create table parent (
a int primary key auto_increment,
b int not null,
c int not null,
unique(b) using hash,
index(c)) engine = ndb;
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 add constraint fkname foreign key (a) references parent(a);
insert into parent values (1,1,1);
insert into child values (1,1,1);
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table child add constraint fkname foreign key (b) references parent(a);
insert into parent values (1,1,1);
insert into child values (1,1,1);
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
update child set b = 2 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table child add constraint fkname foreign key (a) references parent(b);
insert into parent values (1,1,1);
insert into child values (1,1,1);
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
update parent set b = 2 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table child add constraint fkname foreign key (b) references parent(b);
insert into parent values (1,1,1);
insert into child values (1,1,1);
update child set b = 2 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
update parent set b = 2 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table child add constraint fkname foreign key (c) references parent(a);
insert into parent values (1,1,1);
insert into child values (1,1,1);
update child set c = 2 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
alter table child add constraint fkname foreign key (c) references parent(b);
insert into parent values (1,1,1);
insert into child values (1,1,1);
update child set c = 2 where a = 1;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
insert into child values (2,2,2);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
update parent set b = 2 where a = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
begin;
delete from parent;
delete from child;
commit;
begin;
insert into child values (2,2,2);
insert into parent values (2,2,2);
commit;
delete from child;
delete from parent;
insert into parent values (1,1,1);
begin;
insert into child values (1,1,1);
begin;
delete from parent;
commit;
commit;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
delete from child;
delete from parent;
alter table child drop foreign key fkname;
drop table parent, child;