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();
         }