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Encoding and result string length
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* Encoding and result string length
@ 2004-04-08 09:32  kumar <sgnerd@yahoo.com.sg>
  0 siblings, 1 reply; 2+ messages in thread

From: kumar @ 2004-04-08 09:32 UTC (permalink / raw)
  To: pgsql-sql

Dear Friends,

Postgres 7.3.2 on Linux 8

I would like to fetch the datas from a table in a encoded format. 

create table encodeco(c1 int4, c2 int4);
insert into encodeco values(10000, 20000);
select * from encodeco;

So I want to encode the data while selecting.
select encode(c1,'base64') from encodeco;

ERROR:  Function encode(integer, "unknown") does not exist
 Unable to identify a function that satisfies the given argument types
 You may need to add explicit typecasts

So i  tried
    select encode('c1','base64') from encodeco;
    
I got a result as
    1     YzE=

But this is the encoded value for 'c1' and not for the value 10000. 

Please shed some light.

Also is it possible to get the encoded values with only 2 charactors, irrespective of the values of c1 ranging from 100 to 10 million

Thanks
Kumar

^ permalink  raw  reply  [nested|flat] 2+ messages in thread

* Re: Encoding and result string length
@ 2004-04-08 11:00  Richard Huxton <dev@archonet.com>
  parent: kumar <sgnerd@yahoo.com.sg>
  0 siblings, 0 replies; 2+ messages in thread

From: Richard Huxton @ 2004-04-08 11:00 UTC (permalink / raw)
  To: kumar <sgnerd@yahoo.com.sg>; pgsql-sql

On Thursday 08 April 2004 10:32, kumar wrote:
>
> create table encodeco(c1 int4, c2 int4);
> insert into encodeco values(10000, 20000);
> select * from encodeco;
>
> So I want to encode the data while selecting.
> select encode(c1,'base64') from encodeco;

> So i  tried
>     select encode('c1','base64') from encodeco;

Not quite:
  SELECT encode(c1::text, 'base64') FROM encodeco;
or
  SELECT encode(CAST(c1 AS text), 'base64') FROM encodeco;

> Also is it possible to get the encoded values with only 2 charactors,
> irrespective of the values of c1 ranging from 100 to 10 million

You could write such a coding so long as you don't mind having ten-thousand 
characters in your character-set. Of course, character does not equal byte 
like this, but that's true in the various unicode systems anyway.

-- 
  Richard Huxton
  Archonet Ltd



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