hibernate annotations with composite primary key

Ads

Share on Google+

suresh anugandula

hibernate annotations with composite primary key
1 Answer(s) 6 years and 5 months ago
Posted in : Hibernate

I want to know how to use hibernate annotations in case of composite primary key in one table. I tried like this, I have created a table without primary key. By default mssql has created a composite primary key with all the columns of the table.

table: create table student(sid number(5),sname varchar2(20),age number(3));

And i have created 2 pojo classes like this,

Student.java:

@Entity @Table(name="student_tbl") @IdClass(StudentID.class) public class Student implements Serializable{ /** * */ private static final long serialVersionUID = -7007299156855950071L; private StudentID id;
```
public StudentID getId() {
    return id;
}


public void setId(StudentID id) {
    this.id = id;
}
```
}
- StudentID.java
import javax.persistence.Column; import javax.persistence.Embeddable; import javax.persistence.OneToMany; @Embeddable public class StudentID {
```
long sid;
String name;
double age;
@OneToMany
public long getSid() {
    return sid;
}
public void setSid(long sid) {
    this.sid = sid;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public double getAge() {
    return age;
}
public void setAge(double age) {
    this.age = age;
}
```
}

And i have created a Store.java to store a record inside the mssql database.
- Store.java
import org.hibernate.Session; import org.hibernate.Transaction;

public class Store { public static void main(String[] args) { Session session=HibernateSessionFactory.getSession(); Transaction tx=session.beginTransaction(); Student studentObject=new Student(); StudentID studentIDObject=new StudentID(); studentIDObject.setSid(123456l); studentIDObject.setName("suresh"); studentIDObject.setAge(24d); studentObject.setId(studentIDObject); session.save(studentObject); tx.commit(); session.close(); } }

When i ran the above java file, i got following exception,

%%%% Error Creating SessionFactory %%%% org.hibernate.AnnotationException: No identifier specified for entity: com.tbss.Student at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) at com.tbss.HibernateSessionFactory.(HibernateSessionFactory.java:32) at com.tbss.Store.main(Store.java:8) %%%% Error Creating SessionFactory %%%% org.hibernate.AnnotationException: No identifier specified for entity: com.tbss.Student at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:672) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1333) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) at com.tbss.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:71) at com.tbss.HibernateSessionFactory.getSession(HibernateSessionFactory.java:54) at com.tbss.Store.main(Store.java:8) Exception in thread "main" java.lang.NullPointerException at com.tbss.Store.main(Store.java:9)

Please help me in resolving this problem. And please send the answer to following mail id

Ads

View Answers

June 17, 2011 at 3:17 PM

Please go through the following link:

Hibernate Notations

Ads

Advertisements

Create primary key using hibernate
Create primary key using hibernate How to create primary key using hibernate? The id element describes the primary key for the persistent class and how the key value is generated. <id name="id

How to create primary key using hibernate?
How to create primary key using hibernate? Hi, How to create primary key using hibernate? Thanks

Define sequence generated primary key in hibernate
Define sequence generated primary key in hibernate How to define sequence generated primary key in hibernate? Use value "sequence" for class attribute for generator tag. <id column="USER_ID" name="id" type

can we update table in hibernate with out primary key in table?
can we update table in hibernate with out primary key in table? can we update table in hibernate with out primary key in table

primary key and unique key
primary key and unique key Whats is mean by primary key and unique key

primary key and unique key
primary key and unique key hello, What's the difference between a primary key and a unique key? hii, Unique key: column restricts entry of duplicate values but entry of null values is allowed. Primary key

Define candidate key, alternate key, composite key.
Define candidate key, alternate key, composite key. Define candidate key, alternate key, composite key

What is a "primary key"?
as a primary key, they are called a composite key. Thanks...What is a "primary key"? What is a "primary key"? Hi, Here is the answer, A primary key is used to uniquely identify each row

