database.vb

这是我用VB和SQL制作的教材购销系统,希望大家提出宝贵意见.

Imports System
Imports System.Data
Imports System.Drawing
Imports System.Data.OleDb
Module database1
    Public StartPath As String = Application.StartupPath & "\aaa.mdb"
    Public ConnStr As String = "Provider=Microsoft.Jet.OLEDB.4.0; "
    Public ConnectStr As String = ConnStr & "Data Source=" & StartPath
    Public DataAdapter As OleDbDataAdapter
    Public DataConnection As OleDbConnection
    Public DataSet As DataSet

    Public Function GetDataFromDB(ByVal sqlstr As String) As DataSet
        Try
            DataConnection = New OleDbConnection
            DataConnection.ConnectionString = ConnectStr
            DataAdapter = New OleDbDataAdapter(sqlstr, DataConnection)
            DataSet = New DataSet
            DataSet.Clear()
            DataAdapter.Fill(DataSet)
            DataConnection.Close()
        Catch
            MsgBox(Err.Description)
        End Try
        If DataSet.Tables(0).Rows.Count > 0 Then
            Return DataSet
        Else
            Return Nothing
        End If
    End Function

    Public Function UpdateDataBase(ByVal sqlstr As String) As Boolean
        Dim sqlconn As New OleDbConnection(ConnectStr)
        Try
            Dim cmdTable As OleDbCommand = New OleDbCommand(sqlstr, sqlconn)
            cmdTable.CommandType = CommandType.Text
            sqlconn.Open()
            cmdTable.ExecuteNonQuery()
            sqlconn.Close()
        Catch
            MessageBox.Show(Err.Description)
            Return False
        End Try
        Return True
    End Function

End Module