Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Hibernate Hibernate4 Hibernate Outer Join

Related Tutorials


 
 

Share on Google+Share on Google+

Hibernate Outer Join

Advertisement
In this section, you will learn about types of outer joins in Hibernate.

Hibernate Outer Join

In this section, you will learn about types of outer joins in Hibernate.

What is Join in SQL?

A SQL join combines the matching records from the two database tables. The matching record is on the basis of some condition, which we will provide with the query. The simple SQL query is given below : (not for Hibernate)

SELECT Student.LastName, Student.FirstName, Enrollment.EnrollNo
FROM Student
INNER JOIN Enrollment
ON Student.EnrollNo=Enrollment.EnrollNo
ORDER BY Student.LastName

Join is of three types :

  • Inner Join
    Inner Join returns the matching row/rows between the two tables. In Hibernate, the keyword is inner join. The complete query is given below : 
    select e.firstname,e.lastname,e.cellphone,a.city,a.state,a.country from Employee e
    inner join e.address as a
  • Left Outer Join
    Left Outer Join returns all the records from the left table and only matching records from the right table. In Hibernate, the keyword is left join. The complete query is given below : 
    select e.firstname,e.lastname,e.cellphone,a.city,a.state,a.country from Employee e
    left join e.address as a

  • Right Outer Join
    The Right Outer Join returns all the records from right table and only matching records from the left table. In Hibernate, the keyword is right join. The complete query is given below :
    select e.firstname,e.lastname,e.cellphone,a.city,a.state,a.country from Employee e
    right join e.address as a
  • Full Join
    Full Join returns matching  records from both the table plus all the remaining records from both  the table. The full join is not usually useful.

For complete tutorial on the Outer Join please go through the below links :

Advertisements

If you enjoyed this post then why not add us on Google+? Add us to your Circles



Liked it!  Share this Tutorial


Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.

Posted on: April 13, 2012

Related Tutorials

Discuss: Hibernate Outer Join  

Post your Comment


Your Name (*) :
Your Email :
Subject (*):
Your Comment (*):
  Reload Image
 
 
Comments:0
DMCA.com