如何將此查詢轉換爲Laravel Query Builder？

Question

我不知道的內部SQL中time_diff方法：

SELECT t1.started_at as chain_break, 
time_to_sec(timediff(t1.started_at,IFNULL(
              (SELECT MAX(t2.ended_at) 
              FROM status_records t2 
              WHERE t2.user_id=189 
              AND t2.started_at< t1.started_at 
             ), t1.started_at 
             ) 
         ) 
       )/3600 AS time_off 
FROM status_records t1 
WHERE t1.user_id=189 
ORDER BY t1.ended_at DESC 
LIMIT 6 

有沒有一個很好的辦法做到這一點，除了把這個查詢在DB::query爲原料SQL？

Answer 1

是的，您可以使用selectRaw()將您的子查詢添加爲字段選擇。要創建子查詢，您可以創建另一個查詢生成器。

Answer 2

嘗試這個

DB::raw("SELECT t1.started_at as chain_break, 
time_to_sec(timediff(t1.started_at,IFNULL(
              (SELECT MAX(t2.ended_at) 
              FROM status_records t2 
              WHERE t2.user_id=189 
              AND t2.started_at< t1.started_at 
             ), t1.started_at 
             ) 
         ) 
       )/3600 AS time_off 
FROM status_records t1 
WHERE t1.user_id=189 
ORDER BY t1.ended_at DESC 
LIMIT 6");