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Re: Update with function

From: Adrian Klaver <adrian(dot)klaver(at)gmail(dot)com>
To: egbert(dot)bouwman(at)xs4all(dot)nl
Cc: psycopg(at)postgresql(dot)org
Subject: Re: Update with function
Date: 2012-03-30 16:05:04
Message-ID: 4F75D9B0.7060104@gmail.com (view raw or flat)
Thread:
Lists: psycopg
On 03/30/2012 09:02 AM, egbert wrote:
> On Fri, 2012-03-30 at 06:45 -0700, Adrian Klaver wrote:
>
>> A simple solution that demonstrates one way to do the above:
>>
>>
>> cur.execute("select recno from some_table")
>>
>> for row in cur:
>> 	recno = cur[0]
>> 	cur.execute("update books set inyear=%s", (makeyear(recno),))
>>
> Thanks for your suggestion, Adrian.
> Actually, that was something I tried first.
> But my some_table is about 165000 records, and it took nearly three
> hours (on my not so young system) to run the individual updates.
> So I looked for a one-pass solution.

Another option is write function in Postgres that does what you want and 
call that function.

> egbert
>


-- 
Adrian Klaver
adrian(dot)klaver(at)gmail(dot)com

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