Hi everybody, I am making a project for Group Chat which has following domain objects. What I want is that the orderId of CommentPK get auto incremented with respect to the groupId provided. If I use method like GenerationType.Table, pkColumnName="max_id_name", pkColumnValue="max_comment_id", valueColumnName="max_id" then the orderId will be globally unique which will also limit the maximum number of comments the system supports ... |
Hello My problem is how to configure a many-to-many relation between 2 tables with an associative table with composite keys. Here's my Database schema (simplified) Code: AREA , DOC and ROLE are tables with an ID and a VALUE (ie ID_AREA and VALUE_AREA for example) the Table ROLE_NAME have for PK the 3 PK of the previous tables ID_AREA ID_DOC ... |
I have a Table A , Table AB , TABLE B , Table AB has foreign key references to Table A and Table B. There is a One to One relation between Table A and Table AB.and Many to one between Table B and Table AB. My question is if i am saving domain for table B, it is saving data ... |
Hi, I'm having trouble getting Hibernate to process my mappings. I have a 2-table schema with a CUSTOMER_ACCOUNTS table keyed on a composite PK (Acount_Number, Site_ID). This is referenced by a CUSTOMER_TELEPHONES table, using the . The DDL is appended to the end of this email. My Customer mapping file looks like this: |
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My company is converting our application to java, so we are working with an existing database. I have used middlegen to generate the hbm.xml files and hbm2java to generate the java files. I am trying to run a simple query but keep getting a MappingException. I noticed other posts where the poster had a similar issue but none of those posts ... |
Say I have class C, which is a children class of class P, and the class P contains a composite key, persisted as class compID, where the identifier of compID is a identity key. I have a problem the foreign key of C references P is also composite. I have to first instantiate compID, and assign it to P. After that, ... |
Hi all, We are using Hibernate 2.1 with Oracle 9i. The ERD is virtually customer driven so we have little influence on legacy and third party design. That said, Hibernate has proven to be very flexible. We are encountering the following problem though (contrived example): We have the following two reference objects: PTA (account) and Organization: |
Author Message jalchin Post subject: one-to-one with composite keys Posted: Tue Mar 23, 2004 10:24 am Newbie Joined: Mon Mar 08, 2004 2:24 pm Posts: 13 Location: Tampa, FL, USA Does any one know of any issues with one-to-one relationships using composite keys? I have 2 objects (Case and Applicant) using the same composite key object (DocketNumberKey). I am ... |
I have a feeling I'm doing something very wrong, this simple query fails to parse: Code: select b2 from Benefit b1, Benefit b2 where b1.benefitType.code = 'H001' and b2 = b1 The error message is "path expression ends in a composite ... |
Okay, I've been reading the documentation / forums for two days now and still have not been able to figure out my problem. I wish to map two objects in a one-to-one relationship. Both objects have composite-id's. I am looking for a simpler explanation, or maybe a pointer to some sample code that I can look at. ANY help would be ... |
I, i'm using hibernate version 2.1.4, I am currently migrating to hibernate. I'm very intersted in using UID generation feature of hibernate for generating a part of a primary key.( Code: mapping element). But the mapping where i need such a feature contains a composite key. Here is the mapping: Code: |
Hi, I have a class PnPrscp300 that has two columns for the primary key. A mpiKey and a version number. The version column is a timestamp that is used in order to keep a history of the data. I am trying to do a lookup for a given mpiKey and the latest version number. ie. WHERE VERSION IN (SELECT MAX(VERSION) FROM ... |
We can't change bad legacy db design but must implement modification of composite keys. Personally I am not working on this segment, but we cannot make it run (screams "key changed" when updated). Is there something bad in the mapping? This class and table are only many-to-many substitution and because of additional parameters we need to have that class and access ... |
I have 2 tables A and B both with a composite primary key consisting of 2 columns, My question is how would a .hbm.xml file look like for specifying a third table which has a primary key consisting of 3 columns, column 1,2 are a foreign key to table A and column 2 and 3 are a foreign key to table ... |
