ebean query with subquery - sql

Question

I'm trying to do using EBean the equivalent of
select * from myTable1 where id not in (select id2 from myTable2) ;
I have no reference of table1 Object in table2 Object and the same the other way around.
Does anyone knows how to that using EBean ?
For the moment all I have is :
List<MyTable1> myResult = MyTable1.find.where().eq("id","1" ).findList();
Thanks.
C.C.

Answer 1

Apparently it has been possible to do this since 2009 using the example given in this bug report:
http://www.avaje.org/bugdetail-92.html
The example:
Query<Product> subQuery =
Ebean.createQuery(Product.class)
.select("sku")
.where().idEq(4).query();
List<MinCustomer> list = Ebean.find(MinCustomer.class)
.where().in("name", subQuery)
.findList();
However:
I am unable to make it work because the SQL generated is invalid. Seemingly due to a string replacement happening behind the scene in Ebean where (for me at least) the table name in the subquery is lost.
I expect it has to do with my main query includes a reference to the table from which my subquery "is selecting".
Turning the valid SQL from the example:
select c.id, c.name, c.notes
from o_customer c
where (c.name) in (select p.sku from o_product p where p.id = ? )
... into this invalid SQL in my case:
select t0.id as c0, ... t0.location_id as c8
from myRecordClass t0
where (t0.location_id) in (
select t0.id
from t0.location_id t0 # should be: from location t0
where t0.customer_id = ?
) and t0.creation > ?
order by t0.creation desc
The workaround:
Use the RawSql approach like in https://stackoverflow.com/a/27431625/190599 - example here:
String sql = "select b.id, b.location_id ... " +
"from myRecordClass b " +
"where location_id in (" +
"select id " +
"from location " +
"where customer_id = " + user.getCustomer().getId() +
") " +
"order by creation desc limit 10";
RawSql rawSql = RawSqlBuilder
.parse(sql)
.columnMapping("b.id", "id")
.columnMapping("b.location_id", "location.id")
....
.create();
Query<MyRecordClass> query = Ebean.find(MyRecordClass.class);
query.setRawSql(rawSql);
final List<MyRecordClass> list = query.findList();

Answer 2

I hardly believe that RawSql is fastest way to achieve this kind of query, it allows you to return list of mapped objects.
It's also possible to use SqlQuery (described in Reference guide (PDF)) to fetch a list of SqlRows - so you can find required data without any mapping at all.