PHP PDO与MS SQL Server的接口

Question

I am having trouble with using PHP PDO interface with Microsoft SQL Server. The problem is with converting PHP number values to use in functions of MS SQL Server. I use the following statement to delete certain records:

$sql = "DELETE FROM table WHERE SUBSTRING(attribute, 1, ?) = ?";

I prepare and execute this statement with code (a little shrinked):

$query = $pdo->prepare ($sql);
$query->execute (array (strlen ('Text'), 'Text')); 

But the query always fails. The error is:

SQLSTATE[42000]: [Microsoft][SQL Server Native Client 11.0][SQL Server]Argument data type nvarchar is invalid for argument 3 of substring function.

I am assuming the number from strlen is not parsed into a number, but I don't know how to fix this (except to manually add into the query).

I have found these links, however not very helpful.

http://social.msdn.microsoft.com/Forums/en-US/sqldriverforphp/thread/0f09ac5e-62cd-4ccf-b2cb-848aad23811e

http://drupal.org/node/1169202

The guys on Drupal had same error, but they fixed it with recreating function with casts. Is there any other way to fix this?

Thanks.

Answer 1

Not sure if this will solve it, but try something like this

$length = strlen('Text');
$text = "Text";

$sql = "DELETE FROM table WHERE SUBSTRING(attribute, 1, :len) = :text";
$query = $pdo->prepare ($sql);
$query->bindParam(':len', $length, PDO::PARAM_INT);
$query->bindParam(':text', $text, PDO::PARAM_STR);
$query->execute(); 

Answer 2

Try:

$query = $pdo->prepare ($sql);
$query->execute (array ((int) strlen ('Text'), 'Text'));