目录先更新数据库，还是先更新缓存?1.先更新数据库，再更新缓存2.先更新缓存，再更新数据库。结论Cache Aside策略1.先删除缓存，再更新数据库。2.先更新数据库，再删除缓存分析【先更新数据库，再删除缓存】存在的问
i\'ve got 3 Log classes that all implements iLog interface: DatabaseLog FileLog ScreenLog there can only be one instance of them. initially i though of using single pattern for each class but then
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