正在阅读:解决ASP执行DB查询中的特殊字符问题解决ASP执行DB查询中的特殊字符问题

2005-06-17 10:20 出处: 作者:csbq 责任编辑:moningfeng
在进行数据库的查询时,会经常遇到这样的情况:   例如想在一个用户数据库中查询他的用户名和他的密码,但恰好该用户使用的名字和密码中有特殊的字符,例如单引号,“|”号,双引号或者连字符“&”。   例如他的名字是1'test,密码是A|&900,这时当你执行以下的查询语句时,肯定会报错:   SQL = "SELECT * FROM SecurityLevel WHERE UID='" & UserID & "'"   SQL = SQL & " AND PWD='" & Password & "'"   因为你的SQL将会是这样:   SELECT * FROM SecurityLevel WHERE UID='1'test' AND PWD='A|&900'   在SQL中,"|"为分割字段用的,显然会出错了。现在提供下面的几个函数,专门用来处理这些头疼的东西:

Function ReplaceStr (TextIn, ByVal SearchStr As String, _   ByVal Replacement As String, _   ByVal CompMode As Integer)   Dim WorkText As String, Pointer As Integer If IsNull(TextIn) Then   ReplaceStr = Null Else   WorkText = TextIn   Pointer = InStr(1, WorkText, SearchStr, CompMode) Do While Pointer > 0   WorkText = Left(WorkText, Pointer - 1) & Replacement & _   Mid(WorkText, Pointer + Len(SearchStr))   Pointer = InStr(Pointer + Len(Replacement), WorkText, _   SearchStr, CompMode) Loop   ReplaceStr = WorkText End If End Function

Function SQLFixup(TextIn)   SQLFixup = ReplaceStr(TextIn, "'", "''", 0) End Function

Function JetSQLFixup(TextIn)   Dim Temp   Temp = ReplaceStr(TextIn, "'", "''", 0)   JetSQLFixup = ReplaceStr(Temp, "|", "' & chr(124) & '", 0) End Function

Function FindFirstFixup(TextIn)   Dim Temp   Temp = ReplaceStr(TextIn, "'", "' & chr(39) & '", 0)   FindFirstFixup = ReplaceStr(Temp, "|", "' & chr(124) & '", 0) End Function

  有了上面几个函数后,当你在执行一个sql前,请先使用:   SQL = "SELECT * FROM SecurityLevel WHERE UID='" & SQLFixup(UserID) & "'"   SQL = SQL & " AND PWD='" & SQLFixup(Password) & "'"

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