几个有用的ASP Function

<%@ Language=VBScript CODEPAGE=950%>
<% Option Explicit %>
<%

' ============================================
' 常用全局變量
' ============================================
' 數據庫對像
Dim oConn, oRs, sSql


' ============================================
' 初始數據處理
' ============================================
' 執行每天隻需處理一次的事件
'Call BrandNewDay()

' 初始化數據庫連接
'Call DBConnBegin()


' ********************************************
' 以下為初始函數
' ********************************************
' ============================================
' 執行每天隻需處理一次的事件
' ============================================
Sub BrandNewDay()
    Dim sDate, y, m, d, w
    Dim sDateChinese
    sDate = Date()
    If Application("date_today") = sDate Then Exit Sub

    y = CStr(Year(sDate))
    m = CStr(Month(sDate))
    If Len(m) = 1 Then m = "0" & m
    d = CStr(Day(sDate))
    If Len(d) = 1 Then d = "0" & d
    w = WeekdayName(Weekday(sDate))
    sDateChinese = y & "年" & m & "月" & d & "日&nbsp;" & w

    Application.Lock
    Application("date_today") = sDate
    Application("date_chinese") = sDateChinese        '今天的中文樣式
    Application.Unlock
End Sub



' ********************************************
' 以下為數據庫相關函數
' ********************************************
' ============================================
' 初始化數據庫連接對像
' 使用原則：最遲調用，最早釋放
' ============================================
Sub DBConnBegin()
    ' 如果數據庫對像已打開，不要再打開
    If IsObject(oConn) = True Then Exit Sub

    ' 你可以不需要打開數據庫連接對像而直接打開記錄集對像，但如果你需要打開多個記錄集對像的話，效率是很低的。
    ' 如果你不創建一個數據庫連接對像，ADO會在每個記錄集打開時自動創建一個新的數據庫連接對像，就算你用的是相同的SQL語句。
    Set oConn = Server.CreateObject("ADODB.Connection")

    On Error Resume Next
    ' Access數據庫
    oConn.Open "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Server.MapPath("db/ewebeditor.mdb")
    ' SQL Server 2000數據庫
    'oConn.Open "Provider=SQLOLEDB.1;Server=localhost;UID=ewebeditor;PWD=123456;Database=ewebeditor"
    
    If Err.Number > 0 Then
        ' 顯示錯誤信息,並且發送郵件通知管理員
        'Call DBConnError(Err)
        
        ' 完全地退出正在運行的腳本
        Response.End
    End If

    ' 創建一個記錄集
    Set oRs = Server.CreateObject( "ADODB.Recordset" )
End Sub

' ============================================
' 釋放數據庫連接對像
' ============================================
Sub DBConnEnd()
    On Error Resume Next
    oRs.Close
    Set oRs = Nothing
    oConn.Close
    Set oConn = Nothing
End Sub



' ********************************************
' 以下為常用函數
' ********************************************
' ============================================
' 錯誤返回處理
' ============================================
Sub Go_Error(str)
    Call DBConnEnd()
    Response.Write "<script language=javascript>alert('" & str & "\n\n系統將自動返回前一頁面');history.back();</script>"
    Response.End
End Sub

