Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Need MySQL string function

Posted on 2011-09-13
3
Medium Priority
?
483 Views
Last Modified: 2012-05-12
Experts,

new to mySQL.

i'm using the following function on a string in vb.net:

 Public Function subStringCount(ByVal fullString As String, ByVal subString As String) As Integer
       
        Dim r As New Regex(subString)
        Dim mc As MatchCollection = r.Matches(fullString)

        Return mc.Count

    End Function

i'm calling it like this:

    subStringCount(strGameHistory, "ET")

It takes a string and counts the occurance of a subset of characters within the string.

my data can look like this: "S0ETS2ETS5C0ETS2C0ETS1C1ET"

Is it possible to have this operation done within the where clause of my select? I'd rather not have to pull all the data back before performing this operation. so, something like:

select game_history from table1 where function_counting_occurance_subset_of_char(game_history, 'ET') = 5;

TIA,

crafuse
 
0
Comment
Question by:crafuse
  • 2
3 Comments
 
LVL 35

Accepted Solution

by:
Terry Woods earned 2000 total points
ID: 36534021
I think this technique should kind of work, but it's a little hacky:
http://pisceansheart.wordpress.com/2008/04/15/count-occurrence-of-character-in-a-string-using-mysql/

Which would give this I believe:
select game_history from table1 where ( (LENGTH(game_history) - LENGTH(REPLACE(game_history, 'ET', '')))/LENGTH('ET') ) = 5;
0
 
LVL 35

Expert Comment

by:Terry Woods
ID: 36534042
Having a bit more of a look around the web, it appears that's the best way to do it.
0
 

Author Closing Comment

by:crafuse
ID: 36534064
this is a perfect example of why this site can be pretty amazing!

great answer, works like a charm, thanks!
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
When table data gets too large to manage or queries take too long to execute the solution is often to buy bigger hardware or assign more CPUs and memory resources to the machine to solve the problem. However, the best, cheapest and most effective so…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses
Course of the Month14 days, 18 hours left to enroll

578 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