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| author | Andrey Andreev <narf@devilix.net> | 2018-06-12 15:45:46 +0200 |
|---|---|---|
| committer | Andrey Andreev <narf@devilix.net> | 2018-06-12 15:45:46 +0200 |
| commit | 30e2eafa86c4c7b6b39cea3e7089a90df9f603fb (patch) | |
| tree | 391bc1e62d8d0ad045e18a6da72e3e2a59e91503 /user_guide/database/forge.html | |
| parent | a9da3dd2f16a8f97d7bc4ff5572b28e4bb84c813 (diff) | |
[ci skip] 3.1.9 release
Diffstat (limited to 'user_guide/database/forge.html')
| -rw-r--r-- | user_guide/database/forge.html | 1034 |
1 files changed, 1034 insertions, 0 deletions
diff --git a/user_guide/database/forge.html b/user_guide/database/forge.html new file mode 100644 index 000000000..a4f065bbf --- /dev/null +++ b/user_guide/database/forge.html @@ -0,0 +1,1034 @@ + + +<!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>Database Forge Class — CodeIgniter 3.1.9 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" title="Search" 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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 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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> + + </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">Database Reference</a> »</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">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">dbforge</span><span class="p">()</span> +</pre></div> +</div> +<p>You can also pass another database object to the DB Forge loader, in case +the database you want to manage isn’t the default one:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">myforge</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-></span><span class="na">load</span><span class="o">-></span><span class="na">dbforge</span><span class="p">(</span><span class="nv">$this</span><span class="o">-></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">$this->dbforge</span></code>.</p> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Both of the parameters can be used individually, just pass an empty +value as the first one if you wish to skip it.</p> +</div> +<p>Once initialized you will access the methods using the <code class="docutils literal"><span class="pre">$this->dbforge</span></code> +object:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">some_method</span><span class="p">();</span> +</pre></div> +</div> +</div> +<div class="section" id="creating-and-dropping-databases"> +<h2><a class="toc-backref" href="#id3">Creating and Dropping Databases</a><a class="headerlink" href="#creating-and-dropping-databases" title="Permalink to this headline">¶</a></h2> +<p><strong>$this->dbforge->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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_database</span><span class="p">(</span><span class="s1">'my_db'</span><span class="p">))</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="s1">'Database created!'</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +<p><strong>$this->dbforge->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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_database</span><span class="p">(</span><span class="s1">'my_db'</span><span class="p">))</span> +<span class="p">{</span> + <span class="k">echo</span> <span class="s1">'Database deleted!'</span><span class="p">;</span> +<span class="p">}</span> +</pre></div> +</div> +</div> +<div class="section" id="creating-and-dropping-tables"> +<h2><a class="toc-backref" href="#id4">Creating and Dropping Tables</a><a class="headerlink" href="#creating-and-dropping-tables" title="Permalink to this headline">¶</a></h2> +<p>There are several things you may wish to do when creating tables. Add +fields, add keys to the table, alter columns. CodeIgniter provides a +mechanism for this.</p> +<div class="section" id="adding-fields"> +<h3><a class="toc-backref" href="#id5">Adding fields</a><a class="headerlink" href="#adding-fields" title="Permalink to this headline">¶</a></h3> +<p>Fields are created via an associative array. Within the array you must +include a ‘type’ key that relates to the datatype of the field. For +example, INT, VARCHAR, TEXT, etc. Many datatypes (for example VARCHAR) +also require a ‘constraint’ key.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'users'</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="p">);</span> +<span class="c1">// will translate to "users VARCHAR(100)" 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">'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="s1">'unique'</span> <span class="o">=></span> <span class="k">TRUE</span><span class="p">,</span> + <span class="p">),</span> + <span class="s1">'blog_author'</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="s1">'default'</span> <span class="o">=></span> <span class="s1">'King of Town'</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> +</pre></div> +</div> +<p>After the fields have been defined, they can be added using +<code class="docutils literal"><span class="pre">$this->dbforge->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->dbforge->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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="s2">"label varchar(100) NOT NULL DEFAULT 'default label'"</span><span class="p">);</span> +</pre></div> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Passing raw strings as fields cannot be followed by <code class="docutils literal"><span class="pre">add_key()</span></code> calls on those fields.</p> +</div> +<div class="admonition note"> +<p class="first admonition-title">Note</p> +<p class="last">Multiple calls to add_field() are cumulative.