sql.py 文件源码

def bindparam(key, value = None, type=None):
    """creates a bind parameter clause with the given key.  

    An optional default value can be specified by the value parameter, and the optional type parameter
    is a sqlalchemy.types.TypeEngine object which indicates bind-parameter and result-set translation for
    this bind parameter."""
    if isinstance(key, schema.Column):
        return BindParamClause(key.name, value, type=key.type)
    else:
        return BindParamClause(key, value, type=type)