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POProper PDO way to handle freeing resources after stored procedure with multiple queries?
 

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  1. POProper PDO way to handle freeing resources after stored procedure with multiple queries?
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    <p>I am working on replacing usage of <code>mysqli</code> with <code>PDO</code> in the database connector file of <a href="http://dbapi.scientiamobile.com/wiki/index.php/Main_Page" rel="nofollow">Tera-WURFL</a>, because our server has PHP 5.2.6 and mysqli does not support persistent connections until 5.3.0. </p> <p>So, I am replacing all mysqli code with PDO code. Having done with the basic data retrieval and processing, I have come to this part of freeing up resources, where I am not sure how exactly to replace the following - </p> <pre><code>protected function cleanConnection(){ while($this-&gt;dbcon-&gt;more_results()){ $this-&gt;dbcon-&gt;next_result(); $res = $this-&gt;dbcon-&gt;use_result(); if ($res instanceof mysqli_result){$res-&gt;free();} } } </code></pre> <p>The above function is called every time after calling a stored procedure. I guess this function fetches any remaining results and cleans the pipe between the master and the slave. Can somebody answer if what I guess is correct and explain why is this done only in this case.</p> <p>Following is a sample stored proc call from the database connector file of Tera-WURFL which calls the above function afterwards - </p> <pre><code>$query = sprintf("CALL ".TeraWurflConfig::$TABLE_PREFIX."_RIS(%s,%s,%s)",$this-&gt;SQLPrep($userAgent),$tolerance,$this-&gt;SQLPrep($matcher-&gt;tableSuffix())); $res = $this-&gt;dbcon-&gt;query($query); //this calls TeraWurfl_RIS() stored proc if(!$res){ throw new Exception(sprintf("Error in DB RIS Query: %s. \nQuery: %s\n",$this-&gt;dbcon-&gt;error,$query)); exit(); } $data = $res-&gt;fetch_assoc(); $this-&gt;cleanConnection(); //calling cleanConnection() </code></pre> <p>Following is the stored procedure being called above - </p> <pre><code>CREATE PROCEDURE `TeraWurfl_RIS`(IN ua VARCHAR(255), IN tolerance INT, IN matcher VARCHAR(64)) BEGIN DECLARE curlen INT; DECLARE wurflid VARCHAR(64) DEFAULT NULL; DECLARE curua VARCHAR(255); SELECT CHAR_LENGTH(ua) INTO curlen; findua: WHILE ( curlen &gt;= tolerance ) DO SELECT CONCAT(LEFT(ua, curlen ),'%') INTO curua; SELECT idx.DeviceID INTO wurflid FROM TeraWurflIndex idx INNER JOIN TeraWurflMerge mrg ON idx.DeviceID = mrg.DeviceID WHERE mrg.match = 1 AND idx.matcher = matcher AND mrg.user_agent LIKE curua LIMIT 1; IF wurflid IS NOT NULL THEN LEAVE findua; END IF; SELECT curlen - 1 INTO curlen; END WHILE; SELECT wurflid as DeviceID; END </code></pre> <p><strong>What I have got so far</strong> </p> <pre><code>protected function cleanConnection($resultObj){ if($resultObj instanceof PDOStatement) { while($res = $resultObj-&gt;fetch()){ if ($res instanceof PDO){$res = null;} } } } </code></pre> <p>And this is how I am calling -</p> <pre><code>$query = sprintf("CALL ".TeraWurflConfig::$TABLE_PREFIX."_RIS(:userAgent,:tolerance,:tableSuffix)"); $queryHandle = $this-&gt;dbcon-&gt;prepare($query); $queryHandle-&gt;execute(array(':userAgent' =&gt; $userAgent,':tolerance' =&gt; $tolerance,':tableSuffix' =&gt; $matcher-&gt;tableSuffix())); $data = $queryHandle-&gt;fetch(); $this-&gt;cleanConnection($queryHandle); //calling here </code></pre> <p><strong>Update</strong><br> This piece of code is going to be put in our ad delivery servers which are multiple in number and serve high traffic. I guess under such conditions handling the freeing of resources becomes important which why this was done in the original file. Can somebody comment on this? Thanks...</p>
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    1. USSandeepan Nath
    1. USSandeepan Nath
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      1. POProper PDO way to handle freeing resources after stored procedure with multiple queries?
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      1. VTUpMod
    1. COI have even worse scenario. Since I might have select and insert in same file after execution I won't get statement so no way to call closeCursor() and I can't find how to do that otherwise.
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      1. USAram
    2. COhttp://php.net/manual/en/class.pdostatement.php inspired the solution. First I have to prepare so that I get reference to statement and after that call execute and after that commit on connection and after that closeCursor on statement and only after that another query.
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      1. USAram
 

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