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Hi, I'm having some trouble descring a relatively simple one-to-many association in the hbm mapping file. I'm trying to use, following Hibernate in Action's example, the tag. The tag wants a tag with the key column and a tag in my case. But what if the destination table has a composite key column and I need all ... |
I am reading hibernate documents now. I read something about the composite id "You may use a component as an identifier of an entity class. Your component class must satisfy certain requirements: It must implement java.io.Serializable. It must re-implement equals() and hashCode(), consistently with the database's notion of composite key equality. You can't use an IdentifierGenerator to generate composite keys. Instead ... |
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Hello, I'm new with Hibernate. Thats why I have the following question: Is it realy neccessary to have a key-class for an composit-key. If I don't take one, I get an Exception: Composite key has to be serializable. But my composite-key contains two Long and one String. That should be serializable. What am I wrong? Mapping and Class are appended. Thanks. ... |
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Newbie Joined: Mon Jun 20, 2005 11:07 am Posts: 16 Hi everyone I just have a no-sleep nite because of composite-key relationships in hibernate. I have this relationship working fine, that is basically a PurchaseTicket(NotaCompra) and a BuyingItem(ItemCompra), with a Product(Produto). The PurchaseTicket has a one-to-many with the BuyingItem, where the PT has all the priviledges to persist their BuyingItem Objects. ... |
Newbie Joined: Wed Jun 29, 2005 12:49 pm Posts: 4 In short: Is it possible to have the two columns of an relationship be a composite key? More detailed: When I was looking through the test code, I found this nice little example of how to use a formula and a one-to-one: Code: ... ... |
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Hibernate 3.x and Tools 3.x alpha 5 Table: Group, PK=groupId (an int) Table: Member, PK=memberId (an int) Table: GroupMember, Pk=groupId, memberId Class Generated: GroupMember with GroupMemberId get/setId(). Also generated: GroupMember.setGroup(...); GroupMember.setMember(...); Per the XML mapping file, GroupMemberId is mapped correctly. However, even if one was to use GroupMember.setGroup(g) and GroupMember.setMember(m), GroupMember.groupMemberId field would still not have been initialized with the groupId ... |
Hibernate version:3 I have un problem with composites key's Is composite work properly , My Model: article, categorie, art_cat art_cat is a link table article =====art_cat=======categorie When i load 1 article + set 1 or more art_cat no pb If i create a new "article", create 1 new art_cat hibernate send insert into art_cat (art_id, cat_id) values (NULL, 1) there no ... |
I am having three tables one is jobs which is having primary key is jobid. second is place table. the primary key of this table is placeid. the third table is jobplace. This table contain only two columns jobid and placeid. i created composite key . but i am unable to insert into the third table. Place table is the data ... |
Hi. We are having trouble mapping a one-to-many relationships with both ends' identity being composite keys (components). When trying to load it, we get Hibernate version: 3.1 Mapping documents: |
Hi, This is Jagadish. I have a composite key of 3 columns in mysql database table. I am connecting to the database through hibernate. I am trying to update a row in the table after modifying one of the column in the composite key. But i am getting the following exception "Could not synchronize database state with session". Can anyone help ... |
Hi, This is Jagadish. I have a composite key of 3 columns in mysql database table. I am connecting to the database through hibernate. I am trying to update a row in the table after modifying one of the column in the composite key. But i am getting the following exception "Could not synchronize database state with session". Can anyone help ... |
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Hi, We are using hibernate during the design of our project. As the current database model stands, it appears that if natural keys are used as primary keys it would make querying easier.In addition we plan to denormalise some data as we wish to avoid complex joins and reduce time execution of the query. The problem is we need to make ... |
