vb.net数据库源码,vb6数据库开发

VB.NET 怎么调用备份恢复SQL2008 数据库？求源码。。

引用Microsoft SQLDMO Object Library

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

Dim SQLSER As New SQLDMO.SQLServer

SQLSER.Connect(ServerName, UserName, PassWord) '这三项换为你自己的

PBackup.Database = DatabaseName '数据库名

Me.Cursor = System.Windows.Forms.Cursors.WaitCursor

Dim PathName As String

PathName = "D:\BackUp"

PBackup.Files = PathName

PBackup.SQLBackup(SQLSER)

SQLSER.DisConnect()

SQLSER = Nothing

Me.Cursor = System.Windows.Forms.Cursors.Default

MsgBox("成功备份了数据")

End Sub

vb.net数据库操作

参考一下下面这段代码就可以了。

Imports System.Data

'引入数据库操作类命名空间

Imports System.Data.OleDb

'引入ADO.NET操作命名空间

Public Class FrmModifystInfo

Inherits System.Windows.Forms.Form

Public ADOcmd As OleDbDataAdapter

Public ds As DataSet = New DataSet()

'建立DataSet对象

Public mytable As Data.DataTable

'建立表单对象

Public myrow As Data.DataRow

'建立数据行对象

Public rownumber As Integer

'定义一个整型变量来存放当前行数

Public SearchSQL As String

Public cmd As OleDbCommandBuilder

'======================================================

#Region " Windows 窗体设计器生成的代码 "

#End Region

'======================================================

Private Sub FrmModifystInfo_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

'窗体的载入

TxtSID.Enabled = False

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False '设置信息为只读

Dim tablename As String = "student_Info "

SearchSQL = "select * from student_Info "

ExecuteSQL(SearchSQL, tablename) '打开数据库

ShowData() '显示记录

End Sub

Private Sub ShowData()

'在窗口中的textbox中显示数据

myrow = mytable.Rows.Item(rownumber)

TxtSID.Text = myrow.Item(0).ToString

TxtName.Text = myrow.Item(1).ToString

ComboSex.Text = myrow.Item(2).ToString

TxtBornDate.Text = Format(myrow.Item(3), "yyyy-MM-dd ")

TxtClassno.Text = myrow.Item(4).ToString

TxtTel.Text = myrow.Item(5).ToString

TxtRuDate.Text = Format(CDate(myrow.Item(6)), "yyyy-MM-dd ")

TxtAddress.Text = myrow.Item(7).ToString

TxtComment.Text = myrow.Item(8).ToString

End Sub

Private Sub BtFirst_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtFirst.Click

'指向第一条数据

rownumber = 0

ShowData()

End Sub

Private Sub BtPrev_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtPrev.Click

'指向上一条数据

BtNext.Enabled = True

rownumber = rownumber - 1

If rownumber 0 Then

rownumber = 0 '如果到达记录的首部，行号设为零

BtPrev.Enabled = False

End If

ShowData()

End Sub

Private Sub BtNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtNext.Click

'指向上一条数据

BtPrev.Enabled = True

rownumber = rownumber + 1

If rownumber mytable.Rows.Count - 1 Then

rownumber = mytable.Rows.Count - 1 '判断是否到达最后一条数据

BtNext.Enabled = False

End If

ShowData()

End Sub

Private Sub BtLast_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtLast.Click

'指向最后一条数据

rownumber = mytable.Rows.Count - 1

ShowData()

End Sub

Private Sub BtDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtDelete.Click

mytable.Rows.Item(rownumber).Delete() '删除记录

If MsgBox( "确定要删除改记录吗？ ", MsgBoxStyle.OKCancel + vbExclamation, "警告 ") = MsgBoxResult.OK Then

cmd = New OleDbCommandBuilder(ADOcmd)

'使用自动生成的SQL语句

ADOcmd.Update(ds, "student_Info ")

BtNext.PerformClick()

End If

End Sub

Private Sub BtModify_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtModify.Click

TxtSID.Enabled = False '关键字段只读

TxtName.Enabled = True '可读写

ComboSex.Enabled = True

TxtBornDate.Enabled = True

TxtClassno.Enabled = True

TxtRuDate.Enabled = True

TxtTel.Enabled = True

TxtAddress.Enabled = True

TxtComment.Enabled = True

End Sub

Private Sub BtUpdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtUpdate.Click

If Not Testtxt(TxtName.Text) Then

MsgBox( "请输入姓名！ ", vbOKOnly + vbExclamation, "警告 ")

TxtName.Focus()

Exit Sub

End If

If Not Testtxt(ComboSex.Text) Then

MsgBox( "请选择性别！ ", vbOKOnly + vbExclamation, "警告 ")

