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# Init for ndb_show_tables result
CREATE TEMPORARY TABLE IF NOT EXISTS ndb_show_tables_results (
id INT,
type VARCHAR(20),
state VARCHAR(20),
logging VARCHAR(20),
_database VARCHAR(255),
_schema VARCHAR(20),
name VARCHAR(255)
);
#
# Create child tables before parents
# by turning off foreign_key_checks for this session
#
select @@foreign_key_checks;
@@foreign_key_checks
1
set @@foreign_key_checks=0;
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references t2(pk1)
) engine=ndb;
create table t3 (
pk int not null primary key,
b int, c int,
d int, e int, f int,
g int, h int, i int, j int,
foreign key (b, c) references t4(pk1, pk2),
foreign key (d, e, f) references t5(uk1, uk2, uk3),
foreign key (g, h, i, j) references t6(oi1, oi2, oi3, oi4)
) engine=ndb;

ndb_show_tables completed.....

# There should be 4 mock tables created
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
4
# There should be 1 mock table created for t1
select type, name from ndb_show_tables_results
where name like "'NDB$FKM_<id>%'";
type	name
'UserTable'	'NDB$FKM_<id>_0_t2'
# There should be 3 mock tables created for t3
select type, name from ndb_show_tables_results
where name like "'NDB$FKM_<id>%'" order by name;
type	name
'UserTable'	'NDB$FKM_<id>_0_t4'
'UserTable'	'NDB$FKM_<id>_1_t5'
'UserTable'	'NDB$FKM_<id>_2_t6'
drop table t3;

ndb_show_tables completed.....

# There should be 1 mock table
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
# Only t1 should have 1 mock table
select type, name from ndb_show_tables_results
where name like "'NDB$FKM_<id>%'";
type	name
'UserTable'	'NDB$FKM_<id>_0_t2'
drop table t1;
# There should be 0 mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
#
# Create child table before parent
# by turning off foreign_key_checks for this session
#
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references t2(pk1)
) engine=ndb;
create table t2 (
pk1 int not null primary key,
c int
) engine=ndb;

ndb_show_tables completed.....

