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- <div class="section" id="transactions">
-<h1>Transactions<a class="headerlink" href="#transactions" title="Permalink to this headline">¶</a></h1>
-<p>CodeIgniter’s database abstraction allows you to use transactions with
-databases that support transaction-safe table types. In MySQL, you’ll
-need to be running InnoDB or BDB table types rather than the more common
-MyISAM. Most other database platforms support transactions natively.</p>
-<p>If you are not familiar with transactions we recommend you find a good
-online resource to learn about them for your particular database. The
-information below assumes you have a basic understanding of
-transactions.</p>
-<div class="section" id="codeigniter-s-approach-to-transactions">
-<h2>CodeIgniter’s Approach to Transactions<a class="headerlink" href="#codeigniter-s-approach-to-transactions" title="Permalink to this headline">¶</a></h2>
-<p>CodeIgniter utilizes an approach to transactions that is very similar to
-the process used by the popular database class ADODB. We’ve chosen that
-approach because it greatly simplifies the process of running
-transactions. In most cases all that is required are two lines of code.</p>
-<p>Traditionally, transactions have required a fair amount of work to
-implement since they demand that you keep track of your queries and
-determine whether to commit or rollback based on the success or failure
-of your queries. This is particularly cumbersome with nested queries. In
-contrast, we’ve implemented a smart transaction system that does all
-this for you automatically (you can also manage your transactions
-manually if you choose to, but there’s really no benefit).</p>
-</div>
-<div class="section" id="running-transactions">
-<h2>Running Transactions<a class="headerlink" href="#running-transactions" title="Permalink to this headline">¶</a></h2>
-<p>To run your queries using transactions you will use the
-$this-&gt;db-&gt;trans_start() and $this-&gt;db-&gt;trans_complete() functions as
-follows:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_start</span><span class="p">();</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AN SQL QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;ANOTHER QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AND YET ANOTHER QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_complete</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>You can run as many queries as you want between the start/complete
-functions and they will all be committed or rolled back based on success
-or failure of any given query.</p>
-</div>
-<div class="section" id="strict-mode">
-<h2>Strict Mode<a class="headerlink" href="#strict-mode" title="Permalink to this headline">¶</a></h2>
-<p>By default CodeIgniter runs all transactions in Strict Mode. When strict
-mode is enabled, if you are running multiple groups of transactions, if
-one group fails all groups will be rolled back. If strict mode is
-disabled, each group is treated independently, meaning a failure of one
-group will not affect any others.</p>
-<p>Strict Mode can be disabled as follows:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_strict</span><span class="p">(</span><span class="k">FALSE</span><span class="p">);</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="managing-errors">
-<h2>Managing Errors<a class="headerlink" href="#managing-errors" title="Permalink to this headline">¶</a></h2>
-<p>If you have error reporting enabled in your config/database.php file
-you’ll see a standard error message if the commit was unsuccessful. If
-debugging is turned off, you can manage your own errors like this:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_start</span><span class="p">();</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AN SQL QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;ANOTHER QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_complete</span><span class="p">();</span>
-
-<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_status</span><span class="p">()</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span>
-<span class="p">{</span>
- <span class="c1">// generate an error... or use the log_message() function to log your error</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="disabling-transactions">
-<h2>Disabling Transactions<a class="headerlink" href="#disabling-transactions" title="Permalink to this headline">¶</a></h2>
-<p>If you would like to disable transactions you can do so using
-<code class="docutils literal"><span class="pre">$this-&gt;db-&gt;trans_off()</span></code>:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_off</span><span class="p">();</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_start</span><span class="p">();</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AN SQL QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_complete</span><span class="p">();</span>
-</pre></div>
-</div>
-<p>When transactions are disabled, your queries will be auto-committed, just as
-they are when running queries without transactions, practically ignoring
-any calls to <code class="docutils literal"><span class="pre">trans_start()</span></code>, <code class="docutils literal"><span class="pre">trans_complete()</span></code>, etc.</p>
-</div>
-<div class="section" id="test-mode">
-<h2>Test Mode<a class="headerlink" href="#test-mode" title="Permalink to this headline">¶</a></h2>
-<p>You can optionally put the transaction system into “test mode”, which
-will cause your queries to be rolled back – even if the queries produce
-a valid result. To use test mode simply set the first parameter in the
-$this-&gt;db-&gt;trans_start() function to TRUE:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_start</span><span class="p">(</span><span class="k">TRUE</span><span class="p">);</span> <span class="c1">// Query will be rolled back</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AN SQL QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_complete</span><span class="p">();</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="running-transactions-manually">
-<h2>Running Transactions Manually<a class="headerlink" href="#running-transactions-manually" title="Permalink to this headline">¶</a></h2>
-<p>If you would like to run transactions manually you can do so as follows:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_begin</span><span class="p">();</span>
-
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AN SQL QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;ANOTHER QUERY...&#39;</span><span class="p">);</span>
-<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">query</span><span class="p">(</span><span class="s1">&#39;AND YET ANOTHER QUERY...&#39;</span><span class="p">);</span>
-
-<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_status</span><span class="p">()</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span>
-<span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_rollback</span><span class="p">();</span>
-<span class="p">}</span>
-<span class="k">else</span>
-<span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">db</span><span class="o">-&gt;</span><span class="na">trans_commit</span><span class="p">();</span>
-<span class="p">}</span>
-</pre></div>
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-<div class="admonition note">
-<p class="first admonition-title">Note</p>
-<p class="last">Make sure to use $this-&gt;db-&gt;trans_begin() when running manual
-transactions, <strong>NOT</strong> $this-&gt;db-&gt;trans_start().</p>
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