mybatis批量添加，更新，删除(mapper.xml)

1，批量添加

批量插入数据使用的sql语句是：

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：当然你也可以在Java中写个循环，然后一条条的去添加，不过这样频繁insert执行效率比较低，在项目规模比较小和一次性插入数据不多时可以用。还是建议批量添加。

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,批量删除

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>