Question

I am creating a table with two primary keys. The first one is id(Integer) and second one is email(varchar2(50)).
My mapping file contains

<hibernate-mapping package="suri.sahasra">
    <class name="Person" table="PERSONS">
        <composite-id name="pkField" class="PKField">
            <key-property name="personId" column="person_id"/>
            <key-property name="email" column="email"/>
        </composite-id>

        <property name="firstName" column="first_name"/>
        <property name="lastName" column="last_name"/>
        <property name="age" column="age"/>
    </class>
</hibernate-mapping>

Now I am trying to select data using load method, but it’s raising a typeMisMatch Exception.
My load function is:

Person p1=(Person) ss.load(Person.class,new Integer("1"));
System.out.println(p1.getFirstName());
System.out.println(p1.getLastName());
System.out.println(p1.getAge());

How do you retrieve data if the table contains two primary keys. Please help me.

Answer 1

you have to use

Person p1=(Person) ss.load(Person.class,new PKField("1","email"));

and PKField must implement .equals() and hashcode() methods,
hibernate relies on these methods to cache and compare the data.