I know very little about sql queries but I need a query to replace '\\' with '\/'
I have a Wordpress database where there are characters in a long text string that look like this in phpMyAdmin Browse.
'\\uploads\\photos\\'
It needs to be '\/uploads/photos\/'. I want a query to find '\\uploads\\photos\\' so I can make sure the query is working.
I also want another query to permanently replace '\\uploads\\photos\\' with '\/uploads\/photos\/'.
The below query that finds photos returns results, but that's as far as I got.
SELECT *
FROM `mytable`
WHERE `mycolumn` LIKE '%photos%'
Thank you forpas for the excellent solution!
For future readers:
When I migrated my wordpress database from local online, all in one migration plugin missed the paths in wonderplugin gallery that I am using. Thus my requirement for the query.
This double backslashed \ text was in a long string and I was concerned that there were more double backslashes that could get changed. So adding on to the solution provided by forpas, I more accuratly targeted the path text. mytable was actually named wp_nonxenon_wonderplugin_gridgallery, and mycolumn was named data. This is the resultant query that will save me much work in the future.
UPDATE wp_nonxenon_wonderplugin_gridgallery
SET data = REPLACE(data, 'wp-content\\uploads\\photos\\', 'wp-content\/uploads\/photos\/')
WHERE data LIKE '%photos%';
You must escape each backslash with a double backslash:
SELECT REPLACE(mycolumn, '\\\\', '\\/')
FROM mytable
WHERE mycolumn LIKE '%photos%';
Or you can update the table:
UPDATE mytable
SET mycolumn = REPLACE(mycolumn, '\\\\', '\\/')
WHERE mycolumn LIKE '%photos%';
and the column will contain the values as you want them.
See the demo.
Related
I try to replace strings in MySQL table from:
href=\"example.com\"
to
href=\"https://example.com\"
I know correct query how to search and update string, it is works perfectly, until I try to change string with backslashes. Nothing doesn't work:
UPDATE `articles` SET `text` = REPLACE(`text`, 'href=\\\\"example.com\\\\"', 'href=\\\\"https://example.com\\\\"') WHERE `text` LIKE '%href=\\\\"example.com\\\\"%'
Of course I tried different variants and combinations with escaped and not escaped backslaches, with clause WHERE and without it. These all variants doesn't work. Nothing changes at all!
Also, when I pre-run this query in PHPMyAdmin (section "Find and Replace"), it correctly finds all articles that contains href=\"example.com\", but Replaced string shows me the same content as Original String.
My CMS, which has also built-in function for search and replace strings, also can't change strings with backslashes.
I'm totally stuck with this problem.
You put too much backslash on the replace search string so the string is not found. double backslash are stored as one backslash in the table, so you need to use 2x backslash when replacing the string and 4x backslash when doing search in where clause.
see demo here; http://sqlfiddle.com/#!9/c1e0eb/1
update articles
set text =
REPLACE(`text`, 'href=\\"example.com\\"', 'href=\\"https://example.com\\"')
where text like '%href=\\\\"example.com\\\\"%'
This is the query you want to update;
UPDATE `articles`
SET `text` = REPLACE(`text`, 'href=\\"example.com\\"', 'href=\\"https://example.com\\"')
WHERE `text` LIKE '%href=\\\\"example.com\\\\"%'
In my database I have a table called 'content' and a field called 'link' and there are almost 300,000 records in that table.
In the field called 'link' there are a number of records that look like this :
http://www.example.com/blah/blah/123456789/url=http://www.destination.com
Unfortunately the prefix part of the records are individually unique where the numbered portion is constant changing from 90 to 150 alpha-numeric characters
I would like to remove the prefix up to and/or including the url=
So that the only thing left in the record is :
http://www.destination.com OR
I could even work with
url=http://www.destination.com
and simply do a replace command against the "url=" part as a second mysql command.
If there was a wildcard command, this job would be much easier and I would just wildcard everything showing up in the link record between :
http://www.example.com/blah/blah/ wildcard url=
But as everyone knows... there is no such wildcard available
So it had me looking at the UPDATE, SET and TRIM(LEADING commands
UPDATE content
SET link =
TRIM(LEADING 'url=' FROM link)
But this DID NOT generate the changes I wanted
And so I took the labor intensive method of downloading the database and using a Search and Replace program to make the changes to the 44 thousand records that contained these parameters.
But I would love to find a command that I could simply pass to the database to make this simpler in the future.
Any thoughts on how to accomplish this change in the future would be greatly appreciated.
Thanks in advance ;
You can use the SUBSTRING_INDEX function:
UPDATE content SET link=SUBSTRING_INDEX( `link` , 'url=', -1 )
I have not tested it, so I would recommend you check that substring_index returns the desired string first.
Assuming that the part you want to keep always begins with 'http://' you could get the desired result string with the help of the SUBSTRING_INDEX function:
SELECT CONCAT('http://', SUBSTRING_INDEX(link, 'http://', -1)) FROM content;
and fix your table with the simple statement
UPDATE
content
SET
link = CONCAT('http://', SUBSTRING_INDEX(link, 'http://', -1));
Explanation:
SUBSTRING_INDEX with third parameter negative returns the substring from the last occurence of the needle in the second parameter to the end. Because 'http://' isn't included in the return value, we add it again.
