LEFT Join « Map « JPA Q&A





1. Left outer join fetch doesn't fill map collection properly (HQL)    stackoverflow.com

I've got classes with mappings like this:

@Entity
public class CurrencyTable {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE)
    private Long id;

    @Version
  ...

2. Hibernate Child Collection Limited When Using Left Join in Criteria    stackoverflow.com

When using hibernate criteria just altering the join type affects the results of the child collections of the root domain class. For instance, having class Parent have a one-to-many relationship with class ...

3. HQL left join where left is null    stackoverflow.com

how to write this query on HQL:

select pp.* 
from Part pp
 left join Product p on pp.ProductID = p.ID
where p.ID is null
i need parts without products. Part has property Product (many-to-one) I ...

4. Left Outer Join in HQL without mapping    forum.hibernate.org

Hi, I have a issue with left outer join without a direct mapping between two tables. For example if i hv Table A Id Code 1 AAA 2 BBB 3 CCC Table B Id Label 1 XYZ 3 QWE 4 RTY And there is no relation between two tables. The following HQL is inner join by default because of "from A ...

5. how to use left joins with class mappings (many-to-one)    forum.hibernate.org

I'm working w/legacy data. One table (A) has a foreign key (with possible empty string values) that maps to a row on another table (B) Here are the mappings: (A) (B)

6. Inheritance and Left Outer Joins Generating Large Queries    forum.hibernate.org

We have an inheritance relationship that has a base class with many (20 or so) derived classes. When querying on the base class, we see Hibernate automatically generating a left outer join to determine the subclass. The query generated is massive because it lists all columns on all tables. We haven't experienced any problems yet, but are concerned that we may ...

7. left join fetch doesn't init map on no results    forum.hibernate.org

Hibernate version: 3.0 alpha Name and version of the database you are using: hsql 1.7.2.4 I have a one-to-many association setup as a lazy map. Works great except for one bit of strangeness. When I perform a left join fetch on the map, and there are no child results, the map is not flagged as initialized. So I get a second ...

8. Left join fetching and duplicated _child_ objects    forum.hibernate.org

Hi, when running this HQL query: from Rule r left join fetch r.type t left join fetch t.featureAttributeList attribute left join fetch attribute.enumerationValues left join fetch r.objectConditions oc left join fetch oc.geometryConditions left join fetch oc.attributeChecks where r.id = ? I got a list of duplicated Rule objects, and this is expected, but I also got duplicated items in the featureAttributeList ...

9. LEFT OUTER JOIN subcriteria filters children - bug???    forum.hibernate.org

Regular Joined: Thu Nov 13, 2003 2:55 am Posts: 70 Location: Sweden When using the Criteria API with LEFT OUTER JOIN to add criterias to the children, the collections will only contain those children matching the criteria. (I am *not* using any filters) Why is this? Am I doing something wrong, or is this a bug? Is there a workaround? Hibernate ...





10. LEFT JOIN use: WHERE inside of childs collection's mapping    forum.hibernate.org

Hello everybody, I have the following problem: There is a parent class (let's name it "PARENT") which has a one-to-many relationship to a child class (let's name such a class as "CHILD"). So, a PARENT instance contains a Collection with CHILDs (let's name the collection class property as "childs"). Such a collection is specified in the Hibermnate-config file for PARENT like ...

11. Left outer join with HQL on tables that are not mapped    forum.hibernate.org

Hi, I need to create an hql query that does a left outer join on from table A to table B, while the two tables are not mapped with hibernate. I can easily do this with sql: select A.a_field, B.another_field from A left outer join B on id = ext_id However, it seems that the HQL syntax does not support the ...

12. HOW TO?: HQL query/mappings to make SQL JOIN LEFT ON?    forum.hibernate.org

Thanks to all who replied. Much appreciated. I found the answer myself after a good night's sleep. Here it is for anyone interested. (I'm sure there is more than one way to solve this) 1. Keep the hibernate mapping files as they are. That is MovieGenre has the association mappings and Movie and Genre only have simple property mappings. 2. The ...

13. Join Left - without mapping many-to-one    forum.hibernate.org

Author Message ledomi Post subject: Join Left - without mapping many-to-one Posted: Wed Jul 25, 2007 9:45 am Newbie Joined: Wed Mar 14, 2007 6:25 am Posts: 7 Hello, I'm trying to do a left join without mapping java object (relation one-to-many in hibernate-mapping). And I don't found any issue... - I try to use specific operators: =* and ...

14. HQL left join child problem    forum.hibernate.org

15. Left Join and OneToOne mapping    forum.hibernate.org

Author Message nezubitto Post subject: Left Join and OneToOne mapping Posted: Mon Sep 17, 2007 8:16 pm Newbie Joined: Mon Sep 17, 2007 7:26 pm Posts: 1 Hibernate version: 3.2.5.ga I am trying to perform a left join on a one-way one-to-one mapping using the side of the mapping without the reference as the base table. My problem is ...

16. How to Write the Mapping For Left Join pls help me    forum.hibernate.org

This is my Query : ------------------ "select a.Langu,v.Languid,v.Descr from Sjx_cfg_langu a left join Sjx_cfg_langut v on a.Langu=v.Langu and v.Languid='en' " And this is my Parent Mapping File: --------------------------------- Child Mapping File : ------------------





17. Left outer join fetch doesn't fill map collection properly.    forum.hibernate.org

@Entity public class CurrencyTable { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE) private Long id; @Version @Column(nullable=false) private Timestamp version; @Column(length=32, unique=true) private String refCode; @OneToMany(mappedBy="currencyTable", fetch=FetchType.LAZY, cascade = {CascadeType.ALL}) @MapKey(name="currency") ...