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<!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 3.1.5 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="top" title="CodeIgniter 3.1.5 documentation" href="../index.html"/> <link rel="up" title="Database Reference" href="index.html"/> <link rel="next" title="Database Utility Class" href="utilities.html"/> <link rel="prev" title="Database Caching Class" href="caching.html"/> <script 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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 <tt class="docutils literal"><span class="pre">$this->dbforge</span></tt>.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Both of the parameters can be used individually, just pass an empty value as the first one if you wish to skip it.</p> </div> <p>Once initialized you will access the methods using the <tt class="docutils literal"><span class="pre">$this->dbforge</span></tt> 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 <tt class="docutils literal"><span class="pre">$this->dbforge->add_field($fields);</span></tt> followed by a call to the <tt class="docutils literal"><span class="pre">create_table()</span></tt> method.</p> <p><strong>$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">$this</span><span class="o">-></span><span class="na">dbforge</span><span class="o">-></span><span class="na">add_field</span><span class="p">(</span><span class="s2">"label varchar(100) NOT NULL DEFAULT 'default label'"</span><span class="p">);</span> </pre></div> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Passing raw strings as fields cannot be followed by <tt class="docutils literal"><span class="pre">add_key()</span></tt> calls on those fields.</p> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Multiple calls to add_field() are cumulative.</p> </div> </div> <div class="section" id="creating-an-id-field"> <h4>Creating an id field<a class="headerlink" href="#creating-an-id-field" title="Permalink to this headline">¶</a></h4> <p>There is a special exception for creating id fields. A field with type id will automatically be assigned as an INT(9) auto_incrementing Primary Key.</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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 <tt class="docutils literal"><span class="pre">ENGINE</span></tt>:</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">$attributes</span><span class="p">);</span> <span class="c1">// produces: CREATE TABLE `table_name` (...) ENGINE = InnoDB DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci</span> </pre></div> </div> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Unless you specify the <tt class="docutils literal"><span class="pre">CHARACTER</span> <span class="pre">SET</span></tt> and/or <tt class="docutils literal"><span class="pre">COLLATE</span></tt> attributes, <tt class="docutils literal"><span class="pre">create_table()</span></tt> will always add them with your configured <em>char_set</em> and <em>dbcollat</em> values, as long as they are not empty (MySQL only).</p> </div> </div> <div class="section" id="dropping-a-table"> <h3><a class="toc-backref" href="#id8">Dropping a table</a><a class="headerlink" href="#dropping-a-table" title="Permalink to this headline">¶</a></h3> <p>Execute a DROP TABLE statement and optionally add an IF EXISTS clause.</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// Produces: DROP TABLE table_name</span> <span class="nv">$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>$this->dbforge->add_column()</strong></p> <p>The <tt class="docutils literal"><span class="pre">add_column()</span></tt> method is used to modify an existing table. It accepts the same field array as above, and can be used for an unlimited number of additional fields.</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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>$this->dbforge->modify_column()</strong></p> <p>The usage of this method is identical to <tt class="docutils literal"><span class="pre">add_column()</span></tt>, except it alters an existing column rather than adding a new one. In order to change the name you can add a “name” key into the field defining array.</p> <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$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><tt class="descname">CI_DB_forge</tt><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"> <tt class="descname">add_column</tt><big>(</big><em>$table</em><span class="optional">[</span>, <em>$field = array()</em><span class="optional">[</span>, <em>$_after = NULL</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_DB_forge::add_column" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$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"> <tt class="descname">add_field</tt><big>(</big><em>$field</em><big>)</big><a class="headerlink" href="#CI_DB_forge::add_field" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$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"> <tt class="descname">add_key</tt><big>(</big><em>$key</em><span class="optional">[</span>, <em>$primary = FALSE</em><span class="optional">]</span><big>)</big><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"> <tt class="descname">create_database</tt><big>(</big><em>$db_name</em><big>)</big><a class="headerlink" href="#CI_DB_forge::create_database" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$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"> <tt class="descname">create_table</tt><big>(</big><em>$table</em><span class="optional">[</span>, <em>$if_not_exists = FALSE</em><span class="optional">[</span>, <em>array $attributes = array()</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_DB_forge::create_table" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$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"> <tt class="descname">drop_column</tt><big>(</big><em>$table</em>, <em>$column_name</em><big>)</big><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"> <tt class="descname">drop_database</tt><big>(</big><em>$db_name</em><big>)</big><a class="headerlink" href="#CI_DB_forge::drop_database" title="Permalink to this definition">¶</a></dt> <dd><table class="docutils field-list" frame="void" rules="none"> <col class="field-name" /> <col class="field-body" /> <tbody valign="top"> <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple"> <li><strong>$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"> <tt class="descname">drop_table</tt><big>(</big><em>$table_name</em><span class="optional">[</span>, <em>$if_exists = FALSE</em><span class="optional">]</span><big>)</big><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"> <tt class="descname">modify_column</tt><big>(</big><em>$table</em>, <em>$field</em><big>)</big><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"> <tt class="descname">rename_table</tt><big>(</big><em>$table_name</em>, <em>$new_table_name</em><big>)</big><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 - 2017, British Columbia Institute of Technology. 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