ComboSex.Focus()

Exit Sub

End If

If Not Testtxt(TxtClassno.Text) Then

MsgBox( "请选择班号！ ", vbOKOnly + vbExclamation, "警告 ")

TxtClassno.Focus()

Exit Sub

End If

If Not Testtxt(TxtTel.Text) Then

MsgBox( "请输入联系电话！ ", vbOKOnly + vbExclamation, "警告 ")

TxtTel.Focus()

Exit Sub

End If

If Not Testtxt(TxtAddress.Text) Then

MsgBox( "请输入家庭住址！ ", vbOKOnly + vbExclamation, "警告 ")

TxtAddress.Focus()

Exit Sub

End If

If Not IsNumeric(Trim(TxtSID.Text)) Then

MsgBox( "请输入数字学号！ ", vbOKOnly + vbExclamation, "警告 ")

Exit Sub

TxtSID.Focus()

End If

If Not IsDate(TxtBornDate.Text) Then

MsgBox( "出生时间应输入日期格式（yyyy-mm-dd）！ ", vbOKOnly + vbExclamation, "警告 ")

Exit Sub

TxtBornDate.Focus()

End If

If Not IsDate(TxtRuDate.Text) Then

MsgBox( "入校时间应输入日期格式（yyyy-mm-dd）！ ", vbOKOnly + vbExclamation, "警告 ")

TxtRuDate.Focus()

Exit Sub

End If

myrow.Item(0) = Trim(TxtSID.Text)

myrow.Item(1) = Trim(TxtName.Text)

myrow.Item(2) = Trim(ComboSex.Text)

myrow.Item(3) = Trim(TxtBornDate.Text)

myrow.Item(4) = Trim(TxtClassno.Text)

myrow.Item(5) = Trim(TxtTel.Text)

myrow.Item(6) = Trim(TxtRuDate.Text)

myrow.Item(7) = Trim(TxtAddress.Text)

myrow.Item(8) = Trim(TxtComment.Text)

mytable.GetChanges()

cmd = New OleDbCommandBuilder(ADOcmd)

'使用自动生成的SQL语句

ADOcmd.Update(ds, "student_Info ")

'对数据库进行更新

MsgBox( "修改学籍信息成功！ ", vbOKOnly + vbExclamation, "警告 ")

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False '重新设置信息为只读

End Sub

Private Sub BtCancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtCancel.Click

TxtSID.Enabled = False

TxtName.Enabled = False

ComboSex.Enabled = False

TxtBornDate.Enabled = False

TxtClassno.Enabled = False

TxtRuDate.Enabled = False

TxtTel.Enabled = False

TxtAddress.Enabled = False

TxtComment.Enabled = False

End Sub

Public Function ExecuteSQL(ByVal SQL As String, ByVal table As String)

Try

'建立ADODataSetCommand对象

'数据库查询函数

ADOcmd = New OleDbDataAdapter(SQL, "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\student.mdb ")

'建立ADODataSetCommand对象

ADOcmd.Fill(ds, table) '取得表单

mytable = ds.Tables.Item(0) '取得名为table的表

rownumber = 0 '设置为第一行

myrow = mytable.Rows.Item(rownumber)

'取得第一行数据

Catch

MsgBox(Err.Description)

End Try

End Function

End Class

求vb.net的源代码，最好说明其解决问题，越多越好，满意加50分。

下面这段代码，是我用来计算每个月存500元进银行，连续30年，最后连本带利能有多少钱。这里面涉及复利计算。界面中右边的文本框用来输出每一次计算的结果。

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

  Dim nianxian As Integer '年限变量

  Dim dingcun As Integer '定存变量

  Dim fuli_big As Long '大复利

  Dim fuli_small As Long '小复利

  Dim i As Integer '循环变量

  Dim DATAstring As String '数据字符串

  nianxian = Val(年限_TextBox.Text)

  dingcun = Val(定存_TextBox.Text)

  DATAstring = ""

  For i = 1 To nianxian

      fuli_small = dingcun * (1 + 0.1875)

      dingcun = fuli_small

      fuli_big = fuli_big + fuli_small

      DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_big) + Chr(13) + Chr(10)

      'DATAstring = DATAstring + "[" + Trim(Str(i)) + "]" + Str(fuli_small) + Chr(13) + Chr(10)

  Next

  'fuli_big = fuli_small

  TextBox1.Text = DATAstring

  结果_TextBox.Text = Str(fuli_big) + "元"

End Sub

VB.net中用SQL语句操作数据库并实时刷新显示在DataGridView中，附源码,求指导

重要的是区别两个方法：DbAdapter.Fill是读，DbCommand.ExecuteNonquery是执行修改。删除按钮下理论上应先调用修改，确认成功后，再调用读取。

