mi_typestring_to_id() function
        The mi_typestring_to_id() function creates a type identifier for a data type, given the type name as a null-terminated string.
      - The mi_typestring_to_typedesc() function
        The mi_typestring_to_typedesc() function creates a type descriptor for a data type, given the type name as a null-terminated string.
      - The mi_udr_lock() function
        The mi_udr_lock() function locks an instance of a UDR onto the virtual processor (VP) on which it begins execution.
      - The mi_unlock_memory() function
        The mi_unlock_memory() function unlocks a named-memory block specified by name and memory duration.
      - The mi_unregister_callback() function
        The mi_unregister_callback() function unregisters a callback for an event type or for all event types.
      - The mi_value() function
        The mi_value() function retrieves a column value from a row, given the column identifier.
      - The mi_value_by_name() function
        The mi_value_by_name() function retrieves a column value from a row, given the column name.
      - The mi_var_copy() function
        The mi_var_copy() function creates a copy of a varying-length structure.
      - The mi_var_free() function
        The mi_var_free() function frees the specified varying-length structure.
      - The mi_var_to_buffer() function
        The mi_var_to_buffer() function copies data from a varying-length structure to a buffer.
      - The mi_version_comparison() function
        The mi_version_comparison() function compares the version of two instances of HCL Informix®.
      - The mi_vpinfo_classid() function
        The mi_vpinfo_classid() function obtains the VP-class identifier for the VP class in which the current UDR is running.
      - The mi_vpinfo_isnoyield() function
        The mi_vpinfo_isnoyield() function determines whether the virtual processor (VP) on which the current UDR is executing is part of a nonyielding user-defined VP class.
      - The mi_vpinfo_vpid() function
        The mi_vpinfo_vpid() function obtains the VP identifier of the virtual processor (VP) on which the user-defined routine (UDR) is executing.
      - The mi_xa_get_current_xid() function
        The mi_xa_get_current_xid() function returns the pointer to the current XID structure for an XA-compliant, external data source. The XID structure is defined in the $INFORMIXDIR/incl/public/xa.h file.
      - The mi_xa_get_xadatasource_rmid() function
        The mi_xa_get_xadatasource_rmid() function gets the resource manager ID that was previously created in the database for an XA-compliant, external data source.
      - The mi_xa_register_xadatasource() function
        The mi_xa_register_xadatasource() function registers an XA data source with the current transaction. The registration is dynamic and is applicable for the current transaction only. The DataBlade® must register participating data sources into each transaction.
      - The mi_xa_unregister_xadatasource() function
        The mi_xa_unregister_xadatasource() function unregisters the previously registered XA data source from the transaction.
      - The mi_yield() function
        The mi_yield() routine yields processing to other database server threads.
      - The mi_zalloc() function
        The mi_zalloc() function allocates and zero-fills a block of memory of the given size and returns a pointer to a block of user memory of the specified size.
      - The rdatestr() function
        The rdatestr() function converts an internal DATE value to a character string.
      - The rdayofweek() function
        The rdayofweek() function returns the day of the week as an integer value for an internal DATE.
      - The rdefmtdate() function
        The rdefmtdate() function uses a formatting mask to convert a character string to an internal DATE format.
      - The rdownshift() function
        The rdownshift() function changes all the uppercase characters within a null-terminated string to lowercase characters.
      - The rfmtdate() function
        The rfmtdate() function uses a formatting mask to convert an internal DATE value to a character string.
      - The rfmtdec() function
        The rfmtdec() function uses a formatting mask to convert a decimal value to a character string.
      - The rfmtdouble() function
        The rfmtdouble() function uses a formatting mask to convert a C double value to a character string.
      - The rfmtlong() function
        The rfmtlong() function uses a formatting mask to convert a C long value to a character string.
      - The rjulmdy() function
        The rjulmdy() function creates an array of three short integer values that represent the month, day, and year from an internal DATE value.
      - The rleapyear() function
        The rleapyear() function returns 1 (TRUE) when the argument that is passed to it is a leap year and 0 (FALSE) when it is not.
      - The rmdyjul() function
        The rmdyjul() function creates an internal DATE from an array of three short integer values that represent month, day, and year.
      - The rstod() function
        The rstod() function converts a null-terminated string into a C double value.
      - The rstoi() function
        The rstoi() function converts a null-terminated string into a short integer value.
      - The rstol() function
        The rstol() function converts a null-terminated string into a long integer value.
      - The rstrdate() function
        The rstrdate() function converts a character string to an internal DATE.
      - The rtoday() function
        The rtoday() function returns the system date as a long integer value.
      - The rupshift() function
        The rupshift() function changes all the characters within a null-terminated string to uppercase characters.
      - The stcat() function
        The stcat() function concatenates one null-terminated string to the end of another.
      - The stchar() function
        The stchar() function stores a null-terminated string in a fixed-length string, padding the end with blanks, if necessary.
      - The stcmpr() function
        The stcmpr() function compares two null-terminated strings.
      - The stcopy() function
        The stcopy() function copies a null-terminated string from one location in memory to another location.
      - The stleng() function
        The stleng() function returns the length, in bytes, of a null-terminated string that you specify.
  - DataBlade® Developers Kit
    The DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade modules, which extend the functionality of HCL Informix® databases.
  - J/Foundation Developer's Guide
    The J/Foundation Developer's Guide describes how to write user-defined routines (UDRs) in the Java™ programming language for Informix®.
  - R-Tree Index User's Guide
    The Informix® R-Tree Index User's Guide describes the HCL Informix R-tree secondary access method and how to access and use its components.
  - User-Defined Routines and Data Types Developer's Guide
    The Informix® User-Defined Routines and Data Types Developer's Guide describes how to define new data types and enable user-defined routines (UDRs) to extend HCL Informix.
  - Virtual-Table Interface Guide
    The Informix® Virtual-Table Interface Programmer's Guide explains how to create a primary access method with the Virtual-Table Interface (VTI) so that users have a single SQL interface to HCL Informix tables and to data that does not conform to the storage scheme of HCL Informix.
  - Virtual-Index Interface Guide
    The Informix® Virtual-Index Interface Programmer's Guide explains how to create a secondary access method with the Virtual-Index Interface (VII) to extend the built-in indexing schemes of HCL Informix typically with a DataBlade® module.

