ASA SQL Reference
  SQL Statements

SET SQLCA statement [ESQL]

Description 

Use this statement to tell the SQL preprocessor to use a SQLCA other than the default, global sqlca.

Syntax 

SET SQLCA sqlca

sqlca :  identifier or string

Usage 

The SET SQLCA statement tells the SQL preprocessor to use a SQLCA other than the default global sqlca. The sqlca must be an identifier or string that is a C language reference to a SQLCA pointer.

The current SQLCA pointer is implicitly passed to the database interface library on every embedded SQL statement. All embedded SQL statements that follow this statement in the C source file will use the new SQLCA.

This statement is necessary only when you are writing code that is reentrant (see SQLCA management for multi-threaded or reentrant code). The sqlca should reference a local variable. Any global or module static variable is subject to being modified by another thread.

Permissions 

None.

Side effects 

None.

See also 

SQLCA management for multi-threaded or reentrant code

Standards and compatibility 

• SQL/92    Vendor extension.

• SQL/99    Vendor extension.

• Sybase    Not supported by Open Client/Open Server.

Example 

The owning function could be found in a Windows DLL. Each application that uses the DLL has its own SQLCA.

an_SQL_code FAR PASCAL ExecuteSQL( an_application *app, char *com )
{
   EXEC SQL BEGIN DECLARE SECTION;
   char *sqlcommand;
   EXEC SQL END DECLARE SECTION;
   EXEC SQL SET SQLCA "&app->.sqlca";
   sqlcommand = com;
   EXEC SQL WHENEVER SQLERROR CONTINUE;
   EXEC SQL EXECUTE IMMEDIATE :sqlcommand;
return( SQLCODE );
}