MySQL: INSERT IF NOT EXISTS syntax

Mario — Tue, 03 Jan 2012 10:06:01 +0000

“Insert Ignore into” increments auto number even in cases that new record is not added.

MySQL: INSERT IF NOT EXISTS syntax

KKR — Fri, 16 Dec 2011 20:35:58 +0000

INSERT into Foo.bar select “va11″, “val2″ from dual where not exists (select val1 from Foo.bar where username = “val1″);

MySQL: INSERT IF NOT EXISTS syntax

Subhendu — Tue, 29 Nov 2011 19:03:25 +0000

Thanks dude..

After struggling for couple of hours I found this “INSERT IGNORE INTO”.

Thanks A TON

MySQL: INSERT IF NOT EXISTS syntax

Frank — Mon, 21 Nov 2011 11:23:14 +0000

Thanks for info:INSERT IGNORE INTO table_name SET col = ‘value’;
Still, table shall be updated as:
ALTER TABLE `db_name`.`table_name` ADD UNIQUE KEY(col);
(otherwise, the first statement won’t work.)
All the best,

MySQL: INSERT IF NOT EXISTS syntax

Bill — Fri, 14 Oct 2011 13:19:14 +0000

I have created a page that will automatically add posts to WordPress but every time it runs, it creates duplicate posts. The code string is below. I’ve tried several variations to get the code to update the record if it has changed, otherwise ignore it and add any new records. Any help would be appreciated.

$link = mysql_connect($hostname, $user, $pass);
mysql_select_db($dbname, $link);

$results = mysql_query(“SELECT * FROM genesis”,$link);

require(‘./wp-load.php’);

MySQL: INSERT IF NOT EXISTS syntax

MySQL if exist update else insert | prosoxi.com — Thu, 29 Sep 2011 11:40:25 +0000

[...] http://bogdan.org.ua/2007/10/18/mysql-insert-if-not-exists-syntax.html [...]

MySQL: INSERT IF NOT EXISTS syntax

Pope — Tue, 20 Sep 2011 17:37:19 +0000

You are my Hero!

MySQL: INSERT IF NOT EXISTS syntax

Chris — Fri, 09 Sep 2011 17:29:14 +0000

cheers – just saved me a real headache. Was considering doing a SELECT for every record, checking for existence, then making a decision based on that… man, sometimes I go round the houses when a simple solution is right there in front of me.

MySQL: INSERT IF NOT EXISTS syntax

Thanks — Mon, 29 Aug 2011 04:22:10 +0000

Thanks man.. first result on google, no need to go anywhere else

MySQL: INSERT IF NOT EXISTS syntax

Claude Quézel — Fri, 18 Feb 2011 03:54:10 +0000

Note that the mysql doc states:

If the statement updates a row instead, LAST_INSERT_ID() is not meaningful. However, you can work around this by using LAST_INSERT_ID(expr). Suppose that id is the AUTO_INCREMENT column. To make LAST_INSERT_ID() meaningful for updates, insert rows as follows:

INSERT INTO table (a,b,c) VALUES (1,2,3)
ON DUPLICATE KEY UPDATE id=LAST_INSERT_ID(id), c=3;

MySQL: INSERT IF NOT EXISTS syntax

vivin — Thu, 30 Sep 2010 05:17:46 +0000

nice thank u!!!

MySQL: INSERT IF NOT EXISTS syntax

ViserExcizer — Sun, 19 Sep 2010 04:42:08 +0000

wundervoll! thanks for this

MySQL: INSERT IF NOT EXISTS syntax

ienaxxx — Wed, 08 Sep 2010 15:19:31 +0000

Very nice article, really useful

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Fri, 16 Jul 2010 12:04:36 +0000

MySQL-specific solution would be to use autoincrement (linked page also has an example for a two-component primary key, something like your X and Y; see also comments there for more detailed explanation).

Actually, do think if you really want those X and Y serve the purpose of unique IDs… maybe it is better having a single ID, and storing X and Y as values?

In any case, you could implement X/Y-incrementing logic in your app completely DB-engine independently, e.g.
X.new = SELECT MAX(X) + 1 FROM table; Y.new = SELECT MAX(Y) + 1 FROM table; INSERT INTO table(X, Y, note) VALUES (X.new, Y.new, note);
However, in this case you should be aware of possible race conditions, if there are several processes possibly writing to that table. To avoid that, you will need table locking. Some apps (e.g. Gallery2) maintain separate tables (sequences) of incremental IDs, to avoid locking data-tables in favour of locking only sequence-tables…

Better use a single autoincrement ID

MySQL: INSERT IF NOT EXISTS syntax

cutesmyls — Fri, 16 Jul 2010 06:12:57 +0000

Hi!

I have a note table, each note has a respective x and y positions..and everytime i add/create a new note, the newly added note should have a unique x and y values in the db..can you suggest on how to do this on sql?

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Fri, 11 Jun 2010 23:24:03 +0000

Using sub-query most likely will be slower than all the other solutions (because sub-queries will use temporary tables). Also, MySQL INSERT...SELECT manual page says: However, you cannot insert into a table and select from the same table in a subquery. Thus, your solution may not work at all.

MySQL: INSERT IF NOT EXISTS syntax

Server — Fri, 11 Jun 2010 18:29:33 +0000

Also i’m using

INSERT INTO `table` (value1,value2) SELECT ‘stuff for value1′,’stuff for value2′ WHERE NOT EXISTS (SELECT * FROM table WHERE value1=’stuff for value1′ AND value2=’stuff for value2′) LIMIT 1

MySQL: INSERT IF NOT EXISTS syntax

Alex — Thu, 22 Apr 2010 06:53:39 +0000

REPLACE INTO `transcripts` SET `ensembl_transcript_id` = 'ENSORGT00000000001', `transcript_chrom_start` = 12345, `transcript_chrom_end` = 12678;

It’s important to note that unless you mention all fields and have autogenerated fields (such as autoincremented primary key), you get to screw up your DB with this method:

I tried
REPLACE INTO images SET filename='variable'

and guess what, since a record existed, its autoincremened ID got changed.
So watch out for such mistakes: my error may be your lesson.

MySQL: INSERT IF NOT EXISTS syntax

Bogdan — Tue, 09 Mar 2010 15:46:15 +0000

Thanks, that was an interesting comparison. I only had tens of thousands of rows, so didn’t pay attention to performance.

MySQL: INSERT IF NOT EXISTS syntax

Eddie — Tue, 09 Mar 2010 15:07:46 +0000

I did some speed benchmarking of these methods and found that ON DUPLICATE KEY is the faster that INSERT IGNORE. I also found that just letting the query fail because of a primary key constraint is faster than both. For my application, anyway. Your mileage may vary. More info in my “website” link.