Not able to connect PostgreSQL with Yii - postgresql

Question

I have tried to connect PostgreSQL with Yii but is is showing
CDbConnection failed to open the DB connection.
In log it is showing
error exception.CDbException
could not find driver
My code
'db'=>array(
'tablePrefix'=>'',
'connectionString' => 'pgsql:host=localhost;port=5432;dbname=postgres',
'username'=>'postgres',
'password'=>'postgres',
'charset'=>'UTF8',
),

Answer 1

Yii Database component is build on top of PHP PDO. So Here are list of posibilities to check
Check that PostgreSQL and PostgreSQL's PDO Extension is installed and working. Also that port is right one. You can test simple PHP Script to test.
Below are links to something that might be similar
PostgreSql 'PDOException' with message 'could not find driver'
PDOException “could not find driver”
Install PDO on Linux (Ubuntu/Debian)
Install pdo for postgres Ubuntu
https://serverfault.com/questions/89970/how-to-install-postgresql-extension-for-pdo-in-linux
Windows
http://blog.lysender.com/2010/08/php-and-postgresql-on-windows/
Apache php 5.3 postgreSQL driver could not be loaded
Official PHP Information on Issue
http://php.net/manual/en/pdo.installation.php
http://www.php.net/manual/en/ref.pdo-pgsql.php

Answer 2

Resolved issue...by adding
LoadFile "C:/wamp/bin/php/php5.3.5/libpq.dll"
to httpd.conf file. Now phpinfo() is showing pgsql PDO.
thanks...

Answer 3

if you work in ubuntu make sure that you have installed pgsql library
sudo apt-get install php-pgsql
sudo service apache2 restart
after make sure that in the console and main-local there are this array
'components' => [
'log' => [
'targets' => [
[
'class' => 'yii\log\FileTarget',
'levels' => ['error', 'warning'],
],
],
],
'db' => [
'class' => 'yii\db\Connection',
'dsn' => 'pgsql:host=localhost;port=5432;dbname=yourdb',
'username' => 'user',
'password' => 'pw',
'charset' => 'utf8',
],],

Answer 4

In my case, it was a case of enabling the php_pdo_pgsql extension in WAMP

Answer 5

for those struggling with the same issue i did the work around.
environment
Yii2
server:LAMP stack 7.1
problem Driver not found i.e the "requirements.php" shows warning
"PDO PostgreSQL extension Warning All DB-related classes Required for PostgreSQL database."
i noted that pdo_pgsql.so is not packaged together with bitnami so i search for it online or try locate if installed on any php versions in /usr/lib/php
copy that file to lampstack-7.1.10-1/php/lib/php/extensions.
now go to lampstack php.ini "lampstack-7.1.10-1/php/etc/php.ini"
now place this line "extension=pdo_pgsql.so" remove ; if commented out NB you can point to the absolute path "/usr/lib/php/pdo_pgsql.so" if it existed there
restart Lamp apache server
visit requirement.php and if you see ""PDO PostgreSQL extension Passed All DB-related classes Required for PostgreSQL database.""