ef-database-first

问题 I'm using EF 6 database-first.. I use this method to get the name of the table: private static string GetTableName(ObjectContext context, Type entityType) { string entityTypeName = entityType.Name; EntityContainer container = context.MetadataWorkspace.GetEntityContainer(context.DefaultContainerName, DataSpace.CSpace); string tableName = (from meta in container.BaseEntitySets where meta.ElementType.Name == entityTypeName select meta.Name).First(); return tableName; } but it only returns the

问题 I was watching some videos and tutorials for EF 4.1, and I do not understand any benefit of CodeFirst (except some if DB is very small 3-4 tables and I am lazy for creating DB first). Mostly, the best approach so far is to create Database in some sort of Database editor, which is sure faster then editing in the Entity Model and EF picks up every relationships and creates associations correctly. I know there are challenges in naming convention etc, but I feel its very confusing to manage Code

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

问题 In every SQL table in our application we have "CreatedDate" and "ModifiedDate" column. We are using DB first approach. When i save the data, i want these two column automatically populated. One approach is to have Default Value as getdate() on the SQL Table Column itself. So thats going to solve the problem partially. Meaning it will set the CreatedDate & ModifiedDate when entity is new. However when i am editing/updating the entity i want only ModifiedDate to be updated. There are lot of

问题 In every SQL table in our application we have "CreatedDate" and "ModifiedDate" column. We are using DB first approach. When i save the data, i want these two column automatically populated. One approach is to have Default Value as getdate() on the SQL Table Column itself. So thats going to solve the problem partially. Meaning it will set the CreatedDate & ModifiedDate when entity is new. However when i am editing/updating the entity i want only ModifiedDate to be updated. There are lot of

问题 So here is the deal, I have changed my database schema, and changed the PK for one of my tables and I have removed everything related to the old PK (FK reference in another tables). However I have this exception when I insert a new entity using savechanges() method ex = {"An error occurred while updating the entries. See the inner exception for details."} And the inner exception is InnerException = {"Invalid column name 'Audit_ID'."} the Audit_ID is the old PK. I have tried this "Invalid

问题 This question already has answers here : Entity Framework: Ignore Columns (6 answers) How do you update an edmx file with database changes? (6 answers) Closed 3 years ago . I am working on a project which has a fairly complex database, and the code is stop-gap while another system overhaul is underway. I am fixing up some legacy code, and need to perform work quickly and use work-arounds wherever possible. There is an existing database and I am using EF6 Datbase First with much success.

问题 This question already has answers here : Entity Framework: Ignore Columns (6 answers) How do you update an edmx file with database changes? (6 answers) Closed 3 years ago . I am working on a project which has a fairly complex database, and the code is stop-gap while another system overhaul is underway. I am fixing up some legacy code, and need to perform work quickly and use work-arounds wherever possible. There is an existing database and I am using EF6 Datbase First with much success.