Posts Tagged database error
Unable to update the EntitySet ‘yourTableName’ because it has a DefiningQuery and no element exists in the element to support the current operation.
Recently i am switching to MVC4 with Razor view engine for ASP.NET, C# web application. Tomorrow i was developing a blogging site where there were some works related to database. There i have created a table with 4 columns but none of them were made primary key.
When i tried to run the application the visual studio 2012 shows the error “Unable to update the EntitySet ‘UserTable’ because it has a DefiningQuery and no <InsertFunction> element exists in the <ModificationFunctionMapping> element to support the current operation.” Here UserTable was my table name.
The database was sql server compact edition of visual studio 2012. I became confused about the error because this type of table with no primary key works well before. After a while i came to know that the problem was because of the lacking of primary key in the table. when i mark one of the columns as a primary key then the project run without error. This type of error was new to me so i thought to write down here so later on it may be helpful to someone like me.
Summary of the error and solution:
Problem: No primary key in the table
Solution: Add a primary key in the table
Bikash, Software Engineer.