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POPHP MySQL PDO stored procedures and INOUT parameters
 

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  1. POPHP MySQL PDO stored procedures and INOUT parameters
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    <p>I am using some stored procedures against a datastore shared by more than one application and need to call a stored procedure that has an <code>INOUT</code> parameter.</p> <p>From documentation this would work something like</p> <pre><code>$prob_param = null; $stmt = $pdo-&gt;prepare('CALL obnoxiousStoredProc(:problem_param)'); $stmt-&gt;bindParam(':problem_param', $prob_param, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT, 11); $stmt-&gt;execute(); echo 'Prob param: ' . var_export($prob_param, true); </code></pre> <p>And we would see something like</p> <pre><code>Prob param: int(420) </code></pre> <p>BUT <strong>There is a bug</strong> that prevents this from working as expected <a href="https://stackoverflow.com/a/4502524/701368">See this answer</a>. </p> <p>So instead we get </p> <pre><code>Syntax error or access violation: 1414 OUT or INOUT argument $parameter_number for routine $procedure_name is not a variable or NEW pseudo-variable </code></pre> <p>The workaround, as described in the answer is two-fold, separate your input and output parameters (which I can get my DBA to do) and use local variables</p> <p>e.g.</p> <pre><code>$stmt = $pdo-&gt;prepare('CALL obnoxiousStoredProc(@problem_param)'); </code></pre> <p>and then use a second query</p> <pre><code>SELECT @problem_param </code></pre> <p>To get your value.</p> <p><strong>My question is: what is the scope of this "local variable" in PDO? Am I setting myself for a race condition if my php code is getting simultaneously?</strong></p>
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