mybatis批量添加，更新，刪除(mapper.xml)

1，批量添加

批量插入數據使用的sql語句是：

insert into table (字段一,字段二,字段三) values(xx,xx,xx),(oo,oo,oo)

 

mapper文件：

int insertBatch(List<TmApplyTemplateDetail> applyTemplateDetailList);

 

mapper.xml文件:

　　<insert id="insertBatch" parameterType="list"> insert into tm_apply_template_detail( template_id,model_id,total_count,remark ) values <foreach collection="list" item="item" separator=","> ( #{templateId},#{modelId},#{totalCount},#{remark} ) </foreach>

    </insert>

 

注意：當然你也可以在Java中寫個循環，然后一條條的去添加，不過這樣頻繁insert執行效率比較低，在項目規模比較小和一次性插入數據不多時可以用。還是建議批量添加。

 

2，批量更新

批量更新SQL：

UPDATE table
    SET aa = CASE id
        WHEN 1 THEN 'oo'
        WHEN 2 THEN 'pp'
        WHEN 3 THEN 'qq'
    END
　 ,SET bb = CASE id
        WHEN 1 THEN 'xx'
        WHEN 2 THEN 'yy'
        WHEN 3 THEN 'zz'
    END
WHERE id IN (1,2,3)

 

mapper.xml文件:

　　　<update id="updateBatch"> update wd_solr set name = <foreach collection="list" item="item" separator=" " open="case id" close="end"> when #{item.id} then #{item.name} </foreach> ,logo = <foreach collection="list" item="item"separator=" " open="case id" close="end"> when #{item.id} then #{item.logo} </foreach> ,timestamp = <foreach collection="list" item="item"separator=" " open="case id" close="end"> when #{item.id} 
　　　　　　　　then #{item.timestamp} </foreach> where id in <foreach collection="list" item="item" separator="," open="(" close=")"> #{item.id} </foreach>
    </update>

 

3,批量刪除

SQL：

delete from table where XX IN(XX,XX,XX)

 

mapper.xml:

　　<delete id="deleteByBatch"> delete from t_enterprise_output_value where output_id IN <foreach collection="array" item="outputId" open="(" separator="," close=")"> #{outputId} </foreach>
    </delete>