question: public synchronized int writeToFile ( JDBCSequentialFile file , byte [ ] data ) throws SQLException { try { connection . setAutoCommit ( false ) ; appendToLargeObject . setBytes ( 1 , data ) ; appendToLargeObject . setInt ( 2 , file . getId ( ) ) ; appendToLargeObject . executeUpdate ( ) ; connection . commit ( ) ; return data . length ; } catch ( SQLException e ) { connection . rollback ( ) ; throw e ; } }
target:  Persists data to this files associated database mapping.