Mybatis批量操作

1、批量插入

 <!--批量操作-插入-->
    <!-- 相当于
    INSERT INTO t_goods (c1,c2,c3) VALUES (a1,a2,a3),(b1,b2,b3),(d1,d2,d3),...
    -->
    <insert id="batchInsert" parameterType="java.util.List">
        INSERT INTO t_goods (title,sub_title,original_cost,current_price,discount,is_free_delivery,category_id) VALUES
          <foreach collection="list" item="item" index="index" separator=",">
              (#{item.title},#{item.subTitle},#{item.originalCost},#{item.currentPrice},#{item.discount},#{item.isFreeDelivery},#{item.categoryId})
          </foreach>
    </insert>

测试

 @Test
    public void batchInsertTest(){
        SqlSession sqlSession = null;
        try {
            sqlSession = MyBatisUtil.getSqlSession();
            PageHelper.startPage(1, 6);
            GoodsMapper mapper = sqlSession.getMapper(GoodsMapper.class);
            List<Goods> goodsList = new ArrayList<Goods>();
            for (int i = 0; i < 10; i++) {
                Goods goods = new Goods();
                goods.setTitle("测试产品"+i);
                goods.setSubTitle("测试产品副标题"+i);
                goods.setDiscount(0.88f);
                goods.setIsFreeDelivery(1);
                goods.setOriginalCost(155f);
                goods.setCategoryId(40);
                goods.setCurrentPrice(888f);
                goodsList.add(goods);
            }
            int insert = mapper.batchInsert(goodsList);
            if (insert == goodsList.size()) {
                sqlSession.commit();
                System.out.println("插入数据成功");
            }else{
                System.out.println("插入数据失败");
                sqlSession.rollback();
            }

        } catch (Exception e) {
            System.out.println("插入数据失败");
            sqlSession.rollback();
            throw new RuntimeException(e);
        } finally {
            sqlSession.close();
        }
    }

1、批量插入数据无法获得插入数据的id,若后续需要使用该id继续操作，需要想别的办法
2、若批量插入的数据太多，生成的批量插入SQL过长，可能会被服务器拒绝，可以改为分成几次来完成

2、批量删除

<!--批量操作-删除-->
<!--相当于
 DELETE FROM t_goods WHERE goods_id IN (a1,a2,a3,a4,a5...)
-->
<delete id="batchDelete" parameterType="java.util.List">
    DELETE FROM t_goods WHERE goods_id IN
    <foreach collection="list" item="item" index="index" separator=","  open="(" close=")">
        #{item}
    </foreach>
</delete>

测试：

@Test
    public void batchDeleteTest(){
        SqlSession sqlSession = null;
        try {
            sqlSession=MyBatisUtil.getSqlSession();
            GoodsMapper mapper = sqlSession.getMapper(GoodsMapper.class);
            List<Integer> parameterList = Arrays.asList(2600, 2601,2602);
            int delete = mapper.batchDelete(parameterList);
            if (delete == parameterList.size()) {
                System.out.println("删除数据成功");
                sqlSession.commit();
            }else{
                System.out.println("删除数据失败");
                sqlSession.rollback();
            }
        } catch (Exception e) {
            System.out.println("删除数据失败");
            sqlSession.rollback();
            throw new RuntimeException(e);
        } finally {
            sqlSession.close();
        }
    }