PDO_ERR_CONSTRAINT 1496 ext/pdo/pdo_dbh.c 	REGISTER_PDO_CLASS_CONST_LONG("ERR_CONSTRAINT", 	(long)PDO_ERR_CONSTRAINT);
PDO_ERR_CONSTRAINT   62 ext/pdo_firebird/firebird_driver.c 			*error_code = PDO_ERR_CONSTRAINT;