133 lines
4.8 KiB
Plaintext
133 lines
4.8 KiB
Plaintext
create table parent (
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a int primary key auto_increment,
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b int not null,
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c int not null,
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unique(b) using hash,
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index(c)) engine = ndb;
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create table child (
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a int primary key auto_increment,
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b int not null,
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c int not null,
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unique(b) using hash,
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index(c)) engine = ndb;
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alter table child add constraint fkname foreign key (a) references parent (a) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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alter table child add constraint fkname foreign key (b) references parent (a) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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update child set b = 3 where a = 1;
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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alter table child add constraint fkname foreign key (a) references parent (b) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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update parent set b = 3 where a = 1;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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alter table child add constraint fkname foreign key (b) references parent (b) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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update child set b = 3 where a = 1;
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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update parent set b = 3 where a = 1;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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alter table child add constraint fkname foreign key (c) references parent (a) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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update child set c = 3 where a = 1;
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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alter table child add constraint fkname foreign key (c) references parent (b) on delete cascade on update restrict;
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insert into parent values (1,1,1),(2,2,2);
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insert into child values (1,1,1),(2,2,2);
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update child set c = 3 where a = 1;
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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insert into child values (3,3,3);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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update parent set b = 3 where a = 1;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code)
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begin;
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delete from parent where a = 1;
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select * from child order by 1,2,3;
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a b c
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2 2 2
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commit;
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insert into parent values (1,1,1);
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insert into child values (1,1,1);
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insert into child select a+2,a+2,1+(a % 2) from child;
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insert into child select a+4,a+4,1+(a % 2) from child;
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insert into child select a+8,a+8,1+(a % 2) from child;
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insert into child select a+16,a+16,1+(a % 2) from child;
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insert into child select a+32,a+32,1+(a % 2) from child;
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insert into child select a+64,a+64,1+(a % 2) from child;
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select c, count(*) from child
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group by c
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order by 1,2;
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c count(*)
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1 64
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2 64
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delete from parent where a = 1;
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select c, count(*) from child
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group by c
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order by 1,2;
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c count(*)
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2 64
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delete from parent where a = 2;
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delete from child;
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delete from parent;
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alter table child drop foreign key fkname;
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drop table parent, child;
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