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POExecuting multiple queries in codeigniter that cannot be executed one by one
 

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  1. POExecuting multiple queries in codeigniter that cannot be executed one by one
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    <p>I have an "event" table. For simplicity, you can imagine that it should be like a <strong>hierarchical category</strong>. It uses the <strong>nested set model</strong> (Thanks to Mark Hillyer for his post at <a href="http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/" rel="noreferrer">http://mikehillyer.com/articles/managing-hierarchical-data-in-mysql/</a>)</p> <p>My code:</p> <pre><code>$query = "LOCK TABLE event WRITE; SELECT @ParentRight := parent.rgt, @Level := parent.level FROM event AS parent WHERE parent.id = '{$data['parent_id']}'; UPDATE event SET rgt = rgt + 2 WHERE rgt &gt; @ParentRight; UPDATE event SET lft = lft + 2 WHERE lft &gt; @ParentRight; INSERT INTO event(lft, rgt, level) VALUES(@ParentRight, @ParentRight + 1, @Level); UNLOCK TABLES;"; mysqli_multi_query($this-&gt;db-&gt;conn_id, $query); $data['id'] = $this-&gt;db-&gt;insert_id(); return $this-&gt;db-&gt;update('event', $data); </code></pre> <p>And after that I'm going to update the last inserted object with <code>$this-&gt;db-&gt;update('event', $data)</code></p> <p><code>$data</code> is an array that user has filled.</p> <hr> <p>Problem 1:</p> <p>I couldn't execute <strong>$query</strong> with <strong>$this->db->query($query);</strong>;</p> <p>Solution 1 that didn't work:</p> <p>I. Use <strong>mysqli</strong> db engine.</p> <p>II. <code>mysqli_multi_query($this-&gt;db-&gt;conn_id, $query);</code> While I thought it works, it is giving the following error:</p> <p><code>Commands out of sync; you can’t run this command now.</code></p> <hr> <p>Problem 2:</p> <p><code>$this-&gt;db-&gt;insert_id()</code> doesn't work (returns 0)</p> <p>Problem 3:</p> <p><code>$this-&gt;db-&gt;update('event', $data);</code> errors: <code>Commands out of sync; you can't run this command now</code></p> <hr> <p>How can I correct this code to work? I'd be even happy to find a solution for the first problem.</p>
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    1. USMohammad Naji
    1. USMohammad Naji
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      1. POExecuting multiple queries in codeigniter that cannot be executed one by one
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      1. VTUpMod
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    1. COYou could have an array of single queries and execute them in a loop
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      1. USGordonM
    2. CONo, as you can see in this case executing as separate queries doesn't work because it cannot recall `@myRight` and `@Level` vars from past queries' results
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      1. USMohammad Naji
    3. COAre variables not preserved until you disconnect?
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      1. POExecuting multiple queries in codeigniter that cannot be executed one by one
      1. USGordonM
 

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