I have an existing Oracle database with a table that does not have any primary key. I am using Entity Framework Core database-first approach to generate the classes and the DbContext, but I am not able to generate it since a table does not have primary key.
Is there any way it can be generated so that it can be used in EF Core?
Related
I want to utilize the capability of EF to populate an entity from calling a stored procedure, but this entity does not need to map to a physical table, as it only exists in my application.
Is it achievable?
Many thanks.
Is there a way to add/delete columns in the database using database-first approach in Entity Framework? I know we can do this by doing code-first approach.
I modeled a database with primary keys, foreign keys and unique indexes by using MySQL Workbench. I synchronized my model file with MySQL database and then created a console project in Visual Studio 2012. After that, i added a data entity model with an existing database. There is no problem. To understand if does entity framework create database successfully, i deleted the database. Then i ran the console program, database created successfully but unique indexes couldn't be exported to db. How can i solve this problem?
EF doesn't support unique keys. Unique keys are not used in the model and because of that it also doesn't create them when creating database from model. The only exception is manual creation of unique keys either through custom database intializer or migration (both are used in code-first approach).
I'm using VS2012 and creating a sample Entity Framework project that reads and writes to some tables that are used for import purposes. and do not have PK's or FK's in them - just null/notnull on the columns.
Can/should EF be made to insert records on these tables without that cryptic error:
Unable to update the EntitySet because it has a DefiningQuery
and no element exists in the
element to support the current
operation.
Or should I be looking elsewhere for database I/O?
Thanks!
Corey.
We are testing EF 4.1 against DB2 tables on a Main Frame.
We are now able to generate EF models from DB2 tables and retrieve data :)
When we generate the EF model some relationships are included in the model and some are missing. It appears that the ones that are missing are composite keys.
Is this a limitation in EF that it is not able to handle composite keys?
Is it possible add the relationship manually to the model?
We fixed this by manually editing the edmx files.