How to delete data in DB efficiently using LinQ to NHibernate (one-shot-delete)
- by kastanf
Hello,
producing software for customers, mostly using MS SQL but some Oracle, a decision was made to plunge into Nhibernate (and C#).
The task is to delete efficiently e.g. 10 000 rows from 100 000 and still stay sticked to ORM.
I've tried named queries - link already,
IQuery sql = s.GetNamedQuery("native-delete-car").SetString(0, "Kirsten");
sql.ExecuteUpdate();
but the best I have ever found seems to be:
using (ITransaction tx = _session.BeginTransaction())
{
try
{
string cmd = "delete from Customer where Id < GetSomeId()";
var count = _session.CreateSQLQuery(cmd).ExecuteUpdate();
...
Since it may not get into dB to get all complete rows before deleting them.
My questions are:
If there is a better way for this kind of delete.
If there is a possibility to get the Where condition for Delete like this:
Having a select statement (using LinQ to NHibernate) = which will generate appropriate SQL for DB = we get that Where condition and use it for Delete.
Thanks :-)
