How to give \COPY inside a function

On 08/16/11 8:07 AM, Siva Palanisamy wrote:

I want to \COPY over COPY command as I am not running as a super/admin
user. How to add \COPY command inside a function.

The following statement inside a function throws error.

\COPY xsa.export_table TO 'export.csv' DELIMITERS ',' CSV HEADER

Errors are throwing at “\COPY” and no semi-colon at the end of the
line. Please guide me.

\COPY is a psql metacommand, not a proper SQL command, its translated to
a SQL COPY command. you can't use \ commands in functions, so you'll
need to recode that as a COPY ... TO STDOUT ...; and recieve the stdout
stream and write it to your file (which is what the \COPY command is doing).

--
john r pierce N 37, W 122
santa cruz ca mid-left coast

Hi John,

I can understand that we can't use \COPY command directly in a function. Could you please brief me your alternative solution with a sample piece of code or any useful link?

Thanks and Regards,
Siva.

-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of John R Pierce
Sent: Tuesday, August 16, 2011 8:44 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] How to give \COPY inside a function

On 08/16/11 8:07 AM, Siva Palanisamy wrote:

I want to \COPY over COPY command as I am not running as a super/admin
user. How to add \COPY command inside a function.

The following statement inside a function throws error.

\COPY xsa.export_table TO 'export.csv' DELIMITERS ',' CSV HEADER

Errors are throwing at "\COPY" and no semi-colon at the end of the
line. Please guide me.

\COPY is a psql metacommand, not a proper SQL command, its translated to
a SQL COPY command. you can't use \ commands in functions, so you'll
need to recode that as a COPY ... TO STDOUT ...; and recieve the stdout
stream and write it to your file (which is what the \COPY command is doing).

--
john r pierce N 37, W 122
santa cruz ca mid-left coast

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Hi John,

I would like to add that I was not given the super user privilege to perform COPY command. If so, I wouldn't see \COPY command at all! Could you please guide me briefly on how to use \COPY command for my usage to write the output into a .CSV file inside a function?

Thanks and Regards,
Siva.

-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Siva Palanisamy
Sent: Wednesday, August 17, 2011 10:25 AM
To: John R Pierce; pgsql-general@postgresql.org
Subject: Re: [GENERAL] How to give \COPY inside a function

Hi John,

I can understand that we can't use \COPY command directly in a function. Could you please brief me your alternative solution with a sample piece of code or any useful link?

Thanks and Regards,
Siva.

-----Original Message-----
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of John R Pierce
Sent: Tuesday, August 16, 2011 8:44 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] How to give \COPY inside a function

On 08/16/11 8:07 AM, Siva Palanisamy wrote:

I want to \COPY over COPY command as I am not running as a super/admin
user. How to add \COPY command inside a function.

The following statement inside a function throws error.

\COPY xsa.export_table TO 'export.csv' DELIMITERS ',' CSV HEADER

Errors are throwing at "\COPY" and no semi-colon at the end of the
line. Please guide me.

\COPY is a psql metacommand, not a proper SQL command, its translated to
a SQL COPY command. you can't use \ commands in functions, so you'll
need to recode that as a COPY ... TO STDOUT ...; and recieve the stdout
stream and write it to your file (which is what the \COPY command is doing).

--
john r pierce N 37, W 122
santa cruz ca mid-left coast

--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general

::DISCLAIMER::
-----------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
It shall not attach any liability on the originator or HCL or its affiliates. Any views or opinions presented in
this email are solely those of the author and may not necessarily reflect the opinions of HCL or its affiliates.
Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of
this message without the prior written consent of the author of this e-mail is strictly prohibited. If you have
received this email in error please delete it and notify the sender immediately. Before opening any mail and
attachments please check them for viruses and defect.

-----------------------------------------------------------------------------------------------------------------------

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On 08/16/11 10:03 PM, Siva Palanisamy wrote:

Hi John,

I would like to add that I was not given the super user privilege to perform COPY command. If so, I wouldn't see \COPY command at all! Could you please guide me briefly on how to use \COPY command for my usage to write the output into a .CSV file inside a function?

a postgres function can not write a file, but it can execute a COPY ....
TO STDOUT ...; without superuser privilege.

your invoking application program would use whatever function in its
Postgres binding to read this 'stdout' data (its not really stdout),
like in C/C++ with libpq.so, you would use PQgetCopyData
http://www.postgresql.org/docs/current/static/libpq-copy.html#LIBPQ-COPY-RECEIVE
to receive this data stream, which you would write to a file via your
application

--
john r pierce N 37, W 122
santa cruz ca mid-left coast