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+<td><h1>CodeIgniter User Guide Version 2.0.2</h1></td>
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+<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
+<a href="../index.html">User Guide Home</a> ›
+<a href="index.html">Database Library</a> ›
+Configuration
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+<h1>Database Configuration</h1>
+
+<p>CodeIgniter has a config file that lets you store your database connection values (username, password, database name, etc.).
+The config file is located at <samp>application/config/database.php</samp>. You can also set database connection values for specific <a href="../libraries/config.html">environments</a> by placing <strong>database.php</strong> it the respective environment config folder.</p>
+
+<p>The config settings are stored in a multi-dimensional array with this prototype:</p>
+
+<code>$db['default']['hostname'] = "localhost";<br />
+$db['default']['username'] = "root";<br />
+$db['default']['password'] = "";<br />
+$db['default']['database'] = "database_name";<br />
+$db['default']['dbdriver'] = "mysql";<br />
+$db['default']['dbprefix'] = "";<br />
+$db['default']['pconnect'] = TRUE;<br />
+$db['default']['db_debug'] = FALSE;<br />
+$db['default']['cache_on'] = FALSE;<br />
+$db['default']['cachedir'] = "";<br />
+$db['default']['char_set'] = "utf8";<br />
+$db['default']['dbcollat'] = "utf8_general_ci";<br />
+$db['default']['swap_pre'] = "";<br />
+$db['default']['autoinit'] = TRUE;<br />
+$db['default']['stricton'] = FALSE;</code>
+
+<p>The reason we use a multi-dimensional array rather than a more simple one is to permit you to optionally store
+multiple sets of connection values. If, for example, you run multiple environments (development, production, test, etc.)
+under a single installation, you can set up a connection group for each, then switch between groups as needed.
+For example, to set up a "test" environment you would do this:</p>
+
+<code>$db['test']['hostname'] = "localhost";<br />
+$db['test']['username'] = "root";<br />
+$db['test']['password'] = "";<br />
+$db['test']['database'] = "database_name";<br />
+$db['test']['dbdriver'] = "mysql";<br />
+$db['test']['dbprefix'] = "";<br />
+$db['test']['pconnect'] = TRUE;<br />
+$db['test']['db_debug'] = FALSE;<br />
+$db['test']['cache_on'] = FALSE;<br />
+$db['test']['cachedir'] = "";<br />
+$db['test']['char_set'] = "utf8";<br />
+$db['test']['dbcollat'] = "utf8_general_ci";<br />
+$db['test']['swap_pre'] = "";<br />
+$db['test']['autoinit'] = TRUE;<br />
+$db['test']['stricton'] = FALSE;</code>
+
+
+<p>Then, to globally tell the system to use that group you would set this variable located in the config file:</p>
+
+<code>$active_group = "test";</code>
+
+<p>Note: The name "test" is arbitrary. It can be anything you want. By default we've used the word "default"
+for the primary connection, but it too can be renamed to something more relevant to your project.</p>
+
+<h3>Active Record</h3>
+
+<p>The <a href="active_record.html">Active Record Class</a> is globally enabled or disabled by setting the $active_record variable in the database configuration file to TRUE/FALSE (boolean). If you are not using the active record class, setting it to FALSE will utilize fewer resources when the database classes are initialized.</p>
+
+<code>$active_record = TRUE;</code>
+
+<p class="important"><strong>Note:</strong> that some CodeIgniter classes such as Sessions require Active Records be enabled to access certain functionality.</p>
+
+<h3>Explanation of Values:</h3>
+
+<ul>
+<li><strong>hostname</strong> - The hostname of your database server. Often this is "localhost".</li>
+<li><strong>username</strong> - The username used to connect to the database.</li>
+<li><strong>password</strong> - The password used to connect to the database.</li>
+<li><strong>database</strong> - The name of the database you want to connect to.</li>
+<li><strong>dbdriver</strong> - The database type. ie: mysql, postgres, odbc, etc. Must be specified in lower case.</li>
+<li><strong>dbprefix</strong> - An optional table prefix which will added to the table name when running <a href="active_record.html">Active Record</a> queries. This permits multiple CodeIgniter installations to share one database.</li>
+<li><strong>pconnect</strong> - TRUE/FALSE (boolean) - Whether to use a persistent connection.</li>
+<li><strong>db_debug</strong> - TRUE/FALSE (boolean) - Whether database errors should be displayed.</li>
+<li><strong>cache_on</strong> - TRUE/FALSE (boolean) - Whether database query caching is enabled, see also <a href="caching.html">Database Caching Class</a>.</li>
+<li><strong>cachedir</strong> - The absolute server path to your database query cache directory.</li>
+<li><strong>char_set</strong> - The character set used in communicating with the database.</li>
+<li><strong>dbcollat</strong> - The character collation used in communicating with the database.</li>
+<li><strong>swap_pre</strong> - A default table prefix that should be swapped with <var>dbprefix</var>. This is useful for distributed applications where you might run manually written queries, and need the prefix to still be customizable by the end user.</li>
+<li><strong>autoinit</strong> - Whether or not to automatically connect to the database when the library loads. If set to false, the connection will take place prior to executing the first query.</li>
+<li><strong>stricton</strong> - TRUE/FALSE (boolean) - Whether to force "Strict Mode" connections, good for ensuring strict SQL while developing an application.</li>
+<li><strong>port</strong> - The database port number. To use this value you have to add a line to the database config array.<code>$db['default']['port'] = 5432;</code>
+</ul>
+
+<p class="important"><strong>Note:</strong> Depending on what database platform you are using (MySQL, Postgres, etc.)
+not all values will be needed. For example, when using SQLite you will not need to supply a username or password, and
+the database name will be the path to your database file. The information above assumes you are using MySQL.</p>
+
+
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