Hi i have a simple question.

I have a next siplme mapping fragment



I'm using in my domain objects Set as collection object for contactdoctorSet as follows :



My question is : is possible to use List interface ?



is any difference for hibernate to use List or Set ? Or better is possible to use List instead of Set ? If no why ?

Thanks for help

If I am not mistaken you can use a java.ult.List contactdoctorSet (or perhaps contactdoctorList) but then your mapping would change too and would probably need to be <list ...... /> however with the list it creates a index_column in your database. You can avoid that by using <bag ..../> in your mapping which is just an un-indexed list.

There are slight performance differences with a List and a Set

Table 7.2. Relative Collection Performance
. Keys Indexed Lazy Insert Update Delete

Bag No No Yes High Poor Poor

List No Yes Yes Medium High Medium

Set No No No Medium High Medium


Hope this helps...

one more question about performance.

those values you had wrote r about java virtual machine or about how hibernate is working witch these types ?

I am not 100% sure, it simply says

The feature set shown has both functional implications and performance implications. Table shows a rough guide to the relative performance of the different collection types.