Обсуждение: insert more than one rows
Hi,
I'm using Pgsql 8.1 in my project and I have to insert more than one rows with one sql query as the insert commmand slows a lot the server and comsumes too much resources. I have read some older mails about this and most of them recommended to use COPY command but the thing is I don't have a chance to create a file. I have a php form which takes data and then execute some queries after the submit. I will have probably 100 rows maximum (just a guess). It wont slow down a lot, but I want to find and use a better alternative than to use a for statement to insert datas.
In some of the mails someone had talked about to use the copy's stdout command. But I can't honestly say that I understood clearly how to use it.
I don't want to create a file with php and then populate and then use the copy command by that as it will be more problematic. So what do you suggest? Can I use the COPY command without pointing a file? Or can I point a string variable to use it as source while the delimeter is something else than the tab character (the | character perhaps). Or can I point a string array simply? (When i say point i mean to use it as datasource. Sorry for my bad english)
Thank you for your time
Roy Simkes
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am 28.06.2006, um 7:59:44 +0000 mailte roy simkes folgendes: > Hi,I'm using Pgsql 8.1 in my project and I have to insert more than > one rows with one sql query as the insert commmand slows a lot the > server and comsumes too much resources. I have read some older mails > about this and most of them recommended to use COPY command but the > thing is I don't have a chance to create a file. I have a php form Read this: http://people.planetpostgresql.org/greg/index.php?/archives/56-Inserting-multiple-rows-in-a-single-statement.html HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe ===
On 6/28/06, roy simkes <roysimkes@hotmail.com> wrote:
> Can I use the COPY command without pointing a file? Or can I point a string
> variable to use it as source while the delimeter is something else than the
> tab character (the | character perhaps). Or can I point a string array
> simply? (When i say point i mean to use it as datasource. Sorry for my bad
> english)
Another alternative to the suggestion in the link Andreas provided
might be to use the COPY FROM STDIN method;
If you have your query-results in an array of strings, separator a
pipe-symbol, for example, something like the following snippet might
work for you:
PQexec(conn, "CREATE TABLE foo (a int4, b char(16), d double precision)");
PQexec(conn, "COPY foo FROM STDIN DELIMITER AS '|'");
foreach ($my_results as &$value) {
PQputline(conn, $value);
}
PQputline(conn,"\\.\n");
PQendcopy(conn);
Cheers,
Andrej
--
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-----Original Message-----
From: pgsql-novice-owner@postgresql.org
[mailto:pgsql-novice-owner@postgresql.org] On Behalf Of Andrej
Ricnik-Bay
Sent: Wednesday, June 28, 2006 1:34 AM
To: pgsql-novice@postgresql.org
Subject: Re: [NOVICE] insert more than one rows
On 6/28/06, roy simkes <roysimkes@hotmail.com> wrote:
> Can I use the COPY command without pointing a file? Or can I point a
string
> variable to use it as source while the delimeter is something else
than the
> tab character (the | character perhaps). Or can I point a string array
> simply? (When i say point i mean to use it as datasource. Sorry for my
bad
> english)
Another alternative to the suggestion in the link Andreas provided
might be to use the COPY FROM STDIN method;
If you have your query-results in an array of strings, separator a
pipe-symbol, for example, something like the following snippet might
work for you:
PQexec(conn, "CREATE TABLE foo (a int4, b char(16), d double
precision)");
PQexec(conn, "COPY foo FROM STDIN DELIMITER AS '|'");
foreach ($my_results as &$value) {
PQputline(conn, $value);
}
PQputline(conn,"\\.\n");
PQendcopy(conn);
Cheers,
Andrej
--
Please don't top post, and don't use HTML e-Mail :} Make your quotes
concise.
http://www.american.edu/econ/notes/htmlmail.htm
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-----Original Message-----
Is there a way to do that without using deprecated libpq copy functions?
Thanks,
Josh
On 7/1/06, Garcia, Joshua <Joshua.Garcia@xerox.com> wrote:
>> PQexec(conn, "CREATE TABLE foo (a int4, b char(16), d double
>> precision)");
>> PQexec(conn, "COPY foo FROM STDIN DELIMITER AS '|'");
>> foreach ($my_results as &$value) {
>> PQputline(conn, $value);
>> }
>> PQputline(conn,"\\.\n");
>> PQendcopy(conn);
> Is there a way to do that without using deprecated libpq copy functions?
Ummm ... copy in that example is an SQL function.
http://www.postgresql.org/docs/8.1/interactive/sql-copy.html
Unless of course the PHP guys have made any of the sql statements
an implementation of libpq (in which case the answer to your
question would be no).
> Thanks,
> Josh
Cheers,
Andrej
Is it possible to assign a column name to a variable and then use that
variable in a SELECT statement inside a function using plpgsql?
For example:
CREATE OR REPLACE FUNCTION function_name("varchar")
RETURNS varchar AS
$BODY$
DECLARE
column_name alias for $1;
status varchar;
BEGIN
SELECT column_name INTO status FROM contact_table WHERE id = 1;
RETURN status;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
Thanks,
Derrick
am 30.06.2006, um 16:32:38 -0600 mailte Derrick Betts folgendes: > Is it possible to assign a column name to a variable and then use that > variable in a SELECT statement inside a function using plpgsql? Yes. You can define a string with your SQL, including variables. Thena you can EXECUTE this string. http://www.postgresql.org/docs/8.1/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN HTH, Andreas -- Andreas Kretschmer (Kontakt: siehe Header) Heynitz: 035242/47215, D1: 0160/7141639 GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net === Schollglas Unternehmensgruppe ===
Excellent! Thank you so much! I've been searching for this solution for a very long time. Your response is very much appreciated. Derrick ----- Original Message ----- From: "A. Kretschmer" <andreas.kretschmer@schollglas.com> To: <pgsql-novice@postgresql.org> Sent: Sunday, July 02, 2006 11:00 PM Subject: Re: [NOVICE] Column names as variables in plpgsql > am 30.06.2006, um 16:32:38 -0600 mailte Derrick Betts folgendes: >> Is it possible to assign a column name to a variable and then use that >> variable in a SELECT statement inside a function using plpgsql? > > Yes. You can define a string with your SQL, including variables. Thena > you can EXECUTE this string. > > http://www.postgresql.org/docs/8.1/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN > > > HTH, Andreas > -- > Andreas Kretschmer (Kontakt: siehe Header) > Heynitz: 035242/47215, D1: 0160/7141639 > GnuPG-ID 0x3FFF606C http://wwwkeys.de.pgp.net > === Schollglas Unternehmensgruppe === > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend > >