Question

我怎樣寫這樣的事情與PDO？：

 $query = "SELECT * 
     FROM trx 
     WHERE item_id = $item_id 
     AND NOT (trx_state=3 OR trx_state=4) 

這是我有：

$query = 'SELECT * 
FROM trx 
WHERE item_id = :item_id AND NOT (trx_state = :trx_state OR trx_state = :trx_state'; 

$stmt = $db->prepare($query, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY)); 
$stmt->execute(array(':item_id' => $item_id, ':trx_state' => '3', '4')); 

我m不完全確定如何設置它在哪裏：trx_state同時具有值​​3和4.

Answer 1

:trx_state不必匹配您正在比較它的值，因此您可以將代碼更改爲：

$query = 'SELECT * 
FROM trx 
WHERE item_id = :item_id AND NOT (trx_state = :trx_state_1 OR trx_state = :trx_state_2'; 

$stmt = $db->prepare($query, array(PDO::ATTR_CURSOR => PDO::CURSOR_FWDONLY)); 
$stmt->execute(array(':item_id' => $item_id, ':trx_state_1' => '3', ':trx_state_2' => '4')); 

基本上:trx_state只是變量，可以命名爲任何你想要的。