一、除了MySQL驱动，我们还需要用到postgresql的驱动，所以我们先把驱动的依赖给导入进来

       
        
            org.postgresql
            postgresql
        

二，修改application-druid.yml:

# 数据源配置
spring:
    datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        druid:
            # 主库数据源
            master:
                driverClassName: com.mysql.cj.jdbc.Driver
                url: jdbc:mysql://localhost:3306/i_ren_shi?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
                username: root
                password: root
            # 从库数据源
            slave:
                # 从数据源开关/默认关闭
                enabled: true
                driverClassName: org.postgresql.Driver
                url: jdbc:postgresql://localhost:5432/easytrack
                username: 123456
                password: 123456
            easytrack:
                # 从数据源开关/默认关闭
                enabled: true
                driverClassName: org.postgresql.Driver
                url: jdbc:postgresql://localhost:5432/easytrack
                username: 123456
                password: 123456

三、新数据源的配置

（1）修改DatasourceType

package com.ruoyi.common.enums;
/**
 * 数据源
 * 
 * @author ruoyi
 */
public enum DataSourceType
{
    /**
     * 主库
     */
    MASTER,
    /**
     * 从库
     */
    SLAVE,
    /**
     * 新配置数据源名称
     */
    EASYTRACK
}

（2）修改DruidConfig，这里有很多细节要注意，就是大小写的问题

  @Bean
    @ConfigurationProperties("spring.datasource.druid.easytrack")
    @ConditionalOnProperty(prefix = "spring.datasource.druid.easytrack", name = "enabled", havingValue = "true")
    public DataSource easyTrackDataSource(DruidProperties druidProperties)
    {
        DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
        return druidProperties.dataSource(dataSource);
    }
    @Bean(name = "dynamicDataSource")
    @Primary
    public DynamicDataSource dataSource(DataSource masterDataSource)
    {
        Map targetDataSources = new HashMap<>();
        targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
        setDataSource(targetDataSources, DataSourceType.SLAVE.name(), "slaveDataSource");
        setDataSource(targetDataSources, DataSourceType.EASYTRACK.name(), "easyTrackDataSource");
        return new DynamicDataSource(masterDataSource, targetDataSources);
    }

（3）使用选择数据源，会自动切换数据源

@DataSource(value = DataSourceType.EASYTRACK)