有时会遇到一个springboot工程数据库连接断掉的情况。为避免该问题发生，我们可以加上数据库连接池检查。

解决方案

• 加一个autoReconnection属性 ( 不推荐这种方法了 )

  spring.datasource.url = jdbc:mysql://localhost:3306/xxx?characterEncoding=UTF-8&autoReconnect=true
  

  The use of this feature is not recommended, because it has side effects related to session state and
  data consistency when applications don't handle SQLExceptions properly, and is only designed to be used
  when you are unable to configure your application to handle SQLExceptions resulting from dead and 
  stale connections properly.
  

• 加上空闲检查配置

  spring.datasource.tomcat.test-while-idle=true
  spring.datasource.tomcat.test-on-borrow=true 
  spring.datasource.tomcat.validation-query=SELECT 1
  

• 属性说明

connection.png