Updating database examples java

This operation adds the entity object to persistent context and further changes are tracked and saved when transaction is committed. package com.journaldev.hibernate.main; import org.hibernate. Hibernate update should be used where we know that we are only updating the entity information. Let’s look at hibernate persist with a simple program. Finally, persist doesn’t return anything so we need to use the persisted object to get the generated identifier value. Transaction; import com.journaldev.hibernate.model. After committing save transaction ***** Hibernate persist is similar to save (with transaction) and it adds the entity object to the persistent context, so any further changes are tracked. Any further changes are saved at the time of committing transaction, like persist. Hibernate save Or Update adds the entity object to persistent context and track any further changes. Transaction; import com.journaldev.hibernate.model. After committing update transaction Hibernate: select employee0_.emp_id as emp_id1_1_0_, employee0_.emp_name as emp_name2_1_0_, employee0_.emp_salary as emp_sala3_1_0_, address1_.emp_id as emp_id1_0_1_, address1_.address_line1 as address_2_0_1_, address1_as city3_0_1_, address1_.zipcode as zipcode4_0_1_ from EMPLOYEE employee0_ left outer join ADDRESS address1_ on employee0_.emp_id=address1_.emp_id where employee0_.emp_id=? Id= 101, Name= Final updated name, Salary= 1000.0, 13. After committing update transaction Notice that there are no updates fired after first execution because there are no update in values. Also notice that in further execution, name is “Kumar”, this is because the returned object is tracked for any changes.

After committing save Or Update transaction ***** Notice that without transaction, only Employee gets saved and address information is lost. Hibernate Util; public class Hibernate Update Example Hibernate: select employee0_.emp_id as emp_id1_1_0_, employee0_.emp_name as emp_name2_1_0_, employee0_.emp_salary as emp_sala3_1_0_, address1_.emp_id as emp_id1_0_1_, address1_.address_line1 as address_2_0_1_, address1_as city3_0_1_, address1_.zipcode as zipcode4_0_1_ from EMPLOYEE employee0_ left outer join ADDRESS address1_ on employee0_.emp_id=address1_.emp_id where employee0_.emp_id=? ***** Notice that first employee object is inserted, then at the time of transaction commit, update query is executed to update the name value. Hibernate save Or Update results into insert or update queries based on the provided data. Id=166 Hibernate: insert into ADDRESS (address_line1, city, zipcode, emp_id) values (? After committing save Or Update transaction ***** 11. Id=166 Hibernate: update ADDRESS set address_line1=? Employee Details=Id= 20, Name= Kumar1, Salary= 1000.0, 5. Before committing save transaction Hibernate: update EMPLOYEE set emp_name=? After committing save transaction ***** Hibernate: select employee0_.emp_id as emp_id1_1_0_, employee0_.emp_name as emp_name2_1_0_, employee0_.emp_salary as emp_sala3_1_0_, address1_.emp_id as emp_id1_0_1_, address1_.address_line1 as address_2_0_1_, address1_as city3_0_1_, address1_.zipcode as zipcode4_0_1_ from EMPLOYEE employee0_ left outer join ADDRESS address1_ on employee0_.emp_id=address1_.emp_id where employee0_.emp_id=? package com.journaldev.hibernate.main; import org.hibernate.

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