更新列值，替换字符串的一部分

Question

I have a table with the following columns in a MySQL database

[id, url]

And the URLs are like:

 http://domain1.example/images/img1.jpg

I want to update all the URLs to another domain

 http://domain2.example/otherfolder/img1.jpg

keeping the name of the file as is.

What's the query must I run?

Answer 1

UPDATE urls
SET url = REPLACE(url, 'domain1.example/images/', 'domain2.example/otherfolder/')

Answer 2

UPDATE yourtable
SET url = REPLACE(url, 'http://domain1.example/images/', 'http://domain2.example/otherfolder/')
WHERE url LIKE ('http://domain1.example/images/%');

relevant docs: http://dev.mysql.com/doc/refman/5.5/en/string-functions.html#function_replace

Answer 3

Try using the REPLACE function :

mysql> SELECT REPLACE('www.example.com', 'w', 'Ww');
        -> 'WwWwWw.example.com'

Note that it is case sensitive.

Answer 4

Try this...

update [table_name] set [field_name] = 
replace([field_name],'[string_to_find]','[string_to_replace]');

Answer 5

You need the WHERE clause to replace ONLY the records that complies with the condition in the WHERE clause (as opposed to all records). You use % sign to indicate partial string: IE

LIKE ('...//example.com/images/%');

means all records that BEGIN with "...//example.com/images/" and have anything AFTER (that's the % for...)

Another example:

LIKE ('%http://example.com/images/%')

which means all records that contains "http://example.com/images/"

in any part of the string...

Answer 6

First, have to check

SELECT * FROM `university` WHERE course_name LIKE '%&amp%'

Next, have to update

UPDATE university
SET course_name = REPLACE(course_name, '&amp', '&') WHERE id = 1

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