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--
-- Cursors
--
-- These tests require track_utility to be enabled.
SET pg_stat_statements.track_utility = TRUE;
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
t
(1 row)
-- DECLARE
-- SELECT is normalized.
DECLARE cursor_stats_1 CURSOR WITH HOLD FOR SELECT 1;
CLOSE cursor_stats_1;
DECLARE cursor_stats_1 CURSOR WITH HOLD FOR SELECT 2;
CLOSE cursor_stats_1;
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
calls | rows | query
-------+------+-------------------------------------------------------
2 | 0 | CLOSE cursor_stats_1
2 | 0 | DECLARE cursor_stats_1 CURSOR WITH HOLD FOR SELECT $1
1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(3 rows)
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
t
(1 row)
-- FETCH
BEGIN;
DECLARE cursor_stats_1 CURSOR WITH HOLD FOR SELECT 2;
DECLARE cursor_stats_2 CURSOR WITH HOLD FOR SELECT 3;
FETCH 1 IN cursor_stats_1;
?column?
----------
2
(1 row)
FETCH 1 IN cursor_stats_2;
?column?
----------
3
(1 row)
CLOSE cursor_stats_1;
CLOSE cursor_stats_2;
COMMIT;
SELECT calls, rows, query FROM pg_stat_statements ORDER BY query COLLATE "C";
calls | rows | query
-------+------+-------------------------------------------------------
1 | 0 | BEGIN
1 | 0 | CLOSE cursor_stats_1
1 | 0 | CLOSE cursor_stats_2
1 | 0 | COMMIT
1 | 0 | DECLARE cursor_stats_1 CURSOR WITH HOLD FOR SELECT $1
1 | 0 | DECLARE cursor_stats_2 CURSOR WITH HOLD FOR SELECT $1
1 | 1 | FETCH $1 IN cursor_stats_1
1 | 1 | FETCH $1 IN cursor_stats_2
1 | 1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(9 rows)
SELECT pg_stat_statements_reset() IS NOT NULL AS t;
t
---
t
(1 row)
-- Normalization of FETCH statements
BEGIN;
DECLARE pgss_cursor CURSOR FOR SELECT FROM generate_series(1, 10);
-- implicit directions
FETCH pgss_cursor;
--
(1 row)
FETCH 1 pgss_cursor;
--
(1 row)
FETCH 2 pgss_cursor;
--
(2 rows)
FETCH -1 pgss_cursor;
--
(1 row)
-- explicit NEXT
FETCH NEXT pgss_cursor;
--
(1 row)
-- explicit PRIOR
FETCH PRIOR pgss_cursor;
--
(1 row)
-- explicit FIRST
FETCH FIRST pgss_cursor;
--
(1 row)
-- explicit LAST
FETCH LAST pgss_cursor;
--
(1 row)
-- explicit ABSOLUTE
FETCH ABSOLUTE 1 pgss_cursor;
--
(1 row)
FETCH ABSOLUTE 2 pgss_cursor;
--
(1 row)
FETCH ABSOLUTE -1 pgss_cursor;
--
(1 row)
-- explicit RELATIVE
FETCH RELATIVE 1 pgss_cursor;
--
(0 rows)
FETCH RELATIVE 2 pgss_cursor;
--
(0 rows)
FETCH RELATIVE -1 pgss_cursor;
--
(1 row)
-- explicit FORWARD
FETCH ALL pgss_cursor;
--
(0 rows)
-- explicit FORWARD ALL
FETCH FORWARD ALL pgss_cursor;
--
(0 rows)
-- explicit FETCH FORWARD
FETCH FORWARD pgss_cursor;
--
(0 rows)
FETCH FORWARD 1 pgss_cursor;
--
(0 rows)
FETCH FORWARD 2 pgss_cursor;
--
(0 rows)
FETCH FORWARD -1 pgss_cursor;
--
(1 row)
-- explicit FETCH BACKWARD
FETCH BACKWARD pgss_cursor;
--
(1 row)
FETCH BACKWARD 1 pgss_cursor;
--
(1 row)
FETCH BACKWARD 2 pgss_cursor;
--
(2 rows)
FETCH BACKWARD -1 pgss_cursor;
--
(1 row)
-- explicit BACKWARD ALL
FETCH BACKWARD ALL pgss_cursor;
--
(6 rows)
COMMIT;
SELECT calls, query FROM pg_stat_statements ORDER BY query COLLATE "C";
calls | query
-------+--------------------------------------------------------------------
1 | BEGIN
1 | COMMIT
1 | DECLARE pgss_cursor CURSOR FOR SELECT FROM generate_series($1, $2)
3 | FETCH ABSOLUTE $1 pgss_cursor
1 | FETCH ALL pgss_cursor
1 | FETCH BACKWARD ALL pgss_cursor
4 | FETCH BACKWARD pgss_cursor
1 | FETCH FIRST pgss_cursor
1 | FETCH FORWARD ALL pgss_cursor
4 | FETCH FORWARD pgss_cursor
1 | FETCH LAST pgss_cursor
1 | FETCH NEXT pgss_cursor
1 | FETCH PRIOR pgss_cursor
3 | FETCH RELATIVE $1 pgss_cursor
4 | FETCH pgss_cursor
1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
(16 rows)
|