NetCore MySql The user specified as a definer (‘admin‘@‘%‘) does not exist

        Because the project is developed and used in the local LAN , Sometimes external deployment display is required , So migrate the project to the Internet server , Install mysql（8.x） database 、iis etc. , Publish the server to iis, Import database related data tables 、 View 、 Function structure , Modify project related configuration files , Start the test project , There are some interface prompts in the process of requesting interfaces ：

"message": "The user specified as a definer ('admin'@'%') does not exist"

What the hell is this ？ So I began to find the cause of the problem , Searching for some information means that the permission is insufficient , Check the user permissions ：

Basic permissions are added, deleted, modified, and checked , So open the external network port of the database , Local connection code test , Breakpoint tracking is all right , Some interface calls always prompt ：

The user specified as a definer ('admin'@'%') does not exist

Start looking for reasons in the code , No specific code problem has been found .

        After silence , Is it a database problem , Start printing now sql Execute... In the database , The result database is the same prompt , Start using SELECT Query a single table in the Association , Sure enough, this error is prompted in a view ：

The original definer who created the view was not admin user , Finally found the cause of the problem , Export the view script , Re execute the extranet platform database , Sure enough OK 了 . 

Try to be consistent when creating database users , Avoid this problem , For a long time , Drink a cup of coffee slowly (●'◡'●).