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+  <title>Database Forge Class &mdash; CodeIgniter 3.1.10 documentation</title>
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+<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>
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+<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>
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+<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"><a class="reference internal" href="transactions.html">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 current"><a class="current reference internal" href="#">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>
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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>
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+<li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
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+<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"><a class="reference internal" href="transactions.html">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 current"><a class="current reference internal" href="#">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">
+        <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+        <a href="../index.html">CodeIgniter</a>
+      </nav>
+
+
+      
+      <div class="wy-nav-content">
+        <div class="rst-content">
+          <div role="navigation" aria-label="breadcrumbs navigation">
+  <ul class="wy-breadcrumbs">
+    <li><a href="../index.html">Docs</a> &raquo;</li>
+      
+        <li><a href="index.html">Database Reference</a> &raquo;</li>
+      
+    <li>Database Forge Class</li>
+    <li class="wy-breadcrumbs-aside">
+      
+    </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>
+  </ul>
+  <hr/>
+</div>
+          <div role="main" class="document">
+            
+  <div class="section" id="database-forge-class">
+<h1><a class="toc-backref" href="#id1">Database Forge Class</a><a class="headerlink" href="#database-forge-class" title="Permalink to this headline">¶</a></h1>
+<p>The Database Forge Class contains methods that help you manage your
+database.</p>
+<div class="contents topic" id="table-of-contents">
+<p class="topic-title first">Table of Contents</p>
+<ul class="simple">
+<li><a class="reference internal" href="#database-forge-class" id="id1">Database Forge Class</a><ul>
+<li><a class="reference internal" href="#initializing-the-forge-class" id="id2">Initializing the Forge Class</a></li>
+<li><a class="reference internal" href="#creating-and-dropping-databases" id="id3">Creating and Dropping Databases</a></li>
+<li><a class="reference internal" href="#creating-and-dropping-tables" id="id4">Creating and Dropping Tables</a><ul>
+<li><a class="reference internal" href="#adding-fields" id="id5">Adding fields</a></li>
+<li><a class="reference internal" href="#adding-keys" id="id6">Adding Keys</a></li>
+<li><a class="reference internal" href="#creating-a-table" id="id7">Creating a table</a></li>
+<li><a class="reference internal" href="#dropping-a-table" id="id8">Dropping a table</a></li>
+<li><a class="reference internal" href="#renaming-a-table" id="id9">Renaming a table</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#modifying-tables" id="id10">Modifying Tables</a><ul>
+<li><a class="reference internal" href="#adding-a-column-to-a-table" id="id11">Adding a Column to a Table</a></li>
+<li><a class="reference internal" href="#dropping-a-column-from-a-table" id="id12">Dropping a Column From a Table</a></li>
+<li><a class="reference internal" href="#modifying-a-column-in-a-table" id="id13">Modifying a Column in a Table</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#class-reference" id="id14">Class Reference</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="initializing-the-forge-class">
+<h2><a class="toc-backref" href="#id2">Initializing the Forge Class</a><a class="headerlink" href="#initializing-the-forge-class" title="Permalink to this headline">¶</a></h2>
+<div class="admonition important">
+<p class="first admonition-title">Important</p>
+<p class="last">In order to initialize the Forge class, your database
+driver must already be running, since the forge class relies on it.</p>
+</div>
+<p>Load the Forge Class as follows:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="p">()</span>
+</pre></div>
+</div>
+<p>You can also pass another database object to the DB Forge loader, in case
+the database you want to manage isn’t the default one:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">myforge</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">other_db</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>In the above example, we’re passing a custom database object as the first
+parameter and then tell it to return the dbforge object, instead of
+assigning it directly to <code class="docutils literal"><span class="pre">$this-&gt;dbforge</span></code>.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Both of the parameters can be used individually, just pass an empty
+value as the first one if you wish to skip it.</p>
+</div>
+<p>Once initialized you will access the methods using the <code class="docutils literal"><span class="pre">$this-&gt;dbforge</span></code>
+object:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">some_method</span><span class="p">();</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="creating-and-dropping-databases">
+<h2><a class="toc-backref" href="#id3">Creating and Dropping Databases</a><a class="headerlink" href="#creating-and-dropping-databases" title="Permalink to this headline">¶</a></h2>
+<p><strong>$this-&gt;dbforge-&gt;create_database(‘db_name’)</strong></p>
+<p>Permits you to create the database specified in the first parameter.