Remark:
If you've got https:// urls too, you should be able to adapt my solution.
Quick background, I have a small database with a table named 'songs'. This table holds the title, artist and URL of music I have on my machine. Several of the single quotes have been dropped from the track title (for example, the don't is stored as dont) and I'm attempting to replace them. I just cannot get this query to affect any rows:
UPDATE Songs
SET Title = REPLACE (Title, 'dont', 'don\'t')
No love. Isn't this correct syntax? It tells me that 0 rows were updated.
If it helps, I'm running version 5.5.27. I know there are a couple hundred rows with improper donts in there... I'm about to dump the results into Notepad and do a find/replace on don't and just run an update statement that way, but it's kinda hacky. Any ideas friends?
A couple of sample rows:
"51","Dont Stay Home","311","311 Greatest Hits","Rap","E:\Music\311\311GreatestHits\dontstayhome.mp3"
"229","Dont Turn Around","Ace Of Base","The Very Best Of","Dance","E:\Music\AceofBase\VeryBestOf\03-ace_of_base-dont_turn_around.mp3"
The Fields in order are id, title, artist, album, genre, path
You have to do it like this
UPDATE Songs
SET Title = REPLACE(Title, 'Dont', 'Don\'t');
^ ^
The reason for that is
REPLACE(str,from_str,to_str)
Returns the string str with all occurrences of the string from_str
replaced by the string to_str. REPLACE() performs a case-sensitive
match when searching for from_str.
If you want to replace either case you can do
UPDATE Songs
SET Title = REPLACE(REPLACE(Title, 'Dont', 'Don\'t'), 'dont', 'don\'t')
WHERE Title LIKE '%dont%' -- it makes sense to limit update to only those rows that have dont in it no matter case
Here is SQLFiddle demo
The first thought is that there might be some invisible characters. What does the following return?
select *
from songs
where title like '%dont%';
EDIT:
I didn't notice this at first. The problem is the space after the function name. Try this:
UPDATE Songs
SET Title = REPLACE(Title, 'dont', 'don\'t');
This is explained in the documentation:
Note
By default, there must be no whitespace between a function name and
the parenthesis following it. This helps the MySQL parser distinguish
between function calls and references to tables or columns that happen
to have the same name as a function. However, spaces around function
arguments are permitted.
EDIT II:
I don't know if the collation has an effect. But you can also try using double quotes as the string delimiter:
UPDATE Songs
SET Title = REPLACE(Title, 'dont', "don't");
I am struggling with this query and want to know if I am wasting my time and need to write a php script or is something like the following actually possible?
UPDATE my_table
SET #userid = user_id
AND SET filename('http://pathto/newfilename_'#userid'.jpg')
FROM my_table
WHERE filename
LIKE '%_%' AND filename
LIKE '%jpg'AND filename
NOT LIKE 'http%';
Basically I have 700 odd files that need renaming in the database as they do not match the filenames as I am changing system, they are called in the database.
The format is 2_gfhgfhf.jpg which translates to userid_randomjumble.jpg
But not all files in the database are in this format only about 700 out of thousands. So I want to identify names that contain _ but don't contain http (thats the correct format that I don't want to touch).
I can do that fine but now comes the tricky bit!!
I want to replace that file name userid_randomjumble.jpg with http://pathto/filename_userid.jpg So I want to set the column user_id in that row to a variable and insert it into my new filename.
The above doesn't work for obvious reasons but I am not sure if there is a way round what I'm trying to do. I have no idea if it's possible? Am I wasting my time with this and should I turn to PHP with mysql and stop being lazy? Or is there a way to get this to work?
Yes it is possible without the php. Here is a simple example
SET #a:=0;
SELECT * FROM table WHERE field_name = #a;
Yes you can do it using straightforward SQL:
UPDATE my_table
SET filename = CONCAT('http://pathto/newfilename_', userid, '.jpg')
WHERE filename LIKE '%\_%jpg'
AND filename NOT LIKE 'http%';
Notes:
No need for variables. Any columns of rows being updated may be referenced
In mysql, use CONCAT() to add text values together
With LIKE, an underscore (_) has a special meaning - it means "any single character". If you want to match a literal underscore, you must escape it with a backslash (\)
Your two LIKE predicates may be safely merged into one for a simpler query
I found a CSV database of Cities/ZIP/GPS, and when I imported it, it added a " infront of the columns.
alt text http://www.grabup.com/uploads/58754a865eebd94c9aafaf7444b52d15.png?direct
I don't want to go in for 33,000 entries and do this manually, is there a query I can run that will remove the quotes?
i'm not a MySql expert but this should work: (based on my similar experience in Sql Server)
UPDATE table_name SET col_name = REPLACE(col_name, '"', '')
For more info on the REPLACE and other string parsing functions, see here:
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
in sql server you coud do:
update mytable set state= substring(state,2,29)
change the "29" to whatever the actual length is.
I am sure mysql must have equivalent syntax.
Repeat for each field, it looks like there is only a handful of them.
As an alternative you could filter the original csv document - isn't that easier?