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】

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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

vb.net 写数据库

你这是向sql后台数据库写数据吗?

sqldataadapter1.update 改须指定有效的updatecommand,我一直没有看到

给你个例子你看吧:

'首先指定有效的UpdateCommand

sqlstr = "insert into Playlist(PlayName,PlayPath)values('" TextBox4.Text.Trim "','" TextBox5.Text.Trim "')"

Module1.Mycommand.CommandText = sqlstr

'增加新一行(此行必须,要不不能与后台同步,并且后面调用update会出错)

Module1.MyDataSet.Tables("Music").Rows.Add()

Module1.MyDataAdaPter.InsertCommand = Module1.Mycommand

Module1.MyDataAdaPter.Update(Module1.MyDataSet, "Music")

MsgBox("增加数据成功！！")

vb.net+数据库编程问题

使用OleDb将数据库绑定datagridview，然后添加RowHeaderMouseClick事件，在此事件中定义选中某一行后在textbox中显示相应的数据，在添加的按钮中定义打开form2，用sql语句查询数据库得到想要的关键字所关联的数据，显示出来就可以了。这里我给你一部分我写过的代码，基本上和你的要求很像，但是不完全一样，你自己研究研究，改改应该就可以了。

'datagridview绑定数据库

Public Class form1

Private ObjetConnection As OleDbConnection

Private ObjetCommand As OleDbCommand

Private ObjetDataAdapter As OleDbDataAdapter

Private ObjetSet As New DataSet()

' SQL语句

Private strSql As String

Private ObjetDataTable As DataTable

Private ObjetDataRow As DataRow

Private Numeroligne As Integer

'定义路径

Private strConn As String

Private ObjetCommandBuilder As OleDbCommandBuilder

Dim dv As New DataView

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

strConn =

"Provider=Microsoft.ACE.OLEDB.12.0; Data source=" Application.StartupPath "\文件名.accdb" /此处文件路径

strSql =

"Select * 表名 "

ObjetConnection =

New OleDbConnection()

ObjetConnection.ConnectionString = strConn

ObjetConnection.Open()

ObjetCommand =

New OleDbCommand(strSql)

ObjetDataAdapter =

New OleDbDataAdapter(ObjetCommand)

ObjetCommand.Connection() = ObjetConnection

ObjetDataAdapter.Fill(ObjetSet,

"表明")

dv.Table = ObjetSet.Tables(

"表名")

DataGridView1.DataSource = dv

　

ObjetConnection.Close()

End Sub

/此处是RowHeaderMouseclick事件

Private Sub DataGridView1_RowHeaderMouseClick(sender As Object, e As DataGridViewCellMouseEventArgs) Handles DataGridView1.RowHeaderMouseClick

此处添加显示表中相应信息

Me.TextBox1.text = DataGridView1.SelectedRows(0).Cells(0).Value

Me.TextBox2.text = DataGridView1.SelectedRows(0).Cells(1).Value

.........

End Sub

使用VB.net实现sql数据库的备份与恢复代码

Private Sub Button _Click(ByVal sender As System Object ByVal e As System EventArgs) Handles Button Click 备份数据库 BACKUP DATABASE Test TO DISK= C:\Backup WITH Format Dim cn As SqlConnection Dim cm As SqlCommand cn = getDB() cm = New SqlCommand( BACKUP DATABASE JXbase TO DISK= C:\Backup WITH Format cn) cn Open() cm ExecuteNonQuery() MsgBox( 备份成功 ) cn Close()

End Sub

恢复 Private Sub Button _Click(ByVal sender As System Object ByVal e As System EventArgs) Handles Button Click Dim cn As New SqlConnection Dim cn As New SqlConnection Dim mydr As SqlDataReader Dim str As String

Dim tmpConnectionString As String = Data Source=JJK;Initial Catalog=master;Integrated Security=True cn ConnectionString = tmpConnectionString cn ConnectionString = tmpConnectionString cn Open() cn Open() Dim cm As SqlCommand = New SqlCommand( select spid from master sysprocesses where dbid=db_id( JXbase ) cn) mydr = cm ExecuteReader()

Dim cm As SqlCommand = New SqlCommand() cm Connection = cn

While (mydr Read()) 杀死进程

str = kill mydr( spid ) ToString() cm CommandText = str cm CommandType = CommandType Text Application DoEvents() cm ExecuteNonQuery() 杀进程 End While mydr Close() cm = New SqlCommand( RESTORE DATABASE JXbase FROM DISK= C:\Backup cn) 恢复备份 cm ExecuteNonQuery() MsgBox( 恢复成功成功 ) cn Close() cn Close()

lishixinzhi/Article/program/net/201311/12901

vb.net 创建ACCESS数据库。大神给点代码，学习学习。

这也是我研究很长时间的成果，差不多分得给我吧。\(^o^)/~

Imports System.Data

Public Class Form1

Public dt As New DataTable

Public dr As DataRow

'内存表格及界面表格初始化，分类列表框初始化

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Me.SetDesktopBounds(283, 84, 800, 600)

