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The SQLSTATE variable returns the code corresponding to the last SQL error.
SQLSTATE
The SQLSTATE predefined variable returns the ANSI/ISO SQLSTATE code when an SQL error occurred.
The SQLSTATE error code is a standard ANSI specification, but not all database engines support this feature. Check the database server documentation for more details.
The variable is NULL if the last SQL statement was successfull.
MAIN DATABASE stores WHENEVER ERROR CONTINUE SELECT foo FROM bar DISPLAY SQLSTATE END MAIN