要使用Axon和MySql的JPA事件存储，您需要进行以下步骤：

1. 添加所需的依赖项：

    org.axonframework
    axon-spring-boot-starter
    ${axon.version}


    org.axonframework
    axon-jpa
    ${axon.version}


    org.springframework.boot
    spring-boot-starter-data-jpa


    mysql
    mysql-connector-java

2. 设置数据库连接： 在application.properties文件中添加以下配置：

spring.datasource.url=jdbc:mysql://localhost:3306/your_database_name
spring.datasource.username=your_username
spring.datasource.password=your_password
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update

请确保将your_database_name替换为您的数据库名称，并将your_username和your_password替换为您的数据库凭据。

3. 创建一个Axon配置类：

@Configuration
public class AxonConfig {

    @Autowired
    public void configure(EventHandlingConfiguration configuration, EntityManagerProvider entityManagerProvider) {
        configuration.registerEventProcessor("your_event_processor_name", c -> JpaEventProcessor.builder()
                .name("your_event_processor_name")
                .entityManagerProvider(entityManagerProvider)
                .transactionManager(new SpringTransactionManager(c.getBean(EntityManagerFactory.class)))
                .build());

        configuration.assignProcessingGroup("your_event_processor_name", "your_processing_group_name");
    }
}

请将your_event_processor_name和your_processing_group_name替换为您自己的名称。

4. 创建一个聚合根类：

@Aggregate
public class YourAggregate {

    @AggregateIdentifier
    private String id;

    // Add your aggregate methods and event handlers here
}

5. 创建一个命令处理器类：

@Component
public class YourCommandHandler {

    @CommandHandler
    public void handle(YourCommand command, Repository repository) {
        // Handle the command and apply events to the aggregate
        YourAggregate aggregate = new YourAggregate();
        aggregate.apply(new YourEvent(command.getId()));
        repository.save(aggregate);
    }
}

6. 创建一个查询模型类：

@Entity
public class YourQueryModel {

    @Id
    private String id;

    // Add your query model properties here
}

7. 创建一个事件处理器类：

@Component
public class YourEventHandler {

    @EventHandler
    public void handle(YourEvent event, YourRepository repository) {
        // Create or update the query model based on the event
        YourQueryModel queryModel = repository.findById(event.getId())
                .orElseGet(() -> new YourQueryModel(event.getId()));

        // Update the query model properties
        // ...

        repository.save(queryModel);
    }
}

8. 创建一个查询模型的Spring Data JPA存储库接口：

public interface YourRepository extends JpaRepository {
    
    // Add custom queries if needed
    
}

这样，您就可以使用Axon和MySql的JPA事件存储了。