Question

我试图使用Laravel eloquent在MySQL中获取最后一条消息。我有桌子

chats_users：存储chat_id，user_id
chats_reply：存储chat_id，sender_id，message，created_at

我尝试了下面的代码，但它没有返回最后一条消息。

    return $this->chat->join("chats_users", "chats_users.chat_id", "=", "chats.id")
                      ->join("chats_reply", "chats_reply.chat_id", "=", "chats.id")
                      ->where("chats_users.user_id", "=", $user_id)
                      ->take($limit)
                      ->skip($offset)
                      ->groupBy("chats_reply.chat_id")
                      ->get();

我也尝试过：

return \DB::select( \DB::raw("SELECT * FROM chats_reply msg inner join ( select max(created_at) created_at, message from chats_reply group by chat_id) m2 on msg.created_at = m2.created_at INNER JOIN chats_users mst ON mst.chat_id=msg.chat_id WHERE mst.user_id=$user_id") );

Answer 1

这确实奏效了。

\DB::select( \DB::raw(
            "SELECT * FROM chats_reply msg

             INNER JOIN ( 

                  SELECT max(created_at) created_at FROM chats_reply GROUP BY chat_id ORDER BY created_at

            ) m2 

            ON msg.created_at = m2.created_at
            "
     ) 
  );

会话中的最后一条消息mysql Laravel雄辩

1 个答案: