Wednesday, July 19, 2017

Hibernate MappedBy Example (like @OneToOne, @OneToMany, @ManyToMany)

Using "mappedBy" attribute of mapping annotations(like @OneToOne, @OneToMany, @ManyToMany) for bi-directional relationship. This attribute allows you to refer the associated entities from both sides. If "X" has association with "Y" then you can get X from Y and Y from X.



You can download source code from Github MappedByExample

1) OneToOne

    Book and Author
 
            Author
        id, email, name, phone
        1, author@gmail.com, name, 543653465

        Book
        id, content, title, author_id
        1, re  td e sdf asdfasdfasd f, java, 1


2) OneToMany

    Person and Phone
 
            Person
        id, firstName, lastName
        1, Saurabh, Chaudhari

        Phone
        id, network, number, person_id
        1, BSNL, 0987654321, 1
        2, Vodafone, 1234567890, 1

   
3) ManyToMany

    Employee and Department
 
            Employee
        id, firstName, lastName
        1, Saurabh, Chaudhari

        Department
        id, name
        1, QA
        2, Software Engineer
   
   
        Employee_Department
        employees_id, departments_id
        1, 1
        1, 2

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