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Hello Hibernate Experts,
i would very much appreciate your help in transforming the following SQL statement to a valid HQL Statement. I tried for hours but was not successfull:
SELECT * FROM master as m left outer join (select * from child as c where ...
Started by Markus on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
The query could be something much simpler, like:
SELECT m.id, max(c.id) FROM master as m left join; ):
SELECT new Master(m.id, max(c.id)) FROM master as m left join m.childs as c group by m.id
2 that formulas take SQL, not HQL.
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Hello, I'm starting to work with hibernate. I'm quite confused about HQL joins... they are really different from, say, mySQL joins... In fact if I have two tables like Parking and Auto I would do:
select * from Parking left join on Parking.pid = Auto....
Started by gotch4 on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
In HQL, the query might be the following :
from Shirt shirt join shirt.availableSizes size where size.number > 40
In other words, you want to get all the objects, but you need ....
A query to find all the shirt models with sizes over 40 .
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I have 2 domain classes with a many-to-many relationship in grails: decks and cards.
The setup looks like this:
class Deck { static hasMany = [cards: Card] } class Card { static hasMany = [decks: Deck] static belongsTo = Deck }
After I delete a deck, ...
Started by David Chanin on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
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Ask your Facebook Friends
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Is it possible to perform a left join between two tables that are not related each other through a parent-child or many-to-many relationship ?. All the samples I found around only show those scenarios.
I have the following tables,
Sync -> Id (string...
Answer Snippets (Read the full thread at stackoverflow):
This is not a left join I know, but it might give some pointers:
http join in NH, and be aware that there are caveats to the....
HQL is object-oriented and only knows about of the SQL query.
To my knowledge, you can't do this directly.
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I have a many-to-one association set up like this, in the hbm.xml:
<many-to-one name="gigVenue" class="blah.blah.xxx" fetch="select" lazy="no-proxy" not-null="true" > <column name="N_VENUE_ID" precision="18" scale="0" not-null="true" /> <...
Started by Gilgad on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Using join fetch in HQL will also work in this case, fetching questionable....
Using HQL join fetch will NOT populate such a property; you have you access one of GigVenue 's methods.
And is not something that is commonly used.
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Hi,
I am modifying an existing HQL query which returns individual columns rather than an object graph but now I am not getting all rows that I need.
Here a few facts about the current schema:
An Estimate belongs to a Contract. The OwningDepartment property...
Started by James on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Besides that, you don't provide it out: d.ParentBusinessStream.Title is an implicit inner join but since d can be null it doesn't.
Which gives you access to proper SQL syntax as well as some HQL power.
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Is there a way to create a Distinct query in HQL. Either by using the "distinct" keyword or some other method. I am not sure if distinct is a valid keywork for HQL, but I am looking for the HQL equivalent of the SQL keyword "distinct".
Started by Mike Pone on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
(Names have been changed to protect identities)
String queryString = "select distinct f from Foo f inner join foo.bars as b" + " where f.creationDate >[] {startDate, endDate, bar});
It's worth noting....
Here's a snippet of hql that we use.
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What are the pros and cons of using Criteria or HQL? The Criteria API is a nice object-oriented way to express queries in Hibernate, but sometimes Criteria Queries are more difficult to understand/build than HQL.
When do you use Criteria and when HQL?...
Started by cretzel on
, 10 posts
by 10 people.
Answer Snippets (Read the full thread at stackoverflow):
HQL respects or one-to-one association....
Criteria is an object also completely respect the fetching strategy (join vs select vs subselect).
For different join types.
Also, HQL is a bit more powerful, I think, e.g.
HQL.
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Hi everyone ,
i am new at Java , i got a problem like this ; i have got a desktop application , there is 2 jComboBox in JFrame.One of this jComboBox is hold Personels from Personel Table and another is take Personel's title.When jComboBox1's selected ...
Started by Ibrahim AKGUN on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
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I have some entity:
public class Album extends GenericAuditedEntity { @OneToMany(fetch = FetchType.LAZY) private Set<Item> itemSet = new HashSet<Item>(); }
And when i run HQL like this: em.createQuery("select a from Album a").getResults()
...
Started by Max on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Set fetch type to eager
You need to use join fetch :
em.createQuery("select a.id, b.id from Album a left join fetch Item i ").getResults();
Note that there are certain side effects to that, described in detail the....
Dont use lazy fetching.
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