HIBERNATE COMPOSITE ID - Hibernate
HIBERNATE COMPOSITE ID Hi, I have a database table structure... default NULL, `timeOut` time default NULL, PRIMARY KEY (`sno`), KEY `FK_attendance` (`empRef`), CONSTRAINT `FK_attendance` FOREIGN KEY (`empRef

difference between a primary key and a unique key?
difference between a primary key and a unique key? What's the difference between a primary key and a unique key? Hi, The column holding the primary key constraint cannot accept null values.whereas column holding

Adding A Primary Key to an Existing Table
Adding A Primary Key to an Existing Table Been trying to add a primary key to a MySQL table using Java for two days with no success. I'm new... KEY (SerialNo)"); out.println("Primary key added

SQL Alter Table Primary Key
SQL Alter Table Primary Key Alter a Table Primary Key in SQL modifies the existing table and adds a primary key. Create Table Stu_Table SQL statement to create

SQL PRIMARY KEY Constraint
SQL PRIMARY KEY Constraint The PRIMARY KEY constraint is used to uniquely identifies each... values. It should contain NULL values. The Table contain a primary key

changing primary key of parent table
changing primary key of parent table I want to change one primary key from a table where primary key is auto created? How can I do that? I have tried UPDATE person SET personid=3494 WHERE personid=8483; and i get the following

JDBC insert that returns primary key
JDBC insert that returns primary key How to write code for jdbc insert that returns primary key? Help me fast Thanks Hi, Following code can be used: //Add record into database String queryInsert = "insert

Mysql add primary key
Mysql add primary key Mysql add Primary Key is used to add primary key on the column... of this tutorial illustrate an example from 'Mysql Add Primary Key'. To understand

SQL Primary Key
SQL Primary Key The Primary Key in SQL is used to uniquely identifies each records in a database table. The Primary Key of the Table does not include NULL values

Difference between not null and primary key in mysql
Difference between not null and primary key in mysql Explain not null and primary key in mysql

Mysql Alter Table Primary Key
Mysql Alter Table Primary Key Mysql Alter Table Primary Key is used to remove the primary key from the table and add primary key to the existing other column of table

Automatic primary Generation in Hibernate - Hibernate
Automatic primary Generation in Hibernate Hi, Ow primary key is generated automatically in hibernate.give me sample code.Thank u

SQL PRIMARY KEY Constraint
SQL PRIMARY KEY Constraint The PRIMARY KEY constraint is used to uniquely... a unique values. It should contain NULL values. The Table contain a primary key

how tohow to create a table with primary key and foreign keyhow to create a table with primary key and foreign key
how tohow to create a table with primary key and foreign keyhow to create a table with primary key and foreign key how to create a table using java language with primary key and foreign key Hi Friend, A foreign

Mysql Alter Column Primary Key
Mysql Alter Column Primary Key Mysql Alter Column Primary Key is used to modify table and redefine the Primary Key Column in a table. Understand with Example

How to auto increment primary key in mysql...
How to auto increment primary key in mysql... How to auto increment primary key in mysql... and one more thing i need to get auto increment value in front end each time for inserting the value[JSP

Hibernate Annotations ManytoMany - Hibernate
Hibernate Annotations ManytoMany Can anybody tell me how to have a many to many relationship through Hibernate Annotations not through the Hbm.xml files plz

In Composite Key Insertion Operation why the POJO class should implement Seriliazalbe interface?
In Composite Key Insertion Operation why the POJO class should implement Seriliazalbe interface? In normal primary key insertion operation pojo... of Composite Key Insertion Operation why the POJO class should implement Seriliazalbe

hibernate annotations
hibernate annotations I am facing following problem, I have created 2 tables (student and address) with foreign key in address table. I am using hibernate annotations to insert records into these tables. But it is trying

query regarding auto increment primary key
query regarding auto increment primary key i want to use s1,s2.... as my auto increment primary key.cant i do this in mysql

SQL Alter Table Primary Key tutorial
SQL Alter Table Primary Key Alter a Table Primary Key in SQL modifies the existing table and adds a primary key. Create Table Stu_Table SQL statement to create

Ads

Advertisement null

Ads