vb.net代码大全 VBNET编程宝典
vb.net (2010) 连接access数据库及操作代码 （读取 写入 创建新表）【解决后再加50分】
由于 没有VS2010，只能简单写几句代码。用ODBC连接数据比较方便，你首先要引用system.data和system.data.odbc
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dim cn as odbcconnection
cn=new odbcconnection("driver={microsoft access driver (*.mdb)};uid=admin;pwd=;dbq=数据库路径\数据库名.mdb")
dim tsql as string
tsql="select username from [user]"
dim od as odbcdataadapter
dim ds as dataset=new dataset
od=new odbcdataadapter(tsql,cn)
od.fill(ds)
listbox.items.clear
for i=0 to ds.tables(0).rows.count-1
listbox.items.add(ds.tables(0).rows(i),i)
next i
大概是这样的，希望能对你有所帮助。
vb.net 调用数据库某个表中的数据的具体代码
选择客户姓名时
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
'在这里放入取数据库客户ID的代码，现把取得的值给订单号
End Sub
用VB.NET设计一个以秒为基本单位的表，并且显示在窗体上的步骤，并且给出关键代码
是我以前自己设计的用来测试自己点钞速度用的，希望是你需要的
以下是窗体的全部代码
Public Class Form1
Dim StartFlag As Boolean = False
Dim secon As Integer
Dim minut As Integer
'空格
Private Sub Form1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyUp
If e.KeyCode = Keys.Space Then
If StartFlag Then
StartFlag = False
Timer1.Enabled = False
If Val(Strings.Right(Label1.Text, 2)) 10 And Val(Strings.Right(Label1.Text, 2)) = 0 Then secon = 0 : minut = 0 : Label1.Text = "00:00" : Exit Sub
ListBox1.Items.Add(Label1.Text.ToString)
ListBox1.SelectedItem = ListBox1.Items.Count - 1
Label1.Focus()
Button1.Enabled = True
Label1.Text = "00:00"
secon = 0
minut = 0
Else
StartFlag = True
Timer1.Enabled = True
End If
End If
End Sub
'加载
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ListBox1.Items.Clear()
Label1.Text = "00:00"
Button1.Enabled = False
secon = 0
minut = 0
Label1.Focus()
End Sub
'清空
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Button1.Enabled = False
ListBox1.Items.Clear()
Label1.Focus()
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
secon += 1
If secon = 60 Then
secon = 0
minut += 1
End If
Dim seconStr As String = secon
If seconStr.Length = 1 Then seconStr = "0" + seconStr
Dim minutStr As String = minut
If minutStr.Length = 1 Then minutStr = "0" + minutStr
Label1.Text = minutStr + ":" + seconStr
Label1.Focus()
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim SeconSun As Integer
If ListBox1.Items.Count 0 Then
For i = 0 To ListBox1.Items.Count - 1
Dim TemStr As String = ListBox1.Items.Item(i).ToString
Dim TemInt1 As Integer = Val(Strings.Right(TemStr, 2))
Dim TemInt2 As Integer = Val(Strings.Left(TemStr, 2))
Debug.Print(TemInt1.ToString)
Debug.Print(TemInt2.ToString)
SeconSun += TemInt1 + TemInt2 * 60
Debug.Print(SeconSun.ToString)
Next
TextBox1.Text = (SeconSun / ListBox1.Items.Count).ToString + "秒"
End If
Label1.Focus()
End Sub
End Class
用vb.net 怎样建立一个mdb数据库及一张表
首先在项目的VB.NET界面，使用菜单【项目】--【添加引用】--【COM】
选择 Microsoft ADO Ext. 2.x for DDL and Security
然后单击【确定】，完成引用。
完整代码如下：
Imports ADOX
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'创建空的access数据库文件--数据库文件.mdb，密码为123
Dim Mycat As Catalog = New Catalog()
Mycat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Jet OLEDB:Engine Type=5;Data Source= 数据库文件.mdb;Jet OLEDB:Database Password=123")
'以下代码创建一个名为“实验数据表”
Dim MyTable As ADOX.Table = New ADOX.Table '定义新表
MyTable.Name = "实验数据表" '表命名
'给表“实验数据表” 创建一个字符串字段，字段名“姓名”
MyTable.Columns.Append("姓名", , ADOX.DataTypeEnum.adWChar)
'给表“实验数据表” 创建一个整数字段，字段名“学号”
MyTable.Columns.Append("学号", ADOX.DataTypeEnum.adInteger) '追加一个数字型字段
'给字段“学号”创建一个主键“PimaryKey_Field”
MyTable.Keys.Append("学号", ADOX.KeyTypeEnum.adKeyPrimary, "学号")
Mycat.Tables.Append(MyTable) '把所有的新字段追加到表
MyTable = Nothing
Mycat = Nothing
End Sub
End Class
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