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02.15.2008 at 10:45PM PST, ID: 23168045

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7.6

Handle foreign key violation sqlexception 547

Zones: .NET, Databases Miscellaneous

Tags: C# or VB.NET

Hi. When you delete a record that is being referenced by other tables, you will have a foreign key violation. The following code which is extracted from my project handles the error. I've got the following comments from my friend: "Probably the best bet is to create an enum for holding it, it doesn't look like there is an existing enum in the .NET dlls (probably because SqlException could be raised against any source DB (e.g. Oracle) and the error number is database provider specific)."

Question 1: Is the code the right solution?
Question 2: If not, could you provide the right solution?
Question 3: Is the error number 547 database provider specific?

         
           
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             Protected Sub gvCompetencies_OnRowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
 
 
Dim TrainingCompetencyId As Integer = Convert.ToInt32(gvCompetencies.DataKeys(e.RowIndex).Value)
 
Try
 
TrainingCompetencyElementDAL.Instance.DeleteByTrainingCompetencyID(TrainingCompetencyId)
 
TrainingCompetency_EventTypesDAL.Instance.DeleteByTrainingCompetencyID(TrainingCompetencyId)
 
TrainingCompetencyDAL.Instance.Delete(TrainingCompetencyId)
 
bind()
 
Catch ex As System.Data.SqlClient.SqlException
 
If ex.Number = 547 Then 'handle foreign key violation(547)
 
Dim comp As TrainingCompetency = TrainingCompetencyDAL.Instance.GetTrainingCompetency(TrainingCompetencyId)
 
lblMsg.Text = comp.Name + " cannot be deleted as it is being used by other tables."
 
lblMsg.ForeColor = Drawing.Color.Red
 
End If
 
End Try
 
End Sub

           
         

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Question Stats

Zone: Programming

Question Asked By: fuchangmiao

Solution Provided By: jinesh_kamdar

Participating Experts: 2

Solution Grade: A

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