NHibernate身份：int或long

Question

I begin my NHibernate mapping. In major cases I use int type but for some entities I need to persist million of objets. Is long type for identity will be the best choice ?

Answer 1

Int32 (or just int ) is fine for "millions." You only need to start thinking about Int64 ( long ) if you will have billions of rows.

A signed int can support IDs up to 2,147,483,647.

See Int32.MaxValue .

Answer 2

Int will work for values up to 2,147,483,647. That should be fine for "millions of objects."

For data ranges, see the Integral Types Table . If you really need more, you could use uint.