Spring’s @Transactional annotation has what characteristics?

The @Transactional annotation in Spring has the following characteristics:

1. The propagation behavior of transactions: The @Transactional annotation can specify the propagation behavior of transactions, including REQUIRED, SUPPORTS, MANDATORY, REQUIRES_NEW, NOT_SUPPORTED, and NEVER. By setting different propagation behaviors, the transaction relationships between methods can be controlled.
2. The isolation levels of transactions: The @Transactional annotation can also specify the isolation level of transactions, including DEFAULT, READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, and SERIALIZABLE, etc. Different isolation levels can control the visibility and concurrency of read and write operations between transactions.
3. Establishing rollback rules: The @Transactional annotation can establish rollback rules by specifying different types of exceptions to determine when a transaction should be rolled back. This can be achieved by setting the rollbackFor and noRollbackFor attributes to specify the types of exceptions that should trigger a rollback.
4. The timeout setting for transactions: The @Transactional annotation can also specify the timeout for a transaction by setting the timeout attribute, which controls the execution time of the transaction. If the transaction exceeds the specified timeout, it will be rolled back.
5. Exception handling: The @Transactional annotation can also be used to handle exceptions in methods. When an exception is caught in the method, the rollbackFor property can be set to determine whether to roll back the transaction.

In general, the @Transactional annotation is an important annotation in the Spring framework used to manage transactions, with flexible configuration options to control transaction relationships between methods according to requirements.