escaping sqlite wildcards

Question

0.00/5 (No votes)

See more:

am trying to perform a search for this string

! @ # $ % ^ & * ( ) '

then i used the sql syntax

SQL

Select ID From Tasks Where task LIKE '[!] [@] [#] [$] [%] [^] [&] [*] [(] [)] ''%'

but i dont get any result, any help

Posted 15-Feb-13 1:33am

Cool Smith

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2013-02-15T01:51:00

Solution 1

Probably you want:

SQL

SELECT ID FROM Tasks WHERE task LIKE '! @ # $ \% ^ & * ( ) ''%' ESCAPE '\'

"in the database, the data in the field is Today's Task"

Check again - I just created a SQLite DB, with a table Tasks and three entries:

ID(int) Task(nvarchar(50)
1	Hello
2	Today's Task
3	XX Today's Task XX
NULL	NULL

Then I hacked some C#:

C#

string strCon = @"data source=D:\Temp\TestingSQLite.sldb";

SQLiteConnection con = new SQLiteConnection(strCon);
SQLiteCommand cmd = new SQLiteCommand("SELECT * FROM Tasks WHERE task LIKE '%Today''s Task%'", con);
con.Open();
DataTable dt = new DataTable();
SQLiteDataAdapter da = new SQLiteDataAdapter(cmd);
da.Fill(dt);

And got two rows: 2, and 3.

Check your data!

Posted 15-Feb-13 1:51am

OriginalGriff

Updated 15-Feb-13 6:26am

v2

Comments

Cool Smith 15-Feb-13 8:07am

hello, so even in other text, i only need to escape the % wilcard. say for example i need to search for "these are some wildcars & ! !" without the quote

OriginalGriff 15-Feb-13 8:25am

Yes - the only wildcards in SQLite LIKE comparisions are % and _ for "zero or more of any character" and "any single character" respectively, so they are the only ones you need to escape (except single quote, obviously!)

Cool Smith 15-Feb-13 9:29am

thank you very much. so even if i do this '%@! @@ @# $ @% @^ @& @* @( @) ''%', it doesn't have any negative effects right

OriginalGriff 15-Feb-13 9:34am

You might want to escape the "%" in the middle, but otherwise it's fine!

Cool Smith 15-Feb-13 9:44am

thank you very much

OriginalGriff 15-Feb-13 10:24am

You're welcome!

fjdiewornncalwe 15-Feb-13 10:20am

+5.

Cool Smith 15-Feb-13 11:43am

Hello I tried this statement
SELECT ID FROM Tasks WHERE task LIKE '%Today''s Task%'
and it failed to find the item, any idea what is wrong?

OriginalGriff 15-Feb-13 12:08pm

Without looking at your data? No idea at all! :laugh:

Cool Smith 15-Feb-13 12:10pm

in the database, the data in the field is Today's Task

OriginalGriff 15-Feb-13 12:26pm

Answer updated