Transaction savepoints (JDBC 3.0)
by, 11-28-2011 at 07:32 PM (2540 Views)
JDBC 2 provides complete transaction rollback control over transaction. But if you want to rollback to a point, you cannot do so. JDBC 3.0 introduces savepoints which makes this possible.
JDBC 3.0 provides more control over transactions using savepoints. The Savepoint interface allows us to partition a transaction into logical breakpoints. This in turn provides control over how much of the transaction we wish to rolled back.
Lets see how to do this. Review the following example:
Its really an interesting feature. Try it out.Java Code:conn.setAutoCommit(false); // Set a conservative transaction isolation level. conn.setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE); Statement stmt = conn.createStatement(); int rows = stmt.executeUpdate( "INSERT INTO authors " + "(first_name, last_name) VALUES " + "('Lewis', 'Carroll')"); // Set a named savepoint. Savepoint svpt = conn.setSavepoint("NewAuthor"); // ... rows = stmt.executeUpdate( "UPDATE authors set type = 'fiction' " + "WHERE last_name = 'Carroll'"); // ... conn.rollback(svpt); // ... // The author has been added, but not updated. conn.commit();