Merge branch 'refs/heads/develop' into feature/unit-tests

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diff --git a/user_guide_src/source/database/configuration.rst b/user_guide_src/source/database/configuration.rst
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+######################
+Database Configuration
+######################
+
+CodeIgniter has a config file that lets you store your database
+connection values (username, password, database name, etc.). The config
+file is located at application/config/database.php. You can also set
+database connection values for specific
+:doc:`environments <../libraries/config>` by placing **database.php**
+it the respective environment config folder.
+
+The config settings are stored in a multi-dimensional array with this
+prototype::
+
+	$db['default']['hostname'] = "localhost";
+	$db['default']['username'] = "root";
+	$db['default']['password'] = "";
+	$db['default']['database'] = "database_name";
+	$db['default']['dbdriver'] = "mysql";
+	$db['default']['dbprefix'] = "";
+	$db['default']['pconnect'] = TRUE;
+	$db['default']['db_debug'] = FALSE;
+	$db['default']['cache_on'] = FALSE;
+	$db['default']['cachedir'] =  "";
+	$db['default']['char_set'] = "utf8";
+	$db['default']['dbcollat'] = "utf8_general_ci";
+	$db['default']['swap_pre'] = "";
+	$db['default']['autoinit'] = TRUE;
+	$db['default']['stricton'] = FALSE;
+
+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::
+
+	$db['test']['hostname'] = "localhost";
+	$db['test']['username'] = "root";
+	$db['test']['password'] = "";
+	$db['test']['database'] = "database_name";
+	$db['test']['dbdriver'] = "mysql";
+	$db['test']['dbprefix'] = "";
+	$db['test']['pconnect'] = TRUE;
+	$db['test']['db_debug'] = FALSE;
+	$db['test']['cache_on'] = FALSE;
+	$db['test']['cachedir'] =  "";
+	$db['test']['char_set'] = "utf8";
+	$db['test']['dbcollat'] = "utf8_general_ci";
+	$db['test']['swap_pre'] = "";
+	$db['test']['autoinit'] = TRUE;
+	$db['test']['stricton'] = FALSE;
+
+Then, to globally tell the system to use that group you would set this
+variable located in the config file::
+
+	$active_group = "test";
+
+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.
+
+Active Record
+-------------
+
+The :doc:`Active Record Class <active_record>` 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.
+
+::
+
+	$active_record = TRUE;
+
+.. note:: that some CodeIgniter classes such as Sessions require Active
+	Records be enabled to access certain functionality.
+
+Explanation of Values:
+----------------------
+
+======================  ==================================================================================================
+ Name Config             Description
+======================  ==================================================================================================
+**hostname** 		The hostname of your database server. Often this is "localhost".
+**username**		The username used to connect to the database.
+**password**		The password used to connect to the database.
+**database**		The name of the database you want to connect to.
+**dbdriver**		The database type. ie: mysql, postgres, odbc, etc. Must be specified in lower case.
+**dbprefix**		An optional table prefix which will added to the table name when running :doc:
+			`Active Record <active_record>` queries. This permits multiple CodeIgniter installations
+			to share one database.
+**pconnect**		TRUE/FALSE (boolean) - Whether to use a persistent connection.
+**db_debug**		TRUE/FALSE (boolean) - Whether database errors should be displayed.
+**cache_on**		TRUE/FALSE (boolean) - Whether database query caching is enabled,
+			see also :doc:`Database Caching Class <caching>`.
+**cachedir**		The absolute server path to your database query cache directory.
+**char_set**		The character set used in communicating with the database.
+**dbcollat**		The character collation used in communicating with the database
+
+			.. note:: For MySQL and MySQLi databases, this setting is only used
+				as a backup if your server is running PHP < 5.2.3 or MySQL < 5.0.7
+				(and in table creation queries made with DB Forge). There is an
+				incompatibility in PHP with mysql_real_escape_string() which can
+				make your site vulnerable to SQL injection if you are using a
+				multi-byte character set and are running versions lower than these.
+				Sites using Latin-1 or UTF-8 database character set and collation are
+				unaffected.
+
+**swap_pre**		A default table prefix that should be swapped with dbprefix. 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.
+**autoinit**		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.
+**stricton**		TRUE/FALSE (boolean) - Whether to force "Strict Mode" connections, good for ensuring strict SQL
+			while developing an application.
+**port**		The database port number. To use this value you have to add a line to the database config array.
+			::
+				$db['default']['port'] =  5432;
+======================  ==================================================================================================
+
+.. note:: 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.