EF連接mysql數據庫生成實體模型，出現報錯無法生成模型:“System.Data.StrongTypingException: 表“TableDetails”中列“IsPrimaryKey”的值為 DBNull

出現如下問題 

 

引用：http://stackoverflow.com/questions/33575109/mysql-entity-the-value-for-column-isprimarykey-in-table-tabledetails-is

1. Open Services (services.msc) and restart MySQL57 service. 2. Execute the following commands in MySQL. use <<database name>>; set global optimizer_switch='derived_merge=OFF'; 3. Update the .edmx.

步驟為：

1、重啟mysql服務

2、登錄mysql數據庫

use mytestdb;
set global optimizer_switch='derived_merge=OFF';

這樣就可以了