AssemblyWithMigrations

AssemblyWithMigrations

本文介绍了如何使用代码首次迁移创建数据库?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在使用ASP.NET MVC 3项目,它使用Entity Framwork 4.3及其迁移。现在我希望Entity Framework使用我已经有的迁移来为我创建一个数据库。
当我尝试运行Update-Database脚本时,它给出以下内容:




更新 - 数据库-Verbose - ProjectName AssemblyWithMigrations -StartUpProjectName WebProjectAssembly
在程序集'/ *中我没有找到迁移配置类型'/ *我的名称的组件* /'。 (在Visual Studio中,可以使用Package Manager Console中的Enable-Migrations命令添加迁移配置)。



但是,当我尝试运行启用迁移我看到以下内容:




项目AssemblyWithMigrations中已启用迁移。要覆盖现有迁移配置,请使用-Force参数。



所以,问题是EF试图解决当前的迁移版本来更新数据库,我想。但是数据库不存在,它显然是失败的。



问题是如何使用EF迁移创建数据库,如果不存在?或者,使用Nuget控制台做什么正确的方法?



总而言之,我想要什么:
1.运行命令(也许 update-database ),将使用我的web.config文件
创建数据库2.所有迁移将以创建顺序应用于创建的数据库。



谢谢。 :

解决方案

我意识到这是一个古老的问题,但是什么是... ...



要启用迁移以创建初始数据库,我发现以下功能很好。


  1. 删除数据库从SQL Server对象资源管理器中

  2. 从Migrations文件夹中删除所有现有的迁移。

  3. 在Package-Management-Console中键入添加迁移InitialCreate



    [可选,具体取决于您的数据库初始化程序]


  4. 在Package-Management-Console中,输入update-database

这将为您提供一个单一的迁移脚本,没有数据库使数据库与您当前的模型匹配。


I'm having ASP.NET MVC 3 project that uses Entity Framwork 4.3 and its migrations. Now I want Entity Framework to create a database for me using migrations that I have already.When I trying to run Update-Database script it gives me the following:

Update-Database -Verbose -ProjectName AssemblyWithMigrations -StartUpProjectName WebProjectAssemblyNo migrations configuration type was found in the assembly '/* my name of assembly */'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).

But, when I'm trying to run Enable-Migrations I see following:

Migrations have already been enabled in project 'AssemblyWithMigrations '. To overwrite the existing migrations configuration, use the -Force parameter.

So, the problem is EF trying to resolve current migration version to update database, I suppose. But database doesn't exist and it obviously fails.

The question is: how to use EF migrations for creating database if it doesn't exist? Or, what is the right way to do that using Nuget console?

In summary, what I want:1. run command (perhaps update-database) that will create database using my web.config file2. all migrations will be applied on the created database in their creation order.

Thanks. :)

解决方案

I realise this is an old question, but what the hell....

To enable migrations to create the initial database I've found the following works well.

  1. Delete your database from within SQL Server Object Explorer
  2. Delete all your existing migrations from within the Migrations folder.
  3. In Package-Management-Console type "Add-Migration InitialCreate"

    [optional, depending on your database initializer]

  4. In Package-Management-Console type "update-database"

This will give you a single migration script which will take you from "no database" to having a database that matches your current model.

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08-13 23:03