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Spring -- 多数据源

不同数据源的 配置要分开
关注每次使用的数据源
- 有多个DataSource时系统如何判断
- 对应的设施（事务、ORM）如何选择DataSource

多数据源配置（二选一）

配置 @Primary 类型的Bean（DataSource）
排除Spring Boot的自动配置（ 手动配置 ）
- DataSourceAutoConfiguration
- DataSourceTransactionManagerAutoConfiguration
- JdbcTemplateAutoConfiguration

依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <scope>runtime</scope>
</dependency>

application.properties

management.endpoints.web.exposure.include=*
foo.datasource.url=jdbc:h2:mem:foo
foo.datasource.username=SA
foo.datasource.password=
bar.datasource.url=jdbc:h2:mem:bar
bar.datasource.username=SA
bar.datasource.password=

DataSourceConfig

@Slf4j
@Configuration
public class DataSourceConfig {

    @Bean
    @ConfigurationProperties("foo.datasource")
    public DataSourceProperties fooDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    public DataSource fooDataSource() {
        DataSourceProperties dataSourceProperties = fooDataSourceProperties();
        log.info("foo datasource : {}", dataSourceProperties.getUrl());
        return dataSourceProperties.initializeDataSourceBuilder().build();
    }

    @Bean
    @Resource
    public PlatformTransactionManager fooTxManager(DataSource fooDataSource) {
        return new DataSourceTransactionManager(fooDataSource);
    }

    @Bean
    @ConfigurationProperties("bar.datasource")
    public DataSourceProperties barDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    public DataSource barDataSource() {
        DataSourceProperties dataSourceProperties = barDataSourceProperties();
        log.info("bar datasource : {}", dataSourceProperties.getUrl());
        return dataSourceProperties.initializeDataSourceBuilder().build();
    }

    @Bean
    @Resource
    public PlatformTransactionManager barTxManager(DataSource barDataSource) {
        return new DataSourceTransactionManager(barDataSource);
    }

}

MultiDatasourceApplication

// 排查自动配置
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,
        DataSourceTransactionManagerAutoConfiguration.class,
        JdbcTemplateAutoConfiguration.class})
public class MultiDatasourceApplication {

    public static void main(String[] args) {
        SpringApplication.run(MultiDatasourceApplication.class, args);
    }

}

foo datasource : jdbc:h2:mem:foo
bar datasource : jdbc:h2:mem:bar

beans

"fooDataSource": {
    "aliases": [],
    "scope": "singleton",
    "type": "com.zaxxer.hikari.HikariDataSource",
    "resource": "class path resource [me/zhongmingmao/multidatasource/DataSourceConfig.class]",
    "dependencies": ["fooDataSourceProperties"]
}

"fooTxManager": {
    "aliases": [],
    "scope": "singleton",
    "type": "org.springframework.jdbc.datasource.DataSourceTransactionManager",
    "resource": "class path resource [me/zhongmingmao/multidatasource/DataSourceConfig.class]",
    "dependencies": ["fooDataSource"]
}

原文 http://zhongmingmao.me/2019/07/27/spring-multi-data-source/

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