The model backing the 'StudentDbContext' context has changed since the database was created. Consider using Code First Migrations to update the database(http://go.microsoft.com/fwlink/?LinkId=238269). 解决方法:思路是按照提示 进行EF Code First数据库迁移。 先在出错的数据库上下文中添加如下代码: ...
Code First Migrations更新数据库结构的具体步骤 一、打开程序包管理器控制台 当你的实体模型与数据库架构不一致时,引发以下错误: The model backingthe 'SchoolContext' context has changed since the database was created.Consider using Code First Migrations to update the database (http://go.microsoft.com/...
The model backingthe 'SchoolContext' context has changed since the database was created.Consider using Code First Migrations to update the database (http://Go.microsoft.com/fwlink/?LinkId=238269) 百度搜索Code First Migrations,都说要执行命令 Update-Database ,在哪执行呢?继续找呀找,VS.Net的“程...
The model backingthe 'SchoolContext' context has changed since the database was created.Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269) 百度搜索Code First Migrations,都说要执行命令 Update-Database ,在哪执行呢?继续找呀找,VS.NET的“程...
Consider using Code First Migrations to update the database ( http://go.microsoft.com/fwlink/?LinkId=238269).As the exception suggests, it’s time to start using Code First Migrations. The first step is to enable migrations for our context....
此命令将在解决方案中创建一个名为 Migrations 的文件夹,并在其中放置一个名为 Configuration 的类。 Configuration 类是你配置应用程序迁移的位置,有关此类的详细信息,请参阅Code First 迁移主题。 步骤3:添加初始迁移 创建迁移并应用到本地数据库后,你可能还想要将这些更改应用于其他数据库。 例如,你的本地数据...
我们将避免使用 Add-Migration(除非确实需要),而是专注于让 Code First 迁移自动计算并应用更改。 使用 Update-Database 来获取 Code First 迁移,将模型(新的 Blog.Url 属性)的更改推送到数据库。 在包管理器控制台中运行 Update-Database 命令。 MigrationsAutomaticDemo.BlogContext 数据库现已更新,其中包含“Blogs...
在包管理器控制台中运行 Update-Database 命令。 这会将 InitialCreate 迁移应用到数据库。 由于实际迁移不包含任何更改(因为已暂时将其注释掉),因此它只会向 __MigrationsHistory 表添加一行,指示已应用此迁移。 取消注释 Up 方法中的代码。 这意味着,当此迁移应用于将来的数据库时,本地数据库中已经存在的架构...
If you were to run the application again you would get an InvalidOperationException statingThe model backing the 'BlogContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269). ...
If you were to run the application again you would get an InvalidOperationException statingThe model backing the 'BlogContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269). ...