解决DB类查询数据拿不到结果的问题

app/Models/Permission.php

@@ -48,19 +48,30 @@ class Permission extends Model
     public function ModifyRole(string $adminUid, string $uid, string $rights)
     {
         // Verify that the current user has permission to modify permissions
-        $data = DB::select("select uid, role from permission where uid = ? and is_del = false and status = ? and role & ? > 0;", [$adminUid, "normal", SUPER_ADMIN | SYSTEM_ADMIN]);
-        log::debug($data);
+        $rows = DB::select("select uid, role from permission where uid = ? and is_del = false and status = ? and role & ? > 0;", [$adminUid, "normal", SUPER_ADMIN | SYSTEM_ADMIN]);
+        if (!$rows) {
+            log::debug("ModifyRole with adminUid: " . $adminUid . ", uid: " . $uid . ", rights: " . $rights . " but permission denied");
+            return "permission denied";
+        }
+
+        $data = null;
+        foreach ($rows as $d){
+            $data = $d;
+            break;
+        }
+
         if (!$data) {
             log::debug("ModifyRole with adminUid: " . $adminUid . ", uid: " . $uid . ", rights: " . $rights . " but permission denied");
             return "permission denied";
         }
+
         if ($data->uid < 1) {
             log::debug("ModifyRole with adminUid: " . $adminUid . ", uid: " . $uid . ", rights: " . $rights . " but invalid admin uid: " . $adminUid);
             return "invalid admin uid: " . $adminUid;
         }
 
-        if ($data->right >= $rights) {
-            log::debug("ModifyRole with adminUid: " . $adminUid . ", admin role: ". $data->role . ", uid: " . $uid . ", rights: " . $rights . " but have no permission to grant higher rights");
+        if ($data->role >= $rights) {
+            log::debug("ModifyRole with adminUid: " . $adminUid . ", admin role: ". $data->uid . ", uid: " . $uid . ", rights: " . $rights . " but have no permission to grant higher rights");
             return "have no permission to grant higher rights";
         }