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<li class="toctree-l2"><a class="reference internal" href="../incoming/routing.html">URI Routing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/controllers.html">Controllers</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/filters.html">Controller Filters</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/message.html">HTTP Messages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/request.html">Request Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/incomingrequest.html">IncomingRequest Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/content_negotiation.html">Content Negotiation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/methodspoofing.html">HTTP Method Spoofing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../incoming/restful.html">RESTful Resource Handling</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../outgoing/index.html">Building Responses</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../outgoing/response.html">HTTP Responses</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../outgoing/api_responses.html">API Response Trait</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../outgoing/localization.html">Localization</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../outgoing/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
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</li>
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</ul>
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<ul class="current">
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<li class="toctree-l1 current"><a class="reference internal" href="index.html">Working With Databases</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="examples.html">Quick Start: Usage Examples</a></li>
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<li class="toctree-l2"><a class="reference internal" href="configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="connecting.html">Connecting to a Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="queries.html">Running Queries</a></li>
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<li class="toctree-l2"><a class="reference internal" href="results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="helpers.html">Query Helper Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">Transactions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="call_function.html">Custom Function Calls</a></li>
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<li class="toctree-l2"><a class="reference internal" href="events.html">Database Events</a></li>
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<li class="toctree-l2"><a class="reference internal" href="utilities.html">Database Utilities</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../models/index.html">Modeling Data</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../models/model.html">Using CodeIgniter's Model</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../models/entities.html">Using Entity Classes</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../dbmgmt/index.html">Managing Databases</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../dbmgmt/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../dbmgmt/migration.html">Database Migrations</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../dbmgmt/seeds.html">Database Seeding</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../dbmgmt/db_commands.html">Database Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Library Reference</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/curlrequest.html">CURLRequest Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Service</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/files.html">Working with Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/files.html#file-collections">File Collections</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/honeypot.html">Honeypot Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/images.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/publisher.html">Publisher</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/throttler.html">Throttler</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/time.html">Times and Dates</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uploaded_files.html">Working with Uploaded Files</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">Working with URIs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/validation.html">Validation</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/filesystem_helper.html">Filesystem Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/test_helper.html">Test Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../testing/index.html">Testing</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../testing/overview.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/database.html">Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/fabricator.html">Generating Data</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/controllers.html">Controller Testing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/feature.html">HTTP Testing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/response.html">Testing Responses</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/benchmark.html">Benchmarking</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/debugging.html">Debugging Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/mocking.html">Mocking</a></li>
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</ul>
