问题描述
我已启用自动迁移.然后，我删除了整个数据库.接下来，我从命令控制台执行了Update-database，它重新创建了我的数据库.然后，我启动我的应用程序仅看到此错误:
I have enabled automatic migrations. Then, I deleted my whole db. Next, i executed Update-database from command console, and it recreated my db. Then, I started my application only to see this error:
那元数据到底是什么，我该如何指向它呢?
So what exactly is that metadata, and how can I point entity framework to it?
PS.我的数据库包含名为MigrationsHistory的表.
PS. My database contains table named MigrationsHistory.
推荐答案
这是我前一段时间写的解决此问题的可能方法的详细说明...
(不完全是您所经历的，因此本身并不是重复的，而是要考虑不同的情况)
Here is a detailed description of the possible ways to resolve this which I wrote a while ago...
(not exactly what you're experiencing, hence not a duplicate per se, but with different scenarios in mind)
https://stackoverflow.com/a/10255051/417747
总结...
这会创建一个带有迁移差异"的脚本，您可以 在目标服务器数据库上手动将其作为SQL脚本手动应用 应该插入正确的迁移表行等.
That creates a script with a 'migration difference', which you can manually apply as an SQL script on the target server database (and you should get the right migration table rows inserted etc.).
如果那仍然不起作用-您仍然可以做两件事...
If that still doesn't work - you can still do two things...
a)删除迁移表(目标-在系统表下)-按照 http: //blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-automatic-migrations-walkthrough.aspx 那里的评论-应该会退回到以前的行为，如果 您确定您的Db-s相同-这只是为了'信任 你，
a) remove the migration table (target - under system tables) - as per http://blogs.msdn.com/b/adonet/archive/2012/02/09/ef-4-3-automatic-migrations-walkthrough.aspx comments in there - that should fail back to previous behavior and if you're certain that your Db-s are the same - it's just going to 'trust you',
b)作为我最后使用的方法-创建一个Update-Database -Script 完整模式(例如，通过初始化一个空的db来强制执行 '完整脚本')，找到INSERT INTO [__MigrationHistory]记录， 只需运行它们，将它们插入数据库，并确保您的 数据库-和代码匹配，
b) as a last resort I used - make a Update-Database -Script of the full schema (e.g. by initializing an empty db which should force a 'full script'), find the INSERT INTO [__MigrationHistory] records, just run those, insert them into the database, and make sure that your databases - and code match,
应该使事情再次同步运行.
that should make things run in sync again.
如果有帮助
这篇关于EF代码优先-无法检查模型兼容性，因为数据库不包含模型元数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！