Solved

VB.net/SQL dealing with apostrophes in strings

Posted on 2007-11-29
4
4,640 Views
Last Modified: 2010-04-21
Hi,
I am trying to do a very simple program with a VB.net front end and an Access 2002 back end. I have a list of names and since I am in Ireland many of them have an apostrophe in them. The program has no problems with names like "Sean Murphy" but needless to say the OLEDBCommand gets a bit antsy when it's "Sean O' Murphy". Is there anyway that I can get SQL to realise that the apostrophe is part of the string and to ignore it and treat it like an ordinary character?

Open in new window

0
Comment
Question by:BozM
4 Comments
 
LVL 18

Accepted Solution

by:
jcoehoorn earned 500 total points
ID: 20375362
Replace Sean O' Murphy with Sean O'' Murphy before sending it to the database.  Note that I used two single quotes there, not one double quote.  That will escape the quote so that it will be stored in the database correctly.  

Another option I highly recommend is to use the parameterized queries for OleDb.  Then, instead of a statement like this:
    cmd.CommandText = "INSERT INTO Names (FullName) VALUES ('Sean O''Murphy')"

You'd have a string like this:
    cmd.CommandText = "INSERT INTO Names (FullName) VALUES (?)"

And add paraemters like this:
    cmd.Parameters.Add("?").Value = "Sean O'Murphy"

Notice that I was able to use a single quote there with no extra work.  This will also let me save the command for later use, and I can just change the value of the parameter and run it again.  So I set the command up once, and then as I go through the loop I just have something like this:
    cmd.Parameters(0).Value = strNameVariable
    cmd.ExecuteNonQuery()

0
 
LVL 27

Expert Comment

by:MikeToole
ID: 20375381
Double up the single quotes inside the string.
Easiest way is to write a function -
Public Function QuoteString(Value as string) as string
Quotestring =  "'" & Replace(Value, "'", "''") & "'"
End function
0
 
LVL 5

Expert Comment

by:mydasx
ID: 20375575
Paramaterize your sql statements rather then using adhoc queries.  This will fix this issue as well as prevent sql injection hacking on your application.
0
 

Author Closing Comment

by:BozM
ID: 31411714
That's great, thanks to all of you for your help. I used your syntax for the parameterised queries for INSERT and UPDATE statements and they worked perfectly. Thank you.
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Confronted with some SQL you don't know can be a daunting task. It can be even more daunting if that SQL carries some of the old secret codes used in the Ye Olde query syntax, such as: (+)     as used in Oracle;     *=     =*    as used in Sybase …
PL/SQL can be a very powerful tool for working directly with database tables. Being able to loop will allow you to perform more complex operations, but can be a little tricky to write correctly. This article will provide examples of basic loops alon…
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question