The mi_call_on_vp() function

The mi_call_on_vp() function enables you to switch execution to a specified virtual processor (VP) to execute a specified C function.

Syntax

mi_integer mi_call_on_vp(VP_id, retval, C_func, nargs, argument_list)
   mi_integer VP_id;
   mi_integer *retval;
   mi_integer (*C_func)();
   mi_integer nargs;
   argument_list;

VP_id: The integer VP-class identifier of the VP on which to execute the specified C function. The VP that executes this C function must be a CPU VP or in a user-defined VP class. You cannot execute the C function in some other system VP class.
retval: A pointer to the integer return value of the specified C function.
C_func: A pointer to the executable C function to execute on the specified VP.
nargs: The number of arguments (up to a maximum of 10) to pass to the specified C function.
argument_list: A comma-separated list of value from 0 - 10 arguments to pass to the specified C function.


Valid in client LIBMI application?	Valid in user-defined routine?
No	Yes

Important: This advanced function can adversely affect your UDR if you use the function incorrectly. Use it only when no regular DataBlade® API function can perform the task you need done.

Usage

The mi_call_on_vp() function calls the C function that C_func references on the VP that VP_id identifies. To the specified C function, mi_call_on_vp() passes the number of arguments that nargs specifies. In the mi_call_on_vp() function call, pass the actual argument values as a comma-separated list following the nargs value. When the C function completes execution, mi_call_on_vp() puts its return value in the address that retval references.

The mi_call_on_vp() function takes the following steps:

Switches the current thread to the VP of the specified VP identifier
Executes the C function that the C_func pointer indicates
Returns control to the originating VP

After a successful return, the C_func function has been executed on the specified VP.

The mi_call_on_vp() function does not switch VPs in the following cases:

If the originating VP and specified VP (VP_id) are identical
The mi_call_on_vp() function performs no switching but does not return an error.
If the specified VP (VP_id) is not a CPU VP or user-defined VP
The mi_call_on_vp() function performs no switching and returns an error (MI_ERROR). The message log provides more information about why the switch failed.

For more information about how to switch VPs, see the Informix® DataBlade® API Programmer's Guide.

Return values

MI_DONE: The C_func function was successfully called and its return value is referenced by retval.
MI_TOOMANY: The nargs argument is greater than 10.
MI_ERROR: The function was unable to switch VPs. The online log provides more information about why the switch failed.