</p> +</div> +</div> +<div class="section" id="creating-an-id-field"> +<h4>Creating an id field<a class="headerlink" href="#creating-an-id-field" title="Permalink to this headline">¶</a></h4> +<p>There is a special exception for creating id fields. A field with type +id will automatically be assigned as an INT(9) auto_incrementing +Primary Key.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="s1">'id'</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 $this->dbforge->add_key(‘field’). An optional second +parameter set to TRUE will make it a primary key. Note that add_key() +must be followed by a call to create_table().</p> +<p>Multiple column non-primary keys must be sent as an array. Sample output +below is for MySQL.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></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="c1">// gives PRIMARY KEY `blog_id` (`blog_id`)</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">add_key</span><span class="p">(</span><span class="s1">'site_id'</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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_key</span><span class="p">(</span><span class="s1">'blog_name'</span><span class="p">);</span> +<span class="c1">// gives KEY `blog_name` (`blog_name`)</span> + +<span class="nv">$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="k">array</span><span class="p">(</span><span class="s1">'blog_name'</span><span class="p">,</span> <span class="s1">'blog_label'</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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> +<span class="c1">// gives CREATE TABLE table_name</span> +</pre></div> +</div> +<p>An optional second parameter set to TRUE adds an “IF NOT EXISTS” clause +into the definition</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">create_table</span><span class="p">(</span><span class="s1">'table_name'</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">$attributes</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">'ENGINE'</span> <span class="o">=></span> <span class="s1">'InnoDB'</span><span class="p">);</span> +<span class="nv">$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">'table_name'</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">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">);</span> + +<span class="c1">// Produces: DROP TABLE IF EXISTS table_name</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_table</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span><span class="k">TRUE</span><span class="p">);</span> +</pre></div> +</div> +</div> +<div class="section" id="renaming-a-table"> +<h3><a class="toc-backref" href="#id9">Renaming a table</a><a class="headerlink" href="#renaming-a-table" title="Permalink to this headline">¶</a></h3> +<p>Executes a TABLE rename</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">rename_table</span><span class="p">(</span><span class="s1">'old_table_name'</span><span class="p">,</span> <span class="s1">'new_table_name'</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>$this->dbforge->add_column()</strong></p> +<p>The <code class="docutils literal"><span class="pre">add_column()</span></code> method is used to modify an existing table. It +accepts the same field array as above, and can be used for an unlimited +number of additional fields.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'preferences'</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="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$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">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'preferences'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'type'</span> <span class="o">=></span> <span class="s1">'TEXT'</span><span class="p">,</span> <span class="s1">'after'</span> <span class="o">=></span> <span class="s1">'another_field'</span><span class="p">)</span> +<span class="p">);</span> + +<span class="c1">// Will place the new column at the start of the table definition:</span> +<span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'preferences'</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">'first'</span> <span class="o">=></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>$this->dbforge->drop_column()</strong></p> +<p>Used to remove a column from a table.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">drop_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="s1">'column_to_drop'</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>$this->dbforge->modify_column()</strong></p> +<p>The usage of this method is identical to <code class="docutils literal"><span class="pre">add_column()</span></code>, except it +alters an existing column rather than adding a new one. In order to +change the name you can add a “name” key into the field defining array.</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$fields</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'old_name'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'name'</span> <span class="o">=></span> <span class="s1">'new_name'</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="p">),</span> +<span class="p">);</span> +<span class="nv">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">modify_column</span><span class="p">(</span><span class="s1">'table_name'</span><span class="p">,</span> <span class="nv">$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> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="utilities.html" class="btn btn-neutral float-right" title="Database Utility Class">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="caching.html" class="btn btn-neutral" title="Database Caching 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 Jun 12, 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:'3.1.9', + 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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