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POPDO with MSSQL driver how to get output parameters?
 

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  1. POPDO with MSSQL driver how to get output parameters?
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    <p>When you are using <a href="http://php.net/manual/ru/book.pdo.php" rel="noreferrer"><code>PDO</code></a> with <a href="http://www.php.net/manual/ru/ref.pdo-sqlsrv.php" rel="noreferrer">MSSQL driver</a> you actually use <a href="http://www.freetds.org/" rel="noreferrer">FreeTDS</a> as low level driver. There is some different ways to execute stored procedures - <strong>language queries</strong> and <a href="http://www.freetds.org/tds.html" rel="noreferrer"><strong>RPC call</strong></a>.</p> <p>FreeTDS also supports TDS protocol version 4.2 and 7.x. The one of main difference between them is a behaviour of stored procedure call. Microsoft changed the behaviour from protocol 4.2 to 7.0 not returning output parameters from language queries. <strong>Language queries</strong> mainly send the textual query to the server wrapping into a TDS packet. </p> <h3>Example of language query with PDO (from <a href="http://www.php.net/pdo.prepared-statements" rel="noreferrer">php.net</a>)</h3> <pre><code> $stmt = $dbh-&gt;prepare("CALL sp_takes_string_returns_string(?)"); $value = 'Hello!'; $stmt-&gt;bindParam(1, $value, PDO::PARAM_STR|PDO::PARAM_INPUT_OUTPUT, 4000); $stmt-&gt;execute(); print "The output is $value\n"; </code></pre> <p>Actually you send something like "EXEC sp_takes....". And if you run sample above with MSSQL you would get empty output parameter in TDS 7.х and expected result with 4.2. Why we can`t use 4.2 and be happy? It has a lot of <a href="http://www.freetds.org/userguide/choosingtdsprotocol.htm" rel="noreferrer">limitations</a>:</p> <ul> <li>ASCII only, of course. </li> <li>RPC and BCP is not supported.</li> <li>varchar fields are limited to 255 characters. If your table defines longer fields, they'll be truncated. </li> <li>dynamic queries (also called <code>prepared statements</code>) are not supported.</li> </ul> <p>So, the 4.2 is not a variant. </p> <h3>Example of RPC call (from <a href="http://docs.php.net/manual/en/function.mssql-execute.php" rel="noreferrer">php.net odbtp extension</a>)</h3> <pre><code> $stmt = mssql_init('sp_takes_string_returns_string'); $value = 'Hello!'; mssql_bind($stmt, 1, $value, SQLVARCHAR, true, false, 4000); mssql_execute($stmt); print "The output is $value\n"; </code></pre> <p>Using sample above with native mssql extension in php you got right result with TDS 7.2. Actually you send binary RPC packet with that code.</p> <h2>Question</h2> <p>Is there is any way to make RPC call for stored procedure with PDO and MSSQL driver?</p>
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    1. USYan Sklyarenko
    1. USmisterion
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      1. VTUpMod
    2. VO
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    3. VO
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      1. VTUpMod
    1. COI remember something about needing to consume the result-set for the outputs to be assigned. Have you tried calling to $stmt->fetchAll(); after your call to execute : `mssql_execute($stmt); $stmt->fetchAll(); ...` , but before using the value of $value.
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      1. POPDO with MSSQL driver how to get output parameters?
      1. USGavin
    2. CODoes not work unfortunately.
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      1. USmisterion
 

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