topic Re: Executing \COPY command against Amazon RDS Postgres in Talend Studio

Executing \COPY command against Amazon RDS Postgres

radhikari — Sat, 16 Nov 2024 08:41:49 GMT

Hello,

I am trying to use the "\COPY" command bulk load a CSV file into Amazon RDS Postgres instance.

Here is the command I am using:

\copy nch.bulk_test from 'out.csv' with DELIMITER ';'

When I execute this use a psql client, I had no issues. I was able to load 10,000,000 records very quickly.

However, when I try to execute this command using the tPostgresqlRow component, I get a "ERROR: syntax error at or near "\""

And I have escaped the back slash and the single quotes using the tJava component as follows:

String copy_command = "\\copy bulk_test from \'out.csv\' with DELIMITER \';\'";
context.copy_command = copy_command;

I am simply calling context.copy_command using the tPostgresRow component.

Any suggestions on what I am doing wrong?

Re: Executing \COPY command against Amazon RDS Postgres

vapukov — Wed, 14 Feb 2018 20:42:01 GMT

You need escape only \

context.copy_command = "\\copy nch.bulk_test from 'out.csv' with DELIMITER ';'";

or just in tPostgreSQLRow

"\\copy nch.bulk_test from 'out.csv' with DELIMITER ';'";

Re: Executing \COPY command against Amazon RDS Postgres

radhikari — Wed, 14 Feb 2018 20:46:05 GMT

Tried that, I still get ERROR: syntax error at or near "\"

Re: Executing \COPY command against Amazon RDS Postgres

vapukov — Wed, 14 Feb 2018 20:51:28 GMT

on AWS I have only Redshift, but on Azure I use just COPY

test it without \

Re: Executing \COPY command against Amazon RDS Postgres

radhikari — Wed, 14 Feb 2018 20:55:20 GMT

COPY works well for Redshift and I don't have experience with Azure.

COPY doesn't work for Postgres RDS since it's expecting the csv to be local on the database server which is not possible with RDS. That's why Amazon recommends \COPY instead.

Re: Executing \COPY command against Amazon RDS Postgres

vapukov — Wed, 14 Feb 2018 21:45:13 GMT

and this why it can not be executed:

COPY - it is SQL command
\copy - it is psql command

in this case - You need use tSystem and call psql rather then tPostgeSQLRow

and You can test tRDSPostgresqlBulkExe component from community - https://exchange.talend.com/#marketplaceproductoverview:marketplace=marketplace%252F1&p=marketplace%252F1%252Fproducts%252F1570&pi=marketplace%252F1%252Fproducts%252F1570%252Fitems%252F2709