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- <div class="section" id="migrations-class">
-<h1>Migrations Class<a class="headerlink" href="#migrations-class" title="Permalink to this headline">¶</a></h1>
-<p>Migrations are a convenient way for you to alter your database in a
-structured and organized manner. You could edit fragments of SQL by hand
-but you would then be responsible for telling other developers that they
-need to go and run them. You would also have to keep track of which changes
-need to be run against the production machines next time you deploy.</p>
-<p>The database table <strong>migration</strong> tracks which migrations have already been
-run so all you have to do is update your application files and
-call <code class="docutils literal"><span class="pre">$this-&gt;migration-&gt;current()</span></code> to work out which migrations should be run.
-The current version is found in <strong>application/config/migration.php</strong>.</p>
-<div class="contents local topic" id="contents">
-<ul class="simple">
-<li><a class="reference internal" href="#migration-file-names" id="id1">Migration file names</a></li>
-<li><a class="reference internal" href="#create-a-migration" id="id2">Create a Migration</a></li>
-<li><a class="reference internal" href="#usage-example" id="id3">Usage Example</a></li>
-<li><a class="reference internal" href="#migration-preferences" id="id4">Migration Preferences</a></li>
-<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li>
-</ul>
-</div>
-<div class="custom-index container"></div><div class="section" id="migration-file-names">
-<h2><a class="toc-backref" href="#id1">Migration file names</a><a class="headerlink" href="#migration-file-names" title="Permalink to this headline">¶</a></h2>
-<p>Each Migration is run in numeric order forward or backwards depending on the
-method taken. Two numbering styles are available:</p>
-<ul class="simple">
-<li><strong>Sequential:</strong> each migration is numbered in sequence, starting with <strong>001</strong>.
-Each number must be three digits, and there must not be any gaps in the
-sequence. (This was the numbering scheme prior to CodeIgniter 3.0.)</li>
-<li><strong>Timestamp:</strong> each migration is numbered using the timestamp when the migration
-was created, in <strong>YYYYMMDDHHIISS</strong> format (e.g. <strong>20121031100537</strong>). This
-helps prevent numbering conflicts when working in a team environment, and is
-the preferred scheme in CodeIgniter 3.0 and later.</li>
-</ul>
-<p>The desired style may be selected using the <code class="docutils literal"><span class="pre">$config['migration_type']</span></code>
-setting in your <em>application/config/migration.php</em> file.</p>
-<p>Regardless of which numbering style you choose to use, prefix your migration
-files with the migration number followed by an underscore and a descriptive
-name for the migration. For example:</p>
-<ul class="simple">
-<li>001_add_blog.php (sequential numbering)</li>
-<li>20121031100537_add_blog.php (timestamp numbering)</li>
-</ul>
-</div>
-<div class="section" id="create-a-migration">
-<h2><a class="toc-backref" href="#id2">Create a Migration</a><a class="headerlink" href="#create-a-migration" title="Permalink to this headline">¶</a></h2>
-<p>This will be the first migration for a new site which has a blog. All
-migrations go in the <strong>application/migrations/</strong> directory and have names such
-as <em>20121031100537_add_blog.php</em>.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
-
-<span class="nb">defined</span><span class="p">(</span><span class="s1">&#39;BASEPATH&#39;</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">&#39;No direct script access allowed&#39;</span><span class="p">);</span>
-
-<span class="k">class</span> <span class="nc">Migration_Add_blog</span> <span class="k">extends</span> <span class="nx">CI_Migration</span> <span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">up</span><span class="p">()</span>
- <span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">add_field</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;blog_id&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;INT&#39;</span><span class="p">,</span>
- <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="mi">5</span><span class="p">,</span>
- <span class="s1">&#39;unsigned&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
- <span class="s1">&#39;auto_increment&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span>
- <span class="p">),</span>
- <span class="s1">&#39;blog_title&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;VARCHAR&#39;</span><span class="p">,</span>
- <span class="s1">&#39;constraint&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;100&#39;</span><span class="p">,</span>
- <span class="p">),</span>
- <span class="s1">&#39;blog_description&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span>
- <span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;TEXT&#39;</span><span class="p">,</span>
- <span class="s1">&#39;null&#39;</span> <span class="o">=&gt;</span> <span class="k">TRUE</span><span class="p">,</span>
- <span class="p">),</span>
- <span class="p">));</span>
- <span class="nv">$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">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">create_table</span><span class="p">(</span><span class="s1">&#39;blog&#39;</span><span class="p">);</span>
- <span class="p">}</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">down</span><span class="p">()</span>
- <span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">dbforge</span><span class="o">-&gt;</span><span class="na">drop_table</span><span class="p">(</span><span class="s1">&#39;blog&#39;</span><span class="p">);</span>
- <span class="p">}</span>
-<span class="p">}</span>
-</pre></div>
-</div>
-<p>Then in <strong>application/config/migration.php</strong> set <code class="docutils literal"><span class="pre">$config['migration_version']</span> <span class="pre">=</span> <span class="pre">20121031100537;</span></code>.</p>
-</div>
-<div class="section" id="usage-example">
-<h2><a class="toc-backref" href="#id3">Usage Example</a><a class="headerlink" href="#usage-example" title="Permalink to this headline">¶</a></h2>
-<p>In this example some simple code is placed in <strong>application/controllers/Migrate.php</strong>
-to update the schema.:</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
-
-<span class="k">class</span> <span class="nc">Migrate</span> <span class="k">extends</span> <span class="nx">CI_Controller</span>
