101 lines
4.0 KiB
Plaintext
101 lines
4.0 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,
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c int,
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unique(b) using hash,
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index(c)) engine = ndb;
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Warnings:
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Warning 1121 Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
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alter table child add constraint fkname foreign key (b) references parent (a) on update restrict on delete set null;
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`a`) ON DELETE SET NULL ON UPDATE RESTRICT)
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`a`) ON DELETE SET NULL ON UPDATE RESTRICT)
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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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1 NULL 1
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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 update restrict on delete set null;
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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),(3,3,1);
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`a`) ON DELETE SET NULL ON UPDATE RESTRICT)
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insert into child values (4,4,4);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`a`) ON DELETE SET NULL ON UPDATE RESTRICT)
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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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1 1 NULL
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2 2 2
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3 3 NULL
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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 update set null on delete set null;
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE SET NULL)
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`b`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE SET NULL)
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begin;
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update parent set b = 3 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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1 NULL 1
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2 2 2
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rollback;
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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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1 NULL 1
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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 update set null on delete set null;
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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),(3,3,1);
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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 (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE SET NULL)
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insert into child values (4,4,4);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `fkname` FOREIGN KEY (`c`) REFERENCES `parent` (`b`) ON DELETE SET NULL ON UPDATE SET NULL)
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begin;
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update parent set b = 3 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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1 1 NULL
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2 2 2
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3 3 NULL
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rollback;
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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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1 1 NULL
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2 2 2
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3 3 NULL
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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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drop table parent, child;
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