How to replace a string using MySQL query
This is a very naive post, and the only reason for writing it is so that I won't forget the syntax and have to Google MySQL REPLACEthe order of the arguments to the _ function again. And then when I try to look it up, I almost always end up on the documentation page for MySQL's other REPLACE_ command... which is used to update rows in a table using INSERTthe same syntax as the _ statement. Your confusion, MySQL!
What I'd like to do is search and replace in my database with a simple query WordPress- for example, when we switched HTG to HTTPS , we had a ton of old links and images pointing to the HTTP version. So we had to <img src=”http://www.jiyik.com/”>update all of our links to <img src=”https://www.jiyik.com”>, and with nearly 20,000 post records in our database, that would have required hiring a hundred interns. Or... one SQL statement.
So now, and hopefully this is the last time I have to look it up, use the MySQL query replacement string syntax:
UPDATE table set column1=REPLACE(column1,'SEARCH','REPLACE');
For the purposes of our example, WordPresswe’ll update all of our links and images to HTTPS in , ending up with:
UPDATE wp_posts set post_content = REPLACE(post_content, 'http://www.howtogeek.com','https://www.howtogeek.com');
This saves us from hiring 100 people to manually replace all those links. They deserve a raise.
Are you new here? If you don’t know how to open a MySQL prompt, then you probably shouldn’t be reading this article. But just in case, you can open a terminal and connect to your database using the values from wp-config.php (assuming you’re using WordPress), then paste in your SQL statements.
mysql -uUser -pPassword -hHost databasename
Did I mention that we should probably back up our database before running this WordPress? And we should definitely test it in a development or QA environment? Otherwise you'll break everything.
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