Java JDBC事务

JDBC默认是自动提交，事务是关闭的，statement|preparedStatement.executeUpdate()或excute()执行增删改，执行一次就提交一次（自动同步到数据库）。

JDBC事务示例：

 //从properties文件中加载数据库配置
        Properties properties = new Properties();
        InputStream inputStream =Class.forName("test.Test").getResourceAsStream("/mysql.properties");
        properties.load(inputStream);

        String driver = properties.getProperty("driver");
        String url = properties.getProperty("url");
        String user = properties.getProperty("user");
        String pwd=properties.getProperty("password");

        Class.forName(driver);
        Connection connection = DriverManager.getConnection(url, user, pwd);
        connection.setAutoCommit(false);   //关闭自动提交，此句代码会自动开启事务。默认为true，自动提交。

        String sql1 = "insert into student_tb (name,age,score) values (?,?,?)";
        PreparedStatement preparedStatement1 = connection.prepareStatement(sql1);
        preparedStatement1.setString(1,"chy");
        preparedStatement1.setInt(2,20);
        preparedStatement1.setInt(3,100);
        preparedStatement1.executeUpdate();  //放置到队列中

        String sql2 = "update student_tb set name=? where id=?";
        PreparedStatement preparedStatement2 = connection.prepareStatement(sql2);
        preparedStatement2.setString(1,"CoCo");
        preparedStatement2.setInt(2,10);
        preparedStatement2.executeUpdate();  //放置到队列中

        try{
            connection.commit();   //提交事务
        }catch (SQLException e){
            connection.rollback();  //失败就回滚
        } finally {
            preparedStatement1.close();
            preparedStatement2.close();
            connection.close();
        }