The Connection class provides the following functions:

• Creation of objects in the Statement, PreparedStatement, and CallableStatement classes
• Transaction settlement (COMMIT or ROLLBACK)
• Specification of AUTO commit mode

For details about and usage of each method provided with the Connection class, see the applicable JDBC manual.

(a) Catalog

The JDBC driver does not use a catalog regardless of the connected database type. Therefore, the getCatalog method unconditionally returns the null value, and the setCatalog method does nothing.

(b) Access mode

The JDBC driver does not allow the access mode to be changed. Therefore, the isReadOnly method unconditionally returns false, and the setReadOnly method processes nothing.

(c) Transaction isolation mode

The JDBC driver does not allow the transaction mode to be changed. Therefore, the getTransactionIsolation method unconditionally returns TRANSACTION_READ_COMMITTED, and the setTransactionIsolation method does nothing.