How to retrieve Comment text using SQL, not psql?

Hi

you can call function obj_description
http://stackoverflow.com/questions/11493978/how-to-retrieve-the-comment-of-a-postgresql-database

http://www.postgresql.org/docs/9.1/static/functions-info.html

For tables

SELECT pg_catalog.obj_description('tablename'::regclass, 'pg_class') as
"Description;

Regards

Pavel Stehule

2015-05-30 13:48 GMT+02:00 Bob Futrelle <bob.futrelle@gmail.com>:

This will give the comment on your table and any column:

SELECT DISTINCT ON (c.relname)
n.nspname as schema,
c.relname,
a.rolname as owner,
0 as col_seq,
'' as column,
d.description as comment
FROM pg_class c
LEFT JOIN pg_attribute col ON (col.attrelid = c.oid)
LEFT JOIN pg_description d ON (d.objoid = col.attrelid AND d.objsubid = 0)
JOIN pg_namespace n ON (n.oid = c.relnamespace)
JOIN pg_authid a ON ( a.OID = c.relowner )
WHERE n.nspname NOT LIKE 'information%'
AND relname NOT LIKE 'pg_%'
AND relname NOT LIKE 'information%'
AND relname NOT LIKE 'sql_%'
AND relname = 'articlestats'
AND relkind = 'r'
AND d.description IS NOT NULL
UNION
SELECT n.nspname as schema,
c.relname,
'' as owner,
col.attnum as col_seq,
col.attname as column,
d.description
FROM pg_class c
JOIN pg_attribute col ON (col.attrelid = c.oid)
LEFT JOIN pg_description d ON (d.objoid = col.attrelid AND d.objsubid =
col.attnum)
JOIN pg_namespace n ON (n.oid = c.relnamespace)
JOIN pg_authid a ON ( a.OID = c.relowner )
WHERE n.nspname NOT LIKE 'information%'
AND relname NOT LIKE 'pg_%'
AND relname NOT LIKE 'information%'
AND relname NOT LIKE 'sql_%'
AND relname = 'articlestats'
AND relkind = 'r'
AND d.description IS NOT NULL
AND col.attnum >= 0
ORDER BY 1, 2, 4;

Learn the catalogs and you will learn PostgreSQL!

On Sat, May 30, 2015 at 7:58 AM, Pavel Stehule <pavel.stehule@gmail.com>
wrote:

Hi

you can call function obj_description
http://stackoverflow.com/questions/11493978/how-to-retrieve-the-comment-of-a-postgresql-database

http://www.postgresql.org/docs/9.1/static/functions-info.html

For tables

SELECT pg_catalog.obj_description('tablename'::regclass, 'pg_class') as
"Description;

Regards

Pavel Stehule

2015-05-30 13:48 GMT+02:00 Bob Futrelle <bob.futrelle@gmail.com>:

Using pgAdmin3 I've tried this and variations on it. All are rejected.

select COMMENT ON TABLE articlestats

No answer here,

http://www.postgresql.org/docs/9.3/static/sql-comment.html

pgAdmin3 had no problem with entering a comment:

COMMENT ON TABLE articlestats IS 'Comprehensive data for every article.'

- Bob Futrelle

--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.

On 05/30/2015 04:48 AM, Bob Futrelle wrote:

Using pgAdmin3 I've tried this and variations on it. All are rejected.

select COMMENT ON TABLE articlestats

No answer here,

http://www.postgresql.org/docs/9.3/static/sql-comment.html

pgAdmin3 had no problem with entering a comment:

COMMENT ON TABLE articlestats IS 'Comprehensive data for every article.'

http://www.postgresql.org/docs/9.4/interactive/functions-info.html
Table 9.60 Comment Information Functions

So:

test=# comment on table table1 is 'Test comment';
COMMENT

test=# select obj_description('table1'::regclass, 'pg_class');
obj_description

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

Test comment

(1 row)

- Bob Futrelle

--
Adrian Klaver
adrian.klaver@aklaver.com

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

select obj_description('table1'::regclass, 'pg_class');

That will only show the table comment.
My query shows that table comment AND any column comments!

On Sat, May 30, 2015 at 9:37 AM, Adrian Klaver <adrian.klaver@aklaver.com>
wrote:

On 05/30/2015 04:48 AM, Bob Futrelle wrote:

Using pgAdmin3 I've tried this and variations on it. All are rejected.

select COMMENT ON TABLE articlestats

No answer here,

http://www.postgresql.org/docs/9.3/static/sql-comment.html

pgAdmin3 had no problem with entering a comment:

COMMENT ON TABLE articlestats IS 'Comprehensive data for every
article.'

http://www.postgresql.org/docs/9.4/interactive/functions-info.html
Table 9.60 Comment Information Functions

So:

test=# comment on table table1 is 'Test comment';
COMMENT

test=# select obj_description('table1'::regclass, 'pg_class');
obj_description

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

Test comment

(1 row)

- Bob Futrelle

--
Adrian Klaver
adrian.klaver@aklaver.com

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

--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.

Hi Bob:

On Sat, May 30, 2015 at 1:48 PM, Bob Futrelle <bob.futrelle@gmail.com> wrote:

Using pgAdmin3 I've tried this and variations on it. All are rejected.
select COMMENT ON TABLE articlestats

pgAdmin3 is a bit complex for me, bot on vanilla psql you can use the switch:

-E
--echo-hidden

Echo the actual queries generated by \d and other backslash commands.
You can use this to study psql's internal operations. This is
equivalent to setting the variable ECHO_HIDDEN to on.
<<<
to learn how it does them, and elaborate from there, Its a nice
resource ( although I fear its queries evolve with versions, but you
can always port them touse the information_schema (
http://www.postgresql.org/docs/9.4/static/information-schema.html )
which should be a little more stable.

Francisco Olarte.

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