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authorAndrey Andreev <narf@devilix.net>2018-01-13 12:57:11 +0100
committerAndrey Andreev <narf@devilix.net>2018-01-13 12:57:11 +0100
commit02a0518e1c56ba3506f370362ac5ebdb8a138312 (patch)
tree8b4684192b403dcae17d298eb4fc9e7ab001acad /user_guide/database/transactions.html
parentf0b9735d5857e6c07c8f5824b13cff4828db3cfe (diff)
[ci skip] 3.1.7 release
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+<li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
+</ul>
+</li>
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+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
+</ul>
+</li>
+</ul>
+<ul class="current">
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">Database Reference</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="examples.html">Quick Start: Usage Examples</a></li>
+<li class="toctree-l2"><a class="reference internal" href="configuration.html">Database Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="connecting.html">Connecting to a Database</a></li>
+<li class="toctree-l2"><a class="reference internal" href="queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="query_builder.html">Query Builder Class</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Transactions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="metadata.html">Getting MetaData</a></li>
+<li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching.html">Query Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="forge.html">Database Manipulation with Database Forge</a></li>
+<li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="db_driver_reference.html">Database Driver Reference</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
+</ul>
+</li>
+</ul>
+
+
+
+ </div>
+ &nbsp;
+ </nav>
+
+ <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
+
+
+ <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
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+ <a href="../index.html">CodeIgniter</a>
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+ <li><a href="../index.html">Docs</a> &raquo;</li>
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+ <li><a href="index.html">Database Reference</a> &raquo;</li>
+
+ <li>Transactions</li>
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+
+ </li>
+ <div style="float:right;margin-left:5px;" id="closeMe">
+ <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
+ </div>
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+</div>
+ <div role="main" class="document">
+
+ <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>
+</div>
+<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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