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Public Const dbconn = "Provider=Microsoft.Jet.OLEDB.4.0; User ID=Admin;Data Source=C:\dbnotes.mdb"
Public mainado As New clsado
mainado.strconn = dbconn
mainado.strsql = "SELECT * FROM tblnotes ORDER BY fldid"
mainado.strtable = "tblnotes"
mainado.Query()
ZMain_Load(mainado.ReturnedDR)
Public Sub ZMain_Load(ByVal DR As DataRow)
Try
If DR.IsNull("fldid") = False Then
frmMain.lblid.Text = CStr(DR("fldid"))
Else
frmMain.lblid.Text = ""
End If
Catch
'other code here
End Try
End Sub
***********************
Option Explicit On
Option Strict On
Imports System.Data.OleDb
Public Class clsado
'/////////////////////////////////////////
'// Written By: Jared Bossart
'// Written For: Newbies whom want a simple connection to an access database
'// Contact Me: cis1130_327@yahoo.com
'// Permissions: This is for educational use only.
'// If used in a professional project please notify me of its use
'// and I'll be more then happy to give you any updated versions.
'// Additional information: This class converts the code of ado.net to the feel
'// of ado for easier learning.
'/////////////////////////////////////////
Private conn As New System.Data.OleDb.OleDbConnection
Private pDA As New System.Data.OleDb.OleDbDataAdapter 'property
Private pDT As New DataTable 'property
Private pDS As New DataSet 'property
Private pstrsql As String 'property
Private pstrtable As String 'property
Private pstrconn As String 'property
Private pPosition As Integer 'property
ReadOnly Property ReturnedDR() As DataRow 'Works like a recordset
Get
Return pDT.Rows(pPosition)
End Get
End Property
ReadOnly Property Position() As Integer 'Returns the index of the row within the datatable/dataset
Get
Return pPosition
End Get
End Property
Property DT() As DataTable
Get
Return pDT
End Get
Set(ByVal Value As DataTable)
pDT = Value
End Set
End Property
Property strconn() As String 'the connection string
Get
Return pstrconn
End Get
Set(ByVal Value As String)
pstrconn = Value
End Set
End Property
Property strsql() As String 'the sql select querty to be executed
Get
Return pstrsql
End Get
Set(ByVal Value As String)
pstrsql = Value
End Set
End Property
Property strtable() As String 'the table name
Get
Return pstrtable
End Get
Set(ByVal Value As String)
pstrtable = Value
End Set
End Property
Public Sub New()
pDA = New OleDbDataAdapter
pDS = New DataSet
End Sub
Public Sub Query()
'Dim myCommand As OleDbCommandBuilder
conn.ConnectionString = pstrconn
Try
pDA = New OleDbDataAdapter(pstrsql, conn)
pDA.Fill(pDS, pstrtable)
pDT = pDS.Tables(pstrtable)
Catch
Console.WriteLine("Error Opening {0}", conn.DataSource)
End Try
'myCommand = New OleDbCommandBuilder(pDA)
End Sub
Public Sub Insert(ByVal newrow As DataRow)
pDT.Rows.Add(newrow)
pDA.Update(pDS, pstrtable)
pDS.Tables(pstrtable).AcceptChanges()
End Sub
Public Sub Update()
Dim newDataSet As DataSet
newDataSet = pDS.GetChanges()
pDA.Update(newDataSet, pstrtable)
pDS.Tables(pstrtable).AcceptChanges()
End Sub
Public Sub Delete(ByVal id As Integer)
DT.Rows(id).Delete()
pDA.Update(pDS, pstrtable)
pDS.Tables(pstrtable).AcceptChanges()
End Sub
Public Sub MoveNext()
pPosition += 1
If pPosition >= pDT.Rows.Count Then
Me.MoveFirst()
Exit Sub
End If
End Sub
Public Sub MovePrevious()
pPosition -= 1
If pPosition < 0 Then
Me.MoveLast()
Exit Sub
End If
End Sub
Public Sub MoveFirst()
pPosition = 0
End Sub
Public Sub MoveLast()
pPosition = (pDT.Rows.Count - 1)
End Sub
Public Function Search(ByVal strsearch As String) As DataRow
'returns the first record found and converts from
'a two dimensional array to a one dimensional array
Dim foundRows As DataRow()
foundRows = pDT.Select(strsearch)
If foundRows.Length <> 0 Then
Dim DR2 As DataRow = pDT.Rows(0)
Dim cntx As Integer
'converts from a datarow array
For cntx = 0 To (foundRows(0).ItemArray.Length - 1)
DR2.Item(cntx) = foundRows(0).Item(cntx)
Next
Return DR2
Else
Return Nothing
End If
End Function
End Class
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