How can I do this all in one query? Nhibernate - nhibernate

Question

I have a list of Ids and I want to get all the rows back in one query. As a list of objects(So a List of Products or whatever).
I tried
public List<TableA> MyMethod(List<string> keys)
{
var query = "SELECT * FROM TableA WHERE Keys IN (:keys)";
var a = session.CreateQuery(query).SetParameter("keys", keys).List();
return a; // a is a IList but not of TableA. So what do I do now?
}
but I can't figure out how to return it as a list of objects. Is this the right way?

Answer 1

List<TableA> result = session.CreateQuery(query)
.SetParameterList("keys", keys)
.List<TableA>();

Answer 2

Howeever there could be a limitation in this query if number of ":keys" exceed more than 1000 (incase of oracle not sure with other dbs) so i would recommend to use ICriteria instead of CreateQuery- native sqls.
Do something like this,
[TestFixture]
public class ThousandIdsNHibernateQuery
{
[Test]
public void TestThousandIdsNHibernateQuery()
{
//Keys contains 1000 ids not included here.
var keys = new List<decimal>();
using (ISession session = new Session())
{
var tableCirt = session.CreateCriteria(typeof(TableA));
if (keys.Count > 1000)
{
var listsList = new List<List<decimal>>();
//Get first 1000.
var first1000List = keys.GetRange(0, 1000);
//Split next keys into 1000 chuncks.
for (int i = 1000; i < keys.Count; i++)
{
if ((i + 1)%1000 == 0)
{
var newList = new List<decimal>();
newList.AddRange(keys.GetRange(i - 999, 1000));
listsList.Add(newList);
}
}
ICriterion firstExp = Expression.In("Key", first1000List);
ICriterion postExp = null;
foreach (var list in listsList)
{
postExp = Expression.In("Key", list);
tableCirt.Add(Expression.Or(firstExp, postExp));
firstExp = postExp;
}
tableCirt.Add(postExp);
}
else
{
tableCirt.Add(Expression.In("key", keys));
}
var results = tableCirt.List<TableA>();
}
}
}