CODEWITHSUNDEEP
hibernatehibernate-mapping
Ramesh Kotha
Ramesh Kotha

Reputation: 8322

Many to many hibernate mapping with extra columns?

Hi i have many to many mapping with extra columns in the join table. table structure look like this.

table vendor{vendor_id, vendor_name, vendor_password, etc...}
table student{student_id, student_name, student_password, etc..}
table test{test_id, test_subject, test_price,test_level, etc..}

Relations as follows

vendor to test --> many-to-many
student to test --> many-to-many

link 

table vendor_student_test{vendor_id, student_id, test_id, purchasedDate, assignedDate, writtenDate, result}

i created POJO classes as follows

  1. Vendor.java
public class Vendor {
Long vendorId;
Set<VendorStudentTest> tests;
//set and get
}
  1. Student.java
public class Student{
Long studentId;
Set<VendorStudentTest> tests;
//set and get
}
  1. Test.java
public class Test{
Long test_id;
double test_price;
//set and get and remaining fields
}
  1. VendorStudentTest.java
public class VendorStudentTest{
public VendorStudentTestPK vendorStudentTestPK;
Date purchasedDate;
Date assignDate;
Date writtenDate;
double result;
//set and get accordingly
}
  1. VendorStudentTestPK.java
public class VendorStudentTestPK{
Long vendor_id;
Long student_id;
Long test_id;
}

Hibernate mapping files as follows

vendor.hbm.xml

<set name="tests" table="vendor_student_test"
                inverse="true" lazy="true" fetch="select">
            <key>
                <column name="vendor_id" not-null="true" />
            </key>
            <one-to-many class="VendorStudentTest" />
        </set>

vendor_student_test.hbm.xml

    <composite-id name="vendorStudentTestPK"
        class="com.onlineexam.model.VendorStudentTestPK">

        <key-property name="vendor" column="vendor_id"
            type="java.lang.Long" />
        <key-property name="student" column="student_id"
            type="java.lang.Long" />
        <key-property name="test" column="test_id" type="java.lang.Long" />

    </composite-id>

student.hbm.xml

<set name="tests" table="vendor_student_test"
                inverse="true" lazy="true" fetch="select">
            <key>
                <column name="student_id" not-null="true" />
            </key>
            <one-to-many class="VendorStudentTest" />
        </set>

test.hbm.xml

//this is mapped to other table

I am new to hibernate, Is this correct mapping?

Upvotes: 2

Views: 10943

Answers (1)

danny.lesnik
danny.lesnik

Reputation: 18639

solution with Annotation Case can be found here

How Do I Create Many to Many Hibernate Mapping for Additional Property from the Join Table?

Solution using xml file can be found here: Mapping same class relation

and here:

Mapping same class relation - continuation

Upvotes: 1

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