Hibernate uses mapping metadata to find out how to load and store objects of the persistent class. The Hibernate mapping could be specified using configuration files or annotations.
1
vote
1answer
30 views
Unable to make 'many-to-many' relation between Person and Address class
How do I make many-to-many relation between 2 classes Person and Address ? Following is the POJO for Person and Address respectively.
Person :
public class Person {
private int personID;
...
0
votes
1answer
39 views
Why am I getting org.hibernate.id.IdentifierGenerationException?
As I run my main class (Runner) program I get the following exception :
org.hibernate.id.IdentifierGenerationException: attempted to assign id
from null one-to-one property: country
I don't know ...
0
votes
2answers
52 views
The concept for one-to-one mapping. Explain the mapping
How to define a One-to-One relation between 2 classes ? I think I am going wrong somewhere,conceptually. I don't know what ,but it is.
Let us suppose there are two classes named Country and PM :
...
1
vote
2answers
41 views
Unable to make 'one-to-one' relationship between the two classes
What shall I do in the following xml to make a one-to-one relationship between Country class and PM class ?
<class name="pojo.Country" table="country">
<id name="c_id">
...
2
votes
1answer
34 views
What shall I mention for the 'name' attribute ? Why this validation error?
I am trying to make a one-to-one relation between Country class and PM class.This is the xml mapping I tried to
make.But there is something wrong with the xml as the error says.
Attribute "name" is ...
1
vote
1answer
32 views
What does the 'sort' attribute do?
Following is the snippet from the hibernate mapping file, of the class named m1.
<class name="pojo.m1" table="m1">
<id name="r_no">
<generator class="increment" />
...
0
votes
0answers
16 views
How do I setup Hibernate reverse engineering to generate update and insert properties in the generated hbm.xml mapping files
I am using Hibernate 4.1 to reverse engineer (using hibernate.revenge.xml) to generate both my mapping files (*.hbm.xml) and my pojo's from an MS-SQL database.
Some of the tables contain calculated ...
1
vote
1answer
20 views
hibernate non-unique one to one mapping
we are working with a legacy database and I'm wondering if our set up is at all possible with Hibernate the way it is:
We have two tables Entity and EntityDef
CREATE TABLE entity
(
id DOUBLE,
...
0
votes
1answer
17 views
Hibernate 3 Annotation Mapping Issue
I am new to Hiberante 3. I am facing issues when I am trying to map 3 tables which has the below relations.
ITEM_MASTER (Table):
ITEM_ID-PK
LOCATION_ID
ITEM_MASTER_ATTR (Table):
ITEM_ID - FK
...
1
vote
2answers
62 views
After changing JDBC to hibernate the application runs very slow
Previously I used JDBC in my application and it was running very fast, but I have modified it to use Hibernate which made it too slow, especially when it needs to open a page that has a dropdown box ...
0
votes
0answers
10 views
Hibernate not fetching Join result
I have two tables represented as following in Hibernate.
Class A
{
@Id
@Column(name = "a_id")
private Long a_id;
}
Class B
{
private Long a_id;
private A objA;
@ForeignKey ...
0
votes
1answer
31 views
Problems mapping entities of single_table inheritance
I use hibernate 4. I use single_table inheriatnce strategy for entities JuniorUser extended by ExpertUser. It is mapped in Answer entity with type JuniorUser like:
@NotNull
@ManyToOne(fetch = ...
0
votes
1answer
21 views
How to get datasource from Hibernate Configuration
I would like to get a datasource from a hibernate Configuration programmaticaly. Here is the code that I wrote :
public static DataSource getDatasource(Configuration configuration){
...
0
votes
1answer
16 views
Hibernate Criteria query by Example mapping
There is only one Envelope object and 2 Invoice object which are mapped by this Envelope.When I try to query with following code, it returns 2 Envelope object which are same. I think there is a ...
