This is often the case when querying a database:
For example, to query a user's database for his username and his password, there are special characters in the name and password that the user uses, such as single quotes, "|" Number, double quotes or hyphen "&".
For example, his name is 1 "test, the password is a|&900
When you execute the following query statement, you will definitely get an error:
SQL = "SELECT * from SecurityLevel WHERE uid=" "& UserID &" ""
sql = SQL & "and pwd=" & Password & "" "
Because your SQL is going to be like this:
SELECT * from SecurityLevel WHERE uid= "1" Test "and pwd=" a|&900 "
In sql, the "|" For the Split field, it's obviously going to go wrong. Now provide a few of the following functions specifically for dealing with these headaches:
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 (+) &" ", 0)
Findfirstfixup = Replacestr (Temp, "|", "" "& Chr (124) &" ", 0)
End Function
With the above several functions, before you execute a SQL, please use the
SQL = "SELECT * from SecurityLevel WHERE uid=" "& Sqlfixup (UserID) &" "
sql = SQL & "and pwd=" & Sqlfixup (Password) & ""
The principle is not difficult, but I always think is not trouble? Is there a better way? Or I want to use JavaScript control not to use these symbols.
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.