SpringBoot之JPA多数据源

依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

单数据源

properties：

spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

直接template注入就能使用

@Repository
public class UserRepositoryImpl implements UserRepository {
    @Autowired
    private JdbcTemplate jdbcTemplate;
}

多数据源

properties：

spring.datasource.primary.jdbc-url=jdbc:mysql://localhost:3306/test1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.primary.username=root
spring.datasource.primary.password=root
spring.datasource.primary.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/test2?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=true
spring.datasource.secondary.username=root
spring.datasource.secondary.password=root
spring.datasource.secondary.driver-class-name=com.mysql.cj.jdbc.Driver

注意点：第一行的url必须改为jdbc-url，即spring.datasource.*.jdbc-url

配置类：

@Configuration
public class DataSourceConfig {
    @Primary
    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @ConfigurationProperties(prefix="spring.datasource.primary")
    public DataSource primaryDataSource() {
            return DataSourceBuilder.create().build();
    }

    @Bean(name = "secondaryDataSource")
    @Qualifier("secondaryDataSource")
    @ConfigurationProperties(prefix="spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();      
    }

    @Bean(name="primaryJdbcTemplate")
    public JdbcTemplate primaryJdbcTemplate (
        @Qualifier("primaryDataSource")  DataSource dataSource ) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name="secondaryJdbcTemplate")
    public JdbcTemplate  secondaryJdbcTemplate(
            @Qualifier("secondaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }
}

为repository配上默认的template

@Repository
public class UserRepositoryImpl implements UserRepository {
    @Autowired
    private JdbcTemplate primaryJdbcTemplate;

    @Override
    public int save(User user,JdbcTemplate jdbcTemplate) {
        if(jdbcTemplate == null){
            jdbcTemplate= primaryJdbcTemplate;
        }
        return jdbcTemplate.update("INSERT INTO users(name, password, age) values(?, ?, ?)",
              user.getName(), user.getPassword(), user.getAge());
    }
}

使用时传入template做参数

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserRepositoryTests {
    @Autowired
    private UserRepository userRepository;
    @Autowired
    private JdbcTemplate primaryJdbcTemplate;
    @Autowired
    private JdbcTemplate secondaryJdbcTemplate;

    @Test
    public void testSave() {
        User user =new User("smile","123456",30);
        userRepository.save(user,primaryJdbcTemplate);
        userRepository.save(user,secondaryJdbcTemplate);
    }
}

转自CSDN图文课--作者：纯洁的微笑