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Asked: 2026-06-18T15:21:35+00:00

trying to add text to an existing value in mysql using mysql’s concat function?

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trying to add text to an existing value in mysql using mysql’s concat function?

so existing value is currently ‘john’ and after function has run will be ‘johnewvalue’

i am trying to add a piece of text ‘:reply’ to the existing text which is in my subject column in my database ptb_messages.

i am trying to do this using mysql’s concat function but im not getting any result what so ever.

$sql = mysql_query("UPDATE ptb_messages SET subject = CONCAT subject, 'newvalue' WHERE id='".$message_id."'");

can someone please show me a way of getting it to do what i want. thanks.

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1 Answer

  1. Editorial Team

    it should be

    UPDATE ptb_messages 
SET subject = CONCAT( subject, 'newvalue')
WHERE ...

    in PHP

    $sql = mysql_query("UPDATE ptb_messages SET subject = CONCAT(subject, 'newvalue') WHERE id='".$message_id."'");

    As a sidenote, the query is vulnerable with SQL Injection if the value(s) of the variables came from the outside. Please take a look at the article below to learn how to prevent from it. By using PreparedStatements you can get rid of using single quotes around values.

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