# There should be 0 mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
# Verify that fk is working now when parent has been resolved
set foreign_key_checks=1;
insert into t1 values(1, 2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
set foreign_key_checks=0;
drop table t1, t2;
#
# Exceed table name when creating the mock table by referencing
# a not yet created table with really long name
#
# 1) By blowing the mock_tabname buffer(currently 512 bytes)
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_abcdefghijklmnopqrstuvxyz_(pk1)
) engine=ndb;
ERROR HY000: Cannot add foreign key constraint
show warnings;
Level	Code	Message
Warning	1215	Failed to create mock parent table, too long mock name
Error	1215	Cannot add foreign key constraint
#
# show create of table with mock table references
#
create table t1 (
a int not null,
b int not null,
c int not null,
primary key (a),
unique key (b) using hash,
key (c),
constraint fk1 foreign key(a) references t2 (a),
constraint fk2 foreign key(b) references t3 (a),
constraint fk3 foreign key(c) references t4 (a),
constraint fk4 foreign key(a) references t2 (b),
constraint fk5 foreign key(b) references t3 (b),
constraint fk6 foreign key(c) references t4 (b)
) engine=ndbcluster;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  `c` int(11) NOT NULL,
  PRIMARY KEY (`a`),
  UNIQUE KEY `b` (`b`) USING HASH,
  KEY `c` (`c`),
  CONSTRAINT `fk1` FOREIGN KEY (`a`) REFERENCES `t2` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk2` FOREIGN KEY (`b`) REFERENCES `t3` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk3` FOREIGN KEY (`c`) REFERENCES `t4` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk4` FOREIGN KEY (`a`) REFERENCES `t2` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk5` FOREIGN KEY (`b`) REFERENCES `t3` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk6` FOREIGN KEY (`c`) REFERENCES `t4` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
create table t2 (
a int primary key,
b int not null,
c int not null,
unique(b) using hash,
index(c)
) engine = ndb;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  `c` int(11) NOT NULL,
  PRIMARY KEY (`a`),
  UNIQUE KEY `b` (`b`) USING HASH,
  KEY `c` (`c`),
  CONSTRAINT `fk2` FOREIGN KEY (`b`) REFERENCES `t3` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk3` FOREIGN KEY (`c`) REFERENCES `t4` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk5` FOREIGN KEY (`b`) REFERENCES `t3` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk6` FOREIGN KEY (`c`) REFERENCES `t4` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk1` FOREIGN KEY (`a`) REFERENCES `t2` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk4` FOREIGN KEY (`a`) REFERENCES `t2` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
set @@ndb_show_foreign_key_mock_tables= 1;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  `c` int(11) NOT NULL,
  PRIMARY KEY (`a`),
  UNIQUE KEY `b` (`b`) USING HASH,
  KEY `c` (`c`),
  CONSTRAINT `fk2` FOREIGN KEY (`b`) REFERENCES `NDB$FKM_<child_id>_<id>_t3` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk3` FOREIGN KEY (`c`) REFERENCES `NDB$FKM_<child_id>_<id>_t4` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk5` FOREIGN KEY (`b`) REFERENCES `NDB$FKM_<child_id>_<id>_t3` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk6` FOREIGN KEY (`c`) REFERENCES `NDB$FKM_<child_id>_<id>_t4` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk1` FOREIGN KEY (`a`) REFERENCES `t2` (`a`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk4` FOREIGN KEY (`a`) REFERENCES `t2` (`b`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
set @@ndb_show_foreign_key_mock_tables= 0;
drop table t1, t2;
#
# Create child table and then the parent
# which does not match the fk
#
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references t2(pk1)
) engine=ndb;
create table t2 (
pk2 int not null primary key,
c int
) engine=ndb;
Warnings:
Warning	1215	Could not resolve 't2' as fk parent for 'test/def/t1' since it didn't have all the referenced columns

ndb_show_tables completed.....

# There should be 1 mock table still
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
drop table t1, t2;
#
# Create child table and then the parent
# which does not match any index
#
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references t2(c)
) engine=ndb;
create table t2 (
pk1 int not null primary key,
c int
) engine=ndb;
Warnings:
Warning	1215	Could not resolve 't2' as fk parent for 'test/def/t1' since no matching index could be found

ndb_show_tables completed.....

# There should be 1 mock table still
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
drop table t1, t2;
set @@ndb_show_foreign_key_mock_tables= 1;
#
# Test where FK goes from t1->t2->t3->t4 and tables are created in that order
create table t1 (
pk11 int not null primary key,
b int,
foreign key (b) references t2(pk21)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
create table t2 (
pk21 int not null primary key,
b int, c int,
foreign key (b, c) references t3(pk31, pk32)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t3' referenced by 't2'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
create table t3 (
pk31 int not null,
pk32 int not null,
primary key(pk31, pk32),
d int, e int,f int,
foreign key (d,e,f) references t4(pk41, pk42, pk43)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t4' referenced by 't3'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t3' - resolved by 't3'
create table t4 (
pk41 int not null,
pk42 int not null,
pk43 int not null,
primary key(pk41, pk42, pk43),
m varchar(55)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t4' - resolved by 't4'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
drop table t1, t2, t3, t4;
#
# Test where FK 'fans out' t1->t2 t1->t3 t1->t4, create t1 first
create table t1 (
pk11 int not null primary key,
b int,
foreign key (b) references t2(c),
d int, e int,
foreign key (d, e) references t3(f, g),
h varchar(55), i int, j datetime,
foreign key (h, i, j) references t4(k, l, m)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t3' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t4' referenced by 't1'
create table t2 (
pk21 int not null primary key,
c int,
unique(c)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
create table t3 (
pk31 int not null,
pk32 int not null,
primary key(pk31, pk32),
g int, f int,
unique(f, g)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t3' - resolved by 't3'
create table t4 (
pk41 int not null,
pk42 int not null,
pk43 int not null,
primary key(pk41, pk42, pk43),
m varchar(55), l int, k datetime,
unique(k, l, m)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t4' - resolved by 't4'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
drop table t1, t2, t3, t4;
#
# Test where FK refers to 2+ different indices in parent t1->t2(1) t1->t2(2)
create table t1 (
pk11 int not null primary key,
foreign key (pk11) references t2(pk21),
b int,
foreign key (b) references t2(c),
d int, e int,
foreign key (d, e) references t2(f, g),
h varchar(55), i int, j datetime,
foreign key (h, i, j) references t2(k, l, m)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
create table t2 (
pk21 int not null primary key,
c int,
unique(c),
g int, f int,
unique(f, g),
m varchar(55), l int, k datetime,
unique(k, l, m)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
drop table t1, t2;
#
# Test drop of referenced table(mock table should be created)
#
create table t1 (
pk1 int not null primary key,
foreign key (pk1) references t2(pk2),
a varchar(255)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
create table t2 (
pk2 int not null primary key,
b datetime
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
drop table t2;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'

