vb.net数据库实例的简单介绍

求用vb.net写一个读取数据库数据的简单操作。

Option Explicit On

Option Strict On

Imports System

Imports System.Data

Imports System.Data.SqlClient

Public Class Program

Public Shared Sub Main()

Dim connectionString As String = _

"Data Source=(local);Initial Catalog=Northwind;" _

"Integrated Security=true"

' Provide the query string with a parameter placeholder.

Dim queryString As String = _

"SELECT ProductID, UnitPrice, ProductName from dbo.Products " _

"WHERE UnitPrice @pricePoint " _

"ORDER BY UnitPrice DESC;"

' Specify the parameter value.

Dim paramValue As Integer = 5

' Create and open the connection in a using block. This

' ensures that all resources will be closed and disposed

' when the code exits.

Using connection As New SqlConnection(connectionString)

' Create the Command and Parameter objects.

Dim command As New SqlCommand(queryString, connection)

command.Parameters.AddWithValue("@pricePoint", paramValue)

' Open the connection in a try/catch block.

' Create and execute the DataReader, writing the result

' set to the console window.

Try

connection.Open()

Dim dataReader As SqlDataReader = _

command.ExecuteReader()

Do While dataReader.Read()

Console.WriteLine( _

vbTab "{0}" vbTab "{1}" vbTab "{2}", _

dataReader(0), dataReader(1), dataReader(2))

Loop

dataReader.Close()

Catch ex As Exception

Console.WriteLine(ex.Message)

End Try

Console.ReadLine()

End Using

End Sub

End Class

这是我在vs2010中微软自带的MSDN示例代码里面拷的，是关于ADO.net连接sql的操作。

希望对你有帮助。 如果你还需要其他的，我也可以再拷给你看。

相关问答

Q1: 请各位大侠给出用VB.NET连接oracle数据库并执行sql查询语句的代码示例，谢谢！！

Dim OraSession As Object '会话对象

Dim OraDatabase As Object '数据库对象

Dim OraDynaset As Object'动态集对象

Dim OraDatabase As Object’字段集对象

Set OraSession =CreateObject("OracleInProcServer.XOraSession")

Set OraDatabase=OraSession.CreateDatabase

("Demo","scott/tiger",0)'建立数据库连接

Set OraDynaset=OraDatabase.CreateDynaset("select*from

student",0)'初始化动态集对象

’添加记录

'Begin an AddNew

OraDynaset.DbAddNew

OraDynaset.Fields("ID").value="1000"

’ID为列名

OraDynaset.DbUpdate'更新数据到表

’删除

OraDynaset.DbDelete

'修改

OraDynaset.DbEdit

OraDynaset.Fields("ID").value="101210"

OraDynaset.DbUpdate

Q2: 如何用VB.NET中的listview显示SQL数据库中的数据？能给我个完整的实例吗？谢谢！

'数据库连接函数,其中mysql(数据集连接语句),sqlip(SQL服务器IP),rsmod(数据库打开模式)为动态取值

Public Function myRs(ByVal mySQL As String, ByVal sqlIP As String, ByVal rsMod As Integer) As ADODB.Recordset

Dim myConn As New ADODB.Connection

If myConn.State = 1 Then

myConn.Close()

End If

If rs.State = 1 Then

rs.Close()

End If

myConn.ConnectionString = "Provider = Sqloledb;SERVER=" sqlIP ";uid=sa;pwd=;database=school"

myConn.Open()

rs.Open(mySQL, myConn, 1, rsMod)

myRs = rs

End Function

'显示列表内容函数,该函数能显示两个子项

Public Function addLst() As Boolean

lstUser.Clear()

mySql = "select * from sqlusers"

rs = myRs(mySql, sqlIP, 1)

lstUser.View = View.Details

Dim i As Integer

If rs.Fields.Count 0 Then

'添加列表框列标题项目

For i = 1 To rs.Fields.Count

lstUser.Columns.Add(rs.Fields.Item(i - 1).Name)

Next

'添加列表框数据内容

If rs.RecordCount 0 Then

rs.MoveFirst()

For i = 1 To rs.RecordCount

lstUser.Items.Add(rs("用户名").Value)

lstUser.Items.Item(i - 1).SubItems.Add(rs("密码").Value)

lstUser.Items.Item(i - 1).SubItems.Add(rs("用户类型").Value)

rs.MoveNext()

Next

End If

End Function

以上是我刚刚写完的,调试通过,希望对你有用.

