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Add pg_sequences view

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Like pg_tables, pg_views, and others, this view contains information
about sequences in a way that is independent of the system catalog
layout but more comprehensive than the information schema.

To help implement the view, add a new internal function
pg_sequence_last_value() to return the last value of a sequence.  This
is kept separate from pg_sequence_parameters() to separate querying
run-time state from catalog-like information.

Reviewed-by: Andreas Karlsson <andreas@proxel.se>
This commit is contained in:
Peter Eisentraut
2016-11-18 12:00:00 -05:00
parent 8f91f323b4
commit 67dc4ccbb2
10 changed files with 233 additions and 10 deletions
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13
src/test/regress/sql/sequence.sql
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@ -138,12 +138,23 @@ SELECT nextval('sequence_test2');
SELECT nextval('sequence_test2');
SELECT nextval('sequence_test2');
CREATE SEQUENCE sequence_test3; -- not read from, to test is_called
-- Information schema
SELECT * FROM information_schema.sequences WHERE sequence_name IN
('sequence_test2', 'serialtest2_f2_seq', 'serialtest2_f3_seq',
('sequence_test2', 'sequence_test3', 'serialtest2_f2_seq', 'serialtest2_f3_seq',
'serialtest2_f4_seq', 'serialtest2_f5_seq', 'serialtest2_f6_seq')
ORDER BY sequence_name ASC;
SELECT schemaname, sequencename, start_value, min_value, max_value, increment_by, cycle, cache_size, last_value
FROM pg_sequences
WHERE sequencename IN
('sequence_test2', 'sequence_test3', 'serialtest2_f2_seq', 'serialtest2_f3_seq',
'serialtest2_f4_seq', 'serialtest2_f5_seq', 'serialtest2_f6_seq')
ORDER BY sequencename ASC;
-- Test comments
COMMENT ON SEQUENCE asdf IS 'won''t work';
COMMENT ON SEQUENCE sequence_test2 IS 'will work';