ndb_show_tables completed.....

# There should be 1 mock table created for t1
select type, name from ndb_show_tables_results
where name like "'NDB$FKM_<id>%'";
type	name
'UserTable'	'NDB$FKM_<id>_0_t2'
drop table t1;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - referencing table dropped

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
set @@ndb_show_foreign_key_mock_tables= 0;
#
# Test mock tables in different databases, mock table
# should be created in same database as the real parent would.
#
set @@ndb_show_foreign_key_mock_tables= 1;
create database mydb0;
create database mydb1;
create table mydb1.t1 (
a int primary key,
constraint fk1 foreign key(a) references mydb0.t2(a)
) engine = ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'

ndb_show_tables completed.....

# There should be 1 mock table created for t1
select type, _database, name from ndb_show_tables_results
where name like "'NDB$FKM_<id>%'";
type	_database	name
'UserTable'	'mydb0'	'NDB$FKM_<id>_0_t2'
drop table mydb1.t1;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - referencing table dropped

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
create table mydb1.t1 (
a int primary key,
constraint fk1 foreign key(a) references mydb0.t2(a)
) engine = ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
create table mydb0.t2 (
a int primary key
) engine = ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
# Drop child then parent
drop table mydb1.t1;
drop table mydb0.t2;
create table mydb1.t1 (
a int primary key,
constraint fk1 foreign key(a) references mydb0.t2(a)
) engine = ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
create table mydb0.t2 (
a int primary key
) engine = ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
# Drop parent then child(creates mock which is then dropped)
drop table mydb0.t2;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
drop table mydb1.t1;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - referencing table dropped

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
#
# Create spagetthi foreign keys between tables in three different databases
#
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references mydb1.t2(pk1),
c int,
unique(c),
j int,
foreign key (j) references mydb0.t3(pk2),
k int,
foreign key (k) references mydb0.t1(pk5),
l int,
foreign key (l) references mydb1.t1(pk6),
y int,
foreign key (y) references mydb1.t1(z)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t1' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t1' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t1' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t2' referenced by 't1'
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t3' referenced by 't1'
create table mydb1.t2 (
pk1 int not null primary key,
d int,
foreign key (d) references mydb0.t3(pk2)
) engine=ndb;
Warnings:
Warning	1003	Created mock table 'NDB$FKM_<child_id>_<id>_t3' referenced by 't2'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
create table mydb0.t3 (
pk2 int not null primary key,
e int,
foreign key (e) references test.t1(c)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t3' - resolved by 't3'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t3' - resolved by 't3'
create table mydb0.t4 (
pk3 int not null primary key,
f int,
foreign key (f) references t3(pk2)
) engine=ndb;
create table mydb0.t5 (
pk4 int not null primary key,
g int,
foreign key (g) references test.t1(pk),
h int,
foreign key (h) references mydb1.t2(pk1),
i int,
foreign key (i) references mydb0.t3(pk2)
) engine=ndb;
create table mydb0.t1 (
pk5 int not null primary key,
m int,
foreign key (m) references test.t1(pk),
n int,
foreign key (n) references mydb1.t2(pk1),
o int,
foreign key (o) references mydb0.t3(pk2)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t1' - resolved by 't1'
create table mydb1.t1 (
pk6 int not null primary key,
p int,
foreign key (p) references test.t1(pk),
q int,
foreign key (q) references mydb1.t2(pk1),
x int,
foreign key (x) references mydb0.t3(pk2),
z int,
unique(z)
) engine=ndb;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t1' - resolved by 't1'
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t1' - resolved by 't1'
set @@ndb_show_foreign_key_mock_tables= 0;

