很簡(jiǎn)單的。這個(gè)最基本的了。
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就是從數(shù)據(jù)庫表中 找出一個(gè)記錄,名稱和密碼都和你輸入的一樣的記錄,就表示登陸成功。
簡(jiǎn)單的思路:(密碼也沒有加密等)
dim dt As New DataTable
dim cmd As New SqlCommand
With cmd
.CommandText = "Select * From Users Where UserName=@UserName and UserPwd=@UserPwd"
.Parameters.Add(New SqlClient.SqlParameter("@UserName", "=你輸入的用戶名TextBox1.Text"))
.Parameters.Add(New SqlClient.SqlParameter("@strColorNo", "=你輸入的密碼TextBox2.Text"))
End With
dt =SqlHelper.GetDatatable(cmd)
if dt.rows.count0 then
msgbox "ok"
else
msgbox "error"
end if
Dim MyClient As WebClient = New WebClient
Dim MyReader As New System.IO.StreamReader(MyClient.OpenRead(url), System.Text.Encoding.Default) '定義新的文件流并讀取網(wǎng)頁文件數(shù)據(jù),url表示需要打開的網(wǎng)頁地址
Dim longTxt As String = MyReader.ReadToEnd 'longtxt存儲(chǔ)了網(wǎng)頁的源碼
MyReader.Close()
Dim url As String=" 網(wǎng)址"
Dim httpReq As System.Net.HttpWebRequest
Dim httpResp As System.Net.HttpWebResponse
Dim httpURL As New System.Uri(url)
httpReq = CType(WebRequest.Create(httpURL), HttpWebRequest)
httpReq.Method = "GET"
httpResp = CType(httpReq.GetResponse(), HttpWebResponse)
httpReq.KeepAlive = False ' 獲取或設(shè)置一個(gè)值,該值指示是否與
Internet資源建立持久連接。
Dim reader As StreamReader = _
New StreamReader(httpResp.GetResponseStream,
System.Text.Encoding.GetEncoding(-0))
Dim respHTML As String = reader.ReadToEnd() 'respHTML就是網(wǎng)頁源代碼
下面這段代碼,是我用來計(jì)算每個(gè)月存500元進(jìn)銀行,連續(xù)30年,最后連本帶利能有多少錢。這里面涉及復(fù)利計(jì)算。界面中右邊的文本框用來輸出每一次計(jì)算的結(jié)果。
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
? Dim nianxian As Integer '年限變量
? Dim dingcun As Integer '定存變量
? Dim fuli_big As Long '大復(fù)利
? Dim fuli_small As Long '小復(fù)利
? Dim i As Integer '循環(huán)變量
? Dim DATAstring As String '數(shù)據(jù)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
? 結(jié)果_TextBox.Text = Str(fuli_big) + "元"
End Sub