MySQL stored procedures show infinite level classification query, query levels son son, pay attention to is to use the process is not a function,

Demand is probably:

Classification a classification table, have a primary key id, name, another for storing the superclass primary key id column, trouble great god are able to write a process, not to function,

CodePudding user response:

Java related

CodePudding user response:

https://www.cnblogs.com/xiaoxi/p/5942805.html