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Diffstat (limited to 'user_guide_src/source/database/configuration.rst')
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diff --git a/user_guide_src/source/database/configuration.rst b/user_guide_src/source/database/configuration.rst new file mode 100644 index 000000000..77b4994a3 --- /dev/null +++ b/user_guide_src/source/database/configuration.rst @@ -0,0 +1,107 @@ +###################### +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: +---------------------- + +- **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. |