# mybatis多数据源配置

## dynamic-datasource

### 1、引入依赖

4.1.3版本是稳定版

```xml
<!-- dynamic-datasource -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>4.1.3</version>
</dependency>
```

### 2、配置数据源

需要注意的是，这里使用了druid，p6spy

需要配置对应的数据源，使用primary来指明默认的数据源

```yml
#配置数据源
spring:
  autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
  datasource:
    dynamic:
      primary: db1
      datasource:
        db1:
          driver-class-name: com.p6spy.engine.spy.P6SpyDriver
          url: jdbc:p6spy:mysql://${DB_HOST:127.0.0.1}:${DB_PORT:3306}/${DB_NAME:stand_lms}?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false&useOldAliasMetadataBehavior=true
          username: ${DB_USER:root}
          password: ${DB_PWD:12356}
          type: com.alibaba.druid.pool.DruidDataSource
        db2:
          driver-class-name: com.p6spy.engine.spy.P6SpyDriver
          url: jdbc:p6spy:mysql://${DB_HOST:127.0.0.1}:${DB_PORT:13306}/${DB_NAME:test}?serverTimezone=Asia/Shanghai&characterEncoding=utf8&useSSL=false&useOldAliasMetadataBehavior=true
          username: ${DB_USER:root}
          password: ${DB_PWD:12356}
          type: com.alibaba.druid.pool.DruidDataSource
```

集成了druid需要去除druid配置

```yml
 autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
```

去除框架原来对druid数据源的配置类

```java
//import com.alibaba.druid.pool.DruidDataSource;
//import lombok.extern.slf4j.Slf4j;
//import org.springframework.boot.context.properties.ConfigurationProperties;
//import org.springframework.context.annotation.Bean;
//import org.springframework.context.annotation.Configuration;
//import org.springframework.context.annotation.Primary;
//
//import javax.sql.DataSource;
//
//@Configuration
//@Slf4j
//public class DataBaseConfig {
//
//    @Primary
//    @Bean(name = "dataSource")
//    @ConfigurationProperties(prefix = "spring.datasource.druid")
//    public DataSource dataSource() {
//        return new DruidDataSource();
//    }
//
//}
```

排除掉DruidDataSourceAutoConfigure

在启动类中需要排除掉DruidDataSourceAutoConfigure.class，就是取消Druid的数据源的自动配置类。

```java
@SpringBootApplication(exclude = {
        DataSourceAutoConfiguration.class,
        DruidDataSourceAutoConfigure.class
})
```

也可以在配置类中

```yml
autoconfigure:
    exclude: com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure
```

### 3、测试

使用@DS("db2")注解实现切换数据源

```java
public interface TestMapper extends BaseMapper<JSONObject> {
    @DS("db2")
    JSONObject getAll13();
}
```