How to DB over ZF2

The model used to DB in ZF2 is PDO.
PDO helps to transform a database to Objects.

The PHP Data Objects (PDO) extension defines a lightweight, consistent interface for accessing databases in PHP. Each database driver that implements the PDO interface can expose database-specific features as regular extension functions. Note that you cannot perform any database functions using the PDO extension by itself; you must use a database-specific PDO driver to access a database server.

PDO provides a data-access abstraction layer, which means that, regardless of which database you're using, you use the same functions to issue queries and fetch data. PDO does not provide a database abstraction; it doesn't rewrite SQL or emulate missing features. You should use a full-blown abstraction layer if you need that facility.

DB in ZF2 , we call MODEL

http://framework.zend.com/manual/2.0/en/user-guide/database-and-models.html

USING ZFTOOLS 

http://www.masterzendframework.com/tutorial/zftool-for-basic-project-management