Re: raw output from copy

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От Pavel Stehule
Тема Re: raw output from copy
Дата
Msg-id CAFj8pRADj=iCnvw4ztyxK4zf9Ym_ETG13CMDOambGBL8TBZpCg@mail.gmail.com
обсуждение исходный текст
Ответ на Re: raw output from copy  (Pavel Stehule <pavel.stehule@gmail.com>)
Ответы Re: raw output from copy  (Michael Paquier <michael.paquier@gmail.com>)
Список pgsql-hackers
Hi

2016-04-05 10:45 GMT+02:00 Pavel Stehule <pavel.stehule@gmail.com>:
Hi

here is cleaned/finished previous implementation of RAW_TEXT/RAW_BINARY formats for COPY statements.

The RAW with text formats means unescaped data, but with correct encoding - input/output is realised with input/output function. RAW binary means content produced/received by sending/received functions.

Now both directions (input/output) working well

Some examples of expected usage:

copy (select xmlelement(name foo, 'hello')) to stdout (format raw_binary, encoding 'latin2');

create table avatars(id serial, picture bytea);
\copy avatars(picture) from ~/images/foo.jpg (format raw_binary);
select lastval();

create table doc(id serial, txt text);
\copy doc(txt) from ~/files/aaa.txt (format raw_text, encoding 'latin2');
select lastval();

Regards

Pavel


I am sending fresh version of COPY RAW patch.

There is new regress client test requested by Tom.

Note: I though about another solution based on binary parameters and binary result support in psql. Somelike:

INSERT INTO foo(a) VALUES($1)
\gpush filename

SELECT a FROM foo
\gpop filename

but, it is less intuitive, and doesn't work with stdin/stdout - so it is significant week against COPY based solution for scripting from shell. More \g***** solution is still possible if will be requested in future.

Regards

Pavel

[pavel@nemesis ~]$ cat avatar.gif | psql -Xq -At -c "copy xx(b) from stdin (format raw_text)" -c "select lastval()" postgres
313

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