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Editorial Team
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Asked: 2026-05-22T17:58:25+00:00

I am using EF 4.0 , i have one problem Table structure in DB

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I am using EF 4.0 , i have one problem

Table structure in DB is:

Table: Setting--->
                     Name (PK)
                     GroupBy
                     DataType

Table: UserSetting-->
                     SettingName(PK)(FK)
                     UserName(PK)(FK)
                     Value

Table: WorkstationSetting-->
                     SettingName(PK)(FK)
                     WorkstationName(PK)(FK)
                     Value

Now i want to make use of inheritance, because WorkstationSetting and UserSetting inherits settings so any suggestion how to achieve inheritance, i tried but i got error like

"Error  39  Error 3003: Problem in mapping fragments starting at line 1621:All the key properties (Settings.Name) of the EntitySet Settings must be mapped to all the key properties (WorkstationSetting.SettingName, WorkstationSetting.WorkstationName) of table WorkstationSetting.
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1 Answer

  1. Editorial Team

    Look into table per type inheritance. For example look here. It should help you get started. The idea is that you have a table for each concrete type (as you have) and you map it to an object hierarchy.

    Maybe your problem is with the keys. How is your mapping defined? Are the associations between the tables defined in the DB?

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