The ESQL/C API for smart large objects
The Informix® ESQL/C API for smart large objects allows an application program to access a smart large object much like an operating-system file.
A smart large object that does not fit into memory does
not have to be read into a file and then accessed from a file; it
can be accessed one piece at a time. The Informix®
ESQL/C application
program accesses smart large objects through the Informix®
ESQL/C library
functions in the following table.
| ESQL/C function | Description | See |
|---|---|---|
| ifx_lo_alter() | Alters the storage characteristics of an existing smart large object | The ifx_lo_alter() function |
| ifx_lo_close() | Closes an open smart large object | The ifx_lo_close() function |
| ifx_lo_col_info() | Retrieves column-level storage characteristics in an LO-specification structure | The ifx_lo_col_info() function |
| ifx_lo_copy_to_file() | Copies a smart large object into an operating-system file | The ifx_lo_copy_to_file() function |
| ifx_lo_copy_to_lo() | Copies an operating-system file into an open smart large object | The ifx_lo_copy_to_lo() function |
| ifx_lo_create() | Creates an LO-pointer structure for a smart large object | The ifx_lo_create() function |
| ifx_lo_def_create_spec() | Allocates an LO-specification structure and initializes its fields to null values | The ifx_lo_def_create_spec() function |
| ifx_lo_filename() | Returns the generated file name, given an LO-pointer structure and a file specification | The ifx_lo_filename() function |
| ifx_lo_from_buffer() | Copies a specified number of bytes from a user-defined buffer into a smart large object | The ifx_lo_from_buffer() function |
| ifx_lo_open() | Opens an existing smart large object | The ifx_lo_open() function |
| ifx_lo_read() | Reads a specified number of bytes from an open smart large object | The ifx_lo_read() function |
| ifx_lo_readwithseek() | Seeks to a specified position in an open smart large object and reads a specified number of bytes | The ifx_lo_readwithseek() function |
| ifx_lo_release() | Releases resources committed to a temporary smart large object | The ifx_lo_release() function |
| ifx_lo_seek() | Sets the seek position for the next read or write on an open smart large object | The ifx_lo_seek() function |
| ifx_lo_spec_free() | Frees the resources allocated to an LO-specification structure | The ifx_lo_spec_free() function |
| ifx_lo_specget_estbytes() | Gets the estimated size, in bytes, of the smart large object | The ifx_lo_specget_estbytes() function |
| ifx_lo_specget_extsz() | Gets the allocation extent size for the smart large object | The ifx_lo_specget_extsz() function |
| ifx_lo_specget_flags() | Gets the create-time flags for the smart large object | The ifx_lo_specget_flags() function |
| ifx_lo_specget_maxbytes() | Gets the maximum size for the smart large object | The ifx_lo_specget_maxbytes() function |
| ifx_lo_specset_sbspace() | Gets the sbspace name for the smart large object | The ifx_lo_specget_sbspace() function |
| ifx_lo_specset_estbytes() | Sets the estimated size, in bytes, of the smart large object | The ifx_lo_specset_estbytes() function |
| ifx_lo_specset_extsz() | Sets the allocation extent size for the smart large object | The ifx_lo_specset_extsz() function |
| ifx_lo_specset_flags() | Sets the create-time flags for the smart large object | The ifx_lo_specset_flags() function |
| ifx_lo_specset_maxbytes() | Sets the maximum size for the smart large object | The ifx_lo_specset_maxbytes() function |
| ifx_lo_specset_sbspace() | Sets the sbspace name for the smart large object | The ifx_lo_specset_sbspace() function |
| ifx_lo_stat() | Obtains status information for an open smart large object | The ifx_lo_stat() function |
| ifx_lo_stat_atime() | Returns the last access time for a smart large object | The ifx_lo_stat_atime() function |
| ifx_lo_stat_cspec() | Returns the storage characteristics for a smart large object | The ifx_lo_stat_cspec() function |
| ifx_lo_stat_ctime() | Returns the last change-in-status time for the smart large object | The ifx_lo_stat_ctime() function |
| ifx_lo_stat_free() | Frees the resources allocated to an LO-status structure | The ifx_lo_stat_free() function |
| ifx_lo_stat_mtime_sec() | Returns the last modification time, in seconds, for the smart large object | The ifx_lo_stat_mtime_sec() function |
| ifx_lo_stat_refcnt() | Returns the reference count for the smart large object | The ifx_lo_stat_refcnt() function |
| ifx_lo_stat_size() | Returns the size of the smart large object | The ifx_lo_stat_size() function |
| ifx_lo_tell() | Returns the current seek position of an open smart large object | The ifx_lo_tell() function |
| ifx_lo_to_buffer() | Copies a specified number of bytes from a smart large object into a user-defined buffer | The ifx_lo_to_buffer() function |
| ifx_lo_truncate() | Truncates a smart large object to a specific offset | The ifx_lo_truncate() function |
| ifx_lo_write() | Writes a specified number of bytes to an open smart large object | The ifx_lo_write() function |
| ifx_lo_writewithseek() | Seeks to a specified position in an open smart large object and writes a specified number of bytes | The ifx_lo_writewithseek() function |