MySql bug (id=79163)

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MySql BUG(https://bugs.mysql.com/bug.php?id=79163):
'System.Data.StrongTypingException: The value for column 'IsPrimaryKey' in table 'TableDetails' is DBNull.
解决方案:
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.
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