PDO MySQL Exceptions

[Dead6re]

Having trouble getting PDO exceptions to work, instead is raising the error handler in PHP. The connection string is fine, the port is supposed to be incorrect so I can generate a log message and show an simple error screen to the client.

 

Warning: PDO::__construct() [pdo.--construct]: [2002] A connection attempt failed because the connected party did not (trying to connect via tcp://127.0.0.1:3305)

 

PHP Version 5.3.2

MySQL Version  5.1.47-community

 

	try {
		$options = array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => true, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);

		$this->db = new PDO($dsn, $username, $password, $options);
		//$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
		//$this->db->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
	} catch (PDOException $e) {
		$this->throwError('PDODatabase->connect', 'Connection Failed: ' . $e->getMessage());
		return false;
	}

[roopurt18]

In my experience with PDO/PgSql, my code ends up looking like:

 

<?php
class PDO_PgSql extends PDO {
    /**
    * @param string $host
    * @param string $port
    * @param string $user
    * @param string $password
    * @param [string] $dbname
    * @param [string] $port
    * @param [bool] $throw_exceptions
    * @param [bool] $ssl_mode
    * @return PDO_PgSql
    */
    public function __construct( $host, $user, $password, $dbname = null, $port = null, $throw_exceptions = true, $ssl_mode = false ) {
        //
        // Build the connection string
        if( $port === null ) {
            $port = '5432'; // Default pgsql port
        }
        $dsn = sprintf(
            'pgsql:host=%s port=%s user=%s password=%s',
            $host,
            $port,
            $user,
            $password
        );
        if( $dbname !== null ) {
            $dsn .= ' dbname=' . $dbname;
        }
        if( $ssl_mode === true ) {
            $dsn .= ' sslmode=require';
        }else{
            $dsn .= ' sslmode=disable';
        }
        //
        // Driver options
        $driver_opts = array();
        if( $throw_exceptions === true ) {
            $driver_opts[ PDO::ATTR_ERRMODE ] = PDO::ERRMODE_EXCEPTION;
        }else{
            $driver_opts[ PDO::ATTR_ERRMODE ] = PDO::ERRMODE_WARNING;
        }
        //
        // Create
        parent::__construct( $dsn, null, null, $driver_opts );
        //
        // Custom PDOStatement class
        $this->setAttribute( PDO::ATTR_STATEMENT_CLASS, array( 'PDOStatement_PgSql' ) );
        //
        // Throw exceptions.  Yes, set it in two places
        if( $throw_exceptions === true ) {
            $this->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
        }
    }
    
...
}
?>

 

You'll notice that I turn on exception handling via options in the constructor as well as explicitly calling the setAttribute() method.  It doesn't seem to hurt anything and its the only way I was able to get it to work uniformly on Windows and Linux with the versions of PHP I run.

 

Hope that helps.

[Dead6re]

Seems that PDO is supposed to act the way it is as the warning I have is a E_NOTICE error. Generally a PHP config is set with E_ALL & ~E_NOTICE for production environments and thus isn't seen. Changing the timeout seem to help reponsiveness in the script.

[Dead6re]

Seems that PDO is supposed to act the way it is as the warning I have is a E_NOTICE error. Generally a PHP config is set with E_ALL & ~E_NOTICE for production environments and thus isn't seen. Changing the timeout seem to help reponsiveness in the script if the host could not be found.