0
votes
0answers
35 views
Spring Template Project jpa annotations
I have a one to many relationship: Order and Items. An Order may have lots of items
The code below (all code) is auto generated by Spring Template project:
On the Order Side:
...
1
vote
2answers
22 views
Hibernate Restricitions.ilike runs into error
Executing the following restrictions runs into following error
Message: java.lang.String cannot be cast to java.lang.Integer
if (suburbid > 0) {
...
0
votes
1answer
36 views
Performing a Hibernate Join on two tables with a One to Many Association
I basically have a database with two tables in it with the following schema:
Employee
|id|Age|Sex|
Table
|Table_id|Emp_id|Location|
My employee.hbm.xml file looks like:
<property ...
1
vote
1answer
90 views
+100
Hibernate lazy loading for reverse one to one workaround - how does this work?
I was having problems today with lazy loading not working when using a mapped by collection. I found this excellent article that seems to fix the problem
...
0
votes
0answers
34 views
Hibernate mapped by hitting database
I have a one to one relationship in hibernate between Man and Car (excuse the simplistic example)
In Man I have
@JoinColumn(name = "CAR_ID", referencedColumnName = "id")
@OneToOne(cascade = ...
0
votes
1answer
59 views
getting org.hibernate.InvalidMappingException: Unable to read XML
I am using NetbeansIDE 7.2. and pgAdmin III PostgreSQL 9.2 with Database name "StudentReports".
I know a little of Hibernate and generating JasperReports using native SQL through JDBC Connection. But ...
0
votes
0answers
8 views
hibernate criteria query with multiple mapping
I have to modify a hibernate criteria query. The mapping is:-
ClassA n:m ClassB 1:1 ClassC.
Here I have to find a list of ClassA instances in the DB which have the exact set of ClassC instances ...
0
votes
0answers
19 views
Cannot fetch data from database using spring and hibernate
i am developing a spring and hibernate application and got into a problem. i have a many to many related entity's with join table which are:
@Entity
public class Invoice implements ...
3
votes
1answer
112 views
How to avoid updating unchanged fields?
I need to configure my hibernate to avoid updating those fields that has not been changed.
So I have added the following annotation to my class but it crossed the Entity, and dynamicUpdate.
...
1
vote
0answers
36 views
I do not understand this mapping file.What does many-to-many tag here do?
I have a problem understanding the following hibernate mapping xml.
<class name="pojo.NewClass" table="emp_master">
<id name="emp_code">
<generator class="increment" ...
1
vote
1answer
60 views
what type of mapping is this?
With the hibernate mapping file as shown :
<hibernate-mapping>
<class name="pojo.Ghazal" table="ghazal">
<id name="s_no">
<generator class="increment" ...
2
votes
1answer
40 views
Hibernate and MS SQL Server Identity column
I'm new to Hibernate and am unable to use an Identity column. When I run my java program using identity as generator, it gives the error that it "...cannot insert default or null value" in the ...
0
votes
1answer
28 views
How to set fetch=“Join” and lazy=“False” in <key-many-to-one > mapping in hbm.xml
I have table mapping in .hbm.xml file as follows. when i set lazy loading to false , it is not working. It is fire lots of select query to db to load other table.
<class name="GroupConfigDO" ...
0
votes
1answer
19 views
How to insert using hibernate 4.1.10.Final?
I am using hibernate 4.1.10.Final to insert data into database, but it throws the following exception,
I have three tables, development and address .
Development has an object of address in itself.
...
0
votes
2answers
78 views
how to implement auto increment id field per table with Hibernate and postgresql for one to many relationships
I have 4 entities one-to-many Message entity:
@Entity
@Table(name = "Messages")
public class Message {
...
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "messagesounds_id")
...
1
vote
1answer
29 views
How to load only ids from Many to Many mapping tables?
In a Many to Many relation between two table with a Mapping table in between, how can I only load ids for the second entity.
Following is the example to explain what I want to achieve here.
Below is ...
