mapper

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="cn.bitqian.dao.OrdersMapper"><insert id="insertOrders" parameterType="cn.bitqian.entity.Orders" ><!-- 返回新增后的主鍵值 --><selectKey keyProperty="orderId" resultType="java.lang.Integer" keyColumn="order_id" order="AFTER">SELECT LAST_INSERT_ID()</selectKey>insert into orders values (null, #{orderTime}, #{orderMoney}, #{uid})</insert></mapper>

entity

package cn.bitqian.entity;import java.util.Date;/*** @author echo lovely* @date 2020年11月11日 上午11:30:40*/public class Orders {private Integer orderId;private Date orderTime;private double orderMoney;private int uid;// setter/getter/toString }

dao接口

package cn.bitqian.dao;import cn.bitqian.entity.Orders;/*** 新增orders*/ public interface OrdersMapper {int insertOrders(Orders orders);}

test

@Testpublic void test2() {SqlSession sqlSession = null;try {// 加載mybatis核心配置文件InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");// 獲得session工廠SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);// 通過session工廠獲得sessionsqlSession = sqlSessionFactory.openSession(true);Orders orders = new Orders();orders.setOrderMoney(22);orders.setOrderTime(new Date());orders.setUid(1);OrdersMapper ordersMapper = sqlSession.getMapper(OrdersMapper.class);int count = ordersMapper.insertOrders(orders);System.out.println("受影響行數: " + count);// 主鍵值會自動裝在對象里面System.out.println("新增數據后的主鍵值：" + orders.getOrderId());} catch (Exception e) {System.out.println(e);} finally {if (sqlSession != null) {sqlSession.close();}}}

Oracle/sqlserver
insert結點里面套

<!-- oracle --> <selectKey resultType="java.lang.Integer" keyProperty="id" order="BEFORE">SELECT 序列名.nextval from dual </selectKey> <!-- sql server --> <selectKey resultType="java.lang.Integer" keyProperty="id" order="AFTER">SELECT @@identity </selectKey>

mysql

<selectKey keyProperty="orderId" resultType="java.lang.Integer" keyColumn="order_id" order="AFTER">SELECT LAST_INSERT_ID() </selectKey> 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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