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a6f22e8356
The trouble with the original choice here is that "?" is a valid (and indeed used) operator name, so that you could end up with ambiguous statement texts like "SELECT ? ? ?". With this patch, you instead see "SELECT $1 ? $2", which seems significantly more readable. The numbers used for this purpose begin after the last actual $N parameter in the particular query. The conflict with external parameters has its own potential for confusion of course, but it was agreed to be an improvement over the previous behavior. Lukas Fittl Discussion: https://postgr.es/m/CAP53PkxeaCuwYmF-A4J5z2-qk5fYFo5_NH3gpXGJJBxv1DMwEw@mail.gmail.com
399 lines
9.6 KiB
Plaintext
399 lines
9.6 KiB
Plaintext
CREATE EXTENSION pg_stat_statements;
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--
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-- simple and compound statements
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--
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SET pg_stat_statements.track_utility = FALSE;
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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SELECT 1 AS "int";
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int
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-----
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1
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(1 row)
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SELECT 'hello'
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-- multiline
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AS "text";
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text
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-------
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hello
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(1 row)
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SELECT 'world' AS "text";
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text
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-------
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world
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(1 row)
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-- transaction
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BEGIN;
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SELECT 1 AS "int";
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int
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-----
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1
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(1 row)
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SELECT 'hello' AS "text";
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text
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-------
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hello
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(1 row)
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COMMIT;
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-- compound transaction
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BEGIN \;
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SELECT 2.0 AS "float" \;
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SELECT 'world' AS "text" \;
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COMMIT;
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-- compound with empty statements and spurious leading spacing
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\;\; SELECT 3 + 3 \;\;\; SELECT ' ' || ' !' \;\; SELECT 1 + 4 \;;
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?column?
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----------
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5
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(1 row)
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-- non ;-terminated statements
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SELECT 1 + 1 + 1 AS "add" \gset
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SELECT :add + 1 + 1 AS "add" \;
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SELECT :add + 1 + 1 AS "add" \gset
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-- set operator
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SELECT 1 AS i UNION SELECT 2 ORDER BY i;
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i
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---
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1
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2
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(2 rows)
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-- ? operator
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select '{"a":1, "b":2}'::jsonb ? 'b';
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?column?
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----------
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t
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(1 row)
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-- cte
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WITH t(f) AS (
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VALUES (1.0), (2.0)
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)
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SELECT f FROM t ORDER BY f;
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f
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-----
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1.0
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2.0
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(2 rows)
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-- prepared statement with parameter
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PREPARE pgss_test (int) AS SELECT $1, 'test' LIMIT 1;
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EXECUTE pgss_test(1);
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?column? | ?column?
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----------+----------
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1 | test
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(1 row)
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DEALLOCATE pgss_test;
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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---------------------------------------------------+-------+------
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PREPARE pgss_test (int) AS SELECT $1, $2 LIMIT $3 | 1 | 1
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SELECT $1 +| 4 | 4
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+| |
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AS "text" | |
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SELECT $1 + $2 | 2 | 2
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SELECT $1 + $2 + $3 AS "add" | 3 | 3
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SELECT $1 AS "float" | 1 | 1
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SELECT $1 AS "int" | 2 | 2
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SELECT $1 AS i UNION SELECT $2 ORDER BY i | 1 | 2
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SELECT $1 || $2 | 1 | 1
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SELECT pg_stat_statements_reset() | 1 | 1
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WITH t(f) AS ( +| 1 | 2
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VALUES ($1), ($2) +| |
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) +| |
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SELECT f FROM t ORDER BY f | |
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select $1::jsonb ? $2 | 1 | 1
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(11 rows)
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--
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-- CRUD: INSERT SELECT UPDATE DELETE on test table
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--
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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-- utility "create table" should not be shown
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CREATE TEMP TABLE test (a int, b char(20));
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INSERT INTO test VALUES(generate_series(1, 10), 'aaa');
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UPDATE test SET b = 'bbb' WHERE a > 7;
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DELETE FROM test WHERE a > 9;
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-- explicit transaction
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BEGIN;
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UPDATE test SET b = '111' WHERE a = 1 ;
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COMMIT;
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BEGIN \;
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UPDATE test SET b = '222' WHERE a = 2 \;
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COMMIT ;
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UPDATE test SET b = '333' WHERE a = 3 \;
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UPDATE test SET b = '444' WHERE a = 4 ;
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BEGIN \;
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UPDATE test SET b = '555' WHERE a = 5 \;
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UPDATE test SET b = '666' WHERE a = 6 \;
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COMMIT ;
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-- many INSERT values
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INSERT INTO test (a, b) VALUES (1, 'a'), (2, 'b'), (3, 'c');
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-- SELECT with constants
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SELECT * FROM test WHERE a > 5 ORDER BY a ;
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a | b
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---+----------------------
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6 | 666
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7 | aaa
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8 | bbb
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9 | bbb
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(4 rows)
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SELECT *
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FROM test
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WHERE a > 9
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ORDER BY a ;
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a | b
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---+---
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(0 rows)
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-- SELECT without constants
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SELECT * FROM test ORDER BY a;
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a | b
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---+----------------------
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1 | a
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1 | 111
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2 | b
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2 | 222
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3 | c
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3 | 333
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4 | 444
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5 | 555
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6 | 666
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7 | aaa
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8 | bbb
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9 | bbb
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(12 rows)
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-- SELECT with IN clause
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SELECT * FROM test WHERE a IN (1, 2, 3, 4, 5);
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a | b
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---+----------------------
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1 | 111
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2 | 222
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3 | 333
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4 | 444
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5 | 555
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1 | a
