HOW TO LOAD MULTIPLE DATABASES IN CODEIGNITER FRAMEWORK.

Date posted :26/04/2019

LOAD MULTIPLE DATABASES:

Most importantly, codeIgniter has a config file that you can store your database connection values such as username, password, database name.

Therefore this config file located at application/config/database.php. 

$db['default'] = array(
	'dsn'	=> '',
	'hostname' => 'localhost',
	'username' => 'root',
	'password' => '',
	'database' => 'form',
	'dbdriver' => 'mysqli',
	'dbprefix' => '',
	'pconnect' => FALSE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);
  • 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,etc. Must be specified in lower case.
  • dbprefix – An optional table prefix which will added to the table name when running  queries of Active Record. This permits multiple CodeIgniter installations to share one database.
  • pconnect – TRUE/FALSE – Whether to use a persistent connection.
  • db_debug – TRUE/FALSE – Whether database errors should be displayed.
  • cache_on – TRUE/FALSE – Whether database query caching is enabled.
  • 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.

DATABASE CONFIGURATION FILE OF CODEIGNITER

Similarly, to open Database Configuration file, go to application/config/database.php

Firstly, you need to change ‘pconnect’ => FALSE,

MAKE TWO DATABASE CONNECTIVITY SETTINGS

/* ======= First database connectivity Settings =========*/
$db['default'] = array(
	'dsn'	=> '',
	'hostname' => 'localhost',
	'username' => 'root',
	'password' => '',
	'database' => 'form',
	'dbdriver' => 'mysqli',
	'dbprefix' => '',
	'pconnect' => TRUE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);

/* ======= Second database connectivity Settings =========*/
$db['database2'] = array(
	'dsn'	=> '',
	'hostname' => 'localhost',
	'username' => 'root',
	'password' => '',
	'database' => 'db2',
	'dbdriver' => 'mysqli',
	'dbprefix' => '',
	'pconnect' => TRUE,
	'db_debug' => (ENVIRONMENT !== 'production'),
	'cache_on' => FALSE,
	'cachedir' => '',
	'char_set' => 'utf8',
	'dbcollat' => 'utf8_general_ci',
	'swap_pre' => '',
	'encrypt' => FALSE,
	'compress' => FALSE,
	'stricton' => FALSE,
	'failover' => array(),
	'save_queries' => TRUE
);

NOTE:

Important Setting: As a result, codeigniter cannot connect multiple database in connection. So you need to put a simple setting in system/database/ DB_driver.php

<?php
public function simple_query($sql)
 {
 if ( ! $this->conn_id)
 {
 if ( ! $this->initialize())
 {
 return FALSE;
 }
 }
 $this->db_select(); //Just Add this line here
 
 return $this->_execute($sql);
 } 
 
?>

Conclusion

In this article, I have discussed the problem and the solution to using multiple database connections in CodeIgniter projects.

Thanks for using pheonix solutions.

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