Java JDBC程序中对于数据库事务的处理详解

//演示jdbc 中如何使用事务
public class Transaction_ {
    //没有使用事务
    @Test
    public void noTransaction() {
        //1.得到连接
        Connection connection = null;
        //2.组织一个sql
        //更新记录
        String sql = "UPDATE ACCOUNT SET balance=balance-100 WHERE id=1";
        String sql2 = "UPDATE ACCOUNT SET balance=balance+100 WHERE id=2";
        PreparedStatement preparedStatement = null;
        //创建PrepareStatement对象
        try {
            connection = JDBCUtils.getConnection(); //在默认情况下，connection对象是默认自动提交的
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.executeUpdate();
            int i = 1 / 0;
            preparedStatement = connection.prepareStatement(sql2);
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //关闭资源
            JDBCUtils.close(null, preparedStatement, connection);
        }
    }
  //使用事务
    @Test
    public void useTransaction() {
        //1.得到连接
        Connection connection = null;
        //2.组织一个sql
        //更新记录
        String sql = "UPDATE ACCOUNT SET balance=balance-100 WHERE id=1";
        String sql2 = "UPDATE ACCOUNT SET balance=balance+100 WHERE id=2";
        PreparedStatement preparedStatement = null;
        //创建PrepareStatement对象
        try {
            connection = JDBCUtils.getConnection(); //在默认情况下，connection对象是默认自动提交的
            //将connection 设置为不自动提交
            connection.setAutoCommit(false);//开启事务
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.executeUpdate();
//            int i = 1 / 0;
            preparedStatement = connection.prepareStatement(sql2);
            preparedStatement.executeUpdate();
            //这里提交事务
            connection.commit();
        } catch (SQLException e) {
            //这里我们可以进行回滚，即撤销执行的sql
            //默认回滚到事务开始的状态
            try {
                connection.rollback();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
            e.printStackTrace();
        } finally {
            //关闭资源
            JDBCUtils.close(null, preparedStatement, connection);
        }
    }
}