db.py 文件源码

def __init__(self, db_module, keywords):
        """Creates a database.
        """
        # some DB implementaions take optional paramater `driver` to use a specific driver modue
        # but it should not be passed to connect
        keywords.pop('driver', None)

        self.db_module = db_module
        self.keywords = keywords

        self._ctx = threadeddict()
        # flag to enable/disable printing queries
        self.printing = config.get('debug_sql', config.get('debug', False))
        self.supports_multiple_insert = False

        try:
            import DBUtils
            # enable pooling if DBUtils module is available.
            self.has_pooling = True
        except ImportError:
            self.has_pooling = False

        # Pooling can be disabled by passing pooling=False in the keywords.
        self.has_pooling = self.keywords.pop('pooling', True) and self.has_pooling