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authorDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
committerDerek Jones <derek.jones@ellislab.com>2011-10-05 20:34:52 +0200
commit8ede1a2ecbb62577afd32996956c5feaf7ddf9b6 (patch)
tree2e960ec3b416b477f40bb546371f2d486f4a22f0 /user_guide/database/transactions.html
parentd1ecd5cd4ae6ab5d37df9fbda14b93977b9e743c (diff)
replacing the old HTML user guide with a Sphinx-managed user guide
Diffstat (limited to 'user_guide/database/transactions.html')
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@@ -1,200 +0,0 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
-<head>
-
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<title>Transactions : CodeIgniter User Guide</title>
-
-<style type='text/css' media='all'>@import url('../userguide.css');</style>
-<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
-
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-<meta name='robots' content='all' />
-<meta name='author' content='ExpressionEngine Dev Team' />
-<meta name='description' content='CodeIgniter User Guide' />
-
-</head>
-<body>
-
-<!-- START NAVIGATION -->
-<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
-<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
-<div id="masthead">
-<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
-<tr>
-<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td>
-<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
-</tr>
-</table>
-</div>
-<!-- END NAVIGATION -->
-
-
-
-<!-- START BREADCRUMB -->
-<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
-<tr>
-<td id="breadcrumb">
-<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
-<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
-<a href="index.html">Database Library</a> &nbsp;&#8250;&nbsp;
-Transactions
-</td>
-<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>
-</tr>
-</table>
-<!-- END BREADCRUMB -->
-
-
-<br clear="all" />
-
-
-<!-- START CONTENT -->
-<div id="content">
-
-
-<h1>Transactions</h1>
-
-<p>CodeIgniter's database abstraction allows you to use <dfn>transactions</dfn> 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>
-
-<h2>CodeIgniter's Approach to Transactions</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 to keep track of your queries
-and determine whether to <dfn>commit</dfn> or <dfn>rollback</dfn> 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>
-
-<h2>Running Transactions</h2>
-
-<p>To run your queries using transactions you will use the <dfn>$this->db->trans_start()</dfn> and <dfn>$this->db->trans_complete()</dfn> functions as follows:</p>
-
-<code>
-<kbd>$this->db->trans_start();</kbd><br />
-$this->db->query('AN SQL QUERY...');<br />
-$this->db->query('ANOTHER QUERY...');<br />
-$this->db->query('AND YET ANOTHER QUERY...');<br />
-<kbd>$this->db->trans_complete();</kbd>
-</code>
-
-<p>You can run as many queries as you want between the start/complete functions and they will all be committed or rolled back based on success or failure
-of any given query.</p>
-
-
-<h2>Strict Mode</h2>
-
-<p>By default CodeIgniter runs all transactions in <dfn>Strict Mode</dfn>. When strict mode is enabled, if you are running multiple groups of
-transactions, if one group fails all groups will be rolled back. If strict mode is disabled, each group is treated independently, meaning
-a failure of one group will not affect any others.</p>
-
-<p>Strict Mode can be disabled as follows:</p>
-
-<code>$this->db->trans_strict(FALSE);</code>
-
-
-<h2>Managing Errors</h2>
-
-<p>If you have error reporting enabled in your <dfn>config/database.php</dfn> 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>
-
-<code>
-$this->db->trans_start();<br />
-$this->db->query('AN SQL QUERY...');<br />
-$this->db->query('ANOTHER QUERY...');<br />
-$this->db->trans_complete();<br />
-<br />
-if (<kbd>$this->db->trans_status()</kbd> === FALSE)<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;// generate an error... or use the log_message() function to log your error<br />
-}
-</code>
-
-
-<h2>Enabling Transactions</h2>
-
-<p>Transactions are enabled automatically the moment you use <dfn>$this->db->trans_start()</dfn>. If you would like to disable transactions you
-can do so using <dfn>$this->db->trans_off()</dfn>:</p>
-
-<code>
-<kbd>$this->db->trans_off()</kbd><br /><br />
-
-$this->db->trans_start();<br />
-$this->db->query('AN SQL QUERY...');<br />
-$this->db->trans_complete();
-</code>
-
-<p class="important">When transactions are disabled, your queries will be auto-commited, just as they are when running queries without transactions.</p>
-
-
-<h2>Test Mode</h2>
-
-<p>You can optionally put the transaction system into "test mode", which will cause your queries to be rolled back -- even if the queries produce a valid result.
-To use test mode simply set the first parameter in the <dfn>$this->db->trans_start()</dfn> function to <samp>TRUE</samp>:</p>
-
-<code>
-$this->db->trans_start(<samp>TRUE</samp>); // Query will be rolled back<br />
-$this->db->query('AN SQL QUERY...');<br />
-$this->db->trans_complete();
-</code>
-
-
-<h2>Running Transactions Manually</h2>
-
-<p>If you would like to run transactions manually you can do so as follows:</p>
-
-<code>
-$this->db->trans_begin();<br /><br />
-
-$this->db->query('AN SQL QUERY...');<br />
-$this->db->query('ANOTHER QUERY...');<br />
-$this->db->query('AND YET ANOTHER QUERY...');<br />
-
-<br />
-
-if ($this->db->trans_status() === FALSE)<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;$this->db->trans_rollback();<br />
-}<br />
-else<br />
-{<br />
-&nbsp;&nbsp;&nbsp;&nbsp;$this->db->trans_commit();<br />
-}<br />
-</code>
-
-<p class="important"><strong>Note:</strong> Make sure to use <kbd>$this->db->trans_begin()</kbd> when running manual transactions, <strong>NOT</strong>
-<dfn>$this->db->trans_start()</dfn>.</p>
-
-
-
-
-</div>
-<!-- END CONTENT -->
-
-
-<div id="footer">
-<p>
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