帮忙看一下防sql注入攻击代码

<%
dim sql_injdata
SQL_injdata = "'|and|exec|insert|select|delete|update|count|*|%|chr|mid|master|truncate|char|declare"  
SQL_inj = split(SQL_Injdata,"|")  
If Request.QueryString<>"" Then
    For Each SQL_Get In Request.QueryString
        For Sql_Data = 0 To UBound(SQL_inj)
            if instr(Request.QueryString(SQL_Get),Sql_Inj(Sql_DATA))>0 Then  
                Response.Write "<Script Language=javascript>alert('无忧管理系统SQL通用防注入系统提示↓nn请不要在参数中包含非法字符尝试注入！');history.back(-1)</Script>"  
                Response.end  
            end if
        Next
    Next
End If  
If Request.Form<>"" Then  
    For Each Sql_Post In Request.Form  
        For SQL_Data=0 To Ubound(SQL_inj)  
            if instr(Request.Form(Sql_Post),Sql_Inj(Sql_DATA))>0 Then  
                Response.Write "<Script Language=javascript>alert('无忧管理系统SQL通用防注入系统提示↓nn请不要在参数中包含非法字符尝试注入！');history.back(-1)</Script>"
                Response.end  
            end if  
        next  
    next  
end if  
%>