我可以在mysql select语句中使用Php函数吗？

Question

我想通过使用getCity（）函数来获得cit名称，但不幸的是它不适用于我。请帮忙。

$sql =(" 
    SELECT 
     distinct orders.id as 'Order Id', 
     users.email, 
     orders.price as 'Amount', 
     orders.at as 'Date and Time', 
     '".getCity($id)."' as 'CITY' 
    FROM users, orders, order_history, users_address 
    WHERE 
     users.id = order_history.uid 
     AND orders.id = order_history.oid 
     AND orders.real = 1 AND orders.price > 1 
     AND orders.payment_status = 1 AND orders.status = 1 
    ORDER BY orders.id; 
"); 

Answer 1

您只能使用此功能的结果是：

$result = getCity($id); 

$sql =(" 
    SELECT 
     distinct orders.id as 'Order Id', 
     users.email, orders.price as 'Amount', 
     orders.at as 'Date and Time', 
     '$result' as 'CITY' 
    FROM users, orders, order_history, users_address 
    WHERE users.id = order_history.uid 
     AND orders.id= order_history.oid 
     AND orders.real = 1 AND orders.price > 1 
     AND orders.payment_status = 1 AND orders.status = 1 
    order by orders.id; 
"); 

在这种情况下$result只能是字符串。始终是相同的字符串 - 对于可以从数据库中获取的每一行。

如果$result将作为列的名称，则应在您的查询中将其放入'。