Foreword: I met a few interviewers today who confused @Transactional annotations with mysql transactions. I deliberately wrote an article to talk about the difference between the two, and refused to memorize them to prevent embarrassing interviews for newcomers.
Start with a brief introduction
MySQL transaction
A MySQL transaction is a mechanism provided by a database management system to perform a set of database operations that either all commit successfully or fail and roll back. Transactions have the following four properties (often referred to as ACID properties):
- Atomicity : The operations in the transaction are either all executed successfully, or all failed and rolled back, and there will be no partial execution.
- Consistency : Before and after a transaction is executed, the state of the database must remain consistent.
- Isolation : Transactions are isolated from each other, and each transaction does not feel the existence of other transactions.
- Durability : Once a transaction is committed, its results will be permanently stored in the database and will not be lost even if the system fails.
@Transactional annotation
@TransactionalAnnotations are a mechanism used in programming to mark a method as a unit of transaction. It is commonly used in object-based programming models (such as Java) to manage the relationship between methods and database transactions. By adding annotations to the method @Transactional, you can tell the programming framework to start a transaction when executing the method. If the method is successfully executed, the transaction is committed, otherwise the transaction is rolled back.
The similarity is that
- Transaction management : Both MySQL transactions and
@Transactionalannotations involve handling the start, commit, and rollback of transactions. They can all ensure that a set of related operations are either all successfully executed and persisted, or all rolled back to maintain data consistency. - Concurrency control : Both MySQL transactions and
@Transactionalannotations are used to deal with concurrency issues that may arise during concurrent access to the database. They provide mechanisms to deal with concurrency issues such as dirty reads, non-repeatable reads, and phantom reads. - Data integrity and consistency : Both MySQL transactions and
@Transactionalannotations are concerned with maintaining data integrity and consistency. They ensure that operations within the scope of the transaction are either all successfully executed or rolled back to maintain data consistency.
@TransactionalAlthough there are differences in the implementation level and application scope of MySQL transactions and annotations, they are all designed to handle transaction-related operations and ensure data consistency and integrity. MySQL transactions are implemented at the database management system level, while @Transactionalannotations are implemented at the application level, usually in conjunction with specific programming frameworks and transaction managers.