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
# Drop the database mydb0 with all tables still there
drop database mydb0;

ndb_show_tables completed.....

# There should be 4 mock tables created by dropping mydb0
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
4
# Drop also database mydb1
drop database mydb1;

ndb_show_tables completed.....

# There should be 5 mock tables all referenced by test.t1
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
5
# Drop t1 and the 5 remaining mocks
drop table t1;

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
#
# ALTER a table which references mock parent
#
create table t1 (
pk int not null primary key,
b int,
foreign key (b) references t2(pk1)
) engine=ndb;

ndb_show_tables completed.....

# There should be one mock table in place of t2
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_t2'
alter table t1 add column c int;
Warnings:
Warning	1478	Converted FIXED field 'c' to DYNAMIC to enable on-line ADD COLUMN

ndb_show_tables completed.....

# There should be one mock table still
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_t2'
alter table t1 algorithm = copy, add column d int not null;

ndb_show_tables completed.....

# There should be one mock table still
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_t2'
drop table t1;

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
#
# Alter table to add foreign keys referencing non existing parents. One
# new mock should be created per fk
#
create table child (
a int primary key auto_increment,
b int not null,
c int not null,
unique(b) using hash,
index(c)
) engine = ndb;
alter table child algorithm=inplace, add constraint fk1 foreign key (a) references parent(a);
alter table child algorithm=inplace, add constraint fk2 foreign key (b) references parent(col1);
alter table child algorithm=inplace, add constraint fk3 foreign key (c) references parent(col2);
alter table child algorithm=inplace,
add constraint fk4 foreign key (c) references parent(col3),
add constraint fk5 foreign key (c) references parent(col4),
add constraint fk6 foreign key (c) references parent(col5);

ndb_show_tables completed.....

# There should be 6 mock tables
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
alter table child algorithm=inplace, drop foreign key fk1;

ndb_show_tables completed.....

# There should be 5 mock tables
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
alter table child algorithm=inplace,
drop foreign key fk3,
drop foreign key fk4,
drop foreign key fk6;

ndb_show_tables completed.....

# There should be 2 mock tables left
select name from ndb_show_tables_results where name like "'NDB\$FKM%'";
name
'NDB$FKM_<child_id>_<id>_parent'
'NDB$FKM_<child_id>_<id>_parent'
drop table child;

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
#
# Alter table into place(i.e rename) as new parent, should remove
# the mock table
#
create table t1 (
pk1 int not null primary key,
b int,
foreign key (b) references t2(pk2)
) engine=ndb;
create table t3 (
pk2 int not null primary key,
b int
) engine=ndb;

ndb_show_tables completed.....

# There should be one mock table for t1
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
set @@ndb_show_foreign_key_mock_tables= 1;
alter table t3 rename t2;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t2' - resolved by 't2'
set @@ndb_show_foreign_key_mock_tables= 0;
alter table t2 rename t3;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `pk1` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`pk1`),
  KEY `b` (`b`),
  CONSTRAINT `FK_<child_id>_<id>` FOREIGN KEY (`b`) REFERENCES `t3` (`pk2`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
drop table t3;
create table t2 (
pk2 int not null primary key,
b int
) engine=ndb;

ndb_show_tables completed.....

