事务管理模型（银行转账）

Posted 2022-07-17 newcityboy

package cn.itcast.jdbc;

import cn.itcast.util.JDBCUtils;

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

/**
 * @author newcityman
 * @date 2019/8/15 - 23:39
 * 演示事务
 */
public class JDBCDemo09 
    public static void main(String[] args) 
        Connection conn = null;
        PreparedStatement stmt1=null;
        PreparedStatement stmt2=null;
        try 
//            1、获取连接
            conn = JDBCUtils.getConnection();
//            2、开启事务
            conn.setAutoCommit(false);
            String sql1="update account set balance =balance-? where id=?";
            String sql2="update account set balance =balance+? where id=?";

            stmt1 = conn.prepareStatement(sql1);
            stmt2 = conn.prepareStatement(sql2);

            stmt1.setDouble(1,500);
            stmt1.setInt(2,1);

            stmt2.setDouble(1,500);
            stmt2.setInt(2,2);

            stmt1.executeUpdate();
//            int i=1/0;
            stmt2.executeUpdate();

            conn.commit();
         catch (SQLException e) 
            e.printStackTrace();
            try 
                conn.rollback();
             catch (SQLException e1) 
                e1.printStackTrace();