With dt

.Clear()

.Columns.Add("ID")

.Columns.Add("故障描述")

.Columns.Add("原因分析")

.Columns.Add("排除办法")

.Columns.Add("备注")

.Columns.Add("时间")

End With

With Me.DataGridView1

.DataSource = dt

.Columns(0).Width = 30

.Columns(1).Width = 120

.Columns(2).Width = 150

.Columns(3).Width = 190

.Columns(4).Width = 65

.Columns(5).Width = 150

End With

With TS_ComboBox1

.Items.Clear()

.Items.Add("电气")

.Items.Add("机械")

.Items.Add("操作")

End With

End Sub

'将表格中的数据显示到文本框中

Private Sub DataGridView1_CellMouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles DataGridView1.CellMouseClick

If Not IsDBNull(DataGridView1.CurrentRow.Cells(1).Value) Then

RichTextBox1.Text = DataGridView1.CurrentRow.Cells(1).Value

End If

If Not IsDBNull(DataGridView1.CurrentRow.Cells(2).Value) Then

RichTextBox2.Text = DataGridView1.CurrentRow.Cells(2).Value

End If

If Not IsDBNull(DataGridView1.CurrentRow.Cells(3).Value) Then

RichTextBox3.Text = DataGridView1.CurrentRow.Cells(3).Value

End If

If Not IsDBNull(DataGridView1.CurrentRow.Cells(4).Value) Then

RichTextBox4.Text = DataGridView1.CurrentRow.Cells(4).Value

End If

End Sub

Private Sub MenuItem5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem5.Click

Dim str

str = MsgBox("您确定要退出系统吗？", vbOKCancel + vbQuestion, "系统提示")

If str = vbOK Then

End

End If

End Sub

'查看所有记录

Private Sub MenuItem2_1_1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2_1_1.Click

Dim strsql

Dim rs As OleDb.OleDbDataReader

strsql = "select * from Fault_Analyse order by ID"

transactsql(strsql)

rs = oledbcmd.ExecuteReader

dt.Clear()

Do Until Not rs.Read() '在这里作为条件的同时，也执行了该语句

dr = dt.NewRow

dr.Item(0) = rs.Item(0)

dr.Item(1) = rs.Item(2)

dr.Item(2) = rs.Item(3)

dr.Item(3) = rs.Item(4)

dr.Item(4) = rs.Item(5)

dr.Item(5) = rs.Item(1)

dt.Rows.Add(dr)

Loop

DataGridView1.Refresh()

oledbcmd.Dispose() '释放后不能读值

dbconnection.Close()

dbconnection.Dispose()

End Sub

'工具栏隐藏与显示操作

Private Sub MenuItem3_1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem3_1.Click

If Me.MenuItem3_1.Checked = True Then

Me.MenuItem3_1.Checked = False

Else

Me.MenuItem3_1.Checked = True

End If

If Me.MenuItem3_1.Checked = True Then

ToolStrip1.Visible = True

Else

ToolStrip1.Visible = False

End If

End Sub

'往Access数据库中插入新行

Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click

Dim strsql As Object

Dim rs As OleDb.OleDbDataReader

Dim datetime As Date

Dim describe_fault, analyse_reason, solution, remarks As String

Dim class_g1, class_g2 As String

Dim i, j As Integer

i = 0 '初始化

describe_fault = RichTextBox1.Text

analyse_reason = RichTextBox2.Text

solution = RichTextBox3.Text

remarks = RichTextBox4.Text

class_g1 = TS_ComboBox1.Text

class_g2 = TS_ComboBox2.Text

datetime = Now

'注意格式

strsql = "select ID from Fault_Analyse" 'where ID =" + ID + ""

transactsql(strsql)

rs = oledbcmd.ExecuteReader

Do Until Not rs.Read() '获取记录的行数

i = i + 1

Loop

If i = 0 Then i = 1

For j = 1 To i '查询表中是否有ID为j的记录，没有记录则定义新行j

strsql = "select ID from Fault_Analyse where ID =" + CStr(j) + ""

transactsql(strsql)

rs = oledbcmd.ExecuteReader

If Not rs.Read() Then

Num1.Value = CInt(j)

