【mybatis】mybatis中批量插入 批量更新 batch 进行insert 和 update，或者切割LIst进行批量操作

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分别展示 mybatis 批量新增  和 批量更新   的操作：

controller层：

goodsService.batchInsert(insertGoodsList);

goodsService.batchUpdate(updateGoodsList);

service层：

切割List的方法【https://www.cnblogs.com/sxdcgaq8080/p/9376947.html】【建议分批次处理，每次处理1000条】【实际根据每条数据的大小，自行划分】

　　@Override
    @Transactional
    public int batchInsert(List<Goods> list) {
        int a = 0;

        List<List<Goods>> goodsAllList = ListUtils.splitListBycapacity(list,1000);
        for (List<Goods> goodsList : goodsAllList) {
            a += mapper.batchInsert(goodsList);
        }

        return a;
    }

    @Override
    @Transactional
    public int batchUpdate(List<Goods> list) {
        int a = 0;

        List<List<Goods>> goodsAllList = ListUtils.splitListBycapacity(list,1000);
        Map<String,Object> map = new HashMap<>();
        for (List<Goods> goodsList : goodsAllList) {
            map.put("list",goodsList);
            a += mapper.batchUpdate(map);
        }

        return a;
    }

Mapper.java层

    int batchInsert(List<Goods> list);

    int batchUpdate(Map<String,Object> map);

Mapper.xml层

【注意，batchUpdate的原理，是循环拼接sql,一次连接数据库，执行多条update语句】

<insert id="batchInsert">
        INSERT INTO goods

        (create_date,update_date,create_id,update_id,enabled,
        tenement_id,uid,name,py_all,py_head,
        outer_id,outer_code,mnemonic_code,del_flag,enabled_flag,
        goods_type_uid,url,bar_cide,sale_price,integral,
        scan_name,brand_uid,en_name)

        VALUES

        <foreach collection="list" item="item" separator=",">
            (#{item.createDate},#{item.updateDate},#{item.createId},#{item.updateId},#{item.enabled},
            #{item.tenementId},#{item.uid},#{item.name},#{item.pyAll},#{item.pyHead},
            #{item.outerId},#{item.outerCode},#{item.mnemonicCode},#{item.delFlag},#{item.enabledFlag},
            #{item.goodsTypeUid},#{item.url},#{item.barCide},#{item.salePrice},#{item.integral},
            #{item.scanName},#{item.brandUid},#{item.enName})
        </foreach>
    </insert>

    <update id="batchUpdate" parameterType="java.util.Map">
        <foreach collection="list" separator=";" item="goods">
            update
                goods 
            SET
                update_date = #{goods.updateDate},
                update_id = #{goods.updateId},
                enabled = #{goods.enabled},
                name = #{goods.name},
                py_all = #{goods.pyAll},
                py_head = #{goods.pyHead},
                outer_code = #{goods.outerCode},
                mnemonic_code = #{goods.mnemonicCode},
                del_flag = #{goods.delFlag},
                enabled_flag = #{goods.enabledFlag},
                goods_type_uid = #{goods.goodsTypeUid},
                url = #{goods.url},
                bar_cide = #{goods.barCide},
                sale_price = #{goods.salePrice},
                integral = #{goods.integral},
                scan_name = #{goods.scanName},
                brand_uid = #{goods.brandUid},
                en_name = #{goods.enName}
            where
                outer_id = #{goods.outerId}
            and
                tenement_id = #{goods.tenementId}

        </foreach>
    </update>

最后如果，批量插入可以成功，但是批量更新失败，可以参考：https://www.cnblogs.com/sxdcgaq8080/p/10565023.html

最后需要注意的是，如果解决了批量更新问题后，还想按照【https://www.cnblogs.com/sxdcgaq8080/p/9100178.html】打印sql，就失效了，sql就不会打印出来了。！！！！

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