SQL Error 1406 Data too long for column

Question

I am trying to execute the query below in MySQL but get the SQL error 1406 Data too long for column error every time. The column data type is longtext. Any ideas?

UPDATE `my_db`.`my_table` SET `content` = '<div id="primaryContent"><div id="offices_map"></div><!-- #offices_map --><div id="offices_mapControlPanel" class="cf"><ul id="offices_continentLinkList"><li><a href="#" rel="Africa">AFRIQUE</a></li><li><a href="#" rel="Asia">ASIE</a></li><li><a href="#" rel="Australasia">AUSTRALASIE</a></li><li><a href="#" rel="Europe" id="offices_europeLink" class="current">EUROPE</a></li><li><a href="#" rel="NorthAmerica">AMERIQUE DU NORD</a></li><li class="last"><a href="#" rel="SouthAmerica">AMERIQUE DU SUD</a></li></ul><ul id="offices_mapLegend"><li id="offices_mapLegendRedPointer">Bureaux Panavision</li><li id="offices_mapLegendYellowPointer">Agents Panavision</li></ul></div><!-- #offices_mapLegend --><div id="offices_ownedOfficesContactDetails" class="cf"><h2>Bureaux Panavision</h2><ul class="cf"><li class="first"><strong>Panavision Greenford</strong> - pour l''Europe et l''Afrique - <a href="#" id="offices_linkPanavisionGreenford">D&#233;tails</a></li><li>Panavision Prague - <a href="#" id="offices_linkPanavisionPrague">D&#233;tails</a></li><li>Panavision Manchester - <a href="#" id="offices_linkPanavisionManchester">D&#233;tails</a></li><li>Panavision Alga &amp; Cinecam - <a href="#" id="offices_linkPanavisionAlga">D&#233;tails</a></li><li>Panavision Rh&ocirc;ne-Alpes - <a href="#" id="offices_linkPanavisionRhoneAlpes">D&#233;tails</a></li><li>Panavision Marseille - <a href="#" id="offices_linkPanavisionMarseille">D&#233;tails</a></li><li>Panavision Pologne - <a href="#" id="offices_linkPanavisionPoland">D&#233;tails</a></li><li>Panavision Dublin - <a href="#" id="offices_linkPanavisionDublin">D&#233;tails</a></li><li>Panavision Belgique - <a href="#" id="offices_linkPanavisionBelgium">D&#233;tails</a></li></ul></div><!-- #offices_ownedOfficesContactDetails --></div><!-- #offices_mapControlPanel --><div class="cf"></div>' WHERE `my_table`.`id` = 27;

Thanks, here's the result from SHOW CREATE TABLE

   CREATE TABLE `my_table` (  
  `content` longtext NOT NULL,  
  `cat` text NOT NULL,  
  `starter` int(1) NOT NULL,  
  `at` int(11) DEFAULT '0',  
  `table` varchar(60) DEFAULT NULL,  
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  PRIMARY KEY (`id`)  
) ENGINE=MyISAM AUTO_INCREMENT=84 DEFAULT CHARSET=latin1 |

Just tried this shorter query which contains no special/escaped chars but I still get the error.

UPDATE `my_db`.`my_table` SET `contenu` = '<div id="primaryContent"><div id="offices_map"></div><!-- #offices_map --><div id="offices_mapControlPanel" class="cf"><ul id="offices_continentLinkList"><li><a href="#" rel="Africa">AFRIQUE</a></li><li><a href="#" rel="Asia">ASIE</a></li><li><a href="#" rel="Australasia">AUSTRALASIE</a></li><li><a href="#" rel="Europe" id="offices_europeLink" class="current">EUROPE</a></li><li><a href="#" rel="NorthAmerica">AMERIQUE DU NORD</a></li><li class="last"><a href="#" rel="SouthAmerica">AMERIQUE DU SUD</a></li></ul><ul id="offices_mapLegend"><li id="offices_mapLegendRedPointer">Bureaux Panavision</li><li id="offices_mapLegendYellowPointer">Agents Panavision</li></ul></div><!-- #offices_mapLegend -->' WHERE `my_table`.`id` = 27;

[SOLVED] Thanks for your help everyone, I deleted the HTML comments and it worked.

Answer 1

Apart from the obvious possibility of getting an error for a different column (your error message does not seem to mention the exact column, which is weird), here's what the manual has to say about LONGTEXT:

A TEXT column with a maximum length of 4,294,967,295 or 4GB (232 – 1) characters. The effective maximum length is less if the value contains multi-byte characters. The effective maximum length of LONGTEXT columns also depends on the configured maximum packet size in the client/server protocol and available memory. Each LONGTEXT value is stored using a four-byte length prefix that indicates the number of bytes in the value.

You can verify maximum packet size with this query:

SELECT @@max_allowed_packet

If it happens to be a small value, see this related answer for further info.