Assigned Algorithm

This algorithm is default primary key generation algorithm in hibernate applications, it will not required configurations in mapping file.
This algorithm will not have its own mechanism to generate primary key value , it will request to Client Application to provide primary key value explicitly.
This algorithm is able to support for any type of primary key values like short, int, long, String, etc.
This algorithm is supported by almost all the databases like Oracle, MySQL, DB2, etc.
This algorithm is not required any input parameter.
This algorithm is represented by Hibernate in the form of a predefined class “org.hibernate.id.Assigned”.

E.g

<?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
	<class name="com.ashok.hibernate.sample.model.Employee" table="emp">
		<id name="id" type="int" column="id">
			<generator class="assigned" />
		</id>
		<property name="empName" column="emp_name" type="string" />
		<property name="address" column="address" type="string" />
		<property name="salary" column="salary" type="double" />
	</class>
</hibernate-mapping>

Assigned Algorithm