[DDC-2679] SchemaTool ON DELETE CASCADE does not work with MSSQL Created: 13/Sep/13  Updated: 15/Jan/14

Status: Open
Project: Doctrine 2 - ORM
Component/s: None
Affects Version/s: None
Fix Version/s: 2.4
Security Level: All

Type: Bug Priority: Major
Reporter: Flip Assignee: Benjamin Eberlei
Resolution: Unresolved Votes: 0
Labels: None
Environment:

MSSQL 2008 R2



 Description   

The following queries are produced by:
vendor\doctrine\orm\tests\Doctrine\Tests\ORM\Functional\SchemaTool\DDC214Test.php

ALTER TABLE company_persons ADD CONSTRAINT FK_820EDD048EEC5B5C FOREIGN KEY (spouse_id) REFERENCES company_persons (id) ON DELETE CASCADE
ALTER TABLE company_persons_friends ADD CONSTRAINT FK_EAD47FE9217BBB47 FOREIGN KEY (person_id) REFERENCES company_persons (id) ON DELETE CASCADE
ALTER TABLE company_persons_friends ADD CONSTRAINT FK_EAD47FE96A5458E8 FOREIGN KEY (friend_id) REFERENCES company_persons (id) ON DELETE CASCADE
ALTER TABLE company_employees ADD CONSTRAINT FK_899949F0BF396750 FOREIGN KEY (id) REFERENCES company_persons (id) ON DELETE CASCADE
ALTER TABLE company_managers ADD CONSTRAINT FK_B1DEF56BBF396750 FOREIGN KEY (id) REFERENCES company_persons (id) ON DELETE CASCADE
ALTER TABLE company_auctions ADD CONSTRAINT FK_6A41FC6DBF396750 FOREIGN KEY (id) REFERENCES company_events (id) ON DELETE CASCADE
ALTER TABLE company_raffles ADD CONSTRAINT FK_9D157F46BF396750 FOREIGN KEY (id) REFERENCES company_events (id) ON DELETE CASCADE

The errors:

Msg 1785, Level 16, State 0, Line 1
Introducing FOREIGN KEY constraint 'FK_820EDD048EEC5B5C' on table 'company_persons' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 2714, Level 16, State 5, Line 1
There is already an object named 'FK_EAD47FE9217BBB47' in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 1785, Level 16, State 0, Line 1
Introducing FOREIGN KEY constraint 'FK_EAD47FE96A5458E8' on table 'company_persons_friends' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 2714, Level 16, State 5, Line 1
There is already an object named 'FK_899949F0BF396750' in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 2714, Level 16, State 5, Line 1
There is already an object named 'FK_B1DEF56BBF396750' in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 2714, Level 16, State 5, Line 1
There is already an object named 'FK_6A41FC6DBF396750' in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.
Msg 2714, Level 16, State 5, Line 1
There is already an object named 'FK_9D157F46BF396750' in the database.
Msg 1750, Level 16, State 0, Line 1
Could not create constraint. See previous errors.

An explanation why this is happening:
http://stackoverflow.com/questions/851625/foreign-key-constraint-may-cause-cycles-or-multiple-cascade-paths



 Comments   
Comment by Steve Müller [ 15/Jan/14 ]

This is a SQL Server limitation as it does not support multi-path cascades for foreign keys.
See here: http://allyourdatabase.blogspot.de/2006/11/multiple-cascade-paths-error-in-sql.html

Not sure what to do about this at the moment...

Comment by Flip [ 15/Jan/14 ]

Yes there is nothing we can do to get this to work. But what we can do is:
1. Build in some detection when this happens and then throw a php exception for this kind of error (yet to be created)
2. All tests which rely on this functionality for SQL Server should be reviewed again. There are two possibilities:
A. The test can be rewritten so that it doesn't have multiple paths.
B. if not. The test has to be skipped for SQL Server.





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