+Returns TRUE/FALSE based on success or failure:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">create_database</span><span class="p">(</span><span class="s1">&#39;my_db&#39;</span><span class="p">))</span>
+<span class="p">{</span>
+        <span class="k">echo</span> <span class="s1">&#39;Database created!&#39;</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p><strong>$this-&gt;dbforge-&gt;drop_database(‘db_name’)</strong></p>
+<p>Permits you to drop the database specified in the first parameter.
+Returns TRUE/FALSE based on success or failure:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">drop_database</span><span class="p">(</span><span class="s1">&#39;my_db&#39;</span><span class="p">))</span>
+<span class="p">{</span>
+        <span class="k">echo</span> <span class="s1">&#39;Database deleted!&#39;</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="creating-and-dropping-tables">
+<h2><a class="toc-backref" href="#id4">Creating and Dropping Tables</a><a class="headerlink" href="#creating-and-dropping-tables" title="Permalink to this headline">¶</a></h2>
+<p>There are several things you may wish to do when creating tables. Add
+fields, add keys to the table, alter columns. CodeIgniter provides a
+mechanism for this.</p>
+<div class="section" id="adding-fields">
+<h3><a class="toc-backref" href="#id5">Adding fields</a><a class="headerlink" href="#adding-fields" title="Permalink to this headline">¶</a></h3>
+<p>Fields are created via an associative array. Within the array you must
+include a ‘type’ key that relates to the datatype of the field. For
+example, INT, VARCHAR, TEXT, etc. Many datatypes (for example VARCHAR)
+also require a ‘constraint’ key.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;users&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;VARCHAR&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;100&#39;</span><span class="p">,</span>
+        <span class="p">),</span>
+<span class="p">);</span>
+<span class="c1">// will translate to &quot;users VARCHAR(100)&quot; when the field is added.</span>
+</pre></div>
+</div>
+<p>Additionally, the following key/values can be used:</p>
+<ul class="simple">
+<li>unsigned/true : to generate “UNSIGNED” in the field definition.</li>
+<li>default/value : to generate a default value in the field definition.</li>
+<li>null/true : to generate “NULL” in the field definition. Without this,
+the field will default to “NOT NULL”.</li>
+<li>auto_increment/true : generates an auto_increment flag on the
+field. Note that the field type must be a type that supports this,
+such as integer.</li>
+<li>unique/true : to generate a unique key for the field definition.</li>
+</ul>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;blog_id&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;INT&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="mi">5</span><span class="p">,</span>
+                <span class="s1">&#39;unsigned&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
+                <span class="s1">&#39;auto_increment&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span>
+        <span class="p">),</span>
+        <span class="s1">&#39;blog_title&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;VARCHAR&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;100&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;unique&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
+        <span class="p">),</span>
+        <span class="s1">&#39;blog_author&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span><span class="s1">&#39;VARCHAR&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;100&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;default&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;King of Town&#39;</span><span class="p">,</span>
+        <span class="p">),</span>
+        <span class="s1">&#39;blog_description&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;null&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
+        <span class="p">),</span>
+<span class="p">);</span>
+</pre></div>
+</div>
+<p>After the fields have been defined, they can be added using
+<code class="docutils literal"><span class="pre">$this-&gt;dbforge-&gt;add_field($fields);</span></code> followed by a call to the
+<code class="docutils literal"><span class="pre">create_table()</span></code> method.</p>
+<p><strong>$this-&gt;dbforge-&gt;add_field()</strong></p>
+<p>The add fields method will accept the above array.</p>
+<div class="section" id="passing-strings-as-fields">
+<h4>Passing strings as fields<a class="headerlink" href="#passing-strings-as-fields" title="Permalink to this headline">¶</a></h4>
+<p>If you know exactly how you want a field to be created, you can pass the
+string into the field definitions with add_field()</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_field</span><span class="p">(</span><span class="s2">&quot;label varchar(100) NOT NULL DEFAULT &#39;default label&#39;&quot;</span><span class="p">);</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Passing raw strings as fields cannot be followed by <code class="docutils literal"><span class="pre">add_key()</span></code> calls on those fields.</p>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Multiple calls to add_field() are cumulative.</p>
+</div>
+</div>
+<div class="section" id="creating-an-id-field">
+<h4>Creating an id field<a class="headerlink" href="#creating-an-id-field" title="Permalink to this headline">¶</a></h4>
