spirng data JPA教程(四) 双数据源的配置

柔光的暖阳◎ 2022-03-26 04:04 624阅读 0赞

# spirng data JPA教程(四) 双数据源的配置 #

因为jpa是基于实体类的，所以双数据源的配置和mybaties 稍有不同，需要配置两套domain,两套repository

[项目地址][Link 1]

项目的目录如下：

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DataSourceConfig.java中配置双数据源

@Configuration
    public class DataSourceConfig { 
    
        @Bean(name = "primaryDataSource")
        @Primary
        @Qualifier("primaryDataSource")
        @ConfigurationProperties(prefix = "spring.primary.datasource")
        public DataSource primaryDatasource() { 
            System.out.println("数据源 1 连接成功");
            return DataSourceBuilder.create().build();
        }
    
        @Bean(name = "secondaryDataSource")
        @Qualifier("secondaryDataSource")
        @ConfigurationProperties(prefix = "spring.secondary.datasource")
        public DataSource secondaryDataSource() { 
            System.out.println("数据源 2 连接成功");
            return DataSourceBuilder.create().build();
        }
    }

数据源1 PrimaryConfig.java

@Configuration
    @EnableTransactionManagement
    @EnableJpaRepositories(
            entityManagerFactoryRef = "entityManagerFactoryPrimary",//配置连接工厂 entityManagerFactory
            transactionManagerRef = "transactionManagerPrimary", //配置 事物管理器 transactionManager
            basePackages = { "com.itguang.springbootmultidatasource.repository.test1"}//设置dao（repo）所在位置
    )
    public class PrimaryConfig { 
    
        @Autowired
        private JpaProperties jpaProperties;
    
        @Autowired
        @Qualifier("primaryDataSource")
        private DataSource primaryDataSource;
    
        @Bean(name = "entityManagerFactoryPrimary")
        @Primary
        public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) { 
    
            return builder
                    //设置数据源
                    .dataSource(primaryDataSource)
                    //设置数据源属性
                    .properties(getVendorProperties(primaryDataSource))
                    //设置实体类所在位置.扫描所有带有 @Entity 注解的类
                    .packages("com.itguang.springbootmultidatasource.domain")
                    .persistenceUnit("primaryPersistenceUnit")
                    .build();
        }
        private Map<String, String> getVendorProperties(DataSource dataSource) { 
            return jpaProperties.getHibernateProperties(dataSource);
        }
        /** * 事物管理器 * * @param builder * @return */
        @Bean(name = "transactionManagerPrimary")
        @Primary
        PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) { 
            return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
        }
    }

数据源2 SecondConfig.java

@Configuration
    @EnableTransactionManagement
    @EnableJpaRepositories(
            entityManagerFactoryRef="entityManagerFactorySecondary",
            transactionManagerRef="transactionManagerSecondary",
            basePackages= {  "com.itguang.springbootmultidatasource.repository.test2" })
    public class SecondaryConfig { 
    
        @Autowired
        private JpaProperties jpaProperties;
        @Autowired
        @Qualifier("secondaryDataSource")
        private DataSource secondaryDataSource;
    
        @Bean(name = "entityManagerSecondary")
        public EntityManager entityManager(EntityManagerFactoryBuilder builder) { 
            return entityManagerFactorySecondary(builder).getObject().createEntityManager();
        }
    
        @Bean(name = "entityManagerFactorySecondary")
        public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) { 
            return builder
                    .dataSource(secondaryDataSource)
                    .properties(getVendorProperties(secondaryDataSource))
                    .packages("com.itguang.springbootmultidatasource.domain2")
                    .persistenceUnit("secondaryPersistenceUnit")
                    .build();
        }
    
        private Map<String, String> getVendorProperties(DataSource dataSource) { 
            return jpaProperties.getHibernateProperties(dataSource);
        }
    
        @Bean(name = "transactionManagerSecondary")
        PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) { 
            return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
        }
    
