(1)Add-Migration InitialCreate (2) Update-Database -Verbose(自动迁移只需要执行这个) 如果只是修改了字段,执行这些命令会提示 Table 'XXXXXXXXXXXXXXXXXXX' already exists 表示这个迁移会执行建表操作,已存在导致迁移失败。 楼主解决方法如下: 输入get-help entityframeworkcor
(1)Add-Migration InitialCreate (2) Update-Database -Verbose(自动迁移只需要执行这个) 如果只是修改了字段,执行这些命令会提示 Table ‘XXXXXXXXXXXXXXXXXXX’ already exists 表示这个迁移会执行建表操作,已存在导致迁移失败。 楼主解决方法如下: 输入 1 get-help entityframeworkcore 获取指令帮助。 使用Script-Mig...
Model managed data Data can also be associated with an entity type as part of the model configuration. Then, EF Coremigrationscan automatically compute what insert, update or delete operations need to be applied when upgrading the database to a new version of the model. ...
上述代码中,通过调用table.UniqueConstraint方法,我们在Username字段上添加了一个唯一约束。 最后,执行以下命令将迁移应用到数据库: dotnet ef database update 1. 使用上述代码,我们成功地在数据库中设置了Username字段的唯一性约束。在尝试插入重复的值时,将会抛出异常。 3.2. 使用.NET Core属性设置字段不可重复 除了...
EF Core Update Database The following command results in the Up method of the migration class being executed with any changes applied to the database: Explain code | Copy code [Command line] dotnet ef database update [Package Manager Console] update-database Unless otherwise specified, all pe...
我正在从事asp.net核心项目,并且在代码优先的pattern.There中使用ef core2.0作为orm,这是我们需要访问的两个视图。下面的变通方法可以完成这项工作,但非常麻烦。create poco表示视图的结构有迁移do it's thing update-database in the db重命名已创建的表(在名称中添加_tbl )创建视图现在可以访问视图了,因为我们欺...
The result is a SaveChangesAudit entity with a collection of EntityAudit entities, one for each insert, update, or delete. The interceptor then inserts these entities into the audit database.Tip ToString is overridden in every EF Core event data class to generate the equivalent log message for...
As the database will create the key value (MagazineId), there’s no reason I’d have MagazineId as a parameter of such a constructor. Thanks to another new feature of EF Core 2.1, I no longer have to add a parameterless constructor to the class in order for queries to ...
EF Core Database First in Visual Studio Out-of-the-box Database First tooling in Visual Studio. Developer experience Make EF Core better Improve the developer experience be making many small improvements to EF Core Find out more and give feedback Your feedback on planning is important. Please...
Bug description Description: What happened, step by step: An entity and its navigation properties were queried from the database One of the navigation properties mistakenly was not included Changes were made against the main entity and s...