Hibernate, I don't want to use #Transactional Annotaion,
I want to create it manually.
SO how can i create Manual Transaction in it..?
You could use programmatic transaction manager see here
Related
I have a JUnit 5 testcase which is annotated with #Transactional and it is calling save service (which uses JPA saveandFlush) first, and trying to retrieve the same data/entity by using find service, which is using plain JDBC for searching, but it is not able to find that entity.
When I tried using isolation of the transaction as read_uncommitted it threw exception saying "java.sql.SQLException: READ_COMMITTED and SERIALIZABLE are the only valid transaction levels" please note that I am using Oracle database.
Is there any other way we can read the data which is present in same transaction by JDBC code?
Oracle does not implement Read Uncommited isolation level, so you will not be able to see uncommited changes from other sessions.
As Mark Rotteveel and Marmite Bomber said, two different transactions/connections(JPA and JDBC) can not see each other's uncommitted data, specially for application having Oracle database.
I had to use spring managed jdbc template so that JPA and the JDBC template uses the same transaction and data is visible to each other.
Is there listeners available in javers which will be invoked before executing a specific operation.
For example, a method like preUpdate() which will be invoked before registering an update operation.
I am using javers with Mongo DB and Spring
PS: Looking for feature similar to conditional auditing in Hibernate Envers
There is no such feature in JaVers and no plans for adding it. You can implement these hooks in standard Spring AOP, for example by providing your implementation of JaversAuditableAspect.
What is the point of using spring transaction while we have database level transaction ?
If you use mysql, oracle or any other db in java, they provide methods to make things inside transaction then why spring transaction if I can do transaction using java DB driver methods ?
It's another layer of abstraction over the database transaction API. So if you wanted to use multiple databases with global transactions, Spring would allow you to do this. While I have never done it, I believe it would allow you to use DB2 and Hibernate together, for example.
Generally, what I've found is, if a feature is available in Spring, it's because there is a use case for it. They don't just put things into the framework without a reason.
Also, Spring provides declarative transaction demarcation, which produces more readable and maintainable Java code. The declarative approach lets us change the transaction strategy easily, without changing the code.
The Declarative transaction management approach allows you to manage the transaction with the help of configuration instead of hard coding in your source code. This means that you can separate transaction management from the business code. You only use annotations or XML based configuration to manage the transactions
We used Spring AOP along with Hibernate using this transaction strategy Here is an example, Spring AOP transaction mangement with Hibernate.
I am working with enterprise application that uses Spring 3.x with Hibernate annotated programming.I am working with hibernate Session object for performing db operations in my XYZDaoImpl class.
And my doubt is "Is it correct way to close Hibernate Session object every time after performing any CRUD operation?"
If it is not the correct way, please advise me the recommended way of opening/closing of hibernate Session Object.
can you post a bit daoImpl code......
If you use sessionFactory.getCurrentSession(), you will get current session..in this case framework automatically flushed and closed when the transaction ends (commit or rollback).
If you use sessionFactory.openSession(), you have to manage the session yourself and to flush and close it "manually".
No, when using hibernate with spring, you should not (manually) open or close sessions, but let spring manage the hibernate session for you. Spring manages the session as a transactional resource, so you have to configure transaction management correctly.
If you open/close the hibernate session manually, you are hardly using the integration between these two frameworks: the session management is the main feature of the integration.
The only reason to open/close a hibernate session in a spring context is to use the same session to span multiple transactions.
How to not use (disable) transaction manager in spring configuration?
I'm doing simple app that will add rows to database, so no need in any transactions.
So, is it possible configure in xml, not to create any transaction managers?
PS: i use hibernate if this matters anyhow.
If you don't configure a Transaction Manager, neither will Spring. Just don't add any <tx:> tags and don't configure any PlatformTransactionManager beans (in your case HibernateTransactionManager).