sqlite.py 文件源码

def __init__(self, url, result_table="results", complementary_table="complementary", space_table="space"):
        super(SQLiteConnection, self).__init__()
        if url.endswith("/"):
            raise RuntimeError("Empty database name {}".format(url))

        if url.endswith((" ", "\t")):
            raise RuntimeError("Database name ends with space {}".format(url))

        if not url.startswith("sqlite://"):
            raise RuntimeError("Missing 'sqlite:///' at the begin of url".format(url))

        if url == "sqlite://" or url == "sqlite:///:memory:":
            raise RuntimeError("Cannot use memory database as it exists only for the time of the connection")

        match = re.search("sqlite:///(.*)", url)
        if match is not None:
            db_path = match.group(1)
        else:
            raise RuntimeError("Cannot find sqlite db path in {}".format(url))

        self.url = url
        self.result_table_name = result_table
        self.complementary_table_name = complementary_table
        self.space_table_name = space_table

        self._lock = filelock.FileLock("{}.lock".format(db_path))
        self.hold_lock = False

        # with self.lock():
        #     db = dataset.connect(self.url)

        #     # Initialize a result table and ensure float for loss
        #     results = db[self.result_table_name]
        #     results.create_column("_loss", sqlalchemy.Float)