EF6 add MySQL edmx entity times error: Unable to generate model: "System.Data.StrongTypingException: The Value of column" IsPrimaryKey "in Table" Tabledetails "is DBNull

EF6.1.3, when using the mysql5.7 Entity Data model, Tip:

The model could not be generated because of the following exception: "System.Data.StrongTypingException: The Value of column" IsPrimaryKey "in Table" Tabledetails "is DBNull

The solutions on the Internet are:

1. 运行services.msc，重启MySQL服务.

2. mysql Run command:  use Mydbname; set global optimizer_switch< Span class= "pun" >= ' Derived_merge=off ' ;        

 3. regenerate  Span class= "pun". EDMX 
 
 Additionally, you need to configure the MySQL service to be a local account only           

Specific Command reference: https://stackoverflow.com/questions/33575109/ Mysql-entity-the-value-for-column-isprimarykey-in-table-tabledetails-is

EF6 add MySQL edmx entity times error: Unable to generate model: "System.Data.StrongTypingException: The Value of column" IsPrimaryKey "in Table" Tabledetails "is DBNull