vb如何读取数据库一行数据?

vb如何读取数据库一行数据?,第1张

'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

两种办法,一种是 用SQL,另一种是ADO

1、用SQL添加数据:

insert into 表名(字段1,字段2,字段3)

values(值01,值02,值03)

例如:

docmd.runsql"insert into EmpTable(Name,age,Duty,Salary) values('王明',35,'外贸总监',12500)"

2、用ADO的办法:

ADO比较复杂,给你一个完整的例子吧:

Dim strSqlfitjc As String

strSqlfitjc = "select * from *表"

Set RSfitjc = New ADODB.Recordset ‘定义一个ADO连接,连进数据库

RSfitjc.Open strSqlfitjc, cn, adOpenKeyset, adLockOptimistic ’打开连接

RSfitjc.addnew'添加一个纪录

RSfitjc.Fields("配件编号") = “style” ‘给每个字段赋值

.Update’储存赋值的新纪录

.Close 关闭连接

End With


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原文地址: http://outofmemory.cn/sjk/10863605.html

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