Exit For

End If

Next

If TS_ComboBox1.Text "" And TS_ComboBox2.Text "" Then

strsql = "Insert into Fault_Analyse values('" + CStr(j) + "','" + datetime + " ','" _

+ describe_fault + " ','" + analyse_reason + " ','" + solution + " ','" _

+ remarks + "','" + class_g1 + "','" + class_g2 + "','0')"

transactsql(strsql)

oledbcmd.Dispose() '释放后不能读值

dbconnection.Close()

dbconnection.Dispose()

Else

MsgBox("请为输入的内容分类。", vbOK + vbInformation, "系统提示")

End If

End Sub

'从数据库中删除选中行

Private Sub ToolStripButton3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton3.Click

Dim strsql

Dim str

str = MsgBox("确定要删除- " + CStr(RichTextBox1.Text) + " -的内容吗？", vbOKCancel + vbQuestion, "系统提示")

If str = vbOK Then

strsql = "delete from Fault_Analyse where describe_fault='" + CStr(RichTextBox1.Text) + "'"

transactsql(strsql)

oledbcmd.Dispose() '释放后不能读值

dbconnection.Close()

dbconnection.Dispose()

End If

End Sub

'按照分类查询数据库中指定内容

Private Sub ToolStripButton4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton4.Click

Dim strsql

Dim rs As OleDb.OleDbDataReader

If TS_ComboBox1.Text = "" Or TS_ComboBox2.Text = "" Then

MsgBox("请选择您要查询的类别", vbOKCancel + vbInformation, "系统提示")

Else

strsql = "select * from Fault_Analyse where class_g1='" _

+ TS_ComboBox1.Text + "'and class_g2='" + TS_ComboBox2.Text + "' order by ID"

transactsql(strsql)

rs = oledbcmd.ExecuteReader

dt.Clear()

Do Until Not rs.Read() '在这里作为条件的同时，也执行了该语句

dr = dt.NewRow

dr.Item(0) = rs.Item(0)

dr.Item(1) = rs.Item(2)

dr.Item(2) = rs.Item(3)

dr.Item(3) = rs.Item(4)

dr.Item(4) = rs.Item(5)

dr.Item(5) = rs.Item(1)

dt.Rows.Add(dr)

Loop

DataGridView1.Refresh()

oledbcmd.Dispose() '释放后不能读值

dbconnection.Close()

dbconnection.Dispose()

End If

End Sub

'界面文本框内容清空

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

Dim str

str = MsgBox("确定要清空文本框中内容吗？", vbOKCancel + vbQuestion, "系统提示")

If str = vbOK Then

RichTextBox1.Text = " "

RichTextBox2.Text = " "

RichTextBox3.Text = " "

RichTextBox4.Text = " "

End If

End Sub

'分类选择列表框的定义

Private Sub TS_ComboBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TS_ComboBox1.TextChanged

TS_ComboBox2.Text = ""

If TS_ComboBox1.Text = "电气" Then

With TS_ComboBox2.Items

.Clear()

.Add("程序")

.Add("设备")

.Add("方案")

.Add("工艺")

.Add("其它")

End With

ElseIf TS_ComboBox1.Text = "机械" Then

With TS_ComboBox2.Items

.Clear()

.Add("设计")

.Add("质量")

.Add("故障")

.Add("其它")

End With

ElseIf TS_ComboBox2.Text = "操作" Then

With TS_ComboBox2.Items

.Add("熟练度")

.Add("方案")

.Add("其它")

End With

End If

End Sub

'工具栏的显示与隐藏

Private Sub ToolStripButton5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton5.Click

MenuItem3_1.Checked = False

ToolStrip1.Visible = False

End Sub

End Class

VB.Net数据库编程的问题

你的这个只写删除datagrid表格里的数据啦...跟本就没有写删除数据库的.也没有更新数据库的.

以下是删除按钮的代码..

If MsgBox("数据删除不可恢复，确认删除数据么？", vbYesNo) = vbYes Then

rec.Delete

rec.MoveNext

rec.Requery

End If

以下是form窗体的datagrid显示数据表的代码:

If rec.State = adStateOpen Then rec.Close

SQL = "select * from jbxx" '定义sql查询语句

rec.Open SQL, con, adOpenStatic, adLockOptimistic '打开记录集

Set dg.DataSource = rec '用datagrid控件显示记录集

以下是模块..

Public con As New Connection '定义数据连接，公共变量

Public coon, coom As String

Sub Main()

ChDir App.Path '转换相对路径

con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=cq.mdb;Persist Security Info=False"

'定义数据库连接

con.CursorLocation = adUseClient '以客户端的方式打开

con.Open ' 打开连接

登陆.Show

End Sub

希望能帮到你...

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