Database Object Access

[etaham]

My question is one about best practices. I am starting a large project and decided to use ADOdb as my database abstraction layer. I was wodering how i should pass the ADOdb $db object to each function that requires it.
I don't want to use

global $db;

I was thinking of creating a class called DB with $conn as a public static memeber:

class DB{
    static public $conn;
}

this way any function that needs it can simply call '

class A{
    public function getData(){
        DB::$conn->query();
        ...
    }
} 

Is there a better way of doing this? should i use a stastic function 'get()' in DB instead of accessing the the connection direcly (the connection is created when the script starts, so i dont have to worry about checking the connection before accessing it).
Any advice would be appreciated
Thank you
etaham

[jdorsch]

Use a get() whenver possible and in this instance use the singleton pattern which is lazy instantiation and assures your program only uses one instance. Also, you may not always need your connection every time a page is loaded so a singleton eliminates creating $conn when its not needed.

class DB
{
  /**
   *@var ADOdb
   */
  private static $conn = null;  

  /**
   *@return ADOdb
   */
  public static function getConn()
  {
     if( !isset( self::$conn ) )
     {
         //Instantiate DB here
     }
     return self::$conn ;
  }

}

DB::getConn()->query() ;