Change color of a row of a QTableView?

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I subclassed it:

class ColorfullSqlQueryModel(QtSql.QSqlQueryModel):
   def __init__(self, dbcursor=None):
       super(ColorfullSqlQueryModel, self).__init__()

   def data(self, QModelIndex, role=None):
       v = QtSql.QSqlQueryModel.data(self, QModelIndex, role);
       if role == QtCore.Qt.BackgroundRole:
           return QtGui.QColor(QtCore.Qt.yellow)
       return (v);

It works!! Turns all rows to yellow!
But how can I make it paint only the rows I want?
How can I pass the color to function data?