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public oaEntities()
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: base("name=MyStrConn")
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{
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//策略一：数据库不存在时重新创建数据库
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//Database.SetInitializer<oaEntities>(new CreateDatabaseIfNotExists<oaDbContext>());
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//策略二：每次启动应用程序时创建数据库
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//Database.SetInitializer<oaEntities>(new DropCreateDatabaseAlways<oaDbContext>());
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//策略三：模型更改时重新创建数据库
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//Database.SetInitializer<oaEntities>(new DropCreateDatabaseIfModelChanges<oaEntities>());
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//策略四：从不创建数据库
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Database.SetInitializer<oaEntities>(null);
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}