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

这里以OERACLE数据库为例 ：

Provider=MSDAORAdata source =主机名:1521/ORCLUser ID=systemPassword=ORACLEUnicode=True

Dim myConn As Data.OleDb.OleDbConnection

myConn = New System.Data.OleDb.OleDbConnection()

myConn.ConnectionString = strCon

myConn.Open()

可以用ADODB，先定义

Dim cnn

As

New

ADODB.Connection

Dim rs

As

New

ADODB.Recordset

这两个cnn用来连接数据库rs用来读取数据库中的值，然后用循环遍历rs将值ADD到listview里面

修改和保存可以做成同一个按钮保存就是遍历listview将数据UPDATE到数据库里面就行！

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