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Re: [eclipselink-users] EclipseLink alias naming and ordering
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To be clear, I am surprised the following query does not work for case related
reasons:
>> SELECT dePartment
>> From Department dePartment
>> LEFT JOIN FETCH dePartment.employees
>> LEFT JOIN dePartment.employees emps
JPQL, however is case sensitive in a number of ways
1. In the above query Department must match the Entity name (case sensitive)
2. In the above query the alias FROM clause, "From Department dePartment" must
be used with identical case in other parts of the query
3. The attributes must match the attribute names defined in the entity. i.e.
"dePartment.employees" will make a case sensitive match to the attribute
"employees" on the Department object.
Tom Ware wrote:
I am surprised you are getting an issue with #1 below, please file a bug
and include a recreation.
For your other issue, have a look at the following bug:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=303767
-Tom
janardhan n wrote:
I am having a strange problem with EclipseLink
For an Entity having collection
class Department {
List<Employee> employees;
List<Section> sections;
}
1. If I use the below query
SELECT dePartment
From Department dePartment
LEFT JOIN FETCH dePartment.employees
LEFT JOIN dePartment.employees emps
It is fetching only dePartment entities without the collection.
If I use alias name as department instead of dePartment(observe the
case of letter P)
Is the alias name case sensitive? sounds silly
2. If I use the below query
SELECT dePartment
From Department dePartment
LEFT JOIN FETCH dePartment.employees
LEFT JOIN dePartment.employees emps
LEFT JOIN FETCH dePartment.sections
LEFT JOIN dePartment.sections sects
Then it is fetching only first child collection.
If I change the join order like below,
SELECT dePartment
From Department dePartment
LEFT JOIN FETCH dePartment.employees
LEFT JOIN FETCH dePartment.sections
LEFT JOIN dePartment.employees emps
LEFT JOIN dePartment.sections sects
Then it is fetching both the child collections.
Is the order of join columns matter in EclipseLink?
3. Are the above said things are specific to EclipseLink or JPA
Conventions?
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