HQL查询上的HashSet排序期间的休眠异常：org.hibernate.exception.SQLGrammarException：无法使用滚动执行查询

Question

I'm trying to get a list of items ordered through an HQL query . The problem is that the sort is done on a HashSet of objects(orber by ab.clienti.errIndirizzos, where errIndirizzos is HashSet set on class Clienti ), and when I try to do the sorting hibernate returns an exception

Clienti.java:

public class Cliente implements java.io.Serializable {
//declaration var
private Set errIndirizzos = new HashSet(0);`
.....
}

Cliente.hbm.xml

<set name="errIndirizzos" inverse="true" >
     <key>
         <column name="ID_CLIENTE" precision="18" scale="0" />
     </key>
     <one-to-many class="ErrIndirizzo" />
</set>

where table ERR_INDIRIZZO and CLIENTE have unique key "ID_CLIENTE"

HQL Query order by:

order by le.cliente.errIndirizzos

where le is another table that contain Clienti

LetteraCliente.java

public class Letteracliente implements java.io.Serializable {
.....
private Cliente cliente
......
}

letteraCliente.hbm.xml

<one-to-one name="cliente" class="it.allianz.images.bean.postaMassiva.Cliente" constrained="true"></one-to-one>

Error:

org.hibernate.exception.SQLGrammarException: could not execute query using scroll

Any suggestion? thanks in advance

Answer 1

Try using implicit joins instead:

select distinct le
from Letteracliente le
inner join le.cliente c
inner join c.errIndirizzos e
order by e.id

Using INNER JOIN will also filter all Letteracliente without Cliente or ErrIndirizzo . You can choose some other property for the ORDER BY, if the id is not what you wanted.