感謝您的閱讀,本文由 楊斌的博客 版權全部。 如若轉載,請註明出處:楊斌的博客(y0ngb1n.github.io/a/config-mu…)html
項目已託管於 GitHub:y0ngb1n/spring-boot-samples,歡迎 Star, Fork 😘java
不一樣數據源的配置要分開git
在 Spring 中,咱們須要將兩個不一樣數據源的配置分開。如咱們有一個 foo-datasource
和另外一個 bar-datasource
,那將這兩個 DataSource 的全部配置都要分開,不要將它們放在一塊兒,就算它們除了 url
之外其它配置都相同,也建議你將它們分開配置,這樣會方便咱們之後的配置管理。github
關注每次使用的數據源spring
在編程的時候,咱們要格外地注意當前在操做哪個數據源,要告訴咱們的系統要使用哪個數據源,事務管理應該啓在哪一個數據源上面;同時地咱們也要告訴相關 ORM(像 Hibernate、MyBatis 相似的設施)此時是在操做哪個數據源,由於這些框架並無幫咱們考慮得這麼周全,因此在編碼時必定要格外地當心。編程
手工配置兩組 DataSource 及相關內容bash
若是咱們徹底地靠手工的配置,排除掉整個 Spring Boot 相關的依賴,所有都交由本身來配置確定是能夠的。app
若是仍是想與 Spring Boot 結合在一塊兒的話能夠參考下面的兩種方式。框架
與 Spring Boot 協同工做(二選一)curl
@Primary
類型的 BeanDataSourceAutoConfiguration
DataSourceTransactionManagerAutoConfiguration
JdbcTemplateAutoConfiguration
方式一:Spring 會把配置了 @Primary
的 Bean 做爲主要的 Bean,在後面 Spring Boot 相關的自動配置都會環繞這個標誌了 @Primary
的 DataSource 進行配置。
方式二:若是你以爲這兩個 Bean 是沒有主次之分、這兩個 DataSource 都同等重要的,那麼咱們能夠排除掉方式二所列舉的 Bean。把它們排除掉以後,咱們能夠在代碼中本身來控制它,可參考以下代碼:
Step 01:排除 Spring Boot 的自動配置
@SpringBootApplication(exclude = {
DataSourceAutoConfiguration.class,
DataSourceTransactionManagerAutoConfiguration.class,
JdbcTemplateAutoConfiguration.class
})
public class MultiDataSourceApplication {
public static void main(String[] args) {
SpringApplication.run(MultiDataSourceApplication.class, args);
}
}
複製代碼
Step 02:添加 foo
、bar
數據源配置
# Foo DataSource
foo:
datasource:
url: jdbc:h2:mem:foo
username: sa
password:
# Bar DataSource
bar:
datasource:
url: jdbc:h2:mem:bar
username: sa
password:
複製代碼
Step 03: 分別爲 foo-datasource
、bar-datasource
添加配置,及對應的事務管理器
@Slf4j
@Configuration
public class MultiDataSourceConfig {
//---------------------------------------------------------------------
// Config Foo DataSource
//---------------------------------------------------------------------
@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);
}
//---------------------------------------------------------------------
// Config Bar DataSource
//---------------------------------------------------------------------
@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);
}
}
複製代碼
Step 04: 檢驗是否配置成功
$ mvn spring-boot:run
...
2019-09-18 23:57:21.649 INFO 15826 --- [ main] i.g.y.s.m.config.MultiDataSourceConfig : foo datasource: jdbc:h2:mem:foo
2019-09-18 23:57:21.708 INFO 15826 --- [ main] i.g.y.s.m.config.MultiDataSourceConfig : bar datasource: jdbc:h2:mem:bar
...
$ curl -s http://localhost:8080/actuator/beans | jq
{
"contexts": {
"application": {
"beans": {
...
"fooDataSourceProperties": {
"aliases": [],
"scope": "singleton",
"type": "org.springframework.boot.autoconfigure.jdbc.DataSourceProperties",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": []
},
"fooDataSource": {
"aliases": [],
"scope": "singleton",
"type": "com.zaxxer.hikari.HikariDataSource",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": [
"fooDataSourceProperties"
]
},
"fooTxManager": {
"aliases": [],
"scope": "singleton",
"type": "org.springframework.jdbc.datasource.DataSourceTransactionManager",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": [
"fooDataSource"
]
},
...
"barDataSourceProperties": {
"aliases": [],
"scope": "singleton",
"type": "org.springframework.boot.autoconfigure.jdbc.DataSourceProperties",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": []
},
"barDataSource": {
"aliases": [],
"scope": "singleton",
"type": "com.zaxxer.hikari.HikariDataSource",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": [
"barDataSourceProperties"
]
},
"barTxManager": {
"aliases": [],
"scope": "singleton",
"type": "org.springframework.jdbc.datasource.DataSourceTransactionManager",
"resource": "class path resource [io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": [
"barDataSource"
]
},
...
"multiDataSourceConfig": {
"aliases": [],
"scope": "singleton",
"type": "io.github.y0ngb1n.samples.multidatasource.config.MultiDataSourceConfig$$EnhancerBySpringCGLIB$$63c24bed",
"resource": "file [/Users/yangbin/workspace/coding/Java/spring-boot-samples/spring-boot-samples-multi-datasource/target/classes/io/github/y0ngb1n/samples/multidatasource/config/MultiDataSourceConfig.class]",
"dependencies": []
},
...
},
"parentId": null
}
}
}
複製代碼
上面能夠查看到 Spring 中各 Bean 的依賴關係。
這樣就完成了 Spring Boot 中多數據源的配置。若是咱們還有更多的數據源的話,配置也是相似的,參考上面的配置便可。