5. Embedded SQL for Ada : The SQL Communications Area : Error Handling Using the SQLCA
 
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Error Handling Using the SQLCA
User-defined error, message and dbevent handlers offer the most flexibility for handling errors, database procedure messages, and database events. For more information, see Advanced Processing in this chapter.
However, you can do error handling with the SQLCA implicitly by using whenever statements, or explicitly by checking the contents of the SQLCA fields sqlcode, sqlerrd, and sqlwarn0.