SpringBoot系列15-mysql-multiple-data-sources1

springboot 多數據源的一個簡單示例

多數據源分包加載

新建數據庫test1和表tbl_user

CREATE TABLE `tbl_user` (
  `id` int(11) NOT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

新建數據庫test2和表tbl_order

CREATE TABLE `tbl_order` (
  `id` int(11) NOT NULL,
  `name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

數據源配置application.properties文件

## test1 database 配置
spring.datasource.test1.jdbc-url=jdbc:mysql://localhost:3306/test1?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.test1.username=root
spring.datasource.test1.password=root
spring.datasource.test1.driver-class-name=com.mysql.jdbc.Driver
## test2 database 配置
spring.datasource.test2.jdbc-url=jdbc:mysql://localhost:3306/test2?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
spring.datasource.test2.username=root
spring.datasource.test2.password=root
spring.datasource.test2.driver-class-name=com.mysql.jdbc.Driver

加載配置

主庫配置DataSourceConfig1.java

//表示這個類爲一個配置類
@Configuration
// 配置mybatis的接口類放的地方
@MapperScan(basePackages = "com.yuanfenge.demo.dao.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSourceConfig1 {
    // 將這個對象放入Spring容器中
    @Bean(name = "test1DataSource")
    // 表示這個數據源是默認數據源
    @Primary
    // 讀取application.properties中的配置參數映射成爲一個對象
    // prefix表示參數的前綴
    @ConfigurationProperties(prefix = "spring.datasource.test1")
    public DataSource getDateSource1() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "test1SqlSessionFactory")
    // 表示這個數據源是默認數據源
    @Primary
    // @Qualifier表示查找Spring容器中名字爲test1DataSource的對象
    public SqlSessionFactory test1SqlSessionFactory(@Qualifier("test1DataSource") DataSource datasource)
        throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
            // 設置mybatis的xml所在位置
            new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/test01/*.xml"));
        return bean.getObject();
    }
    @Bean("test1SqlSessionTemplate")
    // 表示這個數據源是默認數據源
    @Primary
    public SqlSessionTemplate test1sqlsessiontemplate(
        @Qualifier("test1SqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

從庫配置DataSourceConfig2.java

@Configuration
@MapperScan(basePackages = "com.yuanfenge.demo.dao.test02", sqlSessionFactoryRef = "test2SqlSessionFactory")
public class DataSourceConfig2 {
    @Bean(name = "test2DataSource")
    @ConfigurationProperties(prefix = "spring.datasource.test2")
    public DataSource getDateSource2() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "test2SqlSessionFactory")
    public SqlSessionFactory test2SqlSessionFactory(@Qualifier("test2DataSource") DataSource datasource)
        throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(datasource);
        bean.setMapperLocations(
            new PathMatchingResourcePatternResolver().getResources("classpath*:mapper/test02/*.xml"));
        return bean.getObject();
    }
    @Bean("test2SqlSessionTemplate")
    public SqlSessionTemplate test2sqlsessiontemplate(
        @Qualifier("test2SqlSessionFactory") SqlSessionFactory sessionfactory) {
        return new SqlSessionTemplate(sessionfactory);
    }
}

測試controller

/**
 * @auth 猿份哥
 * @description
 * @createTime 2020 - 5 - 19 16:45
 */
@RestController
public class TestController {

    @Autowired
    TestService testService;

    @RequestMapping("/test")
    public Object test(){
        List<Order> list = testService.selectOrder();
        return list;
    }
    @RequestMapping("/test2")
    public Object test2(){
        int i = testService.saveOrder();
        String msg=i>0?"success":"failed";
        return msg;
    }

}

總結

分包加載不支持分佈式事物，如果是多個數據庫的事物@Transaction將會失效，所以使用這種方式要避免分佈式事物。

源碼下載鏈接

原文鏈接: https://www.lskyf.com/post/103

作者：猿份哥，版權所有，歡迎保留原文鏈接進行轉載：)