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

数据库：执行查询语句后得到一个Recordset，使用RecordSet.MoveLast属性可以找到最后一条记录。

TXT文件：Open

StrPath

For

Input

As

#1

Do

While

Not

EOF(1)

Line

Input

#1,

TXTCon

i

=

i

+

1

Loop

Close

#1

以上是读取txt文件的方法，当close后i的值就是txt文件的总行数。然后再运行下面的方法

Open

StrPath

For

Input

As

#1

Do

While

Not

EOF(1)

Line

Input

#1,

TXTCon

If

j=

iThen

msgbox

TXTCon

'这个就是最后一行记录

Close

#1

Exit

Sub

End

If

j=

j

+

1

Loop

Close

#1

StrPath

是txt文件的路径+文件名

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