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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
# Setup
create table parent (
pk int primary key,
id1 int unique,
id2 int unique,
id3 int unique,
ref1 int,
ref2 int,
ref3 int
) engine ndb;
create table child (
pk int primary key,
ref1 int,
ref2 int
) engine ndb;
# Add self referential foreign keys
# Add one with a user specified constraint name
alter table parent
add constraint fk_p1 foreign key ref1_idx(ref1) references parent (id1),
algorithm = copy;
# Verify the foreign keys on parent
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`id3` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
`ref3` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
UNIQUE KEY `id3` (`id3`),
KEY `fk_p1` (`ref1`),
CONSTRAINT `fk_p1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Add one with generated constraint name
alter table parent
add foreign key ref2_idx(ref2) references parent (id2),
algorithm = copy;
# Verify the foreign keys on parent
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`id3` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
`ref3` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
UNIQUE KEY `id3` (`id3`),
KEY `fk_p1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `fk_p1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`),
CONSTRAINT `parent_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Add foreign keys on child referencing parent
# Add one with a user specified constraint name
alter table child
add constraint fk_c1 foreign key ref1_idx(ref1) references parent (id1),
algorithm = copy;
# Verify the foreign keys on child
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Add one with generated constraint name
alter table child
add foreign key ref2_idx(ref2) references parent (id2),
algorithm = copy;
# Verify the foreign keys on child
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Add a foreign key to the parent and verify that the
# exisiting foreign key constraints are consistent
alter table parent
add foreign key ref3_idx(ref3) references parent (id3),
algorithm = copy;
# Verify the foreign keys on parent and child
SHOW CREATE TABLE test.parent;
Table Create Table
parent CREATE TABLE `parent` (
`pk` int NOT NULL,
`id1` int DEFAULT NULL,
`id2` int DEFAULT NULL,
`id3` int DEFAULT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
`ref3` int DEFAULT NULL,
PRIMARY KEY (`pk`),
UNIQUE KEY `id1` (`id1`),
UNIQUE KEY `id2` (`id2`),
UNIQUE KEY `id3` (`id3`),
KEY `fk_p1` (`ref1`),
KEY `ref2_idx` (`ref2`),
KEY `ref3_idx` (`ref3`),
CONSTRAINT `fk_p1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`),
CONSTRAINT `parent_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `parent_fk_2` FOREIGN KEY (`ref3`) REFERENCES `parent` (`id3`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
SHOW CREATE TABLE test.child;
Table Create Table
child CREATE TABLE `child` (
`pk` int NOT NULL,
`ref1` int DEFAULT NULL,
`ref2` int DEFAULT NULL,
PRIMARY KEY (`pk`),
KEY `fk_c1` (`ref1`),
KEY `ref2_idx` (`ref2`),
CONSTRAINT `child_fk_1` FOREIGN KEY (`ref2`) REFERENCES `parent` (`id2`),
CONSTRAINT `fk_c1` FOREIGN KEY (`ref1`) REFERENCES `parent` (`id1`)
) ENGINE=ndbcluster DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
Foreign keys consistent across NDB and all connected mysqld's DDs
# Cleanup
drop table child, parent;
|
