Contents Index ODBC handles A first ODBC example

ASA Programming Guide
  ODBC Programming
    ODBC handles

Allocating ODBC handles


The handle types required for ODBC programs are as follows:

Item Handle type
Environment SQLHENV
Connection SQLHDBC
Statement SQLHSTMT
Descriptor SQLHDESC

To use an ODBC handle

  1. Call the SQLAllocHandle function.

    SQLAllocHandle takes the following parameters:

  2. Use the handle in subsequent function calls.

  3. Free the object using SQLFreeHandle.

    SQLFreeHandle takes the following parameters:

Example 

The following code fragment allocates and frees an environment handle:

SQLHENV env;
SQLRETURN retcode;
retcode = SQLAllocHandle( 
      SQL_HANDLE_ENV, 
      SQL_NULL_HANDLE, 
      &env );
if( retcode == SQL_SUCCESS 
    || retcode == SQL_SUCCESS_WITH_INFO ) {
  // success: application code here
}
SQLFreeHandle( SQL_HANDLE_ENV, env );

For more information on return codes and error handling, see Handling errors.


Contents Index ODBC handles A first ODBC example