vb如何读取数据库一行数据？

'读取方法：

Imports System.IO

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Me.ListBox1.Items.Clear()

Dim StrRed As StreamReader = New StreamReader("D:\111.txt", System.Text.Encoding.Default)

While Not StrRed.EndOfStream

Me.ListBox1.Items.Add(StrRed.ReadLine())

End While

StrRed.Dispose()

End Sub

End Class

'其它读写方法：

写入：

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim strR As New StreamWriter("D:\111.txt", True)'参数True表示 在原来的数据上面添加，如果为False这删除原来的数据 重新写入数据

strR.WriteLine(Me.TextBox2.Text)

strR.Dispose()

End Sub

读取：

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

Dim strR As New StreamReader("D:\111.txt")

While Not strR.EndOfStream

Me.TextBox1.Text += strR.ReadLine() &vbCrLf

End While

strR.Dispose()

End Sub

提取网页中的某些数据用以下代码实现：

Set h = CreateObject("Microsoft.XMLHTTP")

h.Open "GET", "你所要提取信息的网页完整地址", False

h.Send

If h.ReadyState = 4 Then

s = StrConv(h.Responsebody, vbUnicode)

End If

If InStr(s, "本账号已使用时间：") >0 And InStr(s, "分钟") >0 Then

Text1.Text = Split(Split(s, "本账号已使用时间：")(1), "分钟")(0)'提取出来的时间

Else

MsgBox "信息提取失败"

End If

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