docs: function( key, callback ){
      this._query('select info from "'+this.infoTable+'" where id=\''+key+":info\'", function(err, rows){
        if ( err || !rows || !rows.length ){
          callback('Key Not Found ' + key, null);
        } else {
          var info = rows[0].info;
          callback(null, info);
        }
      });
    }