' ============================================
' 格式化時間(顯示)
' 參數：n_Flag
'    1:"yyyy-mm-dd hh:mm:ss"
'    2:"yyyy-mm-dd"
'    3:"hh:mm:ss"
'    4:"yyyy年mm月dd日"
'    5:"yyyymmdd"
' ============================================
Function Format_Time(s_Time, n_Flag)
    Dim y, m, d, h, mi, s
    Format_Time = ""
    If IsDate(s_Time) = False Then Exit Function
    y = cstr(year(s_Time))
    m = cstr(month(s_Time))
    If len(m) = 1 Then m = "0" & m
    d = cstr(day(s_Time))
    If len(d) = 1 Then d = "0" & d
    h = cstr(hour(s_Time))
    If len(h) = 1 Then h = "0" & h
    mi = cstr(minute(s_Time))
    If len(mi) = 1 Then mi = "0" & mi
    s = cstr(second(s_Time))
    If len(s) = 1 Then s = "0" & s
    Select Case n_Flag
    Case 1
        ' yyyy-mm-dd hh:mm:ss
        Format_Time = y & "-" & m & "-" & d & " " & h & ":" & mi & ":" & s
    Case 2
        ' yyyy-mm-dd
        Format_Time = y & "-" & m & "-" & d
    Case 3
        ' hh:mm:ss
        Format_Time = h & ":" & mi & ":" & s
    Case 4
        ' yyyy年mm月dd日
        Format_Time = y & "年" & m & "月" & d & "日"
    Case 5
        ' yyyymmdd
        Format_Time = y & m & d
    End Select
End Function

' ============================================
' 把字符串進行HTML解碼,替換server.htmlencode
' 去除Html格式，用於顯示輸出
' ============================================
Function outHTML(str)
    Dim sTemp
    sTemp = str
    outHTML = ""
    If IsNull(sTemp) = True Then
        Exit Function
    End If
    sTemp = Replace(sTemp, "&", "&amp;")
    sTemp = Replace(sTemp, "<", "&lt;")
    sTemp = Replace(sTemp, ">", "&gt;")
    sTemp = Replace(sTemp, Chr(34), "&quot;")
    sTemp = Replace(sTemp, Chr(10), "<br>")
    outHTML = sTemp
End Function

' ============================================
' 去除Html格式，用於從數據庫中取出值填入輸入框時
' 注意：value="?"這邊一定要用雙引號
' ============================================
Function inHTML(str)
    Dim sTemp
    sTemp = str
    inHTML = ""
    If IsNull(sTemp) = True Then
        Exit Function
    End If
    sTemp = Replace(sTemp, "&", "&amp;")
    sTemp = Replace(sTemp, "<", "&lt;")
    sTemp = Replace(sTemp, ">", "&gt;")
    sTemp = Replace(sTemp, Chr(34), "&quot;")
    inHTML = sTemp
End Function

' ============================================
' 檢測上頁是否從本站提交
' 返回:True,False
' ============================================
Function IsSelfRefer()
    Dim sHttp_Referer, sServer_Name
    sHttp_Referer = CStr(Request.ServerVariables("HTTP_REFERER"))
    sServer_Name = CStr(Request.ServerVariables("SERVER_NAME"))
    If Mid(sHttp_Referer, 8, Len(sServer_Name)) = sServer_Name Then
        IsSelfRefer = True
    Else
        IsSelfRefer = False
    End If
End Function

' ============================================
' 得到安全字符串,在查詢中使用
' ============================================
Function Get_SafeStr(str)
    Get_SafeStr = Replace(Replace(Replace(Trim(str), "'", ""), Chr(34), ""), ";", "")
End Function

' ============================================
' 取實際字符長度
' ============================================
Function Get_TrueLen(str)
    Dim l, t, c, i
    l = Len(str)
    t = l
    For i = 1 To l
        c = Asc(Mid(str, i, 1))
        If c < 0 Then c = c + 65536
        If c > 255 Then t = t + 1
    Next
    Get_TrueLen = t
End Function

' ============================================
' 判斷是否安全字符串,在注冊登錄等特殊字段中使用
' ============================================
Function IsSafeStr(str)
    Dim s_BadStr, n, i
    s_BadStr = "'   &<>?%,;:()`~!@#$^*{}[]|+-=" & Chr(34) & Chr(9) & Chr(32)
    n = Len(s_BadStr)
    IsSafeStr = True
    For i = 1 To n
        If Instr(str, Mid(s_BadStr, i, 1)) > 0 Then
            IsSafeStr = False
            Exit Function
        End If
    Next
End Function


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