Field * doesn't have a default value problem

Preface

Recently developed , Insert data into the table , There is Field * doesn’t have a default value Report errors , The primary key uses String type .

One 、 scene

The watch uses String Type as primary key , Use MybatisPlus When inserting data , The primary key brings data into the database . And then came

as a result of ： The primary key has no default value , The value passed in was not inserted into the database .
Primary key cannot be empty ,String Type cannot auto increment primary key .
If you use a framework , The strategy needs to be well chosen , Change the strategy to input that will do .