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php – connecting postgresql and codeigniter

Posted by: admin July 12, 2020 Leave a comment


I’m new using postgresql and I’ve been using Codeigniter for a year.

I have a small postgresql database and I wanna call it from Codeigniter.

In my database.php file I have this setup:

$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
'dsn'   => 'pgsql:host=localhost;port=5432;dbname=test;user=postgres;password=aPass',
// 'dsn'    => '',
'hostname' => 'localhost',
'username' => 'postgres',
'password' => 'aPass',
'database' => 'test',
'dbdriver' => '',
'dbprefix' => '',
'pconnect' => FALSE,
'db_debug' => TRUE,
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
  // 'port' => '5432'

In a controller I have this function:

public function dbtest(){


    $feeds = $this->db->get('vts_feeds');
    echo $feeds;die();

The result I’m getting is:

An Error Was Encountered
You have not selected a database type to connect to.

Why is it not working?

How to&Answers:

Try to set,

dbdriver – The database type. ie: mysql, postgres, odbc, etc. Must be
specified in lower case.

More Info: https://www.codeigniter.com/user_guide/database/configuration.html

EDIT: Try this config for PDO in postgres

$db['default']['hostname'] = 'pgsql:host=localhost;dbname=yourdb'; //set host
$db['default']['username'] = 'your username'; //set username
$db['default']['password'] = 'your password'; //set password
$db['default']['database'] = 'your database'; //set databse
$db['default']['dbdriver'] = 'pdo'; //set driver here


Remove the ‘dsn’ string and change to 'dbdriver' => 'postgre' in the config array.

Despite the CI docs stating the value should be 'postgres' if you check the directory and file names in system>database>drivers the folder is actually called 'postgre', the file name 'postgre_driver.php' and the class 'CI_DB_postgre_driver' so we can assume the docs are wrong here. Weird this hasnt raised its ugly head before


In the file database.php where it reads:

'dbdriver' => ' ',

Put the following argument:

'dbdriver' => 'pgsql',


I just did it right now.
You just leave :

$db['default']['dsn'] = '';

And set:

$db['default']['dbdriver'] = 'postgre';


I had the same problem. Try these steps

  1. don’t remove dsn string add port=>5432 to your config array
  2. set dbdriver to 'dbdriver' => 'postgres'
  3. check your php.ini file if postgre extension is enabled or not extension=php_pdo_pgsql.dll