dal.py 文件源码

def log(self, message, table=None):
        """ Logs migrations

        It will not log changes if logfile is not specified. Defaults
        to sql.log
        """

        isabs = None
        logfilename = self.adapter_args.get('logfile', 'sql.log')
        writelog = bool(logfilename)
        if writelog:
            isabs = os.path.isabs(logfilename)

        if table and table._dbt and writelog and self.folder:
            if isabs:
                table._loggername = logfilename
            else:
                table._loggername = pjoin(self.folder, logfilename)
            logfile = self.file_open(table._loggername, 'a')
            logfile.write(message)
            self.file_close(logfile)