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PG-193: Comment based tags to identify different parameters.

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Ibrar Ahmed 2021-05-19 22:17:07 +05:00 committed by GitHub
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@ -447,3 +447,80 @@ postgres=# SELECT substr(query,0,50), query_plan from pg_stat_monitor limit 10;
(10 rows) (10 rows)
``` ```
#### SQL Commenter / tags.
```sql
CREATE EXTENSION hstore;
CREATE FUNCTION text_to_hstore(s text) RETURNS hstore AS $$
BEGIN
RETURN hstore(s::text[]);
EXCEPTION WHEN OTHERS THEN
RETURN NULL;
END; $$ LANGUAGE plpgsql STRICT;
postgres=# SELECT 1 AS num /* { "application", java_app, "real_ip", 192.168.1.1} */;
num
-----
1
(1 row)
postgres=# SELECT 1 AS num1,2 AS num2 /* { "application", java_app, "real_ip", 192.168.1.2} */;
num1 | num2
------+------
1 | 2
(1 row)
postgres=# SELECT 1 AS num1,2 AS num2, 3 AS num3 /* { "application", java_app, "real_ip", 192.168.1.3} */;
num1 | num2 | num3
------+------+------
1 | 2 | 3
(1 row)
postgres=# SELECT 1 AS num1,2 AS num2, 3 AS num3, 4 AS num4 /* { "application", psql_app, "real_ip", 192.168.1.3} */;
num1 | num2 | num3 | num4
------+------+------+------
1 | 2 | 3 | 4
(1 row)
postgres=# select query, text_to_hstore(comments) as comments_tags from pg_stat_monitor;
query | comments_tags
---------------------------------------------------------------------------------------------------------------+-----------------------------------------------------
SELECT $1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3) */ | "real_ip"=>"192.168.1.1", "application"=>"java_app"
SELECT pg_stat_monitor_reset(); |
select query, comments, text_to_hstore(comments) from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2, $3 AS num3 /* { "application", java_app, "real_ip", 192.168.1.3} */ | "real_ip"=>"192.168.1.3", "application"=>"java_app"
select query, text_to_hstore(comments) as comments_tags from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2 /* { "application", java_app, "real_ip", 192.168.1.2} */ | "real_ip"=>"192.168.1.2", "application"=>"java_app"
SELECT $1 AS num1,$2 AS num2, $3 AS num3, $4 AS num4 /* { "application", psql_app, "real_ip", 192.168.1.3} */ | "real_ip"=>"192.168.1.3", "application"=>"psql_app"
(7 rows)
postgres=# select query, text_to_hstore(comments)->'application' as application_name from pg_stat_monitor;
query | application_name
---------------------------------------------------------------------------------------------------------------+----------
SELECT $1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3) */ | java_app
SELECT pg_stat_monitor_reset(); |
select query, text_to_hstore(comments)->"real_ip" as comments_tags from pg_stat_monitor; |
select query, text_to_hstore(comments)->$1 from pg_stat_monitor |
select query, text_to_hstore(comments) as comments_tags from pg_stat_monitor; |
select query, text_to_hstore(comments)->"application" as comments_tags from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2 /* { "application", java_app, "real_ip", 192.168.1.2} */ | java_app
SELECT $1 AS num1,$2 AS num2, $3 AS num3 /* { "application", java_app, "real_ip", 192.168.1.3} */ | java_app
select query, comments, text_to_hstore(comments) from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2, $3 AS num3, $4 AS num4 /* { "application", psql_app, "real_ip", 192.168.1.3} */ | psql_app
(10 rows)
postgres=# select query, text_to_hstore(comments)->'real_ip' as real_ip from pg_stat_monitor;
query | real_ip
---------------------------------------------------------------------------------------------------------------+-------------
SELECT $1 AS num /* { "application", psql_app, "real_ip", 192.168.1.3) */ | 192.168.1.1
SELECT pg_stat_monitor_reset(); |
select query, text_to_hstore(comments)->"real_ip" as comments_tags from pg_stat_monitor; |
select query, text_to_hstore(comments)->$1 from pg_stat_monitor |
select query, text_to_hstore(comments) as comments_tags from pg_stat_monitor; |
select query, text_to_hstore(comments)->"application" as comments_tags from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2 /* { "application", java_app, "real_ip", 192.168.1.2} */ | 192.168.1.2
SELECT $1 AS num1,$2 AS num2, $3 AS num3 /* { "application", java_app, "real_ip", 192.168.1.3} */ | 192.168.1.3
select query, comments, text_to_hstore(comments) from pg_stat_monitor; |
SELECT $1 AS num1,$2 AS num2, $3 AS num3, $4 AS num4 /* { "application", psql_app, "real_ip", 192.168.1.3} */ | 192.168.1.3
(10 rows)
```