+<p>There is a special exception for creating id fields. A field with type
+id will automatically be assigned as an INT(9) auto_incrementing
+Primary Key.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_field</span><span class="p">(</span><span class="s1">&#39;id&#39;</span><span class="p">);</span>
+<span class="c1">// gives id INT(9) NOT NULL AUTO_INCREMENT</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="adding-keys">
+<h3><a class="toc-backref" href="#id6">Adding Keys</a><a class="headerlink" href="#adding-keys" title="Permalink to this headline">¶</a></h3>
+<p>Generally speaking, you’ll want your table to have Keys. This is
+accomplished with $this-&gt;dbforge-&gt;add_key(‘field’). An optional second
+parameter set to TRUE will make it a primary key. Note that add_key()
+must be followed by a call to create_table().</p>
+<p>Multiple column non-primary keys must be sent as an array. Sample output
+below is for MySQL.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_key</span><span class="p">(</span><span class="s1">&#39;blog_id&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+<span class="c1">// gives PRIMARY KEY `blog_id` (`blog_id`)</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_key</span><span class="p">(</span><span class="s1">&#39;blog_id&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_key</span><span class="p">(</span><span class="s1">&#39;site_id&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+<span class="c1">// gives PRIMARY KEY `blog_id_site_id` (`blog_id`, `site_id`)</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_key</span><span class="p">(</span><span class="s1">&#39;blog_name&#39;</span><span class="p">);</span>
+<span class="c1">// gives KEY `blog_name` (`blog_name`)</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_key</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;blog_name&#39;</span><span class="p">,</span> <span class="s1">&#39;blog_label&#39;</span><span class="p">));</span>
+<span class="c1">// gives KEY `blog_name_blog_label` (`blog_name`, `blog_label`)</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="creating-a-table">
+<h3><a class="toc-backref" href="#id7">Creating a table</a><a class="headerlink" href="#creating-a-table" title="Permalink to this headline">¶</a></h3>
+<p>After fields and keys have been declared, you can create a new table
+with</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">create_table</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>
+<span class="c1">// gives CREATE TABLE table_name</span>
+</pre></div>
+</div>
+<p>An optional second parameter set to TRUE adds an “IF NOT EXISTS” clause
+into the definition</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">create_table</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span>
+<span class="c1">// gives CREATE TABLE IF NOT EXISTS table_name</span>
+</pre></div>
+</div>
+<p>You could also pass optional table attributes, such as MySQL’s <code class="docutils literal"><span class="pre">ENGINE</span></code>:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$attributes</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;ENGINE&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;InnoDB&#39;</span><span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">create_table</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="k">FALSE</span><span class="p">,</span> <span class="nv">$attributes</span><span class="p">);</span>
+<span class="c1">// produces: CREATE TABLE `table_name` (...) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Unless you specify the <code class="docutils literal"><span class="pre">CHARACTER</span> <span class="pre">SET</span></code> and/or <code class="docutils literal"><span class="pre">COLLATE</span></code> attributes,
+<code class="docutils literal"><span class="pre">create_table()</span></code> will always add them with your configured <em>char_set</em>
+and <em>dbcollat</em> values, as long as they are not empty (MySQL only).</p>
+</div>
+</div>
+<div class="section" id="dropping-a-table">
+<h3><a class="toc-backref" href="#id8">Dropping a table</a><a class="headerlink" href="#dropping-a-table" title="Permalink to this headline">¶</a></h3>
+<p>Execute a DROP TABLE statement and optionally add an IF EXISTS clause.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Produces: DROP TABLE table_name</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">drop_table</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">);</span>
+
+<span class="c1">// Produces: DROP TABLE IF EXISTS table_name</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">drop_table</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span><span class="k">TRUE</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="renaming-a-table">
+<h3><a class="toc-backref" href="#id9">Renaming a table</a><a class="headerlink" href="#renaming-a-table" title="Permalink to this headline">¶</a></h3>
+<p>Executes a TABLE rename</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">rename_table</span><span class="p">(</span><span class="s1">&#39;old_table_name&#39;</span><span class="p">,</span> <span class="s1">&#39;new_table_name&#39;</span><span class="p">);</span>
+<span class="c1">// gives ALTER TABLE old_table_name RENAME TO new_table_name</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="modifying-tables">
+<h2><a class="toc-backref" href="#id10">Modifying Tables</a><a class="headerlink" href="#modifying-tables" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="adding-a-column-to-a-table">
