jdbc 开启事务

package com.itheima.tx;

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

import org.junit.Test;

import com.itheima.utils.JdbcUtil;
/**
 * 转账   事务控制
 * update account set money=money-100 where name='aaa';
update account set money=money+100 where name='bbb';
 * @author wangli
 * 
 * 
 * 开事务 
 *       con.setAutoCommit(false);
 * 
 * 提交 
 *       con.commit();
 * 回滚
 *       con.rollback();
 *
 */
public class TransactionDemo1 {
    @Test   
    public void testTransaction(){
        Connection con = null;
        PreparedStatement st =null;
        PreparedStatement st2 = null;
        try {
            con = JdbcUtil.getConnection();
            //设置隔离级别，一定是放在开启事务前
            con.setTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);
            con.setAutoCommit(false);// 放在得到st之前
            st = con.prepareStatement("update account set money=money-100 where name='aaa'");
            st.executeUpdate();
            //int i=1/0;
            st2 = con.prepareStatement("update account set money=money+100 where name='bbb'");
            st2.executeUpdate();
            con.commit();//提交 
        } catch (Exception e) {
            e.printStackTrace();
            if(con!=null){
                try {
                    con.rollback();//回滚
                } catch (SQLException e1) {
                    e1.printStackTrace();
                }
            }
        }finally{
            JdbcUtil.release(null, st, con);
        }
    }
}