public function __construct($table_name)
 {
     add_filter('posts_join', array($this, 'search_join'));
     add_filter('posts_where', array($this, 'search_where'));
     add_filter('posts_groupby', array($this, 'search_groupby'));
     parent::__construct($table_name);
 }
 /**
  *  
  *  
  *  
  *  
  *  @since 
  *  
  *  @return Return_Description
  *  
  *  @access public
  */
 public function __construct()
 {
     $this->primary_key = 'author_id';
     $this->version = '1.0';
     parent::__construct('mbdbmk_authors');
 }