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VB Delete records from mdb tables

Posted on 2012-03-13
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Last Modified: 2012-03-14
I am trying to delete data containted in two tables within my windows application using vb. Here is the code I have so far...

Dim DBName As String = "Time & Pay.mdb"
        Dim conn As New System.Data.OleDb.OleDbConnection()
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & GetPath() & "\" & DBName
        If System.IO.File.Exists(DBName) Then
            If conn.State = ConnectionState.Closed Then
                conn.Open()
            End If
            conn.BeginTransaction()
            Dim strDelete As String = "DELETE * FROM Hours"
            conn.ExecuteNonQuery()
            strDelete = "DELETE * FROM Tips"
            conn.ExecuteNonQuery()
        End If
        Return True
0
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Question by:rawilken
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5 Comments
 

Author Comment

by:rawilken
ID: 37718501
I did some homework and came up with this...

    Public Function DeleteData() As Boolean
        Dim DBName As String = "Time & Pay.mdb"
        Dim conn As New System.Data.OleDb.OleDbConnection()
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & GetPath() & "\" & DBName
        If System.IO.File.Exists(DBName) Then
            If conn.State = ConnectionState.Closed Then
                conn.Open()
            End If
            Dim myCommand As New OleDb.OleDbCommand("DELETE * FROM Hours", conn)
            myCommand.ExecuteNonQuery()
            Dim myCommand1 As New OleDb.OleDbCommand("DELETE * FROM Tips", conn)
            myCommand1.ExecuteNonQuery()
        End If
        Return True
    End Function
0
 
LVL 6

Accepted Solution

by:
Peter Kiprop earned 500 total points
ID: 37718516
Hi rawilken,

Please try the below code

Public Function DeleteData() As Boolean
        Dim DBName As String = "Time & Pay.mdb"
        Dim conn As New System.Data.OleDb.OleDbConnection()
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & GetPath() & "\" & DBName
        If System.IO.File.Exists(DBName) Then
            If conn.State = ConnectionState.Closed Then
                conn.Open()
            End If
            Dim myCommand As New OleDb.OleDbCommand("DELETE  FROM Hours", conn)
            myCommand.ExecuteNonQuery()
            Dim myCommand1 As New OleDb.OleDbCommand("DELETE  FROM Tips", conn)
            myCommand1.ExecuteNonQuery()
        End If
        Return True
    End Function

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0
 

Author Comment

by:rawilken
ID: 37721273
The code throws an error...

ERROR: Unable to cast object of type 'System.String' to type 'System.IO.StreamWriter'. at tw=)GetPath)_ & csv)

Dim DBName As String = "Time & Pay.mdb"
        Dim conn As New System.Data.OleDb.OleDbConnection()
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & GetPath() & "\" & DBName
        conn.Open()
        Dim csv As String = "\Paryoll.csv"
        Dim tw As StreamWriter
        tw = (GetPath() & csv)
        Dim sql = strExport
        Dim consql As New OleDb.OleDbCommand
        consql.CommandText = sql
        consql.Connection = conn
        Dim datRead As OleDb.OleDbDataReader
        datRead = consql.ExecuteReader
        Do Until datRead.Read = False
            tw.WriteLine(datRead.GetString(0) & " , " & datRead.GetString(1) & " , " & datRead.GetString(2) & _
                         " , " & datRead.GetDouble(3) & " , " & datRead.GetString(4) & " , " & datRead.GetDouble(5))
        Loop
        tw.Close()
        conn.Close()
        Return True
0
 

Author Comment

by:rawilken
ID: 37721700
The delete does not work. There are no error. It just does not delete the data?

Here is the code...

Public Function DeleteData() As Boolean
        Dim DBName As String = "Time & Pay.mdb"
        Dim conn As New System.Data.OleDb.OleDbConnection()
        conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & GetPath() & "\" & DBName
        If System.IO.File.Exists(DBName) Then
            If conn.State = ConnectionState.Closed Then
                conn.Open()
            End If
            Dim myCommand As New OleDb.OleDbCommand("DELETE FROM Hours", conn)
            myCommand.ExecuteNonQuery()
            Dim myCommand1 As New OleDb.OleDbCommand("DELETE FROM Tips", conn)
            myCommand1.ExecuteNonQuery()
        End If
        conn.Close()
        Return True
    End Function
0
 

Author Closing Comment

by:rawilken
ID: 37722540
not completely resolved
0

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