The methods support the following types of SQL statements:
You can perform updates only when your Data object is connected to a the data source that corresponds to the SQL statement.
The overloading of the update() method allows you optionally to request information regarding auto-generated columns. When you request this information, you can perform only single-row forms of the types of SQL statements that your database driver supports for auto-generated columns. For example, the IBM® Data Server Driver for JDBC and SQLJ supports the return of keys auto-generated only from INSERT statements.