Solved

Escape character problems in sqlConnectionString

Posted on 2003-11-05
7
457 Views
Last Modified: 2010-03-31
Here's the code I'm having problems with:

sqlQueryString += " WHERE " + filterField + " = '" + filter + "'";

//later I use it like this:

            dbStatement = dbConn.createStatement();
            dbResultSet = dbStatement.executeQuery(sqlQueryString);
            return true;

the problem is that java inserts escape characters (\) before the ' on the "filter" variable.

so sqlQueryString ends up looking like this:
        "select UserName from Users WHERE UserID = \'billybob\'"
and of course this throws an exception when it get to the database (Oracle). What I want the sqlQueryString to look like is:
        "select UserName from Users WHERE UserID = 'billybob'"

Seems to me I must be missing something cuz this is a pretty common operation I'm trying to do here. Help!

Thank you,

Jon
0
Comment
Question by:jonleehacker
[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
  • 3
  • 2
  • 2
7 Comments
 
LVL 92

Expert Comment

by:objects
ID: 9692327
If you use a prepared statement then all escaping required is handled for you by the driver.
http://java.sun.com/docs/books/tutorial/jdbc/basics/prepared.html
0
 
LVL 92

Accepted Solution

by:
objects earned 50 total points
ID: 9692332
PreparedStatement ps = connection.prepareStatement("select UserName from Users WHERE UserID = ?");
ps.setString(1, id);

0
 
LVL 9

Assisted Solution

by:Ovi
Ovi earned 50 total points
ID: 9693752
set the connection url to use a specific encoding (usually charSet=utf-8):
jdbc:postgresql://localhost:5432/A_DATABASE?charSet=utf-8
0
Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

 
LVL 1

Author Comment

by:jonleehacker
ID: 9694731
OOOOOOps,

While trying out your suggestions I found the problem (it was unrelated to my question).

Thanks for your responses, since I'm a novice they were both useful to me.

If I can figure out how I will split the points between the two.

Jon
0
 
LVL 1

Author Comment

by:jonleehacker
ID: 9694758
Sorry Ovi,

It made me choose only one as the official 'accepted answer' to I choose object since he was first.

Thanks again,

Jon
0
 
LVL 9

Expert Comment

by:Ovi
ID: 9695545
No prob., thank you too.
0
 
LVL 92

Expert Comment

by:objects
ID: 9697286
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

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

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
Suggested Courses

623 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