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实体框架6从数据库更新忽略已删除的列，键入更改

[英]Entity Framework 6 Update from Database ignores deleted columns, type changes

原文 2014-03-20 20:41:39 0 1 sql/ sql-server/ entity-framework

Am I missing something here? 我在这里错过了什么吗？

I've a .net 4.5.1 project with an Entity Framework model created from a SQL 2005 database (Connection type is SQL Server also), via "ADO.NET Entity Data Model". 我有一个.net 4.5.1项目，其中包含一个从SQL 2005数据库创建的实体框架模型（连接类型也是SQL Server），通过“ADO.NET实体数据模型”。

This works fine. 这很好用。 That is, until I update the database. 也就是说，直到我更新数据库。 If I add new tables or columns to existing tables all is well, but if I delete a column, the update just doesn't work properly. 如果我将新表或列添加到现有表中一切都很好，但是如果我删除了一列，则更新无法正常工作。 it also throws out errors when I alter the column type. 当我改变列类型时，它也会抛出错误。

This same problem was reported a long time ago: http://blog.jongallant.com/2012/08/entity-framework-manual-update.html#.UytNrvldVD0 , but it seems so ridiculous I can't believe I am not missing something. 很久以前就报道了同样的问题： http ： //blog.jongallant.com/2012/08/entity-framework-manual-update.html#.UytNrvldVD0 ，但它似乎太荒谬我不敢相信我不是遗漏了什么。 Surely I'm doing something wrong? 当然我做错了什么？ How can I get the model to update properly? 如何让模型正确更新？

1 个解决方案

I have the same problem. 我也有同样的问题。 I opened up the Model, removed the changed tables from the diagram, then Updated from the Database and re-added the tables. 我打开了模型，从图中删除了已更改的表，然后从数据库中更新并重新添加了表。 EF brought the table back in again with the correct structure. EF以正确的结构再次将桌子带回来。 Save The model, Rebuild the project, everything turns up as expected. 保存模型，重建项目，一切都按预期进行。

I am not sure why it doesn't detect the deleted columns. 我不确定为什么它没有检测到已删除的列。 I believe there's also issues if you change the data type of the columns, but I've not tested it. 我相信如果您更改列的数据类型也存在问题，但我没有对其进行测试。 But the above solution has worked for me so far. 但到目前为止，上述解决方案对我有用。