1.Mybatis数据写操作操作

 2.步骤

2.1 在good.xml中添加SQL语句

   <insert id="insert" parameterType="com.imooc.mybatis.entity.Goods" >
        INSERT INTO t_goods(title, sub_title, original_cost, current_price, discount, is_free_delivery, category_id)
        VALUES (#{title} , #{subTitle} , #{originalCost}, #{currentPrice}, #{discount}, #{isFreeDelivery}, #{categoryId})
        <!--<selectKey resultType="Integer" keyProperty="goodsId" order="AFTER">-->
        <!--select last_insert_id()-->
        <!--</selectKey>-->
    </insert>

2.2 在MybatisTest.java中添加测试代码

 /**
     * 新增数据
     * @throws Exception
     */
    @Test
    public void testInsert() throws Exception {
        SqlSession session = null;
        try{
            session = MyBatisUtils.openSession();
            Goods goods = new Goods();
            goods.setTitle("测试商品");
            goods.setSubTitle("测试子标题");
            goods.setOriginalCost(200f);
            goods.setCurrentPrice(100f);
            goods.setDiscount(0.5f);
            goods.setIsFreeDelivery(1);
            goods.setCategoryId(43);
            //insert()方法返回值代表本次成功插入的记录总数
            int num = session.insert("goods.insert", goods);
            session.commit();//提交事务数据
            System.out.println(goods.getGoodsId());
        }catch (Exception e){
            if(session != null){
                session.rollback();//回滚事务
            }
            throw e;
        }finally {
            MyBatisUtils.closeSession(session);
        }
    }

2.2.1  如何在插入成功后获得自动生成的主键（主键回填）

    <insert id="insert" parameterType="com.imooc.mybatis.entity.Goods" >
        <!--不用添加主键，主键是自动生成的编号-->
        INSERT INTO t_goods(title, sub_title, original_cost, current_price, discount, is_free_delivery, category_id)
        VALUES (#{title} , #{subTitle} , #{originalCost}, #{currentPrice}, #{discount}, #{isFreeDelivery}, #{categoryId})
        <selectKey resultType="Integer" keyProperty="goodsId" order="AFTER">
        select last_insert_id()
        </selectKey>
    </insert>

3.insert 的几个属性说明