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Murray Brown
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VB.net Check if a column exists in a SQL Table

Hi
What VB.net code would I use to check if a column exists in a SQL table?
Thanks
Visual Basic.NETMicrosoft SQL Server

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Murray Brown

8/22/2022 - Mon
Pratik Makwana

This function is check if column is exist or not.....

Dim oField ' As ADODB.Field
      Dim oRecordset ' As ADODB.Recordset
      Dim oConn ' As ADODB.Connection
      Dim nameToCheck
      Dim nameExists
      
      ' The column name you're looking for
      nameToCheck = "ID"
      nameExists = false
      
      ' Create connection
      Set oConn = Server.CreateObject("ADODB.Connection")
      oConn.Open "YourConnectionString"
      
      Set oRecordset = oConn.Execute("SELECT * FROM YourTable")
      
      For Each oField In oRecordset.Fields
            If oField.Name = nameToCheck Then
                  nameExists = True
                  Exit For
            End If
      Next
      
      oRecordset.Close()
      oConn.Close()
      Set oConn = Nothing
      Set oRecordset = Nothing
      
      Response.Write("Field " & nameToCheck & " found: " & nameExists)
ASKER CERTIFIED SOLUTION
Éric Moreau

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OriNetworks

I think Eric has the best answer here where t.name is the table name you are checking and C.name is the column name you are checking for. If the column exists, it will return one row. If it does not exist, no rows will be returned.
Ark

    Public Shared Function ColumnExists(ByVal tableName As String,
                                        ByVal columnName As String,
                                        ByVal conn As SqlClient.SqlConnection) As Boolean
        Dim strSQL As String = "SELECT COUNT(*) FROM information_schema.columns " & _
                               "WHERE table_schema = 'dbo' " & _
                               "AND table_name = '" & tableName & "'" & _
                               "AND column_name = '" & columnName & "';"
        Using cmd As New SqlClient.SqlCommand(strSQL, conn)
            Return CBool(cmd.ExecuteScalar)
        End Using
    End Function

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Dim bExists As Boolean
Using conn As New SqlClent.SqlConnection(YourConnectionStringHere)
    conn.Open()
    bExists = ColumnExists(YourTableName, YourColumnName, conn)
    conn.Close()
End Using

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Murray Brown

ASKER
Thanks