[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3908) Expose way to fully control fetching in native-sql queries in API
Expose way to fully control fetching in native-sql queries in API
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Key: HHH-3908
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3908
Project: Hibernate Core
Issue Type: New Feature
Components: core
Reporter: Steve Ebersole
Fix For: 3.5
Currently, in order to fully control fetching in native-sql queries, users must revert to
using a named sql query (at least the xml, not sure if the annotations variety supports as
well). We alreasy have all the objects/contracts in place to handle this for the named
queries, just need to clean-up and properly document them.
The current API calls to deal with this are the overloaded SQLQuery#addJoin methods.
Ideally I'd see these changed to return the representation of the join-fetch to be
configured; but addJoin already defines a return : the query itself :( So probably we
will need new methods like addFetch:
1) public JoinFetch addFetch(String alias, String ownerAlias, String ownerProperty)
2) public JoinFetch addFetch(String alias, String ownerAlias, String ownerProperty,
LockMode lockMode)
interface JoinFetch {
public void addPropertyMapping(String propertyName, String sqlAlias);
}
This can be expanded to the "root returns" as well (currently the overloaded
#addEntity methods):
public RootReturn addRoot(String alias, Class entityClass)
etc...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Example
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQLQuery query = session.createSQLQuery(
"select c.cust_id as cid, " +
" c.cust_name as cname, " +
" o.order_id as oid, " +
" o.order_num as onum " +
" from customer c " +
" inner join orders o " +
" on c.cust_id = o.cust_id"
);
query.addRoot( "c", Customer.class )
.addPropertyMapping( "id", "cid" )
.addPropertyMapping( "name", "cname" );
query.addFetch( "o", "c", "orders" )
.addPropertyMapping( "id", "oid" )
.addPropertyMapping( "orderNumber", "onum" );
...
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