Hibernate onetomany not updating

Transaction; import com.journaldev.hibernate.model. Hibernate Annotation Util; public class Hibernate One To Many Annotation Main Hibernate Annotation Configuration loaded Hibernate Annotation service Registry created Session created Hibernate: insert into CART (name, total) values (? ) Hibernate: insert into ITEMS (cart_id, item_id, item_total, quantity) values (? The term “bidirectional” literally means “functioning in two directions”, which is the concept that we will apply in our relationships between two Java objects. What you need to know is that since we have a bidirectional relationship, this means we need to assign objects to EACH side of the relationship. You now know how to create a One-to-Many bidirectional relationship with Hibernate. As always, if you want to be on the cutting edge of these Java tutorials and receive updates on when I’m putting on free webinars and doing give-aways please join my mailing list by putting in your email address in the popup below.When we have a bidirectional relationship between objects, it means that we are able to access Object A from Object B, and Object B from Object A. This means that we need to populate both the Note: To observe best coding practices, the code I’ve put into this Controller class is usually best placed in a Service class, but to keep things as simple as possible for this tutorial I’ve just placed all the code directly into the Controller. When you do you’ll instantly receive one free gift from me (and plenty more in the future). However, when you traverse from the “One” to the “Many” side, you will need to hold a reference to MANY objects. Many-to-One equals one reference, One-to-Many equals many references. We're giving away four copies of Java 9 Modularity: Patterns and Practices for Developing Maintainable Applications and have Sander Mak & Paul Bakker on-line! I read that it is good practice to maintain both sides of relationship. I could think of the below structure which may be correct or wrong? mysql describe user; ---------- -------------- ------ ----- --------- ---------------- | Field | Type | Null | Key | Default | Extra | ---------- -------------- ------ ----- --------- ---------------- | userid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | username | varchar(255) | YES | | NULL | | | password | varchar(255) | YES | | NULL | | | cellno | varchar(255) | YES | | NULL | | | dob | varchar(255) | YES | | NULL | | ---------- -------------- ------ ----- --------- ---------------- 6 rows in set (0.00 sec) mysql describe email; --------- -------------- ------ ----- --------- ------- | Field | Type | Null | Key | Default | Extra | --------- -------------- ------ ----- --------- ------- | email Id | varchar(255) | NO | PRI | NULL | | | user Id | int(11) | YES | MUL | NULL | | --------- -------------- ------ ----- --------- ------- 2 rows in set (0.01 sec) thanks Hello Monica! NAME AS name2_3_1_, onetooneca1_AS id1_4_0_, onetooneca1_.created_on AS created_2_4_0_, onetooneca1_.visible AS visible3_4_0_ FROM post onetooneca0_ LEFT OUTER JOIN postdetails onetooneca1_ ON onetooneca0_= onetooneca1_WHERE onetooneca0_= 1 UPDATE postdetails SET created_on = '2015-03-03 .874', visible = true WHERE id = 1 UPDATE post SET NAME = 'Hibernate Master Class Training Material' WHERE id = 1 SELECT onetooneca0_AS id1_3_0_, onetooneca0_.

Compare it with XML based configurations, you will find them very similar. Our test program is just like xml based configuration, we are just using the new classes for getting Hibernate Session and saving the model objects into database.

Below are the two tables: describe user; ---------- -------------- ------ ----- --------- ---------------- | Field | Type | Null | Key | Default | Extra | ---------- -------------- ------ ----- --------- ---------------- | userid | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | username | varchar(255) | YES | | NULL | | | password | varchar(255) | YES | | NULL | | | cellno | varchar(255) | YES | | NULL | | | dob | varchar(255) | YES | | NULL | | ---------- -------------- ------ ----- --------- ---------------- 6 rows in set (0.00 sec) mysql describe email; --------- -------------- ------ ----- --------- ------- | Field | Type | Null | Key | Default | Extra | --------- -------------- ------ ----- --------- ------- | email Id | varchar(255) | NO | PRI | NULL | | | user Id | int(11) | YES | MUL | NULL | | --------- -------------- ------ ----- --------- ------- 2 rows in set (0.01 sec) Register Dao dao=new Register Dao(); User user=new User(); Birth Date(birth Date); Cell No(cell No); User Name(user Name); Name(name); Password(password); Website(website); Email email1=new Email(); email1Email Id("[email protected]"); Email email2=new Email(); email2Email Id("[email protected]"); Hash Set select * from user; -------- ------ ---------- ---------- -------- ------ | userid | name | username | password | cellno | dob | -------- ------ ---------- ---------- -------- ------ | 1 | fsdf | sa | 1111111 | 1111 | 11 | -------- ------ ---------- ---------- -------- ------ 1 row in set (0.00 sec) mysql select * from email; --------------- -------- | email Id | user Id | --------------- -------- | [email protected]| NULL | | [email protected]| NULL | --------------- -------- 2 rows in set (0.00 sec) But now one issue is left that user Id in email table is coming null. It means if you delete Email instance from email Ids collection corresponding record from email table will be deleted. Or user Id entry is not required in Email table.there can be only 1 column in email table that is Email Id.

On trying to save User object (which has a set of email Ids) it gets saved in User table but not in email table. As probably record in email table does not have any sense without corresponding record in user table it is reasonable to set cascade =”all-delete-orphan”. So in that case should the Email table have only 1 entry that is Email Id and one for User Id?

We can apply this logic to our real world coding example that we saw in the last post. Many To One; @Entity public class Employee objects into the database in a unidirectional manner… now that we’ve changed our code around to use a bidirectional relationship, we need to change the way we persist our data. Repository; import org.springframework.transaction.annotation. Transactional; import com.howtoprogramwithjava.example.persistence. Employer; @Transactional @Repository public class Employer Dao Now the only missing piece is to show you how to actually persist data using this new bidirectional One-to-Many mapping.

The example we will use is the relationship between an object and not vice-versa. As I mentioned, we previously used the import org.hibernate. Session Factory; import org.springframework.beans.factory.annotation. I’ve set up the test code in a Controller class, I’ll include all of the code for the sake of completion, but all you really need to be concerned with is how the code inside the import Set; import org.springframework.beans.factory.annotation.

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Create a simple Maven project in Eclipse or you favorite IDE, the final project structure will look like below image. Service Registry; public class Hibernate Util element for cart and we are providing column name that will be mapped with the key.

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