SpringBoot和JPA多数据源整合

前言

项目中经常会遇到使用多个数据源的情况。这里是基于 JPA 来配置多个数据源。此配置是给予java1.8，闲话少说，一起来看看文章内容吧。

1.引入maven依赖

<dependencies>
    <!--****spring data jpa ****-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <!--**** web-services ****-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web-services</artifactId>
    </dependency>

    <!--**** lombok ****-->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>

    <!--**** 阿里的数据源 ****-->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.10</version>
    </dependency>

    <!--**** mysql ****-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>

    <!--**** test ****-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
</dependencies>

2.配置数据库和jpa一些简易配置

spring:
  datasource:
    primary:
      driver-class-name: com.mysql.jdbc.Driver      url: jdbc:mysql://localhost:3306/primary?useUnicode=true&characterEncoding=UTF-8&useOldAliasMetadataBehavior=true&serverTimezone=Asia/Shanghai
      username: root
      password: root
    second:
      driver-class-name: com.mysql.jdbc.Driver      url: jdbc:mysql://localhost:3306/second?useUnicode=true&characterEncoding=UTF-8&useOldAliasMetadataBehavior=true&serverTimezone=Asia/Shanghai
      username: root
      password: root
  jpa:
    show-sql: false
    hibernate:
      format_sql: true
      primary-dialect: org.hibernate.dialect.MySQL55Dialect
      second-dialect: org.hibernate.dialect.MySQL55Dialect

3.多数据源配置

DataSourceConfig

@Configuration
public class DataSourceConfig {

    /**
     * 第一个数据连接，默认优先级最高
     * @return
     */
    @Primary
    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @ConfigurationProperties(prefix="spring.datasource.primary")
    public DataSource PrimaryDataSource() {
        return DataSourceBuilder.create().type(DruidDataSource.class).build();
    }

    /**
     * 第二个数据源
     * @return
     */
    @Bean(name = "secondDataSource")
    @Qualifier("secondDataSource")
    @ConfigurationProperties(prefix="spring.datasource.second")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().type(DruidDataSource.class).build();
    }
}

PrimaryConfig

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary",
        transactionManagerRef="transactionManagerPrimary",
        basePackages= { "xin.zhuyao.springbootjapdatasource.repository.primary" })
public class PrimaryConfig {

    @Autowired
    private Environment env;

    @Autowired
    @Qualifier("primaryDataSource")
    private DataSource primaryDataSource;

    @Primary
    @Bean(name = "entityManagerPrimary")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
    }

    @Primary
    @Bean(name = "entityManagerFactoryPrimary")
    public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(primaryDataSource)
                .properties(getVendorProperties())
                .packages("xin.zhuyao.springbootjapdatasource.domain.primary")
                .persistenceUnit("primaryPersistenceUnit")
                .build();
    }



    private Map<String, String> getVendorProperties() {
        Map<String, String> jpaProperties = new HashMap<>(16);
        jpaProperties.put("hibernate.hbm2ddl.auto", "update");
        jpaProperties.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
        jpaProperties.put("hibernate.format_sql", env.getProperty("spring.jpa.hibernate.format_sql"));
        jpaProperties.put("hibernate.dialect", env.getProperty("spring.jpa.hibernate.primary-dialect"));
        jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
        return jpaProperties;
    }

    @Primary
    @Bean(name = "transactionManagerPrimary")
    public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
    }
}

SecondConfig

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        //实体管理
        entityManagerFactoryRef="entityManagerFactorySecond",
        //事务管理
        transactionManagerRef="transactionManagerSecond",
        //实体扫描,设置Repository所在位置
        basePackages= { "xin.zhuyao.springbootjapdatasource.repository.second" })
public class SecondConfig {

    @Autowired
    @Qualifier("secondDataSource")
    private DataSource secondDataSource;

    @Autowired
    private Environment env;

    @Bean(name = "entityManagerSecond")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return entityManagerFactorySecond(builder).getObject().createEntityManager();
    }

    @Bean(name = "entityManagerFactorySecond")
    public LocalContainerEntityManagerFactoryBean entityManagerFactorySecond (EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(secondDataSource)
                .properties(getVendorProperties())
                .packages("xin.zhuyao.springbootjapdatasource.domain.second")
                .persistenceUnit("secondPersistenceUnit")
                .build();
    }

    private Map<String, String> getVendorProperties() {
        Map<String, String> jpaProperties = new HashMap<>(16);
        jpaProperties.put("hibernate.hbm2ddl.auto", "update");
        jpaProperties.put("hibernate.show_sql", env.getProperty("spring.jpa.show-sql"));
        jpaProperties.put("hibernate.dialect", env.getProperty("spring.jpa.hibernate.Second-dialect"));
        jpaProperties.put("hibernate.format_sql", env.getProperty("spring.jpa.hibernate.format_sql"));
        jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
        return jpaProperties;
    }

    @Bean(name = "transactionManagerSecond")
    PlatformTransactionManager transactionManagerSecond(EntityManagerFactoryBuilder builder) {
        return new JpaTransactionManager(entityManagerFactorySecond(builder).getObject());
    }
}

这样整体就结束了，配置就结束了，可以写测试了。

4.测试

UserPrimaryEntity

@Data
@Entity
@NoArgsConstructor
@Table(name = "t_user")
@FieldDefaults(level = AccessLevel.PRIVATE)
public class UserPrimaryEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Long id;

    /**
     * 名称
     */
    String name;

    /**
     * 性别
     */
    String sex;
}

UserSecondEntity

@Data
@Entity
@NoArgsConstructor
@Table(name = "t_user")
@FieldDefaults(level = AccessLevel.PRIVATE)
public class UserSecondEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    Long id;

    /**
     * 名称
     */
    String name;

    /**
     * 性别
     */
    String sex;
}

UserPrimaryRepository

@Repository
public interface UserPrimaryRepository extends JpaRepository<UserPrimaryEntity, Long> {

}

UserSecondRepository

@Repository
public interface UserSecondRepository extends JpaRepository<UserSecondEntity, Long> {

}

SpringbootJapDatasourceApplicationTests

@SpringBootTest
class SpringbootJapDatasourceApplicationTests {

    @Autowired
    private UserPrimaryRepository userPrimaryRepository;
    @Autowired
    private UserSecondRepository userSecondRepository;

    @Test
    void contextLoads() {
        System.out.println(userPrimaryRepository.findAll());
        System.out.println(userSecondRepository.findAll());
    }

}

测试结果：

[UserPrimaryEntity(id=1, name=zy, sex=男)]
[UserSecondEntity(id=1, name=wl, sex=女)]

源码：https://github.com/zywaiting/springboot-jap-datasource