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/SysDeptMapper.xml

@@ -57,4 +57,17 @@
         order by d.parent_id, d.order_num
     </select>
 
+    <update id="updateDeptChildren" parameterType="java.util.List">
+        update sys_dept set ancestors =
+        <foreach collection="depts" item="item" index="index"
+                 separator=" " open="case dept_id" close="end">
+            when #{item.deptId} then #{item.ancestors}
+        </foreach>
+        where dept_id in
+        <foreach collection="depts" item="item" index="index"
+                 separator="," open="(" close=")">
+            #{item.deptId}
+        </foreach>
+    </update>
+
 </mapper>