●在进行数据库的查询时,会经常遇到这样的情...... 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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