Re: How to html-decode a html-encoded field

On 2012-04-10, JORGE MALDONADO <jorgemal1960(at)gmail(dot)com> wrote:
> --000e0ce0d2ee43edb104bd553408
> Content-Type: text/plain; charset=ISO-8859-1
>
> I have a table with a varchar field, such a field is HTML ENCODED. So, for
> example, the string "PLAIN WHITE T'S" is saved as "PLAIN WHITE
> T&#39;&#39;S" (double quotes are not part of the string, I use them for
> clarity only). I need to perform a SELECT statement on this table and get
> the values HTML DECODED and I wonder if there is a function that I can
> include in such a statement for this purpose, for example "SELECT
> htmldecode(fld1) FROM table1". I will appreciate anu comments about my
> issue.

if you don't mind gettin an exception or the wrong answer on invalid
input you can abuse xpath thusly:

with sample as ( values ('m&#97;gic'),('s&amp;witch'),('to&#x61;ster'))
select
column1 as input ,
(xpath('/z/text()', ('<z>'|| column1 ||'</z>')::xml))[1] as output
from sample

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