10:14 p.m.
A query validation bug produces QueryException: "Expected positional parameter count:
1, actual parameters: [Parent@bec357b] [from Child this where this.id.parent = ?]"
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Key: HHH-2254
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2254
Project: Hibernate3
Type: Bug
Components: query-hql
Versions: 3.2.0.ga
Environment: Hibernate 3.2 using Sybase. However this is not an environment caused
problem. It's supposed to happen in every environment.
Reporter: Hernan Liendo
-- Short description
============================================================================ --
A query validation bug produces QueryException: "Expected positional parameter count:
1, actual parameters: [Parent@bec357b] [from Child this where this.id.parent = ?].
Both Parent and Child use composite keys.
-- Context
====================================================================================== --
Having composite keys for a Parent class and a Child class, I want to retrieve childs that
belong to an specific Parent.
-- Parent Definition
============================================================================ --
public class Parent {
public ParentId ParentId;
...
}
public class ParentId {
private String idField1;
private int idField2;
...
}
// the parent mapping
<hibernate-mapping>
<class mutable="false" table="xx" name="Parent">
<composite-id class="ParentId" access="field"
name="parentId">
<key-property column="idField1" access="field"
name="idField1"/>
<key-property column="idField2" access="field"
name="idField2"/>
</composite-id>
</class>
</hibernate-mapping>
-- Child Definition
============================================================================ --
public class Child {
public ChildId childId;
...
}
public class ChildId {
public Parent parent;
public String aditionalIdField;
...
}
// the mapping
<hibernate-mapping>
<class mutable="false" table="yyy" name="Child">
<composite-id class="ChildId" access="field"
name="childId">
<key-many-to-one name="parent" class="Parent"
access="field">
<column name="idField1" not-null="true" />
<column name="idField2" not-null="true" />
</key-many-to-one>
<key-property column="aditionalIdField" access="field"
name="aditionalIdField"/>
</composite-id>
</class>
</hibernate-mapping>
-- HQL Statement
============================================================================ --
from Child this where this.childId.parent = ?
or
from Child this where this.id.parent = ? // using aliased id
-- The Exception
============================================================================ --
org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters:
[Parent@bec357b] [from Child this where this.childId.parent = ?]
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:319)
at org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:275)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:75)
...
-- The Problem
============================================================================ --
class: org.hibernate.impl.AbstractQueryImpl
method: protected void verifyParameters(boolean reserveFirstParameter) throws
HibernateException
line: 286
The method validates parameters. It resolves the "positionalValueSpan" variable
witch in my case gets the value of 2 (One for parent's idField1 and the other for
parent's idField2).
The method compares positionalValueSpan (2) with
parameterMetadata.getOrdinalParameterCount() witch it is 1 (the quantity of "?"
signs in the HQL statement".
This bug only happens when:
1. composed keys are used (and)
2. having a parent-child relationship (and)
3. resolving children from certain parent.
-- Hibernate user workaround
============================================================================ --
Not to use a parent instance variable in the Child class.
Hope this helps. If you guys need the source code in order to check the bug, please let me
know it. Good luck!
Hernan
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