正确处理ON DELETE CASCADE

EdgeManager/EController/EConfigure.php

@@ -50,30 +50,13 @@ class EConfigure {
     }
 
     function remove_server() {
-        pg_query($this -> dbconn, "BEGIN");
-        $exists = pg_query($this -> dbconn, sprintf(
-            "SELECT EXISTS(
-                SELECT 1 FROM hf_mes_scada_edgeserver_controller_device
-                WHERE server_id = '%s'
-            )", $this -> post -> id
-        ));
-        if (pg_fetch_assoc($exists)['exists'] === 't') {
-            pg_query($this -> dbconn, "ROLLBACK");
-            return "REMAINING";
-        } else {
-            $res = pg_delete(
-                $this -> dbconn,
-                'hf_mes_scada_edgeserver_controller_server',
-                (array) $this -> post,
-            );
-            if ($res) {
-                pg_query($this -> dbconn, "COMMIT");
-                return true;
-            } else {
-                pg_query($this -> dbconn, "ROLLBACK");
-                return false;
-            }
-        }
+        $res = pg_delete(
+            $this -> dbconn,
+            'hf_mes_scada_edgeserver_controller_server',
+            (array) $this -> post,
+        );
+
+        return $res ? true : "REMAINING";
     }
     
     function update_server() {