1.cmd

2.c:\Users\Administrator>cd c:\Program Files\MySQL\MySQL Server 5.7\bin

3c:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -h localhost -u root -p

4.Enter password: 数据库密码

5.use  表名;

6.set global optimizer_switch=‘derived_merge=OFF‘;

7.终于成功！

Entity Framework连接MySQL时：由于出现以下异常,无法生成模型:“表“TableDetails”中列“IsPrimaryKey”的值为DBNull.