admin.py 文件源码

def set_up(self, drop=False):
        """Create a new DB and create the initial scheme.

        If the database exists and drop=True, the existing database is dropped
        and recreated. Regardless, any tables defined by the schema that do not
        exist are created.

        Parameters
        ----------
        drop : bool, optional (default=False)
            Drop database if it already exists.
        """

        # todo extract database name from engine url and report for brevity
        engine = self.__orm.engine
        if database_exists(engine.url):
            print("Database {} already exists.".format(engine.url))
            if drop:
                print("Dropping old database {}".format(engine.url))
                drop_database(engine.url)
                with possibly_talking_action("Re-creating database..."):
                    create_database(engine.url)
        else:
            with possibly_talking_action("Creating database..."):
                create_database(engine.url)

        with possibly_talking_action("Creating tables..."):
            Base.metadata.create_all(engine)

        print("Database {} created successfully".format(engine.url))