IDS Forum

Re: Random name for temp table

Posted By: Marcus Haarmann
Date: Thursday, 20 March 2014, at 2:25 p.m.

In Response To: Re: Random name for temp table (VIKAS HIVARKAR)

create sequence seq_vikas;

DEFINE number as Integer;

select seq_vikas.nextval into number from sysdual;

... proceed as indicated using dynamic ddl.

Best regards,

Marcus Haarmann

----- Ursprüngliche Mail -----

Von: "VIKAS HIVARKAR" <vikas.hivarkar@gmail.com>
An: ids@iiug.org
Gesendet: Donnerstag, 20. März 2014 19:16:34
Betreff: Re: Random name for temp table [32758]

Hi Art,

Your solution is simply genius, I am just thinking if the developer is opening
one session and all the users are using that session that could it be possible
that the parent session established with database remains the same and hence
the session id remains the same, In such case the vikas_<sessionid> will
remain same.

I am just simulating the scenario and will check the results.

The SP takes a integer as passed by the users and I though of using that in
the table name because it is unlikely (but still possible) that the user
searches for the same integer

> drop procedure create_tab (integer);

Routine dropped.

> CREATE PROCEDURE create_tab (table_name integer)
> DEFINE l_crtstmt CHAR(1024);
> LET l_crtstmt = "CREATE TEMP TABLE vikas_" ||table_name|| "(col1 integer)";
> EXECUTE IMMEDIATE l_crtstmt;
> END PROCEDURE;

Routine created.

> EXECUTE PROCEDURE create_tab (12345);

Routine executed.

> select count(*) from vikas_12345;

(count(*))

0

1 row(s) retrieved.

This is exactly what you suggested using dynamic prepare statement and will
use the integer as passed by the users but still not fool proof.

I dont know if there is a ready made function in v12 that gives me a random
number which is very unlikely to repeat in quick successions

Regards,
Vikas

============================================================================

create procedure make_temp() return lvarchar;
define sid bigint;
define tmp_stmt, tmpname lvarchar;

select dbinfo('sessionid') into sid from sysmaster:sysdual;

let tmpname = 'vikas_" || sid::lvarchar;

let tmp_stmt = "create temp table vikas_" || tmpname || " (v_sr_no
SMALLINT,v_label VARCHAR(200), v_text LVARCHAR(2000) default null) WITH NO
LOG";

execute immediate tmp_stmt;
return tmpname;

end procedure;

Art S. Kagel, Principal Consultant
ASK Database Management

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Thu, Mar 20, 2014 at 2:41 AM, VIKAS HIVARKAR
<vikas.hivarkar@gmail.com>wrote:

> Hi All,
>
> Informix 12.10.FC2 on HP Unix 11.31
>
> I have a stored procedure running file for 2 years which creates a temp
> table
> with no log
>
> CREATE TEMP TABLE vikas(
> v_sr_no SMALLINT,
> v_label VARCHAR(200),
> v_text LVARCHAR(2000) default null) WITH NO LOG;
>
> Now One of our developers have written a java code for GUI based
> application
> that calls this procedure and for some reasons he has used a single session
> polling login that opens a single session to the database and all the users
> use this session.
>
> There starts the trouble as the temp table is session based it cannot be
> used
> by mutiple users and the funtion fails
>
> Until the connection logic is fixed, Is there any way I can modify the
> stored
> procedure to create a temp table with random name instead of the hard coded
> "vikas" name
>
> I was looking for the funtion DBMS_RANDOM_RANDOM but not sure how to use it
> also there is "IF NOT EXISTS" but I dont know if it has any relevance with
> my
> issue.
>
> Regards,

*******************************************************************************
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Messages In This Thread

• Random name for temp table
  VIKAS HIVARKAR -- Thursday, 20 March 2014, at 2:41 a.m.
  • Re: Random name for temp table
    Marcus Haarmann -- Thursday, 20 March 2014, at 3:29 a.m.
  • Re: Random name for temp table
    Art Kagel -- Thursday, 20 March 2014, at 7:23 a.m.
    • Re: Random name for temp table
      VIKAS HIVARKAR -- Thursday, 20 March 2014, at 2:16 p.m.
      • Re: Random name for temp table
        Marcus Haarmann -- Thursday, 20 March 2014, at 2:25 p.m.
      • Re: Random name for temp table
        Art Kagel -- Thursday, 20 March 2014, at 2:30 p.m.
        • Re: Random name for temp table
          VIKAS HIVARKAR -- Thursday, 20 March 2014, at 4:03 p.m.
          • Re: Random name for temp table
            Art Kagel -- Thursday, 20 March 2014, at 4:29 p.m.

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