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) & """
[此贴子已经被作者于2004-06-12 09:09:21编辑过]