# There should be one mock table for t1
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
1
set @@ndb_show_foreign_key_mock_tables= 1;
alter table t2 algorithm=inplace, rename t3;
Warnings:
Warning	1003	Dropped mock table 'NDB$FKM_<child_id>_<id>_t3' - resolved by 't3'
set @@ndb_show_foreign_key_mock_tables= 0;

ndb_show_tables completed.....

# There should be no mock tables
select count(*) from ndb_show_tables_results where name like "'NDB\$FKM%'";
count(*)
0
drop table t3, t1;
#
# Truncating table which references mock table
#
create table t1 (
pk1 int not null primary key,
b int,
foreign key fk1 (b) references t2(pk2)
) engine=ndb;
set foreign_key_checks=1;
truncate table t1;
set foreign_key_checks=0;
set @@ndb_show_foreign_key_mock_tables= 1;
truncate table t1;
set @@ndb_show_foreign_key_mock_tables= 0;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `pk1` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`pk1`),
  KEY `fk1` (`b`),
  CONSTRAINT `fk1` FOREIGN KEY (`b`) REFERENCES `t2` (`pk2`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
drop table t1;
#
# Truncating referenced table -> not allowed
#
create table t2 (
pk2 int not null primary key,
c int
) engine=ndb;
create table t1 (
pk1 int not null primary key,
b int,
foreign key (b) references t2(pk2)
) engine=ndb;
set foreign_key_checks=1;
truncate table t2;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint ()
set foreign_key_checks=0;
truncate table t2;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint ()
drop table t1, t2;
#
# Truncating referenced table which references
# another table -> not allowed
#
create table t3 (
pk3 int not null primary key,
d int
) engine=ndb;
create table t2 (
pk2 int not null primary key,
c int,
foreign key (c) references t3(pk3)
) engine=ndb;
create table t1 (
pk1 int not null primary key,
b int,
foreign key (b) references t2(pk2)
) engine=ndb;
set foreign_key_checks=1;
truncate table t2;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint ()
set foreign_key_checks=0;
truncate table t2;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint ()
drop table t1, t2, t3;
#
# Truncating referencing table
#
create table t2 (
pk2 int not null primary key,
c int
) engine=ndb;
create table t1 (
pk1 int not null primary key,
b int,
foreign key fk1 (b) references t2(pk2)
) engine=ndb;
set @@ndb_show_foreign_key_mock_tables= 1;
set foreign_key_checks=1;
truncate table t1;
set foreign_key_checks=0;
truncate table t1;
set @@ndb_show_foreign_key_mock_tables= 0;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `pk1` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  PRIMARY KEY (`pk1`),
  KEY `fk1` (`b`),
  CONSTRAINT `fk1` FOREIGN KEY (`b`) REFERENCES `t2` (`pk2`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
drop table t1, t2;
#
# Truncate with multiple foreign keys
#
create table t2 (
pk2 int not null primary key,
c int
) engine=ndb;
create table t1 (
pk1 int not null primary key,
b int,
c int,
d int,
e int,
foreign key fk1 (b) references t2(pk2),
foreign key fk2 (c) references t3(pk3),
foreign key fk3 (d) references t3(pk4),
foreign key fk4 (e) references t4(pk5)
) engine=ndb;
set @@ndb_show_foreign_key_mock_tables= 1;
set foreign_key_checks=1;
truncate table t1;
set foreign_key_checks=0;
truncate table t1;
set @@ndb_show_foreign_key_mock_tables= 0;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `pk1` int(11) NOT NULL,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  `d` int(11) DEFAULT NULL,
  `e` int(11) DEFAULT NULL,
  PRIMARY KEY (`pk1`),
  KEY `fk1` (`b`),
  KEY `fk2` (`c`),
  KEY `fk3` (`d`),
  KEY `fk4` (`e`),