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</li>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../cli/index.html">Command Line Usage</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_overview.html">CLI Overview</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_controllers.html">Running Controllers via CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/spark_commands.html">Spark Commands</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_commands.html">Creating Spark Commands</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_generators.html">CLI Generators</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_library.html">CLI Library</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_request.html">CLIRequest Class</a></li>
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</ul>
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</ul>
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="../extending/index.html">Extending CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../extending/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/common.html">Replacing Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/events.html">Events</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/basecontroller.html">Extending the Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/authentication.html">Authentication</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/contributing.html">Contributing to CodeIgniter</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="../libraries/official_packages.html">Official Packages</a></li>
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<li><a href="../index.html" class="icon icon-home"></a></li>
|
||
<li class="breadcrumb-item"><a href="index.html">Working With Databases</a></li>
|
||
<li class="breadcrumb-item active">Transactions</li>
|
||
<li class="wy-breadcrumbs-aside">
|
||
</li>
|
||
</ul>
|
||
<hr/>
|
||
</div>
|
||
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
|
||
<div itemprop="articleBody">
|
||
|
||
<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="contents local topic" id="contents">
|
||
<ul class="simple">
|
||
<li><p><a class="reference internal" href="#codeigniter-s-approach-to-transactions" id="id1">CodeIgniter’s Approach to Transactions</a></p></li>
|
||
<li><p><a class="reference internal" href="#running-transactions" id="id2">Running Transactions</a></p></li>
|
||
<li><p><a class="reference internal" href="#strict-mode" id="id3">Strict Mode</a></p></li>
|
||
<li><p><a class="reference internal" href="#managing-errors" id="id4">Managing Errors</a></p></li>
|
||
<li><p><a class="reference internal" href="#disabling-transactions" id="id5">Disabling Transactions</a></p></li>
|
||
<li><p><a class="reference internal" href="#test-mode" id="id6">Test Mode</a></p></li>
|
||
<li><p><a class="reference internal" href="#running-transactions-manually" id="id7">Running Transactions Manually</a></p></li>
|
||
<li><p><a class="reference internal" href="#nested-transactions" id="id8">Nested Transactions</a></p></li>
|
||
</ul>
|
||
</div>
|
||
<section id="codeigniter-s-approach-to-transactions">
|
||
<h2><a class="toc-backref" href="#id1">CodeIgniter’s Approach to Transactions</a><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 is 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>
|
||
</section>
|
||
<section id="running-transactions">
|
||
<h2><a class="toc-backref" href="#id2">Running Transactions</a><a class="headerlink" href="#running-transactions" title="Permalink to this headline"></a></h2>
|
||
<p>To run your queries using transactions you will use the
|
||
<code class="docutils literal notranslate"><span class="pre">$this->db->transStart()</span></code> and <code class="docutils literal notranslate"><span class="pre">$this->db->transComplete()</span></code> methods as
|
||
follows:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</span><span class="p">();</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AN SQL QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'ANOTHER QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AND YET ANOTHER QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</span><span class="p">();</span>
|
||
</pre></div>
|
||
</div>
|
||
<p>You can run as many queries as you want between the <code class="docutils literal notranslate"><span class="pre">transStart()</span></code>/<code class="docutils literal notranslate"><span class="pre">transComplete()</span></code>
|
||
methods and they will all be committed or rolled back based on the success
|
||
or failure of any given query.</p>
|
||
</section>
|
||
<section id="strict-mode">
|
||
<h2><a class="toc-backref" href="#id3">Strict Mode</a><a class="headerlink" href="#strict-mode" title="Permalink to this headline"></a></h2>
|
||
<p>By default, CodeIgniter runs all transactions in Strict Mode. When strict
|
||
mode is enabled, if you are running multiple groups of transactions, if
|
||
one group fails all subsequent groups will be rolled back. If strict mode is
|
||
disabled, each group is treated independently, meaning a failure of one
|
||
group will not affect any others.</p>
|
||
<p>Strict Mode can be disabled as follows:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStrict</span><span class="p">(</span><span class="k">false</span><span class="p">);</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="managing-errors">
|
||
<h2><a class="toc-backref" href="#id4">Managing Errors</a><a class="headerlink" href="#managing-errors" title="Permalink to this headline"></a></h2>
|
||
<p>When you have <code class="docutils literal notranslate"><span class="pre">DBDebug</span></code> true in your <strong>app/Config/Database.php</strong> file,
|
||
if a query error occurs, all the queries will be rolled backed, and an exception
|
||
will be thrown. So you’ll see a standard error page.</p>
|
||
<p>If the <code class="docutils literal notranslate"><span class="pre">DBDebug</span></code> is false, you can manage your own errors like this:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</span><span class="p">();</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AN SQL QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'ANOTHER QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</span><span class="p">();</span>
