Fix unique index exception handling for an index on multiple columns in PHP 5.4 #771
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In SQLite under PHP 5.4, when I violate a unique index on multiple columns by creating a duplicate record, the PDO Exception thrown is "SQLSTATE[23000]: Integrity constraint violation: 19 columns X, Y are not unique". This PDO exception message is not parsed by the AbstractSQLiteDriver and converted to a UniqueConstraintViolationException as expected, and as happens in PHP 5.5, so only a generic DriverException is thrown, making error handling much harder.
This pull request adds "are not unique" as a string that is checked for in the exception handling code.