I have a database that stores static paths of image cache files we keep. Something like:
http://subdomain.domain.com/img/cache/24295839.jpg
is stored hundreds of thousands of times. We recently switched to SSL and need to create some type of script to change all of the http to https in the database.
The field is:
cached_file_url
I don't know where to start with this. Any help would be appreciated.
UPDATE yourtable
SET
cached_file_url = CONCAT('https://',
SUBSTRING_INDEX(cached_file_url, 'http://', -1))
Please see fiddle here.
You should be able to do this in one simple query.
UPDATE table
SET cached_file_url = REPLACE(cached_file_url, 'http://', 'https://')
WHERE cached_file_url LIKE 'http://%'
You should familiarize yourself with MySQL string functions (or at least know where to look when you have questions like this).
http://dev.mysql.com/doc/refman/5.5/en/string-functions.html
You can do a lot of the sorts of string manipulations you might commonly do in a programming language within MySQL itself.
Related
There are quite a few different threads about this similar topic, yet I have not been able to fully comprehend a solution to my problem.
What I'd like to do is quite simple, I have a flat-file db, with data stored like this -
$username:$worldLocation:$resources
The issue is I would like to have a submit data html page that would update this line based upon a search of the term using php
search db for - $worldLocation
if $worldLocation found
replace entire line with $username:$worldLocation:$updatedResources
I know there should be a fairly easy way to get this done but I am unable to figure it out at the moment, I will keep trying as this post is up but if you know a way that I could use I would greatly appreciate the help.
Thank you
I always loved c, and functions that came into php from c.
Check out fscanf and fprintf.
These will make your life easier while reading writing in a format. Like say:
$filehandle = fopen("file.txt", "c");
while($values = fscanf($filehandle, "%s\t%s\t%s\n")){
list($a, $b, $c) = $values;
// do something with a,b,c
}
Also, there is no performance workaround for avoiding reading the entire file into memory -> changing one line -> writing the entire file. You have to do it.
This is as efficient as you can get. Because you most probably using native c code since I read some where that php just wraps c's functions in these cases.
You like the hard way so be it....
Make each line the same length. Add space, tab, capital X etc to fill in the blanks
When you want to replace the line, find it and as each line is of a fixed length you can replace it.
For speed and less hassle use a database (even SQLLite)
If you're committed to the flat file, the simplest thing is iterating through each line, writing a new file & changing the one that matches.
Yeah, it sucks.
I'd strongly recommend switching over to a 'proper' database. If you're concerned about resources or the complexity of running a server, you can look into SQLite or Berkeley DB. Both of these use a database that is 'just a file', removing the issue of installing and maintaining a DB server, but still you the ability to quickly & easily search, replace and delete individual records. If you still need the flat file for some other reason, you can easily write some import/export routines.
Another interesting possibility, if you want to be creative, would be to look at your filesystem as a database. Give each user a directory. In each directory, have a file for locations. In each file, update the resources. This means that, to insert a row, you just write to a new file. To update a file, you just rewrite a single file. Deleting a user is just nuking a directory. Sure, there's a bit more overhead in slurping the whole thing into memory.
Other ways of solving the problem might be to make your flat-file write-only, since appending to the end of a file is a trivial operation. You then create a second file that lists "dead" line numbers that should be ignored when reading the flat file. Similarly, you could easily "X" out the existing lines (which, again, is far easier than trying to update lines in a file that might not be the same length) and append your new data to the end.
Those second two ideas aren't really meant to be practical solutions as much as they are to show you that there's always more than one way to solve a problem.
ok.... after a few hours work..this example woorked fine for me...
I intended to code an editing tool...and use it for password update..and it did the
trick!
Not only does this page send and email to user (sorry...address harcoded to avoid
posting aditional code) with new password...but it also edits entry for thew user
and re-writes all file info in new file...
when done, it obviously swaps filenames, storing old file as usuarios_old.txt.
grab the code here (sorry stackoverflow got VERY picky about code posting)
https://www.iot-argentina.xyz/edit_flat_databse.txt
Is that what you are location for :
update `field` from `table` set `field to replace` = '$username:$worldlocation:$updatesResources' where `field` = '$worldLocation';
Currently I have url's in this format:
http://www.domain.com/members/username/
This is fine.
However each user may have several 'songs' associated with their account.
The url's for the individual song's look like this:
http://www.domain.com/members/username/song/?songid=2
With the number at the end obviously referring to the ID in the MySQL database.
Using jQuery/javascript, the ID is collected from the URL and the database is then queried and the relevent song/page is rendered.
I would like to change these URL's to the following format instead:
http://www.domain.com/members/username/song/songname/
But I have absolutely no idea how to go about it. I've been doing quite a bit of reading on the subject but haven't found anything quite relevant to my situation.
To further compound the challenge, song names are not always unique. For instance if we image the song name 'hello' it is quite possible that another song may exist in the database with the same name, albeit with a different song ID.
Given the limit information you are recieving in this question I am quite content with more generalised answers, describing the approach to take.
General info:
Apache/Nginx proxy
Backend: PHP
jQuery/Javascript front end
I don't know how do you store songs in the database but an idea:
use URL rewrite to rewrite members/username/song/songname/ to song.php?user=username&song=songname. There are plenty of tutorials here or perhaps try to use an URL rewrite-generator tool.
