Home
Extending HCL OneDB™Beyond standard relational database objects, HCL OneDB™ can be extended to handle specialized data types, access methods, routines, and other objects. HCL OneDB™ includes many built-in extensions that are fully integrated in the database server. HCL OneDB™ 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 HCL OneDB™.
Creating extensionsYou 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 HCL OneDB™ databases.
DataBlade® API Function ReferenceThe HCL OneDB™ DataBlade® API Function Reference describes the DataBlade® API functions and the subset of functions that the DataBlade® API supports.
Function descriptionsThis 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_last_serial() functionThe 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_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.

Syntax

mi_integer mi_last_serial(conn, serial_val)
   MI_CONNECTION *conn;
   mi_integer *serial_val;

conn: A pointer to a connection descriptor established by a previous call to mi_open(), mi_server_connect(), or mi_server_reconnect().
serial_val: A pointer to the new SERIAL value to obtain.


Valid in client LIBMI application?	Valid in user-defined routine?
Yes	Yes

Usage

The database server automatically generates a value for a SERIAL column when it executes an INSERT statement on the column.

Server only: Use the mi_last_serial() function to obtain the last system-generated SERIAL value for your C user-defined routine.

Client only: To use the mi_last_serial() function in a client LIBMI application, call it after the insert operation is complete (when the mi_get_result() function returns the MI_DML statement).

You must also call mi_last_serial() before any call to mi_query_finish() or mi_close().

Return values

MI_OK: The function was successful.
MI_ERROR: The function was not successful.