+<h3><a class="toc-backref" href="#id11">Adding a Column to a Table</a><a class="headerlink" href="#adding-a-column-to-a-table" title="Permalink to this headline">¶</a></h3>
+<p><strong>$this-&gt;dbforge-&gt;add_column()</strong></p>
+<p>The <code class="docutils literal"><span class="pre">add_column()</span></code> method is used to modify an existing table. It
+accepts the same field array as above, and can be used for an unlimited
+number of additional fields.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;preferences&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">)</span>
+<span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_column</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="nv">$fields</span><span class="p">);</span>
+<span class="c1">// Executes: ALTER TABLE table_name ADD preferences TEXT</span>
+</pre></div>
+</div>
+<p>If you are using MySQL or CUBIRD, then you can take advantage of their
+AFTER and FIRST clauses to position the new column.</p>
+<p>Examples:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Will place the new column after the `another_field` column:</span>
+<span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;preferences&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">,</span> <span class="s1">&#39;after&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;another_field&#39;</span><span class="p">)</span>
+<span class="p">);</span>
+
+<span class="c1">// Will place the new column at the start of the table definition:</span>
+<span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;preferences&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">,</span> <span class="s1">&#39;first&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">)</span>
+<span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="dropping-a-column-from-a-table">
+<h3><a class="toc-backref" href="#id12">Dropping a Column From a Table</a><a class="headerlink" href="#dropping-a-column-from-a-table" title="Permalink to this headline">¶</a></h3>
+<p><strong>$this-&gt;dbforge-&gt;drop_column()</strong></p>
+<p>Used to remove a column from a table.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">drop_column</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="s1">&#39;column_to_drop&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="modifying-a-column-in-a-table">
+<h3><a class="toc-backref" href="#id13">Modifying a Column in a Table</a><a class="headerlink" href="#modifying-a-column-in-a-table" title="Permalink to this headline">¶</a></h3>
+<p><strong>$this-&gt;dbforge-&gt;modify_column()</strong></p>
+<p>The usage of this method is identical to <code class="docutils literal"><span class="pre">add_column()</span></code>, except it
+alters an existing column rather than adding a new one. In order to
+change the name you can add a “name” key into the field defining array.</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+        <span class="s1">&#39;old_name&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
+                <span class="s1">&#39;name&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;new_name&#39;</span><span class="p">,</span>
+                <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">,</span>
+        <span class="p">),</span>
+<span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">modify_column</span><span class="p">(</span><span class="s1">&#39;table_name&#39;</span><span class="p">,</span> <span class="nv">$fields</span><span class="p">);</span>
+<span class="c1">// gives ALTER TABLE table_name CHANGE old_name new_name TEXT</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="class-reference">
+<h2><a class="toc-backref" href="#id14">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
+<dl class="class">
+<dt id="CI_DB_forge">
+<em class="property">class </em><code class="descname">CI_DB_forge</code><a class="headerlink" href="#CI_DB_forge" title="Permalink to this definition">¶</a></dt>
+<dd><dl class="method">
+<dt id="CI_DB_forge::add_column">
+<code class="descname">add_column</code><span class="sig-paren">(</span><em>$table</em><span class="optional">[</span>, <em>$field = array()</em><span class="optional">[</span>, <em>$_after = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_column" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Table name to add the column to</li>
+<li><strong>$field</strong> (<em>array</em>) – Column definition(s)</li>
+<li><strong>$_after</strong> (<em>string</em>) – Column for AFTER clause (deprecated)</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Adds a column to a table. Usage:  See <a class="reference internal" href="#adding-a-column-to-a-table">Adding a Column to a Table</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::add_field">
+<code class="descname">add_field</code><span class="sig-paren">(</span><em>$field</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_field" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$field</strong> (<em>array</em>) – Field definition to add</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_DB_forge instance (method chaining)</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_DB_forge</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Adds a field to the set that will be used to create a table. Usage:  See <a class="reference internal" href="#adding-fields">Adding fields</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::add_key">
