jdbc mysql 事务处理

一、请使用jdbc技术实现数据库连接，并且保证在一个事务中对表TEST的一条记录做修改（并保证连接正常关闭），例如：
[TEST]
ID NAME
1  test
2  test1
修改为
[TEST]
ID NAME 
1  test2
2  test1

二、请根据上题的继续实现：遍历所有数据库记录，遇到ID=1的记录时，NAME修改为test3后立即提交事务，遇到的ID=2的记录时，先将NAME修改为test4后立即回滚事务将ID=2的记录NAME回复为原值（并保证连接正常关闭）。

 

代码如下,如有更好的实现，请大家贴出来共同学习.

 

package com.jdbc.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class MYSQLConn {

 public static void main(String[] args) {

  Connection con = null;
        PreparedStatement pstm = null;
        ResultSet rs = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection(
              "jdbc:mysql://localhost:3306/myuser?useUnicode=true&characterEncoding=UTF-8"
              ,"root","123456");
            System.out.println(con);
           
            /*//新增记录
            String insertSQL = "insert into user_info() values (2,'test1',12)";
            pstm = con.prepareStatement(insertSQL);
            pstm.executeUpdate();*/
           
            /*//一
            con.setAutoCommit(false);
            String updateSQL = "update user_info set name='" + "test2" + "' where id=1";
            pstm = con.prepareStatement(updateSQL);
            pstm.executeUpdate();
            con.rollback();
            con.commit();
            con.setAutoCommit(true);*/
           
            //二
            String sql = "select * from user_info";
            pstm = con.prepareStatement(sql);
            rs = pstm.executeQuery();
            while(rs.next())
            {
                int ID = rs.getInt("id");
                if (ID == 1) {
                 con.setAutoCommit(false);
                    String updateSQL = "update user_info set name='" + "test3" + "' where id=1";
                    pstm = con.prepareStatement(updateSQL);
                    pstm.executeUpdate();
//                    con.rollback();
                    con.commit();
                    con.setAutoCommit(true);
                } else if (ID == 2) {
                 con.setAutoCommit(false);
                    String updateSQL = "update user_info set name='" + "test4" + "' where id=2";
                    pstm = con.prepareStatement(updateSQL);
                    pstm.executeUpdate();
                    con.rollback();
                    con.commit();
                    con.setAutoCommit(true);
                }
                System.out.print(ID + "  ");
               

            }

        } catch (Exception e) {
            e.printStackTrace();
            // TODO: handle exception
        } finally {
         try {
    con.close();
   } catch (SQLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
        }
        System.out.println(con);
  
 }

}