How to set transaction isolation level in Spring

How to set transaction isolation level in Spring: 1. Use @Transactional annotation; 2. Set in Spring configuration file; 3. Use PlatformTransactionManager; 4. Set in Java configuration class. Detailed introduction: 1. Use the @Transactional annotation, add the @Transactional annotation to the class or method that requires transaction management, and set the isolation level in the attribute; 2. In the Spring configuration file, etc.

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

In Spring, the setting of transaction isolation level can be achieved in the following ways:

1. Use @Transactional annotation: In the class or class that needs transaction management Add the @Transactional annotation on the method and set the isolation level in the attribute. Spring provides the following four isolation levels:

• Isolation.DEFAULT: The default isolation level, uses the default isolation level of the database.

• Isolation.READ_UNCOMMITTED: Read uncommitted, allowing transactions to see the data of other uncommitted transactions.

• Isolation.READ_COMMITTED: Read is committed, ensuring that the data modified by one transaction can only be read by other transactions after it is submitted.

• Isolation.REPEATABLE_READ: Repeatable reading, preventing dirty reads and non-repeatable reads, but phantom reads may occur. For example:

@Transactional(isolation = Isolation.READ_COMMITTED)  
public void updateAccount() {  
    // 更新账户的操作  
}

2. Set in the Spring configuration file: In the Spring configuration file, annotation-driven transactions can be enabled through the tx:annotation-driven tag Management, and set the isolation level through the tx:properties tag. For example:

<tx:annotation-driven isolation="READ_COMMITTED"/>

3. Use PlatformTransactionManager: Create a custom transaction manager by implementing the PlatformTransactionManager interface and set the isolation level in the implementation class. For example:

@Override  
public TransactionDefinition getTransactionDefinition() {  
    TransactionDefinition definition = new DefaultTransactionDefinition();  
    definition.setIsolationLevel(TransactionDefinition.ISOLATION_READ_COMMITTED);  
    return definition;  
}

4. Set in the Java configuration class: In the Java configuration class, you can enable transaction management through the @EnableTransactionManagement annotation and set the isolation level through the @Transactional annotation. For example:

@Configuration  
@EnableTransactionManagement(isolation = Isolation.READ_COMMITTED)  
public class AppConfig {  
    // 配置其他Bean  
}

No matter which method is used to set the transaction isolation level, you need to note that the default transaction isolation level of different databases may be different, so you need to consider the actual situation of the database when setting the isolation level. At the same time, the choice of transaction isolation level should be weighed based on specific business needs and performance requirements.

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