Last updated: Fri, 18 Sep 2009

The PDO class

Увод

Represents a connection between PHP and a database server.

Синтаксис за класове

PDO

PDO {

__construct ( string $dsn [, string $username [, string $password [, array $driver_options ]]] )

bool beginTransaction ( void )

bool commit ( void )

mixed errorCode ( void )

array errorInfo ( void )

int exec ( string $statement )

mixed getAttribute ( int $attribute )

array getAvailableDrivers ( void )

string lastInsertId ([ string $name = NULL ] )

PDOStatement prepare ( string $statement [, array $driver_options = array() ] )

PDOStatement query ( string $statement )

string quote ( string $string [, int $parameter_type = PDO::PARAM_STR ] )

bool rollBack ( void )

bool setAttribute ( int $attribute , mixed $value )

}

Съдържание

PDO::beginTransaction — Initiates a transaction
PDO::commit — Commits a transaction
PDO::__construct — Creates a PDO instance representing a connection to a database
PDO::errorCode — Fetch the SQLSTATE associated with the last operation on the database handle
PDO::errorInfo — Fetch extended error information associated with the last operation on the database handle
PDO::exec — Execute an SQL statement and return the number of affected rows
PDO::getAttribute — Retrieve a database connection attribute
PDO::getAvailableDrivers — Return an array of available PDO drivers
PDO::lastInsertId — Returns the ID of the last inserted row or sequence value
PDO::prepare — Prepares a statement for execution and returns a statement object
PDO::query — Executes an SQL statement, returning a result set as a PDOStatement object
PDO::quote — Quotes a string for use in a query.
PDO::rollBack — Rolls back a transaction
PDO::setAttribute — Set an attribute

PDO::beginTransaction

Large Objects (LOBs)

Last updated: Fri, 18 Sep 2009

add a note User Contributed Notes
PDO

Megaloman
18-Feb-2009 03:03


"And storing username/password inside class is not a very good idea for production code."



Good idea is to store database connection settings in *.ini files but you have to restrict access to them. For example this way:



my_setting.ini:

[database]

driver = mysql

host = localhost

;port = 3306

schema = db_schema

username = user

password = secret



Database connection:

<?php

class MyPDO extends PDO

{

    public function __construct($file = 'my_setting.ini')

    {

        if (!$settings = parse_ini_file($file, TRUE)) throw new exception('Unable to open ' . $file . '.');

        

        $dns = $settings['database']['driver'] .

        ':host=' . $settings['database']['host'] .

        ((!empty($settings['database']['port'])) ? (';port=' . $settings['database']['port']) : '') .

        ';dbname=' . $settings['database']['schema'];

        

        parent::__construct($dns, $settings['database']['username'], $settings['database']['password']);

    }

}

?>



Database connection parameters are accessible via human readable ini file for those who screams even if they see one PHP/HTML/any_other command.

anrdaemon at freemail dot ru
22-Aug-2008 08:16


Keep in mind, you MUST NOT use 'root' user in your applications, unless your application designed to do a database maintenance.



And storing username/password inside class is not a very good idea for production code. You would need to edit the actual working code to change settings, which is bad.

schizo_mind at hotmail dot com
28-Jul-2008 05:00


<?php


class PDOConfig extends PDO {


    


    private $engine;


    private $host;


    private $database;


    private $user;


    private $pass;


    


    public function __construct(){


        $this->engine = 'mysql';


        $this->host = 'localhost';


        $this->database = '';


        $this->user = 'root';


        $this->pass = '';


        $dns = $this->engine.':dbname='.$this->database.";host=".$this->host;


        parent::__construct( $dns, $this->user, $this->pass );


    }


}


?>

add a note

PDO::beginTransaction

Large Objects (LOBs)

Last updated: Fri, 18 Sep 2009