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MDAC 2.5 SDK - ADO

Seek Method and Index Property Example (VB)


This example uses the Recordset object's Seek method and Index property in conjunction with a given Employee ID, to locate the employee's name in the Employees table of the Nwind.mdb database.

Public Sub Main()
SeekX
End Sub

Public Sub SeekX()
Dim rst As ADODB.Recordset
Dim strID As String
Dim strPrompt As String
strPrompt = "Enter an EmployeeID (e.g., 1 to 9)"

Set rst = New ADODB.Recordset
rst.CursorLocation = adUseServer
rst.Open "employees", _
"Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=c:\temp\northwind.mdb;" & _
"user id=admin;password=;", _
adOpenKeyset, adLockReadOnly, adCmdTableDirect

' Does this provider support Seek and Index?
If rst.Supports(adIndex) And rst.Supports(adSeek) Then
rst.Index = "EmployeeId"
' Display all the employees.
rst.MoveFirst
Do While rst.EOF = False
Debug.Print rst!EmployeeID; ": "; rst!firstname; " "; _
rst!LastName
rst.MoveNext
Loop

' Prompt the user for an EmployeeID between 1 and 9.
rst.MoveFirst
Do
strID = LCase(Trim(InputBox(strPrompt, "Seek Example")))
' Quit if strID is a zero-length string (CANCEL, null, etc.)
If Len(strID) = 0 Then Exit Do
If Len(strID) = 1 And strID >= "1" And strID <= "9" Then
rst.Seek Array(strID), adSeekAfterEQ
If rst.EOF Then
Debug.Print "Employee not found."
Else
Debug.Print strID; ": Employee='"; rst!firstname; " "; _
rst!LastName; "'"
End If
End If
Loop
End If

rst.Close
End Sub