Hi, We are using hibernate during the design of our project. As the current database model stands, it appears that if natural keys are used as primary keys it would make querying easier.In addition we plan to denormalise some data as we wish to avoid complex joins and reduce time execution of the query. The problem is we need to make ... |
Hi to all, I'm a totally newbie to Hibernate and I have a problem! I'm trying to use this mapping: |
Hi alll We are facing a problem with composite key and one to many assiciations. We have a 2 tables Person and Person_Contacts. Between person and person_contacts there is a one-to-many association. Person_contact table has a composite key made of PersonId and ContactMethod. We have done the following mapping in our Person.hbm.xml ... |
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Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate version: 3.05 Mapping documents: .. .. Code ... |
[code] @Entity class Sample { @EmbeddedId Key id; } [/code] [code] @Embeddable class Key { someProperty; otherProperty; } [/code] Everything works fine when I do: [code] select count(*) from Sample s [/code] But problems arise with a query like: [code] select count(s) from Sample s [/code] In this latter example, since Sample has a composite key, the generated sql looks like: ... |
A bit confused about mapping a table. I want the table to look like this: table JobFile column waittime column transfertime column transferSpeed column Job references table Job column File (String representing full path to file) primary key(job,file) ---------------------- Code: |
I have two table.. One is header anbd it has two keys which is a composite key and a detail table which has the header compsite key and also the primary key for the child. the composite key needs to be generated automatically without any class. On saving the header, the header and the detail value needs to be stored. Please ... |
Hi All, I have One to Many Association betweeb UserPreferences and UserColumns Tables. PerefrenceId is the primary key of the UserPreferences. And i am using sequence for it. PrefrenceId is the foriegn key used for assocoation. But this PerefrenceId is also shared by the composite key in the UserColumns. When i have to save the UserPrefrerence like below: UserPreferences userPrefrences=new UserPreferences(); ... |
I just cant seem to come up with a valid mapping. Code: ... |
Hi, Both the manual and Hibernate in Action discourages use of composite keys but I'm stuck with a legacy schema that looks simplified like a classic Order: primary key (customer, ordernumber) and OrderRow: primary key (customer, ordernumber, rownumber) and I've mapped them OK as a bidirectional one-to-many, implemented hashCode and equals() etc. The order rows are mapped to a List. The ... |
Beginner Joined: Thu Dec 08, 2005 12:18 pm Posts: 21 Location: Birmingham, Alabama I am hoping someone can guide me through this issue. I have solved this problem earlier using JPA, but I now must use Hibernate only. This is the annotation I used in JPA. Code: @ManyToMany(cascade={CascadeType.ALL}) @JoinTable(name="DOCUMENT_COLLECTION", ... |
Hi All, I am new to Hiberante. I am not very clear on how to configure a table with a composite key. I am using apache derby. But this is a very basic question. I read the documentation and worked on it. I am still not there . I see a "Could not parse mapping document from resource xyz.hbm.xml." My question ... |
Hi All, I am facing problem with compound key implementation. Please solve my problem. I have 3 tables Table Columns Student: studentID, ..... Class : classID,.... Names: studentID,classID,.... Now My problem is In names table I doesnt have any primary key and having only foreign keys. Now I have to create an composite key using these foreign key values. It would ... |
Assuming that you have a class Link/LinkId and a class Figure/FigureId...probably something like: Code: @Embeddable public class FigureId implements java.io.Serializable { private Integer figureId; private String gender; @Column(name="figure_id"...) public Integer getFigureId() ... |
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Hi, I am trying to create a simple namedQuery where the qualifier is a part of a composite key using JPA. Here's how I defined the primary key class (composite key): public class LocationGroupKey implements Serializable { public long childLocationId; public long parentLocationId; public LocationGroupKey() { } //... the rest of the code omitted for brevity. Here's how I defined the ... |
have you tried some thing like this:- Code: ... |
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Hello, I was wondering how you would write the mapping file for a one-to-many with a copmosite key. I have the following mapping file... |
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