The result of my sql-query is a single value i want display that in a lable but dont know how. I have a solution creating a dataset put the result of the query into that dataset and get it by row(0),column(0) but i guess there is a smarter way doing it.
Private myquery As String
Sub New(ByVal query As String)
myquery = query
End Sub
Public Sub query_Send()
Dim myconn As New SqlConnection("Data Source=DB;Integrated Security=TRUE")
Dim mycmd As SqlCommand = New SqlCommand(Me.myQuery, myconn)
Dim myTable As New DataTable
Dim previousConnectionState As ConnectionState = myconn.State
Try
If myconn.State = ConnectionState.Closed Then
myconn.Open()
Dim myDA As New SqlDataAdapter(mycmd)
myDA.Fill(myTable)
tb.text = **...**
End If
If previousConnectionState = ConnectionState.Closed Then
myconn.Close()
End If
End Try
End Sub
You can use SqlCommand.ExecuteScalar Method
Dim querystr as String = "select value from MyTable where ID=5"
Dim mycmd As New SqlCommand(querystr, connection)
dim value as Object = mycmd.ExecuteScalar()
The value
you can put to your textbox. ExecuteScalar returns first value of first row of the resultset (equivalent of row(0).column(0)
) When no record is returned the value
is nothing
.