Question

如何使用PDO编写类似的内容？：

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

这就是我所拥有的：

$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'));

我不确定如何设置它：trx_state的值为3和4。

Answer 1

:trx_state不必匹配您要与之比较的值，因此您可以将代码更改为：

$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只是变量，可以根据您的喜好命名。

如何编写具有多个字段值的PDO预处理语句

1 个答案: