relation 1 « Map « JPA Q&A
1. How to work around a potential performance issue when using a Grails hasMany relation? stackoverflow.comGiven the following domain classes: |
2. Hibernate: Mapping User-Friends relation in Social Networks stackoverflow.comIt's quite some time that I'm trying to figure out this problem and from googling around many people have similar problems. I'm trying to model a User in a Social Network, using ... |
3. Two-way relation in JPA stackoverflow.comI have the two entity classes, User and MyCharacter. User has a list of MyCharacters and each MyCharacter has a reference back to the User (owner). What I'd like to accomplish ... |
4. Hibernate with relations stackoverflow.comI have a relational DB, contains tables and all kinds of relations(1>n, n>1, 1>1 and n>n).. Let's take one of these tables which is "Department" table, this table is the most complicated ... |
5. How to update a collection-type relation with mappedBy in Hibernate? stackoverflow.comI have two related entities, say |
6. Hibernate: bad performance when removing element from many-to-many relation stackoverflow.comI have to Classes (UserSet and User) which have a many-to-many relation (i.e. every user can belong to some UserSets). In the database there is a UserSet Table, a User Table ... |
7. How to do many-to-many relation between the same entity stackoverflow.comI have an Employee entity class with (Id,Name,EmployeeType). EmployeeType entity (Id, Description) where Description can be either REGULAR/MANAGER. I am confused on how to map Employees who are of type REGULAR ... |
8. Hibernate ManyToOne relation to a joined subclass type stackoverflow.comI have the following structure: |
9. Does Hibernate's Criteria API still not support nested relations stackoverflow.comI'd like to use Hibernate's Criteria API for precisely what everybody says is probably its most likely use case, applying complex search criteria. Problem is, the table that I want ... |
10. Hibernate @ManyToMany delete relation problem stackoverflow.comI have 2 entities: User and UsersList. |
11. Making a OneToOne-relation lazy stackoverflow.comIn this application we are developing, we noticed that a view was particularly slow. I profiled the view and noticed that there was one query executed by hibernate which took 10 ... |
12. JPA one-to-many relationship question (relations on one entity) stackoverflow.comIn this JPA example there is a code: |
13. Use fewer columns on SQL query through Hibernate Projections on Entity with ManyToOne relation stackoverflow.comI'm trying to build a smaller SQL, to avoid the "select * from A" that is being build by default for hibernate Criteria. If I use simple fields (no relation), through "Transformers", ... |
14. PSQLException: ERROR: relation "TABLE_NAME" does not exist stackoverflow.comI am trying to run hibernate on a PostgreSQL 8.4.2 DB. Whenever I try to run a simple java code like: |
15. hibernate: how to setup on-delete="cascade" in one-to-one relation stackoverflow.comi have to table relation one-to-one: message & scheduled_message my hibernate config |
16. Relation many-to-many with attributes : how? stackoverflow.comExcuse me for my poor english in advance as it is not my mother tongue. |
17. Hibernate and parent/child relations stackoverflow.comI'm using Hibernate in a Java application, and i feel that something could be done better for the management of parent/child relationships. I've a complex set of entities, that have some kind ... |
18. ManyToMany Relation does not create the primary key stackoverflow.comI have a ManyToMany relationship between two classes: ClassA and ClassB, but when the table for this relationship (table called objectA_objectB) there is no primary key on it. In my ClassA I ... |
19. Hibernate: order multiple one-to-many relations stackoverflow.comI have a search screen, using JSF, JBoss Seam and Hibernate underneath. There are columns for A, B and C, where the relations are as follows: A (1< -- >) B (1< ... |
20. Hibernate + PostgreSQL : relation does not exist - SQL Error: 0, SQLState: 42P01 stackoverflow.comI am having some problems trying to work with PostgreSQL and Hibernate, more specifically, the issue mentioned in the title. I've been searching the net for a few hours now but ... |
21. JPA map relation entity parentID stackoverflow.comcould someone help me to understand how can I define an entity with JPA mapping that has a relation with it self? For example, my entity is CompanyDivision, divisionA contains divisionB, divisionC and ... |
22. How to configure Hibernate database reverse engineering tool to map database table relation as a entites inheritance? stackoverflow.comIs it possible to configure Hibernate reverse engineering and code generation tool in such a way that one-to-many relation between tables is mapped to entities inheritance instead of enrites relation? I have ... |
23. JPA joined column allow every value stackoverflow.comI'm testing JPA, in a simple case File/FileVersions tables (Master/Details), with OneToMany relation, I have this problem: in FileVersions table, the field "file_id" (responsable for the relation with File table) accepts ... |
24. How to retrieve row count of one-to-many relation while also including original entity? stackoverflow.comSay I have two entities |
25. JPA OUTER JOIN without relation stackoverflow.comI need make OUTER JOIN of two entities in JPA (saying master, detail), but the problem that at the entity level there are no relations (and i don't want add it). |
26. How to get Hibernate object relations dynamically? stackoverflow.comI'm using Hibernate and I need to find a way of retrieving the relations for an object dynamically at run-time. I can't find this in the API. Can anyone point me in ... |
27. How to represent a 3-way relation with JPA? stackoverflow.comA user may have several labels, and links. Then, a user associates a label (or more) to a link. How does one represent the later relationship? A solution could be a many-to-many ... |
28. What's the best way to index many-to-one relation with hibernate search? stackoverflow.comI have an entity with many-to-one mapping. (Product 1-* Regions, unidirectional association) What is the best way to store index of such relation? So it can be easily used to filter search ... |
29. Hibernate criteria distinct with join - fetch the relation stackoverflow.comI've searched on the internet but I didn't understand very much the problem: I'm trying to build a distinct query using criteria and a distinct clause using a projection, trying to resole ... |
30. Hibernate -> n:m relation -> problem insert in a joined table stackoverflow.comI have a bidirectional n:m relation with two entities and I have created domain objects for using with Hibernate in the latest version 3.5.3. I used this for my example: http://tadtech.blogspot.com/2007/09/hibernate-annotation-many-to-many-join_03.html My ... |
31. Hibernate Envers - traversing the relations stackoverflow.comIn my application, I have a several audited entity classes for example the following.
@Entity
@Audited
public class Entity implements Serializable {
... |
32. Problem with parent/child relation with hibernate stackoverflow.comI am facing a problem with parent child type relations. |
33. Hibernate - encrypted reference by relations on usernames stackoverflow.comI was wondering if my idea is possible with hibernate. What I want is that there is one table with usernames and every table wich has a reference to this table ... |
34. Can't create a Many-To-One relation with all-delete-orphan cascade. MySQL says a foreign key constraint fails when deleting the parent stackoverflow.comI started using Hibernate recently and I'm still a newbie, however, the error I'm facing doesn't seem to be simple. My current environment is:
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35. JPA: How to have one-to-many relation of the same Entity type stackoverflow.comThere's an Entity Class "A". Class A might have children of the same type "A". Also "A" should hold it's parent if it is a child. Is this possible? If ... |
36. Moving a database with pg_dump and psql -U postgres db_name < ... results in "ERROR: relation "table_name" does not exist" stackoverflow.comI moved my PostgresQL database from one hard drive to another using |
37. Netbeans code for Postgresql and Eclipselink - identifying relation question stackoverflow.comI have the following database tables:
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38. parent-child relation, cascade-save with generated parent-key as foreign key in child table stackoverflow.comI have two tables in parent child relation. Parent can have multiple child records. Primay key of parent table is generated by hibernate, this generated primary key of parent table is foreign ... |
39. ManyToMany relation with jointable stackoverflow.comCategory EJB |
40. Finding the row with matching relations using HQL stackoverflow.comI am using Castle ActiveRecord and NHibernate. I have an Instance class which has a many-to-many relationship with a Component class. I would like to find the instance which is related ... |
41. Mapping same class relation stackoverflow.comHi I’m trying to map some classes in hibernate there and have general problem how such mapping can be done. There is User class and Facebook user class which has the ... |
42. How to handle JPA Many-to-One Relation? stackoverflow.comI am designing an application for collecting weather data. I have 2 POJO objects "Location" and "Record". Location contains information about latitude and longitude and the current weather conditions, and Record ... |
43. Mapping same class relation - continuation stackoverflow.comThis post is an continuation of this post I have DlUser Class each object of this class may have DLFaceBook class and each object of DlFaceBook can have Friends which are ... |
44. Creating a many-to-many relation between an entity and an another many-to-many relation with (N)Hibernate stackoverflow.comI'm trying to create a many-to-many association between an entity and another many-to-many association. How can that be done? I followed the Customer/Order/Product example to attach custom properties to a ... |
45. jpa/hibernate drag-n-drop/orm/graphical relations stackoverflow.comHey all, I'm reviewing the IntelliJ ability related to JPA ER Diagrams (http://www.jetbrains.com/idea/features/jpa_hibernate.html), and is something I've been looking for a while. Does anyone know of other tools that have similar abilities, whether ... |
46. Hibernate -> LazyInitializationException with n:m relation stackoverflow.comI have a problem with Hibernate and the LazyInitializationException. I searched and find a lot of answers, but I can not use them to solve my problem, because I have to ... |
47. Can't create grails Criteria query containing a belongsTo relation stackoverflow.comI've been trying to create a criteria builder containing a belongsTo relation and have yet to succeed. Consider the following model: |
48. How to cascade delete an entry without cascading into ManyToMany relations stackoverflow.comI have a piece of code that 'updates' an entry in the database by first cascade deleting it, and then replacing it with a new object, because I had a lot ... |
49. Java: Objects relations with criteria (hibernate) stackoverflow.comI have a problem with criteria and relation between objects. I present a simple scheme before: I have 2 objects: A is the parent B is the child with a link at parent. I know how ... |
50. JPA/Hibernate: ManyToMany delete relation stackoverflow.comI have two classes, say Group and Person with a ManyToMany-Relation that is mapped in a JoinTable. If I delete a Person that has a relation to a Group, I want ... |
51. Is it possible to have @OneToOne relation between 2 objects but not having the child automatically persisted in Hibernate stackoverflow.comI'm using jpa persistance annotations. I have 2 objects, Order(parent) and Transaction(child). I want to be able to fetch my oder and get its transaction. The problem is I don't want ... |
52. JEE6 JPA 2 ManyToOne Relation Creates Invalid Foreign Key stackoverflow.comI am trying to create two entities where both entities have embeddedIds. One of the entities have 2 references to the other entity, where both of those references are related as ... |
53. Hibernate Search and Relations stackoverflow.comI have an object called |
54. Eclipse Dali can not find table relations for MS SQL Server stackoverflow.comI am using eclipse dali to generate jpa entities .. It works fine for Oracle, but for MS SQL Server , Dali can not find relations between tables, therefore the generated ... |
55. How to select property from an entity in a hibernate relation stackoverflow.comI have an entity class set up in Java, with a many-to-many relationship to another class. However, rather than selecting the entire entity collection, I'd like to select only a property ... |
56. Cannot remove entity which is target of @OneToOne relation stackoverflow.comI have following entities with @OneToOne relation: |
57. Problem with retrieving data from 2 tables when having third table between them for history relations stackoverflow.comSo i have 3 tables:
Table: User |
58. hibernate second level cache and one to one relation stackoverflow.comI have an entity that I'd like to cache in the 2nd level cache, but it is updated frequently(via hibernate) and this makes it a poor candidate for the 2nd level ... |
59. DO i manually need to create relation table in hibernate stackoverflow.comIf i have two tables |
60. Do i always need to create separate class for manytomany relation in hibernate stackoverflow.comI was reading this article http://www.mkyong.com/hibernate/hibernate-many-to-many-relationship-example/ But he created three classes |
61. JPA Save non owning side of ManyToMany Relation stackoverflow.comI have a question about how to save M2M relations. One side must be always the owning side. In our scenario we have a entity "Role" and a entity "User". A ... |
62. JPA entity relations are not populated after .persist() stackoverflow.comthis is a sample of my two entities: |
63. Using flex and java, how to fill a datagrid when entity has a relation(one-to-many or any other) stackoverflow.comI am using flex4 on the frontend, and java spring services on the backend. When I follow the tutorials, I can get entities from db (mysql5.0) and fill the datagrid provided by ... |
64. Problem in Mapping many-to-one relation in Hibernate stackoverflow.comWith respect to my previous post Previous Post I have a Parent table A and its Child table B. Relation of A to B is one-to-many where as of that of B ... |
65. Can I create an attribute without relation with DB Table in a Entity? stackoverflow.comCan I create an attribute without relation with DB Table in a Entity ? If it can, which annotation should I use ? |
66. No relations in entity classes created with NetBeans from database stackoverflow.comI'm using Netbeans to create entity class from database, I select all table in my database and the classes are created without any information about relations, like @OneToMany, @ManyToOne etc... This is ... |
67. How to map a ManyToMany reflexive relations ship with extra coloumn in JPA stackoverflow.comI'm trying to map a USER/FRIEND relation ships using JPA over Hibernate. The ralation ship have an extra coloumn friendShipStatus that describe if the requested frien has accepted on not the ... |
68. Hibernate Map an object without relation stackoverflow.comI have a situation where i have relations like this: A person has one or more addresses. A customer has one or more addresses. Person,customers and addresses are separate tables. I used to do this ... |
69. unidirectional one-to-many relation without join table stackoverflow.com |
70. @OneToOne relations hibernate question stackoverflow.comI'm working in a project using Hibernate +JPA. I have this Entity class: |
71. Hibernate JPA2 - n+1 select problem affects only one side of OneToOne relation stackoverflow.comI was not getting lazy loading on either class until I added bytecode instrumentation via: |
72. @ManyToOne relation never read stackoverflow.comI have to implement parent-child tree with EclipseLink. The following code compiles Ok, reasonable DDL code is auto-generated, but the children field always resolves to an empty set, and tracing shows that ... |
73. JPA : relation with other column than id stackoverflow.comWhen I do a relation one to one with to entities, JPA use the id to register the target ; but I should want an other column. How is possible ? For ... |
74. Hibernate Many to Many relation stackoverflow.comI have a problem with Hibernate many to many relationship. In the project has two persistence class named Student and Course. I configure both classes with many to many relationship. Thats ... |
75. Insert one-to-many relation using hibernate stackoverflow.comWhat is the best way to insert data using Hibernate? As a example when I wont to insert new Order into order table. It has one-to-many relationship with Item. when we ... |
76. Transitive relation in hibernate stackoverflow.comI just want to know if transitive relation(i don't know if it can be called so) can be persisted in hibernate using annotations. ie, i have 3 pojo classes namely A,B and ... |
77. Exception while many-to-one relation org.hibernate.MappingException: Could not determine type for stackoverflow.comi want to write a simple many-to-one ORM using hibernate. I have tow tables, user and location. Location contains country names one of which i want to refer in user class. |
78. Hibernate - delete child in one-to-many relation throws ObjectDeletedException stackoverflow.comPlease, sorry if i ask already asked, but i just don't understand why Hibernate throws exception mentioned in title. I'm beginner and probably don't understand state management idea behind Hibernate. I have ... |
79. Create a JPA many-to-many relation using an id instead of an object stackoverflow.comI have a large dataset which I am importing in bulk with rows looking like category_id_x is an integer from a fixed set of categories.
