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SQL Anywhere 12.0.0 (Français) » SQL Anywhere Server - Programming » Embedded SQL


The SQL Communication Area (SQLCA)

The SQL Communication Area (SQLCA) is an area of memory that is used on every database request for communicating statistics and errors from the application to the database server and back to the application. The SQLCA is used as a handle for the application-to-database communication link. It is passed in to all database library functions that need to communicate with the database server. It is implicitly passed on all embedded SQL statements.

A global SQLCA variable is defined in the interface library. The preprocessor generates an external reference for the global SQLCA variable and an external reference for a pointer to it. The external reference is named sqlca and is of type SQLCA. The pointer is named sqlcaptr. The actual global variable is declared in the imports library.

The SQLCA is defined by the sqlca.h header file, included in the SDK\Include subdirectory of your installation directory.

 SQLCA provides error codes

SQLCA fields
SQLCA management for multithreaded or reentrant code
Using multiple SQLCAs