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| author | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-03-22 15:48:55 +0100 |
| commit | 71e647782764184e3aab4faffe6d99176758979f (patch) | |
| tree | 74dbdd50a61cd5674915c144aca9ebbc00b235b8 /user_guide/libraries/migration.html | |
| parent | b12fbad77bd69ca0c7624a9094c29b7691ea6107 (diff) | |
[ci skip] 3.1.8 release
Diffstat (limited to 'user_guide/libraries/migration.html')
| -rw-r--r-- | user_guide/libraries/migration.html | 758 |
1 files changed, 758 insertions, 0 deletions
diff --git a/user_guide/libraries/migration.html b/user_guide/libraries/migration.html new file mode 100644 index 000000000..3ae1c92f3 --- /dev/null +++ b/user_guide/libraries/migration.html @@ -0,0 +1,758 @@ + + +<!DOCTYPE html> +<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]--> +<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]--> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + + <title>Migrations Class — CodeIgniter 3.1.8 documentation</title> + + + + + <link rel="shortcut icon" href="../_static/ci-icon.ico"/> + + + + <link href='https://fonts.googleapis.com/css?family=Lato:400,700,400italic,700italic|Roboto+Slab:400,700|Inconsolata:400,700&subset=latin,cyrillic' rel='stylesheet' type='text/css'> + + + + + + + + + + <link rel="stylesheet" href="../_static/css/citheme.css" type="text/css" /> + + + + <link rel="index" title="Index" + href="../genindex.html"/> + <link rel="search" 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class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li> +</ul> +</li> +</ul> + + + + </div> + + </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> »</li> + + <li><a href="index.html">Libraries</a> »</li> + + <li>Migrations 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="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">$this->migration->current()</span></code> to work out which migrations should be run. +The current version is found in <strong>application/config/migration.php</strong>.</p> +<div class="contents local topic" id="contents"> +<ul class="simple"> +<li><a class="reference internal" href="#migration-file-names" id="id1">Migration file names</a></li> +<li><a class="reference internal" href="#create-a-migration" id="id2">Create a Migration</a></li> +<li><a class="reference internal" href="#usage-example" id="id3">Usage Example</a></li> +<li><a class="reference internal" href="#migration-preferences" id="id4">Migration Preferences</a></li> +<li><a class="reference internal" href="#class-reference" id="id5">Class Reference</a></li> +</ul> +</div> +<div class="custom-index container"></div><div class="section" id="migration-file-names"> +<h2><a class="toc-backref" href="#id1">Migration file names</a><a class="headerlink" href="#migration-file-names" title="Permalink to this headline">¶</a></h2> +<p>Each Migration is run in numeric order forward or backwards depending on the +method taken. Two numbering styles are available:</p> +<ul class="simple"> +<li><strong>Sequential:</strong> each migration is numbered in sequence, starting with <strong>001</strong>. +Each number must be three digits, and there must not be any gaps in the +sequence. (This was the numbering scheme prior to CodeIgniter 3.0.)</li> +<li><strong>Timestamp:</strong> each migration is numbered using the timestamp when the migration +was created, in <strong>YYYYMMDDHHIISS</strong> format (e.g. <strong>20121031100537</strong>). This +helps prevent numbering conflicts when working in a team environment, and is +the preferred scheme in CodeIgniter 3.0 and later.</li> +</ul> +<p>The desired style may be selected using the <code class="docutils literal"><span class="pre">$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"><?</span><span class="nx">php</span> + +<span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="k">array</span><span class="p">(</span> + <span class="s1">'blog_id'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'INT'</span><span class="p">,</span> + <span class="s1">'constraint'</span> <span class="o">=></span> <span class="mi">5</span><span class="p">,</span> + <span class="s1">'unsigned'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span> + <span class="s1">'auto_increment'</span> <span class="o">=></span> <span class="k">TRUE</span> + <span class="p">),</span> + <span class="s1">'blog_title'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'VARCHAR'</span><span class="p">,</span> + <span class="s1">'constraint'</span> <span class="o">=></span> <span class="s1">'100'</span><span class="p">,</span> + <span class="p">),</span> + <span class="s1">'blog_description'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span> + <span class="s1">'null'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span> + <span class="p">),</span> + <span class="p">));</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'blog_id'</span><span class="p">,</span> <span class="k">TRUE</span><span class="p">);</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'blog'</span><span class="p">);</span> + <span class="p">}</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">down</span><span class="p">()</span> + <span class="p">{</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_table</span><span class="p">(</span><span class="s1">'blog'</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">$config['migration_version']</span> <span class="pre">=</span> <span class="pre">20121031100537;</span></code>.</p> +</div> +<div class="section" id="usage-example"> +<h2><a class="toc-backref" href="#id3">Usage Example</a><a class="headerlink" href="#usage-example" title="Permalink to this headline">¶</a></h2> +<p>In this example some simple code is placed in <strong>application/controllers/Migrate.php</strong> +to update the schema.:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> + +<span class="k">class</span> <span class="nc">Migrate</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> +<span class="p">{</span> + + <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span> + <span class="p">{</span> + <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">library</span><span class="p">(</span><span class="s1">'migration'</span><span class="p">);</span> + + <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">migration</span><span class="o">-></span><span class="na">current</span><span class="p">()</span> <span class="o">===</span> <span class="k">FALSE</span><span class="p">)</span> + <span class="p">{</span> + <span class="nx">show_error</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></span><span class="na">migration</span><span class="o">-></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">-></span><span class="na">migration</span><span class="o">-></span><span class="na">version</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span> +</pre></div> +</div> +</dd></dl> + +</dd></dl> + +</div> +</div> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="output.html" class="btn btn-neutral float-right" title="Output Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="loader.html" class="btn btn-neutral" title="Loader Class"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Mar 22, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.8', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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