Laravel PostgreSQL Connection Error: How to Fix 'PDOException: Could not Find Driver'?

Laravel: Troubleshooting "PDOException: Could not Find Driver in PostgreSQL"

Problem Description:

While attempting to connect to a PostgreSQL database using Laravel's database migration, one may encounter an error indicating that the driver could not be found. This occurs when the database configuration is not properly set or the required PHP extensions are not installed.

Solution:

1. Configure Database Default:

Ensure the 'default' key in app/config/database.php is set to 'postgres'.

'default' => 'postgres',

2. Install and Enable PHP Extensions:

Verify that the following PHP extensions are installed and enabled:

• pdo_pgsql.so
• pgsql.so

For Windows users, these extensions should be present in the official PHP distribution. Uncomment the following lines in php.ini:

extension=pdo_pgsql.so
extension=pgsql.so

3. Configure extension_dir:

Make sure the extension_dir in php.ini is set to the correct path where the extensions are located (e.g., ext or extensions folder in your PHP installation directory).

4. Copy libpq.dll (Windows Only):

Copy libpq.dll from C:wampbinphpphp5.* to C:wampbinapache*bin and restart WampServer services.

5. Set PostgreSQL Bin Directory in PATH:

Add the PostgreSQL bin directory to your PATH environment variable:

• Go to System Properties -> Advanced tab -> Environment Variables
• Edit the PATH in 'System variables' and append the full path to the PostgreSQL bin directory (e.g., C:Program FilesPostgreSQLbin)

Restart your command prompt or computer to apply the changes.

Other Resources:

• [PHP PECL Windows Installation Guide](http://php.net/manual/en/install.pecl.windows.php)
• [PHP Extension Setup Cheatsheet](http://webcheatsheet.com/php/install_and_configure.php#extsetup)

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