Mybatis批量修改联合主键数据

最近遇上需要批量修改有联合主键的表数据，网上找了很多文章，最终都没找到比较合适的方法，有些只能支持少量数据批量修改，超过十几条就不行了。

最终自己摸索总结了两种方式可以批量修改数据。

第一种：

 <update id="updateMoreEmpOrg" parameterType="java.util.List">
        update hr_emp_org
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="ISMAN = CASE EMPID" suffix="end,">
                <foreach collection="empOrgList" item="item" index="index">
                    <if test="item.isman != null">
                        when EMPID = #{item.empid} then #{item.isman}
                    </if>
                </foreach>
            </trim>
            <trim prefix="UPDATETIME = CASE EMPID" suffix="end,">
                <foreach collection="empOrgList" item="item" index="index">
                    <if test="item.updatetime != null">
                        when EMPID = #{item.empid} then #{item.updatetime}
                    </if>
                </foreach>
            </trim>

            <trim prefix="hr_status =case EMPID" suffix="end,">
                <foreach collection="empOrgList" item="item" index="index">
                    <if test="item.hrStatus != null">
                        when #{item.EMPID} then #{item.hrStatus}
                    </if>
                </foreach>
            </trim>
        </trim>
        where
        EMPID in
        <foreach collection="empOrgList" item="item" open="(" separator="," close=")">
            #{item.empid}
        </foreach>
        and ORGID in
        <foreach collection="empOrgList" item="item" open="(" separator="," close=")">
            #{item.orgid}
        </foreach>
    </update>

直接结果集来两个in查询，最终可以满足。

第二种：

 <update id="updateMoreEmpPosition" parameterType="java.util.List">
        update hr_emp_position
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="ISMAN =case" suffix="end,">
                <foreach collection="empPositionList" item="item" index="index">
                    <if test="item.isman != null">
                        when EMPID = #{item.empid} and POSITIONID = #{item.positionid} then #{item.isman}
                    </if>
                </foreach>
            </trim>
            <trim prefix="CREATETIME =case" suffix="end,">
                <foreach collection="empPositionList" item="item" index="index">
                    <if test="item.createtime != null">
                        when EMPID = #{item.empid} and POSITIONID = #{item.positionid} then #{item.createtime}
                    </if>
                </foreach>
            </trim>
            <trim prefix="UPDATETIME =case" suffix="end,">
                <foreach collection="empPositionList" item="item" index="index">
                    <if test="item.updatetime != null">
                        when EMPID = #{item.empid} and POSITIONID = #{item.positionid} then #{item.updatetime}
                    </if>
                </foreach>
            </trim>
            <trim prefix="hr_status =case" suffix="end,">
                <foreach collection="empPositionList" item="item" index="index">
                    <if test="item.hrStatus != null">
                        when EMPID = #{item.empid} and POSITIONID = #{item.positionid} then #{item.hrStatus}
                    </if>
                </foreach>
            </trim>
        </trim>
        where
        EMPID in
        <foreach collection="empPositionList" item="item" open="(" separator="," close=")">
            #{item.empid}
        </foreach>
    </update>

修改条件中trim里面 case后面不填对比字段，在if里面进行对比判断。