mapper.py 文件源码

def select_by(self, *args, **params):
        """returns an array of object instances based on the given clauses and key/value criterion. 

        *args is a list of zero or more ClauseElements which will be connected by AND operators.
        **params is a set of zero or more key/value parameters which are converted into ClauseElements.
        the keys are mapped to property or column names mapped by this mapper's Table, and the values
        are coerced into a WHERE clause separated by AND operators.  If the local property/column
        names dont contain the key, a search will be performed against this mapper's immediate
        list of relations as well, forming the appropriate join conditions if a matching property
        is located.

        e.g.   result = usermapper.select_by(user_name = 'fred')
        """
        return self.select_whereclause(self._by_clause(*args, **params))