事务管理模型（银行转账）

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();
 }
 }
 }
}