What are the implementation methods of spring programmatic transactions?

The implementation of spring programmatic transactions: 1. Use TransactionTemplate; 2. Use TransactionCallback and TransactionCallbackWithoutResult; 3. Use Transactional annotations; 4. Use TransactionTemplate in combination with @Transactional; 5. Customize the transaction manager.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Spring programmatic transaction management is a way to control transactions in applications. It allows developers to control the opening, submission and rollback of transactions programmatically. This approach is more flexible than declarative transaction management because developers can more precisely control transaction boundaries and behavior.

The following is how Spring programmatic transaction management is implemented:

1. Use TransactionTemplate:

TransactionTemplate is a template class provided by Spring. Use To simplify code for programmatic transaction management. It provides the execute method, and developers can pass the transaction logic that needs to be executed as parameters to this method. Inside the execute method, TransactionTemplate will automatically start the transaction, commit or rollback the transaction.

Sample code:

@Autowired  
private PlatformTransactionManager transactionManager;  
  
public void someBusinessLogic() {  
    TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager);  
    transactionTemplate.execute(new TransactionCallbackWithoutResult() {  
        @Override  
        protected void doInTransactionWithoutResult(TransactionStatus status) {  
            // 执行事务逻辑  
            // ...  
            status.setRollbackFor(Exception.class); // 回滚事务  
        }  
    });  
}

2. Use TransactionCallback and TransactionCallbackWithoutResult:

These two interfaces are callback interfaces provided by Spring and are used in transactions Execute transaction logic in templates. Developers can implement these two interfaces and define their own transaction logic. In the callback method, developers can use the TransactionStatus object to control the commit and rollback of the transaction.

3. Use Transactional annotation:

Starting from Spring 4.0, you can use @Transactional annotation to implement programmatic transaction management. This annotation can be marked on the method to indicate that the method is a transaction method. Spring will automatically detect this annotation and use the transaction manager to control the opening, submission and rollback of transactions. Using annotations can make the code more concise and reduce the tediousness of manually writing transaction code.

@Service  
public class MyServiceImpl implements MyService {  
    @Autowired  
    private AnotherService anotherService;  
  
    @Transactional  
    public void doSomething() {  
        // 执行事务逻辑  
        anotherService.doSomething();  
        // ...  
    }  
}

4. Use TransactionTemplate in combination with @Transactional:

In actual development, you can choose to use TransactionTemplate or @Transactional to manage transactions as needed. Under normal circumstances, for situations where precise control of transaction logic is required, TransactionTemplate can be used; for simple business methods, the @Transactional annotation can be used to implement transaction management more concisely and clearly.

5. Custom transaction manager:

If the default transaction manager cannot meet the needs, developers can customize the transaction manager and inject it into the corresponding in the component. Custom transaction managers can provide more flexible transaction control strategies, such as supporting customized transaction propagation behavior, isolation levels, etc. When customizing the transaction manager, you need to implement the PlatformTransactionManager interface and override the corresponding methods to provide customized transaction logic.

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