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  <div class="section" id="upgrading-from-3-1-1-to-3-1-2">
<h1>Upgrading from 3.1.1 to 3.1.2<a class="headerlink" href="#upgrading-from-3-1-1-to-3-1-2" title="Permalink to this headline">¶</a></h1>
<p>Before performing an update you should take your site offline by
replacing the index.php file with a static one.</p>
<div class="section" id="step-1-update-your-codeigniter-files">
<h2>Step 1: Update your CodeIgniter files<a class="headerlink" href="#step-1-update-your-codeigniter-files" title="Permalink to this headline">¶</a></h2>
<p>Replace all files and directories in your <em>system/</em> directory.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">If you have any custom developed files in these directories,
please make copies of them first.</p>
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<div class="section" id="step-2-update-your-ci-sessions-database-table">
<h2>Step 2: Update your &#8220;ci_sessions&#8221; database table<a class="headerlink" href="#step-2-update-your-ci-sessions-database-table" title="Permalink to this headline">¶</a></h2>
<p>If you&#8217;re using the <a class="reference internal" href="../libraries/sessions.html"><em>Session Library</em></a> with the
&#8216;database&#8217; driver, you may have to <tt class="docutils literal"><span class="pre">ALTER</span></tt> your sessions table for your
sessions to continue to work.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The table in question is not necessarily named &#8220;ci_sessions&#8221;.
It is what you&#8217;ve set as your <tt class="docutils literal"><span class="pre">$config['sess_save_path']</span></tt>.</p>
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<p>This will only affect you if you&#8217;ve changed your <tt class="docutils literal"><span class="pre">session.hash_function</span></tt>
<em>php.ini</em> setting to something like &#8216;sha512&#8217;. Or if you&#8217;ve been running
an older CodeIgniter version on PHP 7.1+.</p>
<p>It is recommended that you do this anyway, just to avoid potential issues
in the future if you do change your configuration.</p>
<p>Just execute the one of the following SQL queries, depending on your
database:</p>
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// MySQL:</span>
<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">CHANGE</span> <span class="nx">id</span> <span class="nx">id</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">)</span> <span class="k">NOT</span> <span class="k">NULL</span><span class="p">;</span>

<span class="c1">// PostgreSQL</span>
<span class="nx">ALTER</span> <span class="nx">TABLE</span> <span class="nx">ci_sessions</span> <span class="nx">ALTER</span> <span class="nx">COLUMN</span> <span class="nx">id</span> <span class="nx">SET</span> <span class="nx">DATA</span> <span class="nx">TYPE</span> <span class="nx">varchar</span><span class="p">(</span><span class="mi">128</span><span class="p">);</span>
</pre></div>
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