|
||
|
||
<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStatus</span><span class="p">()</span> <span class="o">===</span> <span class="k">false</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="c1">// generate an error... or use the log_message() function to log your error</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="disabling-transactions">
|
||
<h2><a class="toc-backref" href="#id5">Disabling Transactions</a><a class="headerlink" href="#disabling-transactions" title="Permalink to this headline"></a></h2>
|
||
<p>Transactions are enabled by default. If you would like to disable transactions you
|
||
can do so using <code class="docutils literal notranslate"><span class="pre">$this->db->transOff()</span></code>:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transOff</span><span class="p">();</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</span><span class="p">();</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AN SQL QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</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.</p>
|
||
</section>
|
||
<section id="test-mode">
|
||
<h2><a class="toc-backref" href="#id6">Test Mode</a><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
|
||
<code class="docutils literal notranslate"><span class="pre">$this->db->transStart()</span></code> method to true:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</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">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AN SQL QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</span><span class="p">();</span>
|
||
</pre></div>
|
||
</div>
|
||
</section>
|
||
<section id="running-transactions-manually">
|
||
<h2><a class="toc-backref" href="#id7">Running Transactions Manually</a><a class="headerlink" href="#running-transactions-manually" title="Permalink to this headline"></a></h2>
|
||
<p>When you have <code class="docutils literal notranslate"><span class="pre">DBDebug</span></code> false in your <strong>app/Config/Database.php</strong> file, and
|
||
if you would like to run transactions manually you can do so as follows:</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transBegin</span><span class="p">();</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AN SQL QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'ANOTHER QUERY...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'AND YET ANOTHER QUERY...'</span><span class="p">);</span>
|
||
|
||
<span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStatus</span><span class="p">()</span> <span class="o">===</span> <span class="k">false</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transRollback</span><span class="p">();</span>
|
||
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transCommit</span><span class="p">();</span>
|
||
<span class="p">}</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>Make sure to use <code class="docutils literal notranslate"><span class="pre">$this->db->transBegin()</span></code> when running manual
|
||
transactions, <strong>NOT</strong> <code class="docutils literal notranslate"><span class="pre">$this->db->transStart()</span></code>.</p>
|
||
</div>
|
||
</section>
|
||
<section id="nested-transactions">
|
||
<h2><a class="toc-backref" href="#id8">Nested Transactions</a><a class="headerlink" href="#nested-transactions" title="Permalink to this headline"></a></h2>
|
||
<p>In CodeIgniter, transactions can be nested in a way such that only the
|
||
outmost or top-level transaction commands are executed. You can include as
|
||
many pairs of <code class="docutils literal notranslate"><span class="pre">transStart()</span></code>/<code class="docutils literal notranslate"><span class="pre">transComplete()</span></code> or <code class="docutils literal notranslate"><span class="pre">transBegin()</span></code>/<code class="docutils literal notranslate"><span class="pre">transCommit()</span></code>/<code class="docutils literal notranslate"><span class="pre">transRollback()</span></code>
|
||
as you want inside a transaction block and so on. CodeIgniter will keep
|
||
track of the transaction “depth” and only take action at the outermost layer
|
||
(zero depth).</p>
|
||
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
|
||
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</span><span class="p">();</span> <span class="c1">// actually starts a transaction</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'SOME QUERY 1 ...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transStart</span><span class="p">();</span> <span class="c1">// doesn't necessarily start another transaction</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'SOME QUERY 2 ...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</span><span class="p">();</span> <span class="c1">// doesn't necessarily end the transaction, but required to finish the inner transaction</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">query</span><span class="p">(</span><span class="s1">'SOME QUERY 3 ...'</span><span class="p">);</span>
|
||
<span class="nv">$this</span><span class="o">-></span><span class="na">db</span><span class="o">-></span><span class="na">transComplete</span><span class="p">();</span> <span class="c1">// actually ends the transaction</span>
|
||
</pre></div>
|
||
</div>
|
||
<div class="admonition note">
|
||
<p class="admonition-title">Note</p>
|
||
<p>In case the structure is far more complex, it’s your responsibility
|
||
to ensure that the inner transactions can reach the outermost layer again
|
||
in order to be fully executed by the database, thus prevents unintended
|
||
commits/rollbacks.</p>
|
||
</div>
|
||
</section>
|
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||
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