php - Design patterns for data source independent model? -

say want build application in models have different data sources (like mysql, api, xml, etc).

what common approache(s) in order implement this, , design patterns used?

i think dao looking for.

think like:

interface rdbmsdriver {     public function connect();     public function disconnect();     public function query($sql);     public function fetchall($sql); }  class mysqlidriver implements rdbmsdriver {     public function connect() { }     public function disconnect() { }     public function query($sql) { }     public function fetchall($sql) { }     }  class pgsqldriver implements rdbmsdriver {     public function connect() { }     public function disconnect() { }     public function query($sql) { }     public function fetchall($sql) { }     }  abstract class rdbmsdao {     protected $driver;      public function __construct(rdbmsdriver $driver) {         $this->driver = $driver;     } }   interface someentitydao {     public function insert(someentity entity);     public function update(someentity entity);     public function delete(someentity entity);     public function find($entitykey);     public function findall(); }  /**  * data relational databases.  */ class someentityrdbmsdao extends rdbmsdao implements someentitydao {     public function insert(someentity entity) { }     public function update(someentity entity) { }     public function delete(someentity entity) { }     public function find($entitykey) { }     public function findall() { } }  // use like: new someentityrdbmsdao(new mysqlidriver(...))  /**  * data webservice  */ class someentitywebservicedao implements someentitydao {     public function insert(someentity entity) { }     public function update(someentity entity) { }     public function delete(someentity entity) { }     public function find($entitykey) { }     public function findall() { }     }  class someentitymodel {     private $persistance;     public function __construct(someentitydao $persistance) {         $this->persistance = $persistance;     } }