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17 lines
500 B
17 lines
500 B
'''
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全局只允许一个实例的办法，
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在该电商系统中，全局只有一个数据库连接，使用单例模式确保在整个应用程序内只创建一次数据库连接实例。
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'''
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class DatabaseConnection:
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_instance = None
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def __new__(cls):
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if not cls._instance:
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cls._instance = super().__new__(cls)
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cls._instance.connect_to_db()
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return cls._instance
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def connect_to_db(self):
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# 连接到数据库的代码...
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pass |