Nacos persistent switch configuration

1. Create the nacos_config database in the database.
Execute the sql statement in nacos\conf\nacos-mysql.sql to get these tables

2. Add database connection configuration at the end of application.properties

spring.datasource.platform=mysql

db.num=1
db.url.0=jdbc:mysql://ip:3306/nacos_config?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true
db.user=root
db.password=root

3. Restart nacos