?
Solved

Issues with apostrophe and Access query

Posted on 2004-10-05
6
Medium Priority
?
388 Views
Last Modified: 2010-05-18
Hi,

I have a query done through ASP.net to an access database.

The query goes: Select * from TableName where where sLastName Like ' & strName & '

The issue I am encountering is when I try to query someone by the name "O'neal". I get an OledbException error. I know the apostrophe is creating the issue so this is what I am trying:

If strTemp.IndexOf("'", 0, 1) Then
   strTemp.Replace(Chr(39), Chr(34)) ' to include only a quote instead of a single quote
End If

However, the value in the strTemp remains the same as if the replacement never happened. What am I doing wrong?
0
Comment
Question by:Luis_Romero
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 8

Expert Comment

by:bramsquad
ID: 12230954
your replacing the single quote  --> ' <-- with the double quote --> " <--

so what its doing is ending your string prematurely, so it would look like this:

"Select * from TableName where where sLastName Like "O"neal"

just use the double quote convention

yourSQL = "Select * from TableName where where sLastName Like " & Chr(34) & strName & Chr(34) & ";"

~b

0
 
LVL 44

Expert Comment

by:Arthur_Wood
ID: 12231236
or, you can apply the Replace function to strName:

yourSQL = "Select * from TableName where where sLastName Like '*" & Replace(strName, "'", "''") & "*'")

why are you using the LIKE operator, rather than =?

If you are going to use LIKE, then you should include the Wildcard charactrer (*) in the Where Clause.

AW
0
 
LVL 5

Accepted Solution

by:
ajitanand earned 1000 total points
ID: 12234053
Here is what I "used to use" for this purpose:
-----------------
Function FixQuotes(ByVal myString as String) AS String
        Return "'" & Replace(myString, "'", "''") & "'"
End Function

sqlString = "Select * from TableName where where sLastName Like " & FixQuotes(strName)


---------------------------------------------------
Although the better (actually longer but more elegant) way is to use the command object and append the values as parameters to your query as :

sqlString = "Select * from TableName where where sLastName Like "
Dim mySqlCommand As SqlCommand = New SqlCommand(sqlString, myConnection)

workParam = new OleDbParameter("MyLikeClause", OleDbType.WChar,50)
workParam.Value = strName
cmd.Parameters.Add(workParam)


The command parameters automatically fixes the quotes etc for you.
--------------------------------------------------

rgds,
Ajit Anand
0
Fill in the form and get your FREE NFR key NOW!

Veeam® is happy to provide a FREE NFR server license to certified engineers, trainers, and bloggers.  It allows for the non‑production use of Veeam Agent for Microsoft Windows. This license is valid for five workstations and two servers.

 
LVL 7

Expert Comment

by:gsiric
ID: 12235436
Replace dont replace characters in current string. You get new string instance with replaced characters.
So you need to assign result to strTemp.

If strTemp.IndexOf("'", 0, 1) Then
  strTemp =  strTemp.Replace(Chr(39), Chr(34)) ' to include only a quote instead of a single quote
End If
0
 
LVL 96

Expert Comment

by:Bob Learned
ID: 12237463
To create a SQL query looking for a single quote, you need to escape the sequence by using two single quotes.

strTemp =  strTemp.Replace(Chr(39), Chr(39) & Chr(39))

Bob
0
 

Author Comment

by:Luis_Romero
ID: 12240091
Thank you for all the response. Using the Parameter criteria with the OLE was the best solution because it takes care of a number of characters that otherwise I would had to manage manually.
Thank you all.

LR
0

Featured Post

Visualize your virtual and backup environments

Create well-organized and polished visualizations of your virtual and backup environments when planning VMware vSphere, Microsoft Hyper-V or Veeam deployments. It helps you to gain better visibility and valuable business insights.

Question has a verified solution.

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

In my previous article (http://www.experts-exchange.com/Programming/Languages/.NET/.NET_Framework_3.x/A_4362-Serialization-in-NET-1.html) we saw the basics of serialization and how types/objects can be serialized to Binary format. In this blog we wi…
A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

719 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