1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
connect con1,localhost,root,,;
SET SESSION innodb_lock_wait_timeout=1;
connection default;
SET SESSION innodb_lock_wait_timeout=1;
# Case 1: Test primary index - CREATE TABLE .. SELECT .. SKIP LOCKED
CREATE TABLE t1(
seat_id INT,
state INT,
PRIMARY KEY(seat_id)
) ENGINE=InnoDB;
INSERT INTO t1 VALUES(1,0), (2,0), (3,0), (4,0);
BEGIN;
SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
seat_id state
1 0
2 0
connection con1;
BEGIN;
CREATE TEMPORARY TABLE s0 AS SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
SELECT * FROM s0;
seat_id state
1 0
2 0
CREATE TEMPORARY TABLE s1 AS SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE SKIP LOCKED;
SELECT * FROM s1;
seat_id state
3 0
4 0
connection default;
CREATE TEMPORARY TABLE s0 AS SELECT * FROM t1 WHERE state = 0 LOCK IN SHARE MODE SKIP LOCKED;
SELECT * FROM s0;
seat_id state
1 0
2 0
COMMIT;
DROP TABLE s0;
connection con1;
COMMIT;
DROP TABLE s0, s1;
connection default;
# Case 2: Test primary index - INSERT .. SELECT .. SKIP LOCKED
CREATE TABLE t2 LIKE t1;
BEGIN;
SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE;
seat_id state
1 0
2 0
connection con1;
BEGIN;
INSERT INTO t2 SELECT * FROM t1 WHERE state = 0 LIMIT 2 LOCK IN SHARE MODE RETURNING seat_id, state;
seat_id state
1 0
2 0
CREATE TEMPORARY TABLE t2s LIKE t1;
INSERT INTO t2s SELECT * FROM t1 WHERE state = 0 LIMIT 2 FOR UPDATE SKIP LOCKED RETURNING seat_id, state;
seat_id state
3 0
4 0
connection default;
CREATE TEMPORARY TABLE t2s LIKE t1;
INSERT INTO t2s SELECT * FROM t1 WHERE state = 0 LOCK IN SHARE MODE SKIP LOCKED RETURNING seat_id, state;
seat_id state
1 0
2 0
COMMIT;
DROP TABLE t2s;
connection con1;
COMMIT;
DROP TABLE t2s;
DROP TABLE t2;
connection default;
DROP TABLE t1;
|
