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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=rocksdb;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(10000,'foobar');
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
UPDATE t1 SET a=a+100;
SELECT a,b FROM t1;
a b
101 a
101 a
10100 foobar
10100 foobar
102 b
102 b
103 c
103 c
104 d
104 d
105 e
105 e
UPDATE t1 SET a=a-100, b=DEFAULT WHERE a>100;
SELECT a,b FROM t1;
a b
1 NULL
1 NULL
10000 NULL
10000 NULL
2 NULL
2 NULL
3 NULL
3 NULL
4 NULL
4 NULL
5 NULL
5 NULL
UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY b DESC, a ASC LIMIT 1;
SELECT a,b FROM t1;
a b
1 NULL
1 update
10000 NULL
10000 NULL
2 NULL
2 NULL
3 NULL
3 NULL
4 NULL
4 NULL
5 NULL
5 NULL
DROP TABLE t1;
CREATE TABLE t1 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=rocksdb;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(10000,'foobar');
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
BEGIN;
UPDATE t1 SET a=a+100;
UPDATE t1 SET a=a-50, b=DEFAULT WHERE a>100;
COMMIT;
SELECT * FROM t1 ORDER BY pk;
a b pk
10050 NULL 12
10050 NULL 6
51 NULL 1
51 NULL 7
52 NULL 2
52 NULL 8
53 NULL 3
53 NULL 9
54 NULL 10
54 NULL 4
55 NULL 11
55 NULL 5
BEGIN;
UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY a DESC, b ASC LIMIT 3;
UPDATE t1 SET b = '';
ROLLBACK;
SELECT * FROM t1 ORDER BY pk;
a b pk
51 NULL 1
52 NULL 2
53 NULL 3
54 NULL 4
55 NULL 5
10050 NULL 6
51 NULL 7
52 NULL 8
53 NULL 9
54 NULL 10
55 NULL 11
10050 NULL 12
BEGIN;
UPDATE t1 SET b = 'update2' WHERE a <= 100;
SAVEPOINT spt1;
UPDATE t1 SET b = '';
ROLLBACK TO SAVEPOINT spt1;
ERROR HY000: MyRocks currently does not support ROLLBACK TO SAVEPOINT if modifying rows.
UPDATE t1 SET b = 'upd' WHERE a = 10050;
COMMIT;
ERROR HY000: This transaction was rolled back and cannot be committed. Only supported operation is to roll it back, so all pending changes will be discarded. Please restart another transaction.
SELECT * FROM t1 ORDER BY pk;
a b pk
51 NULL 1
52 NULL 2
53 NULL 3
54 NULL 4
55 NULL 5
10050 NULL 6
51 NULL 7
52 NULL 8
53 NULL 9
54 NULL 10
55 NULL 11
10050 NULL 12
DROP TABLE t1;
CREATE TABLE t1 (a INT, b CHAR(8), UNIQUE INDEX(a)) ENGINE=RocksDB;
INSERT INTO t1 (a,b) VALUES (1,'foo'),(2,'bar');
UPDATE t1 SET a=a+100;
SELECT * FROM t1;
a b
101 foo
102 bar
DROP TABLE t1;
|