Why does Laravel throw a 'PDOException: Could not Find Driver' error when connecting to PostgreSQL?

Unresolved "PDOException: Could not Find Driver" Error in Laravel While Attempting PostgreSQL Connection

Problem:

You are attempting to connect to a PostgreSQL database via Laravel but encounter the error message "PDOException: Could not Find Driver." Specifically, the issue arises when you run the "php artisan migrate" command, and the database configuration indicates the use of MySQL.

Possible Solutions:

Set Default Connection:

• Ensure that the 'default' key in the 'app/config/database.php' file correctly reflects the connection you want to use. For PostgreSQL, it should be:

  'default' => 'postgres',

Install and Configure PHP Extensions:

• Verify that you have the necessary PHP extensions installed for PostgreSQL. Specifically, you require 'pdo_pgsql.so' and 'pgsql.so' to be enabled.

Windows Setup:

• For Windows systems, these extensions are typically included with the official PHP distribution. In the 'php.ini' file, uncomment the following lines:

  extension=pdo_pgsql.so
  extension=pgsql.so

• Set the 'extension_dir' value in 'php.ini' to point to the correct PHP extensions directory (e.g., "extension_dir = "c:/wamp/bin/php/php5.5.12/ext/").
• Copy 'libpq.dll' from 'C:wampbinphpphp5.' to 'C:wampbinapachebin' and restart all services via WampServer.

Add PostgreSQL Directory to PATH:

• In case of persistent issues, add the PostgreSQL bin directory to your PATH. To do this:

  • Go to System Properties -> Advanced -> Environment Variables.
  • Find the PATH entry in System variables.
  • Add the full path to your PostgreSQL bin directory to the end of the PATH.
  • Restart your command prompt or computer.

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