PreparedStatement update does not update on NULL values

Posted on 2014-04-06
Medium Priority
Last Modified: 2016-06-04
Hi Experts

I am trying to update a field with NULL values without success, but If I put an empty String the update works. The problem with putting an empty string is - my column field "fruitname" accepts unique values. I am using JDBC. see below what I am trying to do.

update fruits_tbl set uxservernames=concat(fruitname, \r\n'" + fruitname + "') where fruit_id=" +fruit_id)

The columns

fruit_id (INT) PRK | fruitname (VARCHAR(255) | fruitdescr VARCHAR(255)|

The fruitname column can hold a NULL value.

Thank you.
Question by:jw124210
LVL 35

Accepted Solution

Dan Craciun earned 380 total points
ID: 39981728
CONCAT returns NULL if any of the operators are NULL.

If you want to avoid this, us
CONCAT_WS('\r\n', fruitname, 'peach')

CONCAT_WS will simply skip any NULL values.

LVL 111

Expert Comment

by:Ray Paseur
ID: 39982795
In my experience MySQL NULL does not match an empty string of zero length.   However if the columns are defined NOT NULL DEFAULT '' an empty string will match.

Featured Post

The 14th Annual Expert Award Winners

The results are in! Meet the top members of our 2017 Expert Awards. Congratulations to all who qualified!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Password hashing is better than message digests or encryption, and you should be using it instead of message digests or encryption.  Find out why and how in this article, which supplements the original article on PHP Client Registration, Login, Logo…
Recursive SQL is one of the most fascinating and powerful and yet dangerous feature offered in many modern databases today using a Common Table Expression (CTE) first introduced in the ANSI SQL 99 standard. The first implementations of CTE began ap…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…

621 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question