求VB.NET2010操作ACCESS数据库的完整代码

Imports System.Data.OleDb

Public Class Parking

Private Sub Parking_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Now_Timer.Enabled = True

End Sub

Private Sub Now_Timer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Now_Timer.Tick

Now_Time_Label.Text = "当前时间：" Date.Now

End Sub

Private Sub Enter_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Enter_Button.Click

'定义一个OLEDB连接字符串

Dim conStr As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=F:\test\test.mdb"

'实例化OLEDB连接

Dim con As OleDbConnection = New OleDbConnection(conStr)

Dim sql As New System.Text.StringBuilder

'定义数据库插入语句

sql.Append("insert into Time_billing([Car_Num],[Enter_Time])")

sql.Append("values('" Trim(Car_Num_Text.Text) "','" Date.Now "')")

'打开数据库链接

con.Open()

'定义执行命令

Dim cmd As New System.Data.OleDb.OleDbCommand(sql.ToString, con)

'执行命令

cmd.ExecuteNonQuery()

'关闭数据库链接

con.Close()

MsgBox("提交成功！")

End Sub

Private Sub Leave_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Leave_Button.Click

Dim Time_Length As Double

Dim Pack_Fee As Double

Dim Enter_time As Date

Dim Leave_time As Date

Dim conStr As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=F:\test\test.mdb"

Dim con As OleDbConnection = New OleDbConnection(conStr)

Dim selSql As New System.Text.StringBuilder

Dim inSql As New System.Text.StringBuilder

Dim upSql As New System.Text.StringBuilder

Dim delSql As New System.Text.StringBuilder

Dim dr As OleDbDataReader

con.Open()

'SQL拼接过程中最后不需要有分号

'在赋值时，读取字段值时必须使用在数据库客户端查询时显示的字段名

selSql.Append("select")

selSql.Append(" Enter_Time")

selSql.Append(" from [Time_billing]")

selSql.Append("where Car_Num = '").Append(Trim(Car_Num_Text.Text)).Append("'")

Dim selcmd As New OleDb.OleDbCommand(selSql.ToString, con)

dr = selcmd.ExecuteReader()

If dr.Read() Then

Enter_time = dr("Enter_Time")

Leave_time = Date.Now

Else

MsgBox("木有数据！")

End If

Enter_Time_Text.Text = Enter_time

Leave_Time_Text.Text = Leave_time

'求时间差

Time_Length = Math.Round(DateDiff(DateInterval.Minute, Enter_time, Leave_time) / 60, 2)

Pack_Fee = Time_Length * 5

Pack_Fee_Text.Text = Pack_Fee

inSql.Append("update [Time_billing]")

inSql.Append(" set [Leave_Time] = '").Append(Trim(Leave_Time_Text.Text)).Append("'")

inSql.Append(" ,[Packing_Fee] = '").Append(Pack_Fee).Append("'")

inSql.Append("where Car_Num = '").Append(Trim(Car_Num_Text.Text)).Append("'")

Dim incom As New OleDb.OleDbCommand(inSql.ToString, con)

incom.ExecuteNonQuery()

'con.Close()

MsgBox("结算完成！")

'con.Open()

upSql.Append("insert into Time_billing_History([Car_Num],[Enter_Time],[Leave_Time],[Packing_Fee])")

upSql.Append(" select")

upSql.Append(" [Car_Num]")

upSql.Append(",[Enter_Time]")

upSql.Append(",[Leave_Time]")

upSql.Append(",[Packing_Fee]")

upSql.Append(" from [Time_billing]")

upSql.Append("where [Car_Num] = '").Append(Trim(Car_Num_Text.Text)).Append("'")

Dim upcom As New OleDb.OleDbCommand(upSql.ToString, con)

upcom.ExecuteNonQuery()

delSql.Append("delete")

delSql.Append(" from")

delSql.Append(" [Time_billing]")

delSql.Append(" where [Car_Num] = '").Append(Trim(Car_Num_Text.Text)).Append("'")

Dim delcom As New OleDb.OleDbCommand(delSql.ToString, con)

delcom.ExecuteNonQuery()

con.Close()

End Sub

Private Sub Clear_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Clear_Button.Click

Car_Num_Text.Clear()

Enter_Time_Text.Clear()

Leave_Time_Text.Clear()

Pack_Fee_Text.Clear()

End Sub

End Class

我想把VB.NET连接MYSQL数据库，代码怎么写啊？

和SQL数据库差不多的，下面是我用vb6.0连接本地mysql数据库的连接字符串

"driver={MySQL ODBC 3.51 Driver};server=127.0.0.1;database=mysql;uid=root;pwd=sasa"