Tuesday, December 23, 2014

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 environments by placing database.php it the respective environment config folder.

$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;

Explanation of Values:

  • 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 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 Database Caching Class.
  • 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.
  • 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.
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