What is the implementation principle of AOP transactions?

The main aspects of implementing transactions in AOP (Aspect-Oriented Programming) include the following:

1. 代理模式：AOP事务利用动态代理技术，在运行时生成代理对象，该代理对象会包装目标对象的方法调用，从而在方法执行前后添加额外的逻辑，比如开启和提交事务。
2. Transaction interceptor: AOP transactions add transaction management logic through interceptors before and after the target method is executed. The interceptor will begin a database transaction before the method is executed, and based on the success of the method execution, it will decide whether to commit or rollback the transaction after the method is executed.
3. Transaction annotation: AOP transactions can be specified to be managed by annotating the target method with transactional annotations. These annotations can include configuration information such as the type of transaction (e.g. REQUIRED, REQUIRES_NEW), isolation level, and propagation behavior.
4. Transaction Manager: AOP transactions require the use of a transaction manager to control the database transactions. The transaction manager is responsible for starting, committing, and rolling back transactions, as well as providing isolation levels for transactions.

In conclusion, the implementation principle of AOP transaction mainly involves creating proxy objects through proxy pattern, adding transaction management logic before and after method execution through transaction interceptors, specifying methods that require transaction management through transaction annotations, and managing database transactions through transaction managers.