Principles and implementation of affairs management in the Spring ORM framework
Principles and implementation of affairs management in the Spring ORM framework
introduction:
When performing database operations, transaction management is very critical.The Spring ORM framework provides us with a simple and flexible way to manage transactions. It allows us to uniform transaction management of database operations to ensure the consistency and integrity of data.This article will introduce the principles and implementation methods of transaction in the Spring ORM framework, and provide some Java code examples to help understanding.
1. Principles of transaction management:
In the Spring ORM framework, the core principle of transaction management is implemented by AOP (programming faces).Spring uses AOP to woven the database operation into transaction management so that some logical processing can be performed before and after the database operation is performed.In Spring, transactions are managed at the level level, and the boundary of transaction is defined by adding @Transactions annotations to the method.
2. Implementation of transaction management:
The transaction management in the Spring ORM framework can be implemented in two ways: programming transaction management and declarative transaction management.
2.1 Programming transaction management
Programming transaction management is manually managed by programming.Developers need to use programming methods to start, submit or roll back transactions in the code.The following is an example code using programming transaction management:
@Autowired
private PlatformTransactionManager transactionManager;
@Transactional
public void performTransaction() {
TransactionStatus status = transactionManager.getTransaction(new DefaultTransactionDefinition());
try {
// Execute the database operation
// ...
transactionManager.commit(status);
} catch (Exception e) {
transactionManager.rollback(status);
throw e;
}
}
In the above examples, we use the annotation of `@transactional` to declare a transaction, and then use the` PlatformtransactionManager` to start, submit or roll back.
2.2 Declaration transaction management
Declaration transaction management is to manage transactions by configuration.Developers only need to perform related configuration in the configuration file. The Spring framework will automatically create agent objects for us and complete transaction management.Here are a sample code that uses declarative transaction management:
XML configuration method:
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" propagation="REQUIRED" />
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut id="serviceMethods" expression="execution(* com.example.service.*.*(..))" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethods" />
</aop:config>
In the above examples, we first define a `jpatractionManager` named` jpatransactionManager` named `TransactionManager`, and then use the` TX: advice` to configure the attributes of transactions, such as spreading behaviors and transaction names.Finally, the entry point and enhancement are defined in the `AOP: Config`, so that transactions can be injected into the specified service method.
Note method:
When using the annotation method, we need to enable the transaction manager in the configuration file, and add the `@transactional` annotation to the corresponding service class or method.For example:
<tx:annotation-driven transaction-manager="transactionManager" />
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
@Transactional
public void addUser(User user) {
userRepository.add(user);
}
// ...
}
In the above examples, we enabled the annotation -driven transaction manager in the configuration file, and add the `@transactional` annotations to the` adduser` method in the `UserService` class.
in conclusion:
The principle of transaction management in the Spring ORM framework is implemented through AOP. It can be managed by programming transaction management and declarative transaction management.Programming transaction management needs to manually write code to control the beginning, submission, and rollback of the transaction, and declaration of statement management to manage transactions through configuration files, so that transaction management is separated from business logic.In the way, the Spring ORM framework provides a simple and flexible transaction management mechanism to help us better manage database operations and ensure the consistency and integrity of data.