-<span class="p">{</span>
-
- <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
- <span class="p">{</span>
- <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;migration&#39;</span><span class="p">);</span>
-
- <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">migration</span><span class="o">-&gt;</span><span class="na">current</span><span class="p">()</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span>
- <span class="p">{</span>
- <span class="nx">show_error</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">migration</span><span class="o">-&gt;</span><span class="na">error_string</span><span class="p">());</span>
- <span class="p">}</span>
- <span class="p">}</span>
-
-<span class="p">}</span>
-</pre></div>
-</div>
-</div>
-<div class="section" id="migration-preferences">
-<h2><a class="toc-backref" href="#id4">Migration Preferences</a><a class="headerlink" href="#migration-preferences" title="Permalink to this headline">¶</a></h2>
-<p>The following is a table of all the config options for migrations.</p>
-<table border="1" class="docutils">
-<colgroup>
-<col width="22%" />
-<col width="18%" />
-<col width="22%" />
-<col width="38%" />
-</colgroup>
-<thead valign="bottom">
-<tr class="row-odd"><th class="head">Preference</th>
-<th class="head">Default</th>
-<th class="head">Options</th>
-<th class="head">Description</th>
-</tr>
-</thead>
-<tbody valign="top">
-<tr class="row-even"><td><strong>migration_enabled</strong></td>
-<td>FALSE</td>
-<td>TRUE / FALSE</td>
-<td>Enable or disable migrations.</td>
-</tr>
-<tr class="row-odd"><td><strong>migration_path</strong></td>
-<td>APPPATH.’migrations/’</td>
-<td>None</td>
-<td>The path to your migrations folder.</td>
-</tr>
-<tr class="row-even"><td><strong>migration_version</strong></td>
-<td>0</td>
-<td>None</td>
-<td>The current version your database should use.</td>
-</tr>
-<tr class="row-odd"><td><strong>migration_table</strong></td>
-<td>migrations</td>
-<td>None</td>
-<td>The table name for storing the schema
-version number.</td>
-</tr>
-<tr class="row-even"><td><strong>migration_auto_latest</strong></td>
-<td>FALSE</td>
-<td>TRUE / FALSE</td>
-<td>Enable or disable automatically
-running migrations.</td>
-</tr>
-<tr class="row-odd"><td><strong>migration_type</strong></td>
-<td>‘timestamp’</td>
-<td>‘timestamp’ / ‘sequential’</td>
-<td>The type of numeric identifier used to name
-migration files.</td>
-</tr>
-</tbody>
-</table>
-</div>
-<div class="section" id="class-reference">
-<h2><a class="toc-backref" href="#id5">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
-<dl class="class">
-<dt id="CI_Migration">
-<em class="property">class </em><code class="descname">CI_Migration</code><a class="headerlink" href="#CI_Migration" title="Permalink to this definition">¶</a></dt>
-<dd><dl class="method">
-<dt id="CI_Migration::current">
-<code class="descname">current</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Migration::current" 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">Returns:</th><td class="field-body">TRUE if no migrations are found, current version string on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
-</tr>
-</tbody>
-</table>
-<p>Migrates up to the current version (whatever is set for
-<code class="docutils literal"><span class="pre">$config['migration_version']</span></code> in <em>application/config/migration.php</em>).</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Migration::error_string">
-<code class="descname">error_string</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Migration::error_string" 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">Returns:</th><td class="field-body">Error messages</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">string</td>
-</tr>
-</tbody>
-</table>
-<p>This returns a string of errors that were detected while performing a migration.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Migration::find_migrations">
-<code class="descname">find_migrations</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Migration::find_migrations" 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">Returns:</th><td class="field-body">An array of migration files</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">array</td>
-</tr>
-</tbody>
-</table>
-<p>An array of migration filenames are returned that are found in the <strong>migration_path</strong> property.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Migration::latest">
-<code class="descname">latest</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Migration::latest" 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">Returns:</th><td class="field-body">Current version string on success, FALSE on failure</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
-</tr>
-</tbody>
-</table>
-<p>This works much the same way as <code class="docutils literal"><span class="pre">current()</span></code> but instead of looking for
-the <code class="docutils literal"><span class="pre">$config['migration_version']</span></code> the Migration class will use the very
-newest migration found in the filesystem.</p>
-</dd></dl>
-
-<dl class="method">
-<dt id="CI_Migration::version">
-<code class="descname">version</code><span class="sig-paren">(</span><em>$target_version</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Migration::version" title="Permalink to this definition">¶</a></dt>
-<dd><table class="docutils field-list" frame="void" rules="none">
-<col class="field-name" />
-<col class="field-body" />
-<tbody valign="top">
-<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
-<li><strong>$target_version</strong> (<em>mixed</em>) – Migration version to process</li>
-</ul>
-</td>
-</tr>
-<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if no migrations are found, current version string 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">mixed</p>
-</td>
-</tr>
-</tbody>
-</table>
-<p>Version can be used to roll back changes or step forwards programmatically to
-specific versions. It works just like <code class="docutils literal"><span class="pre">current()</span></code> but ignores <code class="docutils literal"><span class="pre">$config['migration_version']</span></code>.</p>
-<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">migration</span><span class="o">-&gt;</span><span class="na">version</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
-</pre></div>
-</div>
-</dd></dl>
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