  CONSTRAINT `fk1` FOREIGN KEY (`b`) REFERENCES `t2` (`pk2`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk2` FOREIGN KEY (`c`) REFERENCES `t3` (`pk3`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk3` FOREIGN KEY (`d`) REFERENCES `t3` (`pk4`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `fk4` FOREIGN KEY (`e`) REFERENCES `t4` (`pk5`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
drop table t1, t2;
#
# Create child table referencing mock parent, insert data and
# then create the real parent (like mysqldump does it)
#
CREATE TABLE `address` (
`no` int(11) NOT NULL AUTO_INCREMENT,
`type` int(11) NOT NULL DEFAULT '37',
`customer_id` int(11) NOT NULL,
`street` varchar(255) DEFAULT NULL,
`country` int(11) DEFAULT NULL,
PRIMARY KEY (`no`),
KEY `ca_fk1` (`customer_id`),
CONSTRAINT `ca_fk1` FOREIGN KEY(`customer_id`) REFERENCES `customer` (`id`)
ON DELETE CASCADE ON UPDATE RESTRICT
) ENGINE=ndbcluster AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;
INSERT INTO `address` VALUES (1,37,1,'Main st. 1215',48);
CREATE TABLE `customer` (
`id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
# Check DML
insert into address (type, customer_id, street, country)
values (38,2,'Second st. 2326',49 );
insert into address (type, customer_id, street, country)
values (39,1,'Third st. 3437',50 );
update address set country=50 where no=2;
insert into customer values(1);
# Check DML with foreign_key_checks on
set foreign_key_checks=1;
update address set customer_id = 3 where no = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
delete from customer where id = 1;
select no, type, customer_id from address;
no	type	customer_id
2	38	2
set foreign_key_checks=0;
drop table address, customer;
#
# Create child table referencing real parent, insert data
# and then create fk(like mysqldump does not do it)
#
CREATE TABLE `customer` (
`id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=ndbcluster DEFAULT CHARSET=latin1;
INSERT INTO `customer` VALUES (1);
CREATE TABLE `address` (
`no` int(11) NOT NULL AUTO_INCREMENT,
`type` int(11) NOT NULL DEFAULT '37',
`customer_id` int(11) NOT NULL,
`street` varchar(255) DEFAULT NULL,
`country` int(11) DEFAULT NULL,
PRIMARY KEY (`no`),
KEY `ca_fk1` (`customer_id`)
) ENGINE=ndbcluster AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;
INSERT INTO `address` VALUES (1,37,1,'Main st. 1215',48);
INSERT INTO `address` VALUES (2,22,2,'Second st. 2222',2);
# Add fk inplace
set foreign_key_checks=1;
ALTER TABLE address ALGORITHM=inplace,
ADD CONSTRAINT `ca_fk1` FOREIGN KEY(`customer_id`) REFERENCES `customer` (`id`)
ON DELETE CASCADE ON UPDATE RESTRICT;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
set foreign_key_checks=0;
ALTER TABLE address ALGORITHM=inplace,
ADD CONSTRAINT `ca_fk1` FOREIGN KEY(`customer_id`) REFERENCES `customer` (`id`)
ON DELETE CASCADE ON UPDATE RESTRICT;
# Add another fk copying
set foreign_key_checks=1;
ALTER TABLE address ALGORITHM=copy,
ADD CONSTRAINT `ca_fk2` FOREIGN KEY(`customer_id`) REFERENCES `customer` (`id`)
ON DELETE CASCADE ON UPDATE RESTRICT;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
set foreign_key_checks=0;
ALTER TABLE address ALGORITHM=copy,
ADD CONSTRAINT `ca_fk2` FOREIGN KEY(`customer_id`) REFERENCES `customer` (`id`)
ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE address ALGORITHM=inplace,
ADD COLUMN a int COLUMN_FORMAT DYNAMIC;
ALTER TABLE address ALGORITHM=copy,
ADD COLUMN b int not null;
# Check DML with foreign_key_checks on
set foreign_key_checks=1;
update address set customer_id = 3 where no = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
update address set customer_id = 1 where no = 2;
delete from customer where id = 1;
select count(*) from address;
count(*)
0
set foreign_key_checks=0;
drop table address, customer;