I want to export the data in a table of some PostgreSQL database to a csv file.
Since the standard copy command does not work, I tried the following:
\copy (SELECT * FROM persons) to 'C:\tmp\persons_client.csv' with csv
just as in
http://www.postgresqltutorial.com/export-postgresql-table-to-csv-file/ .
The path seems to be correct; however, I get the error message
FEHLER: Syntaxfehler bei »\«
LINE 1: \copy [...]
which means that there is a syntax error at the "\" sign before the copy statement.
Any ideas what I missed?
By the way, this is not the real problem I'm currently facing.
Actually I was trying to import a csv file but unfortunately I do not seem to have sufficient privileges and when just using "COPY", the permission will be denied. so I tried to import the file using "\copy" but still get the same error message I get when trying to export using "\copy".
\copy (SELECT * FROM persons) to 'C:\tmp\persons_client.csv' with csv would not work in pgAdmin, because \copy is an pslq metacommand:
Performs a frontend (client) copy. This is an operation that runs an
SQL COPY command, but instead of the server reading or writing the
specified file, psql reads or writes the file and routes the data
between the server and the local file system. This means that file
accessibility and privileges are those of the local user, not the
server, and no SQL superuser privileges are required.
Issue this command on PgAdmin or psql:
COPY (SELECT * FROM persons) to 'C:\\tmp\\persons_client.csv' with csv;
Don't forget to escape Windows file separator.
\COPY (SELECT * FROM persons) to 'persons_client.csv' with csv;
Related
I am trying to import data from a csv file into a table in my DB, but keep getting an error.
SQL QUERY
BEGIN;
Copy csv_geometry_tamplate(facility_gis_number,facility_geometry)
from '/home/developer/tmp/facility_Polygon_testing.csv'
DELIMITER ','
CSV HEADER;
COMMIT;
{code}
ERROR: could not open file "/home/developer/tmp/facility_Polygon_testing.csv" for reading: Permission denied
HINT: COPY FROM instructs the PostgreSQL server process to read a file. You may want a client-side facility such as psql's \copy.
It seems that the user access DB for location /home/developer/tmp/ did not have access permission.
I moved the file to /tmp/facility_Polygon_testing.csv, then changed permissions with chmod 777. This seem to have solved the issue.
I'm familiarizing myself with the standalone version of Datagrip and having a bit of trouble understanding the different approaches to composing SQL via console, external files, scratch files, etc.
I'm managing, referencing the documentation, and am happy to figure things out as such.
However, I'm trying to ingest CSV data into tables via batch files using the Postgres \copy command. Datagrip will execute this command without error but no data is being populated.
This is my syntax, composed and ran in the console view:
\copy tablename from 'C:\Users\username\data_file.txt' WITH DELIMITER E'\t' csv;
Note that the data is tab-separated and stored in a .txt file.
I'm able to use the import functions of Datagrip (via context menu) just fine but I'd like to understand how to issue commands to do similarly.
\copy is a command of the command-line PostgreSQL client psql.
I doubt that Datagrip invokes psql, so it won't be able to use \copy or any other “backslash command”.
You probably have to use Datagrip's import facilities. Or you start using psql.
Ok, but what about the SQL COPY command https://www.postgresql.org/docs/12/sql-copy.html ?
How can I run something like that with datagrip ?
BEGIN;
CREATE TEMPORARY TABLE temp_json(values text) ON COMMIT DROP;
COPY temp_json FROM 'MY_FILE.JSON';
SELECT values->>'aJsonField' as f
FROM (select values::json AS values FROM temp_json) AS a;
COMMIT;
I try to replace 'MY_FILE.JSON' with full path, parameter (?), I put it in sql directory etc.
The data grip answer is :
[2021-05-05 10:30:45] [58P01] ERROR: could not open file '...' for reading : No such file or directory
EDIT :
I know why. RTFM! -_-
COPY with a file name instructs the PostgreSQL server to directly read from or write to a file. The file must be accessible by the PostgreSQL user (the user ID the server runs as) and the name must be specified from the viewpoint of the server.
Sorry.....
I tried to make a variable in SQL statement in Postgresql, but it did not work.
There are many csv files stored under the path. I want to set path in Postgresql that can tell copy command where can find csv files.
