update 修改框架中批量接口，改为原生mybatis执行foreach，改善性能

ruoyi-system/src/main/resources/mapper/system/SysUserPostMapper.xml

@@ -9,4 +9,11 @@
         <result property="postId" column="post_id"/>
     </resultMap>
 
-</mapper> 
+    <insert id="batchUserPost">
+        insert into sys_user_post(user_id, post_id) values
+        <foreach item="item" index="index" collection="list" separator=",">
+            (#{item.userId},#{item.postId})
+        </foreach>
+    </insert>
+
+</mapper>