I want to ... |
80. Hibernate Enum relation mapping in database stackoverflow.comCurrently I have Enums let's say |
81. JPA manytoone relation delete operation stackoverflow.comI want to delete ExternalProcessed files has same ExternalProcessedFileInfo But this query fails.It is easy when Relation reverted to @onetomany and cascade on delete but ... |
82. hibernate many to many relations cascade stackoverflow.comNewbie to hibernate i have two tables A and B that have many to many relations defined by a table AB(A_ID and B_ID) with foreign key reference to A.A_ID and B.B_ID ... |
83. JPA - how to avoid the same entity reference when having multiple relations of the same type? stackoverflow.comMy app has Struts-based GUI and EJB3 + JPA based backend. Say I have entity class like below: |
84. help to identify relation between database entites (for hibernate mapping) stackoverflow.comI have a web app in which I use hibernate and deploy on tomcat using ant .I have created a hibernate.cfg.xml in source directory with all mapping values . My app has ... |
85. Sub-optimal queries over many-to-many relations with HQL stackoverflow.comI have two entities, Location and Industry, and a link-table between them. I've configured a many-to-many relationship, in both directions, between the two entities. In a search query, I'm trying to select ... |
86. avoid relation table in Hibernate's mapping one-to-many(or one-to-many) association into db tables stackoverflow.comI am new to Hibernate. I notice that in Hibernate, mapping the java classes into database tables often involve relation tables, even sometimes relation tables are not necessary(Like in a one-to-many ... |
87. Why do Hibernate docs recommend to use a join table for a one-to-many relation? stackoverflow.comI thought that the common way to model a one-to-many relation in a database is via a foreign key relationship (i.e. one customer with many orders -> order table gets a ... |
88. Hibernate create object in relation through factory stackoverflow.comI'm new to Hibernate and I'm trying to achieve the following: the class i'm working with is persistent and is stored in DB. It looks like this: |
89. Relation not found error with play and postgres (while table does exists) stackoverflow.comI have a table called ETL_TABLES which resides on the public schema. In my application.conf I have the following line: |
90. JPA Relation or Secondary Table stackoverflow.comHi I am reengineering one of my project with JPA which was initially on iBatis. |
91. What is Object/relational mapping(ORM) in relation to Hibernate and JDBC? stackoverflow.comCan someone explain, in layman terms, what is Object/relational mapping(ORM) in relation to Hibernate and JDBC? Diagrams would be especially helpful for understanding... EDIT: I found this via google for Hibernate ORM, ... |
92. How to map a dynamic relation in JPA stackoverflow.comI have an Entity for holding Selection Domains, e.g. for Dropdown Boxes: |
93. Hibernate 3.6.7: Problem with @ANY and Foreign-Key stackoverflow.comI have the entities "User" and "Customer": |
94. hibernate OneToOne relation with compound key stackoverflow.com
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95. How to set values treated as NULL in JPA relations stackoverflow.comI have an Entity "A" with a one-to-many relation (1:n) to another Entity "B". Unfortunately, the (for years existing) database defines the column in B for the primary key of A ... |
96. Criteria query ManyToMany relation wint Restritions.in stackoverflow.comTable A --(joinTable)-- Table B So, there's many-to-many relation. |
97. HQL with Null check for one-to-one relation stackoverflow.comI have the following one-to-one relation in Hibernate (that could be null): |
98. Query M:N relationship with GORM for entity instances _not_ in relation to each other? stackoverflow.comI need to track a M:N relationship with attributes, so I'm using a link table (following the pattern at Many-to-Many Mapping without Hibernate XML) ... |
99. setting the correct jpa mapping for shopping cart items and product stackoverflow.comI am learning jpa through some examples ,involving a shopping cart and cart items.I defined them as below..but am not very sure about which mapping to use |
100. Optional one-to-one relation in hibernate stackoverflow.comI have been trying to find some information on how to implement a optional one-to-one constraint in hibernate. Apperently hibernate doesn't support @OneToOne(optional=true) from JPO, so how am I supposed to ... |
