perf: mysql递归查询兼容处理

app/index/controller/TopicNas.php

@@ -274,17 +274,33 @@ class TopicNas extends Common
             ->value('id');
             
         // 获取帮且中心分类子分类
+        $categorys  = [];
         $table_name = (new ArticleCategoryModel)->getTable();
-        $categorys = \think\facade\Db::query(preg_replace(
-            '/\s+/u', 
-            ' ',
-            "WITH RECURSIVE article_tree_by AS (
-                SELECT a.id, a.pid FROM $table_name a WHERE a.id = {$parent}
-                UNION ALL
-                SELECT k.id, k.pid FROM $table_name k INNER JOIN article_tree_by t ON t.id = k.pid
-            )
-            SELECT id FROM article_tree_by WHERE id <> {$parent}"
-        ));
+        if (env('DB_VERSION', '5') == '8') {
+            $categorys = \think\facade\Db::query(preg_replace(
+                '/\s+/u', 
+                ' ',
+                "WITH RECURSIVE article_tree_by AS (
+                    SELECT a.id, a.pid FROM $table_name a WHERE a.id = {$parent}
+                    UNION ALL
+                    SELECT k.id, k.pid FROM $table_name k INNER JOIN article_tree_by t ON t.id = k.pid
+                )
+                SELECT id FROM article_tree_by WHERE id <> {$parent}"
+            ));
+        } else {
+            $categorys = \think\facade\Db::query("
+                SELECT t2.id
+                    FROM ( 
+                        SELECT 
+                            @r AS _id, (SELECT @r := GROUP_CONCAT(id) FROM $table_name WHERE FIND_IN_SET(pid, _id)) AS parent_id
+                        FROM 
+                            (SELECT @r := $parent) vars, $table_name h 
+                        WHERE @r <> 0) t1 
+                    JOIN $table_name t2 
+                    ON FIND_IN_SET(t2.pid, t1._id)
+                ORDER BY t2.id;
+            ");
+        }
         if (empty($categorys)) return success('success', []);
 
         // 获取文章数据