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2 | b
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3 | c
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(8 rows)
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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-------------------------------------------------------------+-------+------
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DELETE FROM test WHERE a > $1 | 1 | 1
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INSERT INTO test (a, b) VALUES ($1, $2), ($3, $4), ($5, $6) | 1 | 3
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INSERT INTO test VALUES(generate_series($1, $2), $3) | 1 | 10
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SELECT * FROM test ORDER BY a | 1 | 12
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SELECT * FROM test WHERE a > $1 ORDER BY a | 2 | 4
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SELECT * FROM test WHERE a IN ($1, $2, $3, $4, $5) | 1 | 8
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SELECT pg_stat_statements_reset() | 1 | 1
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UPDATE test SET b = $1 WHERE a = $2 | 6 | 6
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UPDATE test SET b = $1 WHERE a > $2 | 1 | 3
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(9 rows)
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--
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-- pg_stat_statements.track = none
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--
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SET pg_stat_statements.track = 'none';
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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SELECT 1 AS "one";
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one
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-----
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1
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(1 row)
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SELECT 1 + 1 AS "two";
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two
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-----
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2
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(1 row)
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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-------+-------+------
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(0 rows)
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--
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-- pg_stat_statements.track = top
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--
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SET pg_stat_statements.track = 'top';
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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DO LANGUAGE plpgsql $$
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BEGIN
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-- this is a SELECT
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PERFORM 'hello world'::TEXT;
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END;
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$$;
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-- PL/pgSQL function
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CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
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DECLARE
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r INTEGER;
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BEGIN
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SELECT (i + 1 + 1.0)::INTEGER INTO r;
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RETURN r;
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END; $$ LANGUAGE plpgsql;
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SELECT PLUS_TWO(3);
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plus_two
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----------
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5
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(1 row)
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SELECT PLUS_TWO(7);
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plus_two
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----------
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9
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(1 row)
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-- SQL function --- use LIMIT to keep it from being inlined
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CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
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SELECT PLUS_ONE(8);
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plus_one
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----------
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9
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(1 row)
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SELECT PLUS_ONE(10);
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plus_one
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----------
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11
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(1 row)
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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-----------------------------------+-------+------
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SELECT $1::TEXT | 1 | 1
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SELECT PLUS_ONE($1) | 2 | 2
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SELECT PLUS_TWO($1) | 2 | 2
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SELECT pg_stat_statements_reset() | 1 | 1
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(4 rows)
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--
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-- pg_stat_statements.track = all
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--
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SET pg_stat_statements.track = 'all';
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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-- we drop and recreate the functions to avoid any caching funnies
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DROP FUNCTION PLUS_ONE(INTEGER);
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DROP FUNCTION PLUS_TWO(INTEGER);
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-- PL/pgSQL function
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CREATE FUNCTION PLUS_TWO(i INTEGER) RETURNS INTEGER AS $$
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DECLARE
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r INTEGER;
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BEGIN
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SELECT (i + 1 + 1.0)::INTEGER INTO r;
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RETURN r;
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END; $$ LANGUAGE plpgsql;
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SELECT PLUS_TWO(-1);
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plus_two
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----------
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1
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(1 row)
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SELECT PLUS_TWO(2);
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plus_two
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----------
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4
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(1 row)
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-- SQL function --- use LIMIT to keep it from being inlined
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CREATE FUNCTION PLUS_ONE(i INTEGER) RETURNS INTEGER AS
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$$ SELECT (i + 1.0)::INTEGER LIMIT 1 $$ LANGUAGE SQL;
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SELECT PLUS_ONE(3);
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plus_one
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----------
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4
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(1 row)
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SELECT PLUS_ONE(1);
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plus_one
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----------
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2
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(1 row)
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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-----------------------------------+-------+------
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SELECT (i + $2 + $3)::INTEGER | 2 | 2
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SELECT (i + $2)::INTEGER LIMIT $3 | 2 | 2
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SELECT PLUS_ONE($1) | 2 | 2
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SELECT PLUS_TWO($1) | 2 | 2
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SELECT pg_stat_statements_reset() | 1 | 1
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(5 rows)
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--
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-- utility commands
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--
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SET pg_stat_statements.track_utility = TRUE;
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SELECT pg_stat_statements_reset();
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pg_stat_statements_reset
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--------------------------
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(1 row)
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SELECT 1;
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?column?
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----------
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1
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(1 row)
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CREATE INDEX test_b ON test(b);
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DROP TABLE test \;
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DROP TABLE IF EXISTS test \;
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DROP FUNCTION PLUS_ONE(INTEGER);
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NOTICE: table "test" does not exist, skipping
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DROP TABLE IF EXISTS test \;
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DROP TABLE IF EXISTS test \;
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DROP FUNCTION IF EXISTS PLUS_ONE(INTEGER);
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NOTICE: table "test" does not exist, skipping
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NOTICE: table "test" does not exist, skipping
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NOTICE: function plus_one(pg_catalog.int4) does not exist, skipping
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DROP FUNCTION PLUS_TWO(INTEGER);
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SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
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query | calls | rows
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-------------------------------------------+-------+------
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CREATE INDEX test_b ON test(b) | 1 | 0
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DROP FUNCTION IF EXISTS PLUS_ONE(INTEGER) | 1 | 0
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DROP FUNCTION PLUS_ONE(INTEGER) | 1 | 0
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DROP FUNCTION PLUS_TWO(INTEGER) | 1 | 0
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DROP TABLE IF EXISTS test | 3 | 0
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DROP TABLE test | 1 | 0
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SELECT $1 | 1 | 1
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SELECT pg_stat_statements_reset() | 1 | 1
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(8 rows)
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DROP EXTENSION pg_stat_statements;
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