只要更改每个模块的application.yml，如：

client模块配置oracle数据源：

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8011/eureka/
server:
  port: 8017
spring:
  application:
    name: bjzd-base
  datasource:
    url: jdbc:oracle:thin:@localhost:1521:ORCL
    username: BJZD
    password: BJZD
    driver-class-name: oracle.jdbc.driver.OracleDriver
mybatis: 
  mapper-locations: mapper/**Mapper.xml
  configuration:
      map-underscore-to-camel-case: true

base模块配置mySql数据源：

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8011/eureka/
security:
  basic:
    enabled: false
server:
  port: 8015
spring:
  application:
    name: bjzd-client
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/clouddo?useUnicode=true&characterEncoding=utf8
    username: root
    password: root
  jackson:
    date-format: yyyy-MM-dd
    time-zone: GMT+8
mybatis:
  mapper-locations: mapper/**Mapper.xml
  configuration:
      map-underscore-to-camel-case: true
logging:
  level: debug