dal.py 文件源码

def lazy_define_table(
        self,
        tablename,
        *fields,
        **args
        ):
        args_get = args.get
        common_fields = self._common_fields
        if common_fields:
            fields = list(fields) + list(common_fields)

        table_class = args_get('table_class',Table)
        table = table_class(self, tablename, *fields, **args)
        table._actual = True
        self[tablename] = table
        # must follow above line to handle self references
        table._create_references()
        for field in table:
            if field.requires == DEFAULT:
                field.requires = sqlhtml_validators(field)

        migrate = self._migrate_enabled and args_get('migrate',self._migrate)
        if migrate and not self._uri in (None,'None') \
                or self._adapter.dbengine=='google:datastore':
            fake_migrate = self._fake_migrate_all or \
                args_get('fake_migrate',self._fake_migrate)
            polymodel = args_get('polymodel',None)
            try:
                GLOBAL_LOCKER.acquire()
                self._lastsql = self._adapter.create_table(
                    table,migrate=migrate,
                    fake_migrate=fake_migrate,
                    polymodel=polymodel)
            finally:
                GLOBAL_LOCKER.release()
        else:
            table._dbt = None
        on_define = args_get('on_define',None)
        if on_define: on_define(table)
        return table