SQL statement sample:
\set outpath '/home/clients/ats-dev/'
\COPY licenses (_id, name,number_seats ) FROM :outpath + 'licenses.csv' CSV HEADER DELIMITER ',';
\COPY uploaded_files (_id, added_date ) FROM :outpath + 'files.csv' CSV HEADER DELIMITER ',';
It did not work. I got error: no such files. The two files licneses.csv and files.csv are stored under /home/cilents/ats-dev on Ubuntu. I found some sultion that use "\set file 'license.csv'". It did not work for me becacuse I have many csv files. also I tried to use "from : outpath || 'licenses.csv'". it did not work ether. Appreciate for any helps.
Using 9.3.
It looks like psql does not support :variable substitution withinpsql backslash commands.
test=> \set somevar fred
test=> \copy z from :somevar
:somevar: No such file or directory
so you will need to do this via an external tool like the unix shell. e.g.
for f in *.sql; do
psql -c "\\copy $(basename $f) FROM '$f'"
done
You can try COPY command
\set outpath '\'/home/clients/ats-dev/'
COPY licenses (_id, name,number_seats ) FROM :outpath/licenses.csv' WITH CSV HEADER DELIMITER ',';
COPY uploaded_files (_id, added_date ) FROM :outpath/files.csv' WITH CSV HEADER DELIMITER ',';
Note: Files named in a COPY command are read or written directly by the server, not by the client application. Therefore, they must reside on or be accessible to the database server machine, not the client. They must be accessible to and readable or writable by the PostgreSQL user (the user ID the server runs as), not the client. Similarly, the command specified with PROGRAM is executed directly by the server, not by the client application, must be executable by the PostgreSQL user. COPY naming a file or command is only allowed to database superusers, since it allows reading or writing any file that the server has privileges to access.
Documentation: Postgresql 9.3 COPY
It may have been true when this was originally asked, that psql backslash commands didn't support variable interpolation, but in my PostgreSQL 14 instance that's no longer the case. However, the psql manpage is clear that \copy specifically does not support variable interpolation.
we can use
copy (select * from mytbl) to 'D:/products.csv' with csv header
to import data in mytbl to local disk D
so is it possible to use the same method to upload the file directly into a FTP-Server ?
i tried like this
copy (select * from mytbl) to 'ftp://usrname:mypasswrd#ftp.drivehq.com/masters/3/product/products.csv' with csv header
but got this error
ERROR: relative path not allowed for COPY to file
SQL state: 42602
using PostgreSQL 9.2
PostgreSQL does not support any source/destination for COPY other than a file or stdin/stdout.
What you can do is COPY to stdout and pipe that to a program that writes the data to the ftp dir. psql's \copy is useful for this:
psql -c "\copy mytable to stdout with (format csv, header)" | ncftpput -c my.ftp.host /path/on/host
You can use any tool that accepts the input data on a pipe to write to the remote ftp file; ncftpput is just one option.
A future PostgreSQL version may add support for invoking COPY with a pipe, e.g. COPY ... TO '|/some/command', but there are serious security concerns with running programs under the PostgreSQL user that would make this a superuser-only operation and of questionable safety even then. It's much safer to run the program client-side, and psql is ideal for that.
I tried to import csv file data into postgres table. Running the following line as pgscript in pgAdmin
\copy users_page_rank FROM E'C:\\Users\\GamulinN\\Desktop\\users page rank.csv' DELIMITER ';' CSV
it returned an error:
[ERROR ] 1.0: syntax error, unexpected character
Does anyone know what could be wrong here? I checked this post but couldn't figure out what's the problem.
To import file into postgres with COPY you need one of the following:
1) Connect with psql to the DB and run your comand:
\copy users_page_rank FROM E'C:\\Users\\GamulinN\\Desktop\\users page rank.csv' DELIMITER ';' CSV
It will copy the file from current computer to the table. Details here.
2) Connect with any tool to the DB and run this SQL script:
COPY users_page_rank FROM E'C:\\Users\\GamulinN\\Desktop\\users page rank.csv' DELIMITER ';' CSV
It will copy the file from the server with postgres to the table. Details here. (With this command you can only COPY from files in postgresql data directory. So you will need to transfer files there first.)