数据库查询中的特殊字符的问题

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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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