springboot使用jpa,删除功能sql报错解决

springboot使用jpa时报错：

 只有删除时报错了，

"data": "删除失败，原因：Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 190,731 milliseconds ago. The last packet sent successfully to the server was 4 milliseconds ago.",
"success": false

解决方案：增加了配置：&failOverReadOnly=false

对应中文环境，通常mysql连接URL可以设置为：
jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=gbk&autoReconnect=true&failOverReadOnly=false

在使用数据库连接池的情况下，最好设置如下两个参数：
autoReconnect=true&failOverReadOnly=false