Three methods are associated with the BitmapObject and StringObject system classes that interact directly with the database:

Two methods are associated with the LongByteObject and LongVCharObject system classes that interact directly with the database:

Four methods are defined by the DataStream system class:

Three additional methods are defined for the QueryObject subclass:

If no transaction is open when one of these methods is executed, its execution initiates a transaction. If a transaction is open, then the work performed by the method becomes part of the transaction.

Like any other work performed by a database statement, the work is not committed to the database until the transaction of which it is a part is committed. If the program issues a rollback statement, any work performed by one of these methods in the affected transaction is also undone.

Similarly, if you set the DBHandle attribute of either a bitmap or StringObject object, you access the database. Setting the DBHandle can initiate a transaction, and commit and rollback statements affect the statements that set a DBHandle attribute.

For more information about setting a DBHandle directly, see How You Can Use the ErrorStatus Attribute. For more information about detecting and handling DBMS errors in DataStream objects, see How You Can Handle DataStream Errors.