Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
495 views
in Technique[技术] by (71.8m points)

entity framework - Get Auto Identity Key after Insert via EF

Is there a straight forward way of retrieving a DB auto generated primary key when adding a record via Entity Framework 4.1?

For example:

dbcontext.Entity_Tables.Add(new Entity_Table { item1 = val1, item2 = val2 });
dbcontext.SaveChanges();
newPK = ???;

The SQL equivalent would be:

newPK = executeOnDB("INSERT INTO Entity_Table (item1, item2) VALUES (val1, val2);SELECT @@Indentity";);

BTW I'm using MySQL but the SQL would be the same as on MSSQL

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

I believe EF should update your entity object with the identity:

var entity = new Entity_Table { item1 = val1, item2 = val2 };
dbcontext.Entity_Tables.Add(entity);
dbcontext.SaveChanges();
int newPK = entity.ID;

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

2.1m questions

2.1m answers

60 comments

57.0k users

...