Question

How can I retrieve an id from a row that I’ve just written to the database?

Basically, I have a function in my ASP.NET a booking form that needs to write to two tables, but I need the id from what’s been written in table 1, to also be store in table 2.

So:

1. write to table 1
2. retrieve id from table 1
3. write to table 2

How can I achieve this?

Regards
Tea

Answer 1

In Asp.Net with a Sql 2008 server, you can use the ExecuteScalar function like this:

string query = "INSERT INTO Table1 (id_field) 
                OUTPUT SCOPE_IDENTITY()
                VALUES (...)";

OR

string query = "INSERT INTO Table1 (...) VALUES (...); SELECT SCOPE_IDENTITY() ";

In the last example, notice I’m performing an INSERT and then a SELECT in the same request…

And to get the identity use:

int lastId = (int)command.ExecuteScalar();