How to create primary key using hibernate?

Showing Answers 1 - 7 of 7 Answers

siddharth

  • Oct 25th, 2006
 

In your hbm.xml file use field.this field create a primary key for u .

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Sachin Yadav

  • Feb 10th, 2007
 

id field in hbm.xml file is used to specify the primary key in database. We also use generator to specify the way primary key is generated to the database. For example
< id name="testId" type="string" >
< column name="testColumn" length="40" / >
< generator class="increment" / >
< /id >
here the primary key field name in datbase is testColumn and it will autonmatically incremented by one as the generator is specified as increment.

Sony v George

  • Apr 5th, 2007
 

In .hbm file there is a tag called id, there we mention the primary key.

<hibernate-mapping>
 <class name="pojo1" table="pojo1" discriminator-value="s">
 <id name="empid" type="string" >
  <generator class="assigned"/>
</hibernate-mapping>

Here Id ="empid", that will act as primary key of the table "pojo1"

sarikapj

  • Dec 28th, 2007
 

We can also specify primary key using annotations in the POJO using:

@javax.persistence.Id before the appropriate field in POJO with @Column

@Id
@Column(name="user_id")

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chanmaha25

  • Jul 29th, 2008
 

Ccreate primary key? Not sure but you can defined it in the hbm file by specifying the field with the primary column in the db.

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First you have to do is when you are creating table itself you have to give the primary key for any one of the column and then in the hibernate take hbm file  in that there is a tag like <id> in that tag u have to give the name of the column in table which is considered as primary key and also give the name of the property in pojo class which is considered as primary key.So the name of the property which is placed in <id> is considered as primary key by hibernate.

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vimala

  • Jul 13th, 2012
 

In hibernate mapping file

Code
  1. .hbm.xml add <id> under <class>

  2. <class name="class name" table="table name">

  3.    <id name="pojo variable name" column="table column name"/>//primarykey mapping

  4.    <property name="pojo variable name" column="table column name/>//non-primarykey mapping

  5. </class>



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