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一、第一步

在application-druid.yml里配置多个库的连接设置

# 主库数据源
master:
url: jdbc:mysql://111.111.111.1111:3306/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root

# 从库数据源1
slave:
# 从数据源开关/默认关闭
enabled: true
url: jdbc:mysql://111.111.111.1111:3306/test1?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root

# 从库数据源2
slaveData:
# 从数据源开关/默认关闭
enabled: true
url: jdbc:mysql://111.111.111.1111:3306/test3?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8
username: root
password: root

# 从库数据源3
...........................................................................

2.第二步

在ruoyi-common下的DataSourceType里配置数据源

3.第三步

修改ruoyi-framework下的DruidConfig文件

	@Bean
    @ConfigurationProperties("spring.datasource.druid.slave") //这里就是从库1
    @ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
    public DataSource slaveDataSource(DruidProperties druidProperties)
    {
        DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
        return druidProperties.dataSource(dataSource);
    }
    
	@Bean
    @ConfigurationProperties("spring.datasource.druid.slaveData") //这里就是从库2
    @ConditionalOnProperty(prefix = "spring.datasource.druid.slaveData", name = "enabled", havingValue = "true")
    public DataSource slaveData(DruidProperties druidProperties)
    {
        DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
        return druidProperties.dataSource(dataSource);
    }

    @Bean(name = "dynamicDataSource")
    @Primary
    public DynamicDataSource dataSource(DataSource masterDataSource)
    {
        Map<Object, Object> targetDataSources = new HashMap<>();
        targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
        setDataSource(targetDataSources, DataSourceType.SLAVE.name(), "slaveDataSource");//从库1
        setDataSource(targetDataSources, DataSourceType.SLAVEDATA.name(), "slaveData");//从库2
        return new DynamicDataSource(masterDataSource, targetDataSources);
    }

3.最后一步

在service上加上@DataSource(value = DataSourceType.MASTER)这个注解 DataSourceType.就是你想要连的那一个库 注：如果需要生成代码的也需要用到注解，生成那个库的表就用那个，GenController