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How to process ODBC errors (ODBC)

SQL Server 2000

  New Information - SQL Server 2000 SP3.

Two ODBC function calls can be used to retrieve ODBC messages: SQLGetDiagRec and SQLGetDiagField. To obtain primary ODBC-related information in the SQLState, pfNative, and ErrorMessage diagnostic fields, call SQLGetDiagRec until it returns SQL_NO_DATA. For each diagnostic record, SQLGetDiagField can be called to retrieve individual fields. All driver-specific fields must be retrieved using SQLGetDiagField.

SQLGetDiagRec and SQLGetDiagField are processed by ODBC Driver Manager, not an individual driver. ODBC Driver Manager does not cache driver-specific diagnostic fields until a successful connection has been made. Calling SQLGetDiagField for driver-specific diagnostic fields is not possible before a successful connection. This includes the ODBC connection commands, even if they return SQL_SUCCESS_WITH_INFO. Driver-specific diagnostic fields will not be available until the next ODBC function call.

Examples

The example shows a simple error handler that calls SQLGetDiagRec for the standard ODBC information. It then tests for a valid connection, and if there is, it calls SQLGetDiagField for the Microsoft® SQL Server™ ODBC driver-specific diagnostic fields.

The complete sample code is in this file: ProcessODBCErrors.cpp. You can download an archive containing the sample from the SQL Server Downloads page at this Microsoft Web site.

This sample was developed for ODBC version 3.0 or later. It was developed with Microsoft Visual C++® version 6.0, and may expose properties of the Microsoft Foundation Classes.

Security Note  When possible, use Windows Authentication. If Windows Authentication is not available, prompt users to enter their credentials at run time. Avoid storing credentials in a file. If you must persist credentials, you should encrypt them with the Win32 cryptoAPI.

See Also

Handling Errors and Messages

SQLGetDiagField

Diagnostic Records and Fields

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