Q3: 你好！有没有vb.net对SQL数据库进行增删改查的例子

一般都是vb.net传入参数 交给存储过程去做的 你是要在vb.net前台就执行的例子 还是想要调用存储过程的例子

前台的一般就是这样

Dim paras As New NameValueCollection

paras .Append("delete from T_AlarmConfig ")

paras .Append(" where AlarmConfigID=@AlarmConfigID")

调用存储过程的就是给写存储过程了，这是调用存储过程的例子，只能理解理解

''' summary

''' 删除数据

''' /summary

''' param name="procName"存储过程名/param

''' param name="paras"存储过程参数/param

''' remarks

''' 2006-5-29　zhuzh Created

''' /remarks

Public Sub DeleteData(ByVal procName As String, _

ByVal paras As NameValueCollection, _

Optional ByVal timeout As Integer = 30)

eventCount += 1

'存储过程参数名数组

Dim paraNames As String() = {}

'存储过程参数值数组

Dim paraValues As String() = {}

'传入的参数转化成数组

Me.ConvertNameValueCollection(paras, paraNames, paraValues, STATUS_UPDATE)

'判断系统类型调用相应模块的方法

If isWebSys Then

DeleteDelegateInstance = AddressOf webGw.ExecProc

Else

DeleteDelegateInstance = AddressOf AdoGw.ExecProc

End If

Dim ret As Integer = 0

Dim ds As New DataSet

'----guojun 2008-1-2 add-----

If timeout 60000 Then

timeout = 60000

End If

'--------防止超时异常--------

DeleteDelegateInstance.BeginInvoke(procName, ret, ds, paraNames, paraValues, timeout, _

AddressOf DataDeletedCallBack, Nothing)

End Sub

Q4: 求一个用VB.net操作access数据库的例程

Imports System

Imports System.Drawing

Imports System.ComponentModel

Imports System.Windows.Forms

Imports System.Data.OleDb

Imports System.Data

Public Class Form1

Inherits Form

Private components As System.ComponentModel.Container = Nothing

Private WithEvents lastrec As Button

Private WithEvents nextrec As Button

Private WithEvents previousrec As Button

Private WithEvents firstrec As Button

Private t_books As TextBox

Private t_nl As TextBox

Private t_xb As TextBox

Private t_xm As TextBox

Private t_id As TextBox

Private l_books As Label

Private l_nl As Label

Private l_xb As Label

Private l_xm As Label

Private l_id As Label

Private label1 As Label

Private myDataSet As DataSet

Private WithEvents button1 As Button

Private WithEvents button2 As Button

Private WithEvents button3 As Button

Private WithEvents button4 As Button

Private myBind As BindingManagerBase

Public Sub New ( )

MyBase.New ( )

GetConnected ( )

InitializeComponent ( )

End Sub

'清除在程序中使用过的资源

Protected Overloads Overrides Sub Dispose (ByVal disposing As Boolean)

If disposing Then

If Not (components Is Nothing) Then

components.Dispose ( )

End If

End If

MyBase.Dispose ( disposing )

End Sub

Public Sub GetConnected ( )

'创建一个数据连接

Dim strCon As String = " Provider = Microsoft.Jet.OLEDB.4.0 ;

Data Source = db.mdb "

Dim myConn As OleDbConnection = New OleDbConnection ( )

myConn.ConnectionString = strCon

Dim strCom As String = " SELECT * FROM person "

'创建一个 DataSet

myDataSet = New DataSet ( )

myConn.Open ( )

'通过OleDbDataAdapter对象得到一个数据集

Dim myCommand As OleDbDataAdapter = New OleDbDataAdapter

( strCom , myConn )

'把Dataset绑定books数据表

myCommand.Fill ( myDataSet , "person" )

'关闭此数据连接

myConn.Close ( )

End Sub

'插入数据记录操作代码

Private Sub button2_Click (ByVal sender As Object , _

ByVal e As System.EventArgs) Handles button2.Click

'判断所有字段是否添完，添完则执行，反之弹出提示

If ( t_id.Text "" And t_xm.Text ""

And t_xb.Text "" And t_nl.Text ""

And t_books.Text "" ) Then

Dim myConn1 As String = " Provider = Microsoft.Jet.OLEDB.4.0 ;

Data Source = db.mdb"

Dim myConn As OleDbConnection = New OleDbConnection ( myConn1 )

myConn.Open ( )

Dim strInsert As String = " INSERT INTO person ( id , xm , xb , nl

, zip ) VALUES ( " _

t_id.Text + " , '" _

t_xm.Text + "' , '" _

t_xb.Text + "' , " _

t_nl.Text + " , " _

t_books.Text + ")"

Dim inst As OleDbCommand = New OleDbCommand ( strInsert , myConn )

inst.ExecuteNonQuery ( )

myConn.Close ( )

myDataSet.Tables ( "person" ).Rows ( myBind.Position ).BeginEdit ( )

myDataSet.Tables ( "person" ).Rows ( myBind.Position ).EndEdit ( )

myDataSet.Tables ( "person" ).AcceptChanges ( )

Else

MessageBox.Show ( "必须填满所有字段值！" , "错误！" )

End If

End Sub