JDBC Transaction Rollback Tutorial

To roll back a transaction in JDBC, you can use the rollback() method of the Connection object. The specific steps are as follows:

1. Firstly, make sure to set the auto commit to false when creating the Connection object, like connection.setAutoCommit(false).
2. Before executing the SQL statement, it is necessary to start a transaction, which can be done by using connection.setAutoCommit(false) to disable auto-commit.
3. When an exception occurs or a transaction needs to be rolled back, call the connection.rollback() method to rollback.
4. You can call the connection.commit() method if you need to manually submit the transaction.
5. Lastly, remember to call connection.setAutoCommit(true) to set auto-commit back to true before closing the Connection object.

Here is an example code:

// 创建Connection对象
Connection connection = DriverManager.getConnection(url, username, password);

// 关闭自动提交
connection.setAutoCommit(false);

// 开启事务
try {
    // 执行SQL语句
    // 如果出现异常，可以调用connection.rollback()进行回滚
    // connection.rollback();

    // 提交事务
    connection.commit();
} catch (SQLException e) {
    // 出现异常时回滚事务
    connection.rollback();
    e.printStackTrace();
} finally {
    // 关闭Connection对象时，将自动提交设置回true
    connection.setAutoCommit(true);
    connection.close();
}