Member_2_8198376
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Adding a column to Sql Server with Entity Framework without dropping data
I've inherited a .NET Framework app with entity framework that uses code first to a SQL Server db.
I need to add a column to the table without destroying any of the old data.
I tried changing the code to insert into a new column and added a column manually, but I got a message stating that I had to add a column through code-first migration. (I'm new to Entity Framework.)
I read in a Microsoft Site that it is possible to modify the schema to keep the data:
"Explicitly modify the schema of the existing database so that it matches the model classes. The advantage of this approach is that you keep your data. You can make this change either manually or by creating a database change script."
I don't know if that is the only way to keep the data, or if there is a way to do that with Code First Migration. I also don't know which is easier or the advantages/disadvantages of either way. I've already made the change to the Model file.
Is there a way that I can change the connection string so that it recreates the database locally so that I can test it out?
Will the Package Manager Console command, "add-migration nameOfFile" drop any data?
If I change the existing schema, do I need to do anything else for Entity Framework to recognize the change?
thanks
I need to add a column to the table without destroying any of the old data.
I tried changing the code to insert into a new column and added a column manually, but I got a message stating that I had to add a column through code-first migration. (I'm new to Entity Framework.)
I read in a Microsoft Site that it is possible to modify the schema to keep the data:
"Explicitly modify the schema of the existing database so that it matches the model classes. The advantage of this approach is that you keep your data. You can make this change either manually or by creating a database change script."
I don't know if that is the only way to keep the data, or if there is a way to do that with Code First Migration. I also don't know which is easier or the advantages/disadvantages of either way. I've already made the change to the Model file.
Is there a way that I can change the connection string so that it recreates the database locally so that I can test it out?
Will the Package Manager Console command, "add-migration nameOfFile" drop any data?
If I change the existing schema, do I need to do anything else for Entity Framework to recognize the change?
thanks
ASKER
Hello Pushpakumara Mahagamage
Do I do that command in the Nuget Package Manager Console?
After I updated my Model class, I went to the Nuget Package Manager Console and I put:
Enable-Migrations –EnableAutomaticMigrations
Then, in the Nuget Package Manager Console and I put:
Update-Database
That worked.
.NET doesn't let me make changes directly to the database because the app was created Code First, unless there's some way that I don't know about.
Is your command something I put in the Nuget Package Manager Console ?
thanks,
Do I do that command in the Nuget Package Manager Console?
After I updated my Model class, I went to the Nuget Package Manager Console and I put:
Enable-Migrations –EnableAutomaticMigrations
Then, in the Nuget Package Manager Console and I put:
Update-Database
That worked.
.NET doesn't let me make changes directly to the database because the app was created Code First, unless there's some way that I don't know about.
Is your command something I put in the Nuget Package Manager Console ?
thanks,
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ALTER TABLE table name ADD colmn name DATATYPE