增加数据库主备自动切换功能

pom.xml

@@ -53,6 +53,7 @@
             <artifactId>druid-spring-boot-starter</artifactId>
             <version>${druid.version}</version>
         </dependency>
+
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>

src/main/resources/application-test.yml

@@ -27,11 +27,12 @@ spring:
   datasource:
     druid:
       url: jdbc:mysql://127.0.0.1:3306/db_smart_city_usercenter?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&autoReconnect=true&failOverReadOnly=false&useSSL=false&serverTimezone=UTC&nullCatalogMeansCurrent=true
+      # standby-url: jdbc:mysql://192.168.0.151:3306/db_smart_city_usercenter?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&autoReconnect=true&failOverReadOnly=false&useSSL=false&serverTimezone=UTC&nullCatalogMeansCurrent=true
       db-type: mysql
       driver-class-name: com.mysql.cj.jdbc.Driver
       username: root
       password: root
-      initial-size: 2
+      initial-size: 1
       min-idle: 2
       max-active: 5
       max-wait: 60000