What is use of @transactional?

What is use of @transactional?

Generally the @Transactional annotation is written at the service level. It is used to combine more than one writes on a database as a single atomic operation. When somebody call the method annotated with @Transactional all or none of the writes on the database is executed.

What is the default rollback policy in transaction management?

While the EJB default behavior is for the EJB container to automatically roll back the transaction on a system exception (usually a runtime exception), EJB CMT does not roll back the transaction automatically on an application exception (that is, a checked exception other than java.

How do you fetch the records from the database using JdbcTemplate class?

Here in getDatasource() method we create a new Datasource and configure it. Create a new JdbcTemplate object, with the given datasource to obtain connections from. Use the queryForList(String sql) API method of JdbcTemplate class to execute a query for a result list, with the given static SQL select query.

What is spring boot transactional?

Transactions and Proxies. At a high level, Spring creates proxies for all the classes annotated with @Transactional, either on the class or on any of the methods. The proxy allows the framework to inject transactional logic before and after the running method, mainly for starting and committing the transaction.

Why do we use @transactional annotation?

The @Transactional annotation provides the following attributes: value and transactionManager – these attributes can be used to provide a TransactionManager reference to be used when handling the transaction for the annotated block.

Can we use hibernate with Spring?

We can simply integrate hibernate application with spring application. In hibernate framework, we provide all the database information hibernate. cfg. xml file.

What is the use of JdbcTemplate in Spring?

The Spring JDBC template allows to clean-up the resources automatically, e.g. release the database connections. The Spring JDBC template converts the standard JDBC SQLExceptions into RuntimeExceptions. This allows the programmer to react more flexible to the errors.

Can we use @transactional in controller?

The controller can be made @Transactional , but indeed it’s a common recommendation to only make the service layer transactional (the persistence layer should not be transactional either).