讓我們打電話給你的表,User_Types
。
這裏插入樣本數據(5,19,1)如果LIRFU.type = 0
一行語句:
INSERT INTO User_Types (userId, locationId, type)
SELECT @userId:=5, 19, 1 from dual
WHERE (SELECT type FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) = 0;
您可以通過?
替換數據製作成一份準備好的聲明這PHP。
$stmt = $db->prepare("INSERT INTO User_Types (userId, locationId, type) SELECT @userId:=?, ?, 1 from dual WHERE (SELECT type FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) = 0");
$stmt->bind_param('ii', $user_id, $location_id);
//if LIRFU.type = 0
$stmt->execute();
這裏的插入,如果LIRFU.type = 1 AND LIRFU.locationId != 19
與樣本數據的行(5,19,0)聲明:
INSERT INTO User_Types (userId, locationId, type)
SELECT @userId:=5, @locationId:=19, 0 from dual
WHERE (SELECT type FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) = 1
AND (SELECT locationId FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) <> @locationId;
,當它在PHP,準備同樣的想法:
$stmt = $db->prepare("INSERT INTO User_Types (userId, locationId, type) SELECT @userId:=?, @locationId:=?, 0 from dual WHERE (SELECT type FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) = 1 AND (SELECT locationId FROM User_Types WHERE userId = @userId ORDER BY timestamp DESC LIMIT 1) <> @locationId");
$stmt->bind_param('ii', $user_id, $location_id);
//if LIRFU.type = 1 and LIRFU.locationId != $location_id
$stmt->execute();