解决ASP执行DB查询中的特殊字符问题

2018-09-06 11:16

阅读:453

  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1test,密码是A900,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=1testAND PWD=A900

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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