1.使用文件来记录,下次运行时读取 .2.使用数据库,可以考虑单机数据库或网络数据库 3.如果数据量小,使用注册表. 或者可以通过程序来保存: set fs=createobject("scripting.filesystemobject")'创建文件操作对象 if fs.fileexists("C:\a.txt") then'如果C盘A.txt存在,那么读取其内容 set txt=fs.opentextfile("C:\a.txt",forreading,true) set txtn=txt.readall else' set txtf=fs.createtextfile("c:\a.txt",true)'创建C盘下的a.txt do'无限循环 wscript.sleep 1000'延时一秒 txtf.write a.text'写入文本框中内容 loop'循环结束 end if'判断结束
傲骨
2024-05-14 02:42:58
步骤 1、 先来看一下northwind数据库中employees表结构
2、 知道.net连接sql server的方法嘛,不知道的话,看看我写的“ado.net中的connection对象”吧。读懂下面这几句没问题吧: Dim conn as new sqlconnection(“server=localhost;database=northwind;Integrated Security=true;” Dim sqlcomm As New SqlCommand sqlcomm.Connection = conn sqlcomm.CommandText = "INSERT INTO employees (lastname,firstname,photo) VALUES (@lastname,@firstname,@photo)" Dim prm1 As New SqlParameter("@lastname", txtLN.Text) Dim prm2 As New SqlParameter("@firstname", txtFN.Text) Dim prm3 As New SqlParameter("@photo", SqlDbType.VarBinary, Int(fs.Length), _ ParameterDirection.Input, False, 0, 0, "", DataRowVersion.Current, Data) sqlcomm.Parameters.Add(prm1) sqlcomm.Parameters.Add(prm2) sqlcomm.Parameters.Add(prm3) 3 、新建一个windows应用程序窗体 4、 声明类级的变量。找到设计期产生的代码部分,把下面的语句加到变量声明后面。什么?不知道变量声明在哪儿?不会吧! Private fs As FileStream Private ds As DataSet Private conn As New SqlConnection("server=localhost;database=northwind;integrated security=true;") Private currentpos As Integer = 9 5、 开始写代码了。首先是form_load Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load btnOpen.Enabled = True btnSave.Enabled = True btnBack.Enabled = False btnForward.Enabled = False End Sub 6、 open按钮的点击事件代码: Private Sub openbtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOpen.Click Dim Opendlg As New OpenFileDialog Opendlg.Title = "Select a picture file" Opendlg.Filter = "(*.bmp)|*bmp|(*.jpg)|*.jpg" Opendlg.ShowDialog() lblPath.Text = Opendlg.FileName.ToString() fs = New FileStream(Opendlg.FileName.ToString(), FileMode.Open, FileAccess.Read) PictureBox1.Image = Image.FromFile(Opendlg.FileName.ToString()) End Sub 7、 save按钮的点击事件代码 Private Sub savebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click Dim sqlcomm As New SqlCommand sqlcomm.CommandText = "INSERT INTO employees (lastname,firstname,photo) VALUES (@lastname,@firstname,@photo)" sqlcomm.Connection = conn Dim Data(fs.Length) As Byte fs.Read(Data, 0, Int(fs.Length)) Dim prm1 As New SqlParameter("@lastname", txtLN.Text) Dim prm2 As New SqlParameter("@firstname", txtFN.Text) Dim prm3 As New SqlParameter("@photo", SqlDbType.VarBinary, Int(fs.Length), ParameterDirection.Input, False, 0, 0, "", DataRowVersion.Current, Data) sqlcomm.Parameters.Add(prm1) sqlcomm.Parameters.Add(prm2) sqlcomm.Parameters.Add(prm3) Try conn.Open() sqlcomm.ExecuteNonQuery() '执行插入语句 conn.Close() fs.Close() Catch ex As Exception MsgBox(ex.Message) End Try End Sub 8、 选择view状态的事件代码 Private Sub CheckBox1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged If CheckBox1.Checked = True Then btnOpen.Enabled = False btnSave.Enabled = False btnBack.Enabled = True btnForward.Enabled = True currentpos = 9 Dim sqlcomm As New SqlCommand sqlcomm.CommandText = "SELECT employeeId, photo FROM employees ORDER BY employeeId" sqlcomm.Connection = conn Dim da As New SqlDataAdapter(sqlcomm) Try conn.Open() ds = New DataSet da.Fill(ds, "employees") conn.Close() Catch sqlEx As SqlException MsgBox(sqlEx.Message) End Try Dim data() As Byte = ds.Tables("employees").Rows(9)("photo") Dim stmphoto As New MemoryStream(data) PictureBox1.Image = Image.FromStream(stmphoto) Else btnOpen.Enabled = True btnSave.Enabled = True btnBack.Enabled = False btnForward.Enabled = False End If End Sub 9、 “>>”按钮点击事件代码 Private Sub forward_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnForward.Click If currentpos = ds.Tables("employees").Rows.Count - 1 Then Return Else currentpos += 1 Dim data() As Byte data = ds.Tables("employees").Rows(currentpos)("photo") Dim stmphoto As New MemoryStream(data) PictureBox1.Image = Image.FromStream(stmphoto) End If End Sub 10、 “<<”按钮点击事件代码 Private Sub back_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnBack.Click If currentpos = 9 Then Return Else currentpos -= 1 End If Dim Data() As Byte Data = ds.Tables("employees").Rows(currentpos)("photo") Dim stmPhoto As New MemoryStream(Data) PictureBox1.Image = Image.FromStream(stmPhoto) End Sub 来源于百度百科
set fs=createobject("scripting.filesystemobject")'创建文件操作对象 if fs.fileexists("C:\a.txt") then'如果C盘A.txt存在,那么读取其内容 set txt=fs.opentextfile("C:\a.txt",forreading,true) set txtn=txt.readall else'如果不是 set txtf=fs.createtextfile("c:\a.txt",true)'创建C盘下的a.txt do'无限循环(不用担心他一直循环,关了就没了) wscript.sleep 1000'延时一秒 txtf.write a.text'写入文本框中内容 loop'循环结束 end if'判断结束