SpringBoot多数据源配置

@Configuration

@Configuration用于定义配置类，可替换xml配置文件，被注解的类内部包含一个或多个被@Bean注解的方法，这些方法将会被AnnotationConfigApplicationContext或AnnotationConfigWebApplicationContext类进行扫描，并用于构建bean定义，初始化Spring容器。

• application.properties:以下数据库需要自行创建

spring.datasource.primary.url=jdbc:mysql://localhost:3306/test1
spring.datasource.primary.username=root
spring.datasource.primary.password=123456
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.secondary.url=jdbc:mysql://localhost:3306/test2
spring.datasource.secondary.uusername=root
spring.datasource.secondary.upassword=123456
spring.datasource.secondary.udriver-class-name=com.mysql.jdbc.Driver

一、多数据源配置及JdbcTemplate支持

@Configuration
public class DataSourceConfig {

    @Bean(name = "primaryDataSource")
    @Qualifier("primaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.primary")   //主数据源配置
    public DataSource primaryDataSource() { return DataSourceBuilder.create().build(); }

    @Bean(name = "secondaryDataSource")
    @Qualifier("secondaryDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.secondary")   //第二数据源配置
    public DataSource secondaryDataSource() { return DataSourceBuilder.create().build(); }


    //对JabcTemplate的支持只需要为其注入对应的datasource即可
    @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);
    }
}

• 测试代码：

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(Application.class)
public class ApplicationTests {

    @Autowired
    @Qualifier("primaryJdbcTemplate")
    protected JdbcTemplate jdbcTemplate1;

    @Autowired
    @Qualifier("secondaryJdbcTemplate")
    protected JdbcTemplate jdbcTemplate2;

    @Before
    public void setUp() {
        jdbcTemplate1.update("DELETE  FROM  USER ");
        jdbcTemplate2.update("DELETE  FROM  USER ");
    }

    @Test
    public void test() throws Exception {

        // 往第一个数据源中插入两条数据
        jdbcTemplate1.update("insert into user(id,name,age) values(?, ?, ?)", 1, "aaa", 20);
        jdbcTemplate1.update("insert into user(id,name,age) values(?, ?, ?)", 2, "bbb", 30);

        // 往第二个数据源中插入一条数据，若插入的是第一个数据源，则会主键冲突报错
        jdbcTemplate2.update("insert into user(id,name,age) values(?, ?, ?)", 1, "aaa", 20);

        // 查一下第一个数据源中是否有两条数据，验证插入是否成功
        Assert.assertEquals("2", jdbcTemplate1.queryForObject("select count(1) from user", String.class));

        // 查一下第一个数据源中是否有两条数据，验证插入是否成功
        Assert.assertEquals("1", jdbcTemplate2.queryForObject("select count(1) from user", String.class));
    }
}

二、Spring-data-jpa支持

• 对于数据源的配置可以延用一中的DataSourceConfig的实现。

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactoryPrimary",
        transactionManagerRef="transactionManagerPrimary",
        basePackages= { "com.didispace.domain.p" }) //设置Repository所在位置
public class PrimaryConfig {

    @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(primaryDataSource))
                .packages("com.didispace.domain.p") //设置实体类所在位置
                .persistenceUnit("primaryPersistenceUnit")
                .build();
    }

    @Autowired
    private JpaProperties jpaProperties;

    private Map<String, String> getVendorProperties(DataSource dataSource) {
        return jpaProperties.getHibernateProperties(dataSource);
    }

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

}