完成了第一版

src/main/resources/mapper/UserInfoMapper.xml

@@ -25,4 +25,26 @@
         userRole,parentUserId,superUserList,
         isDelete,createTime,updateTime
     </sql>
+
+
+
+
+<!--    查询从 userId 一路到根节点的所有 id，按 depth 倒序（根先出）-->
+    <select id="findPathToRoot" resultType="java.lang.Long">
+        WITH RECURSIVE user_path AS (
+            SELECT id, parentUserId, 1 AS depth
+            FROM user_info
+            WHERE id = #{userId}
+
+            UNION ALL
+
+            SELECT u.id, u.parentUserId, up.depth + 1
+            FROM user_info u
+                     JOIN user_path up ON u.id = up.parentUserId
+            WHERE up.depth &lt; 50000
+        )
+        SELECT id
+        FROM user_path
+        ORDER BY depth DESC
+    </select>
 </mapper>