+<code class="descname">add_key</code><span class="sig-paren">(</span><em>$key</em><span class="optional">[</span>, <em>$primary = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::add_key" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$key</strong> (<em>array</em>) – Name of a key field</li>
+<li><strong>$primary</strong> (<em>bool</em>) – Set to TRUE if it should be a primary key or a regular one</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">CI_DB_forge instance (method chaining)</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">CI_DB_forge</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Adds a key to the set that will be used to create a table. Usage:  See <a class="reference internal" href="#adding-keys">Adding Keys</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::create_database">
+<code class="descname">create_database</code><span class="sig-paren">(</span><em>$db_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::create_database" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$db_name</strong> (<em>string</em>) – Name of the database to create</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Creates a new database. Usage:  See <a class="reference internal" href="#creating-and-dropping-databases">Creating and Dropping Databases</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::create_table">
+<code class="descname">create_table</code><span class="sig-paren">(</span><em>$table</em><span class="optional">[</span>, <em>$if_not_exists = FALSE</em><span class="optional">[</span>, <em>array $attributes = array()</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::create_table" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Name of the table to create</li>
+<li><strong>$if_not_exists</strong> (<em>string</em>) – Set to TRUE to add an ‘IF NOT EXISTS’ clause</li>
+<li><strong>$attributes</strong> (<em>string</em>) – An associative array of table attributes</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Creates a new table. Usage:  See <a class="reference internal" href="#creating-a-table">Creating a table</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::drop_column">
+<code class="descname">drop_column</code><span class="sig-paren">(</span><em>$table</em>, <em>$column_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_column" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Table name</li>
+<li><strong>$column_name</strong> (<em>array</em>) – The column name to drop</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Drops a column from a table. Usage:  See <a class="reference internal" href="#dropping-a-column-from-a-table">Dropping a Column From a Table</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::drop_database">
+<code class="descname">drop_database</code><span class="sig-paren">(</span><em>$db_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_database" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$db_name</strong> (<em>string</em>) – Name of the database to drop</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Drops a database. Usage:  See <a class="reference internal" href="#creating-and-dropping-databases">Creating and Dropping Databases</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::drop_table">
+<code class="descname">drop_table</code><span class="sig-paren">(</span><em>$table_name</em><span class="optional">[</span>, <em>$if_exists = FALSE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::drop_table" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Name of the table to drop</li>
+<li><strong>$if_exists</strong> (<em>string</em>) – Set to TRUE to add an ‘IF EXISTS’ clause</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Drops a table. Usage:  See <a class="reference internal" href="#dropping-a-table">Dropping a table</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::modify_column">
+<code class="descname">modify_column</code><span class="sig-paren">(</span><em>$table</em>, <em>$field</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::modify_column" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Table name</li>
+<li><strong>$field</strong> (<em>array</em>) – Column definition(s)</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Modifies a table column. Usage:  See <a class="reference internal" href="#modifying-a-column-in-a-table">Modifying a Column in a Table</a>.</p>
+</dd></dl>
+
+<dl class="method">
+<dt id="CI_DB_forge::rename_table">
+<code class="descname">rename_table</code><span class="sig-paren">(</span><em>$table_name</em>, <em>$new_table_name</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_DB_forge::rename_table" title="Permalink to this definition">¶</a></dt>
+<dd><table class="docutils field-list" frame="void" rules="none">
+<col class="field-name" />
+<col class="field-body" />
+<tbody valign="top">
+<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
+<li><strong>$table</strong> (<em>string</em>) – Current of the table</li>
+<li><strong>$new_table_name</strong> (<em>string</em>) – New name of the table</li>
+</ul>
+</td>
+</tr>
+<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
+</td>
+</tr>
+<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
+</td>
+</tr>
+</tbody>
+</table>
+<p>Renames a table. Usage:  See <a class="reference internal" href="#renaming-a-table">Renaming a table</a>.</p>
+</dd></dl>
+
+</dd></dl>
+
+</div>
+</div>
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