In song.php, get these GET values. Do a MySQL query where the songname and the username match. Output the result.
Note: it is OBLIGATORY to make that a user can store only one song with a given name. Also, the storing user's name MUST be stored. Else this is impossible.
Simple Apache rewrites, in the main httpd.conf file, or an htaccess file if you don't have access to the main config file should suffice
I have been doing a bit of searching round StackOverflow and the Interweb and I have not had much luck.
I have a URL which looks like this...
nr/online-marketing/week-in-review-mobile-google-and-facebook-grab-headlines
I am getting the article name from the URL and replacing the '-' with ' ' to give me:
week in review mobile google and facebook grab headlines
At this point this is all the information that I have on the article so I need to use this to query the database to get the rest of the article information, the problem comes around but this string does not match the actual headline of the article, this this instance the actual headline is:
Week in review: Mobile, Google+ and Facebook grab headlines
As you can see it include extra punctuation, so I need to find a way of using MYSQL LIKE to match the article.
Hope someone can help, a standard SELECT * FROM table WHERE field LIKE $name does not work , im hoping of finding a way of doing it without splitting up each individual word but if that what it comes down to then so be it!
Thanks.
Try MySQL MyISAM engine's full-text search. In your case the query will be:
SELECT * FROM table
WHERE MATCH (title) AGAINST ('week in review mobile google and facebook grab headlines');
That requires you to convert the table to MyISAM. Also depending on the size of the table, test the performance of the query.
See more info under:
http://dev.mysql.com/doc/refman/5.0/en/fulltext-search.html
This really seems more like a database design issue... If you're using large texts with different fields as forms of primary keys it could lead to duplicates or synchronization problems.
One potential solution is to give each entry a unique identifier (perhaps an int or uniqueidentifier field if MSQL supports that), and use that field to map the actual healdine to the URL.
another potential solution is to create a table that will associate each headline with its URL and use that table for lookups. This will incur a little extra overhead, but will ensure that special characters in the title will never effect the lookup process.
As for a way to do this with your current design, you may be able to do some kind of regular expression search by tokenizing each word individually and then searching for an entry that includes all tokens, but I'm fairly certain that MSQL doesn't provide this functionality in a basic command.
I've been figuring out how to let apostrophe's cross URI's.
I'm building a site that allows users to "create photo albums". I have a link that when clicked, it will load and display all the contents of a certain album. I'm using codeigniter so this page is called this way:
http://www.fourthdraft.com/index.php/admin/manageAlbumContents/dan's/91
admin = controller
managealbums = function
dan's (album name) = variable
As you know, codeigniter does not allow apostrophe(') in uri's. My problems are:
If I htmlspecialchars/htmlentities
the album name it becomes &#xx;
Those new characters also not
allowed
If I url encode it becomes %xx. percent is allowed but codeigniter
urldecodes it before processing so
it just reverts back to apostrophe
I've tried making my own preg_replace ( ' => '~apos~' ) but i
just find it inefficient, too much
lines to run and tedious since I
have an 80% done website and the
strings I have to replace are
everywhere.
I've also considered using base64_encode. It takes more space
but it does the job. Then again, the
encoded version contains '=' which
is also disallowed
As much as possible I do not want to just add apostrophe in the allowed characters list in codeigniter's config file. I believe they don't have it there for a reason. At the same time, I'm running out of options.
The reason for wanting to allow apostrophe's is because in this context, it's bound to be used. For example, what if someone decided to put 'dan's birthday party' as an album name? It's bound to happen. and i'm pretty sure my users would complain. Even if I manage to convince them otherwise, what will i replace that with? dan_s birthday party? looks wrong. Also, if facebook can do it I should too. At the very least, if facebook did it, then that means there's a way.
If you guys have any suggestions, fire away. Otherwise I'm wondering if it's ok (and safe) to just allow apostrophe in the allowed URI characters. I know it's VERY dangerous for mysql which i use a lot but I just remembered codeigniter's query binding variables automatically escapes characters. I'm wondering if that would suffice and keep me safe.
Otherwise, please please please give me a good idea. I'm drained out
I like to believe that the days of mysql_query("SELECT * FROM table WHERE x={$_GET['val']}") are over. That being said, it's OK with any decent database library as long as you use parameter binding. So go ahead and use urlencode.
I have an old drupal site that I'd like to upgrade, but I need to move all the site data files (like jpgs, gifs, etc.) from /files to /sites/default/files.
I'd like to use a PHP script or just a MySQL command to find any instance of /files/* and change it to /sites/default/files/* (without messing up the string in the * part of the name, of course!).
Is this pretty easy to do? Any pointers on a function I could use?
MySQL does have some built-in string replacement functions. How about something like this?
UPDATE table SET field = REPLACE(field,'/files/','/sites/default/files/');
There's other functions you can use for more complex replacements (ie. regular expressions) if you need as well.
I'm pretty sure that it's just a case of changing the 'files' path in the Drupal configuration.
If you're just changing the files table, you can do an UPDATE with SQL, like zombat said. If you have a significant number of other instances of the paths ( IE - full HTML node bodies and the like ) your best bet would be to export the DB to a text file (can do it with mysqldump or the export feature of PHPMyAdmin) and then just update the strings there - either with a suitable text editor, a command-line tool like sed or a bunch of interns.