[MediaWiki-l] Hidden categories: page_props consistence

Valerio Bozzolan bozzolan.valerio at educ.di.unito.it
Thu Jul 20 20:25:22 UTC 2017

I only have noticed now the varbinary type. This explains the phpMyAdmin

Thanks, you made my day.

On 20/07/2017 03:25, Bartosz DziewoƄski wrote:
> All text in MediaWiki's database uses MySQL's "BINARY" encoding by
> default, even though it's encoded in UTF-8, for historical reasons
> (MySQL's UTF-8 support used to be horribly broken).
> The software you're using to view it therefore decides to show you the
> binary bytes, rather than the actual text. I've seen this annoying
> behavior in some versions of PHPMyAdmin and MySQLWorkbench, I don't
> know what you're using.
> You can "decode" the value '68696464656e636174' based on the ASCII
> values for the hex codes:
> 0x68 = 'h'
> 0x69 = 'i'
> 0x64 = 'd'
> 0x64 = 'd'
> 0x65 = 'e'
> 0x6e = 'n'
> 0x63 = 'c'
> 0x61 = 'a'
> 0x74 = 't'
> (https://en.wikipedia.org/wiki/ASCII#Printable_characters)
> Or, you can cast it to the 'char' type in your query to make your
> software behave:
>   SELECT CAST(pp_propname as char) FROM page_props;
> The actual data stored in your database has been 'hiddencat' all along,
> and MediaWiki doesn't need to do anything special to get that. The
> problem is with the viewer software being too clever.

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Valerio Bozzolan

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