    }

application.yml配置

spring:
      primary:
        datasource:
          url: jdbc:mysql://localhost:3306/test1?useUnicode=true
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver
      secondary:
        datasource:
          url: jdbc:mysql://localhost:3306/test2?useUnicode=true
          username: root
          password: root
          driver-class-name: com.mysql.jdbc.Driver
      jpa:
        hibernate:
          ddl-auto: update
          dialect: org.hibernate.dialect.MySQL5InnoDBDialect
        show-sql: true
    server:
      port: 9999

实体类 User 对应数据库 test1 中的user表

@Data
    @Entity
    @Table(name = "user")
    public class User implements Serializable { 
    
        private static final long serialVersionUID = 1L;
        @Id
        @GeneratedValue
        private Long id;
        @Column(nullable = false, unique = true)
        private String userName;
        @Column(nullable = false)
        private String passWord;
        @Column(nullable = false, unique = true)
        private String email;
        @Column(nullable = true, unique = true)
        private String nickName;
        @Temporal(TemporalType.TIMESTAMP)
        private Date regTime;
    
        public User() { 
        }
        public User(String userName, String passWord, String email, String nickName, Date regTime) { 
            this.userName = userName;
            this.passWord = passWord;
            this.email = email;
            this.nickName = nickName;
            this.regTime = regTime;
        }
    }

实体类Person 对应数据库test2 中的person表

@Data
    @Entity
    @Table(name = "person")
    public class Person implements Serializable { 
    
        private static final long serialVersionUID = 1L;
        @Id
        @GeneratedValue
        private Long id;
        @Column(nullable = false, unique = true)
        private String userName;
        @Column(nullable = false)
        private String passWord;
        @Column(nullable = false, unique = true)
        private String email;
        @Column(nullable = true, unique = true)
        private String nickName;
        @Column(nullable = false)
        private String regTime;
    
        public Person() { 
        }
        public Person(String userName, String passWord, String email, String nickName, String regTime) { 
            this.userName = userName;
            this.passWord = passWord;
            this.email = email;
            this.nickName = nickName;
            this.regTime = regTime;
        }
    
    }

UserRepository

public interface UserRepository extends JpaRepository<User,Long> { 
        User findByUserName(String userName);
        User findByUserNameOrEmail(String username, String email);
    }

personRepository

public interface personRepository extends JpaRepository<Person,Long>{ }

UserController 写几个简单的接口测试下

@RestController
    public class UserController { 
        @Resource
        private UserRepository userTest1Repository;
        @Resource
        private personRepository personRepository;
        @Resource
        private UserInfoRepository userInfoRepository;
        @GetMapping("getuser")
        public List<User> getAllUser( ){ 
            return userTest1Repository.findAll() ;
        }
        @GetMapping("getPerson")
        public List<Person> getAllPerson(){ 
            return personRepository.findAll();
        }
        @GetMapping("getUserInfo")
        public List getUserInfo(){ 
            return userInfoRepository.findAll();
        }
    }

引入Swagger

运行项目，访问 http://localhost:9999/swagger-ui.html

![format_png 1][]

测试一下：

![format_png 2][]

![format_png 3][]

![format_png 4][]

[项目地址][Link 2]

[Link 1]: https://github.com/wanggang-git/springboot-multi-datasource.git
[format_png]: /images/20220326/df82f6b055444a978a62a433a48e78d6.png
[format_png 1]: /images/20220326/ee1f35ee70a346398c94a88eb5cd0d06.png
[format_png 2]: /images/20220326/cb2fed73f47a4b67a433a5713d862d08.png
[format_png 3]: /images/20220326/9298c3609f0c4671975315ae58e294a8.png
[format_png 4]: /images/20220326/d4566ff1d92f4ada9a9b2d8b6cd19703.png
[Link 2]: https://github.com/bdqx007/springboot-multi-datasource.git