Database configuration Codeigniter framework

 To connect with database in CodeIgniter you have to change config file that store your database connection values (username, password, database name, etc.). The config

file is located at application/config/database.php.

The config file look like this.

$db['default'] = array(
         'dsn'   => '',
        'hostname' => 'localhost',
        'username' => 'root',
        'password' => '',
        'database' => 'database_name',
        'dbdriver' => 'mysqli',
        'dbprefix' => '',
        'pconnect' => TRUE,
        'db_debug' => TRUE,
        'cache_on' => FALSE,
        'cachedir' => '',
        'char_set' => 'utf8',
        'dbcollat' => 'utf8_general_ci',
        'swap_pre' => '',
        'encrypt' => FALSE,
        'compress' => FALSE,
        'stricton' => FALSE,
        'failover' => array()
);
Let’s discuss about above the config value.

Name Config	Description
dsn	The DSN connect string (an all-in-one configuration sequence).
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: mysqli, postgre, odbc, etc. Must be specified in lower case.
dbprefix	An optional table prefix which will added to the table name when running Query Builder 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.
	The character collation used in communicating with the database
dbcollat	Note
	Only used in the ‘mysql’ and ‘mysqli’ drivers.
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.
schema	The database schema, defaults to ‘public’. Used by PostgreSQL and ODBC drivers.
encrypt	Whether or not to use an encrypted connection. ‘mysql’ (deprecated), ‘sqlsrv’ and ‘pdo/sqlsrv’ drivers accept TRUE/FALSE ‘mysqli’ and ‘pdo/mysql’ drivers accept an array with the following options: ‘ssl_key’ - Path to the private key file ‘ssl_cert’ - Path to the public key certificate file ‘ssl_ca’ - Path to the certificate authority file ‘ssl_capath’ - Path to a directory containing trusted CA certificates in PEM format ‘ssl_cipher’ - List of allowed ciphers to be used for the encryption, separated by colons (‘:’) ‘ssl_verify’ - TRUE/FALSE; Whether to verify the server certificate or not (‘mysqli’ only)
compress	Whether or not to use client compression (MySQL only).
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;