[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2776) Restrictons.in(..) generates invalid SQL if list of values is empty
Diego Pires Plentz (JIRA)
noreply at atlassian.com
Wed Aug 15 16:08:13 EDT 2007
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_27852 ]
Diego Pires Plentz commented on HHH-2776:
-----------------------------------------
I think that is more logic to throw IllegalArgumentException if List.size()==0.
> Restrictons.in(..) generates invalid SQL if list of values is empty
> -------------------------------------------------------------------
>
> Key: HHH-2776
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2776
> Project: Hibernate3
> Issue Type: Bug
> Components: query-criteria
> Affects Versions: 3.2.2
> Environment: Hibernate 3.2.2.ga, MySQL 4.1.18, Windows XP
> Reporter: Adrian Smith
>
> I have classes called A and B. There is a 1:n relationship from A to B.
> Class B has the following in its mapping file:
> <many-to-one name="a" class="A" column="fk_a_id" not-null="true" />
> If I write the following code:
> List<B> foo() {
> List<A> aList = ....
> Session session = ....
> Criteria query = session.createCriteria(B.class);
> query.add(Restrictions.in("a", aList));
> return query.list();
> }
> Then all works fine and the results I want are returned. However, if aList is empty (i.e. aList.size()==0) then the query.list function generates and executes invalid SQL for MySQL.
> java.sql.SQLException: Syntax error or access violation message from server: "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1"
> I imagine that it is generating SQL like IN () which isn't valid.
> I realize it's a bit ridiculous to want to find the rows where a field is IN the empty list. Nothing will ever be returned. However, in my opinion it should still be allowed, and return no rows, just as saying "WHERE 1=2" is allowed, just doesn't return any rows.
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