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List:       postgresql-general
Subject:    Re: [GENERAL] Generic timestamp function for updates where field
From:       novnov <novnovice () gmail ! com>
Date:       2006-12-31 18:32:26
Message-ID: 8108979.post () talk ! nabble ! com
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Thanks Adrian, I'll see what I can do with that, I'll learn a lot by going
through what you've done.


Adrian Klaver wrote:
> 
> On Sunday 31 December 2006 8:48 am, novnov wrote:
> > OK. python would be the preference, if anyone is interested in showing me
> > how it would be done, I've never used one of the dynamic languages with
> > postgres.
> > 
> > Why would not be possible in plpgsql? It has loop etc, the only part I'm
> > not sure it can do it use the variable as field name.
> > 
> 
> > > http://archives.postgresql.org/
> Here is a function I wrote in python to do something similar.  My
> timestamp 
> fields are of the form tc_ts_update where tc is  a table code that can be 
> found by looking up the table name in the table_code table. In pl/pythonu 
> that ships with 8.2 it is no longer necessary to do the relid look up. 
> There 
> is a TD["table_name"] variable that returns the table name directly.
> 
> CREATE OR REPLACE FUNCTION public.ts_update()
> RETURNS trigger AS
> $Body$
> table_oid=TD["relid"]
> plan_name=plpy.prepare("SELECT relname FROM pg_class WHERE
> oid=$1",["oid"])
> plan_code=plpy.prepare("SELECT tc_table_code FROM table_code WHERE 
> tc_table_name=$1",["text"])
> rs_name=plpy.execute(plan_name,[table_oid])
> rs_code=plpy.execute(plan_code,[rs_name[0]["relname"]])
> fld_name="_ts_update"
> tbl_code=rs_code[0]["tc_table_code"]
> full_name=tbl_code+fld_name
> TD["new"][full_name]="now()"
> return "MODIFY"
> $Body$
> LANGUAGE plpythonu SECURITY DEFINER;
> -- 
> Adrian Klaver
> aklaver@comcast.net
> 
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> 

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