troubleshooting Question

MySQL FK Constraint Error (1451) - But I have no FKs!

Avatar of apj68
apj68 asked on
MySQL Server
7 Comments2 Solutions1895 ViewsLast Modified:
This is driving me crazy.  My table has no foreign keys and no indices but when I try to delete rows, I get:

Error Code: 1451. Cannot delete or update a parent row: a foreign key constraint fails (temp file operation failed)

This table used to have constraints, but I removed them.  I did refresh MySql workbench and also reconnected with the client.  If I describe the table, it does not show constraints other than the PK.

select * from information_schema.table_constraints
where table_schema = schema()
and table_name = 'AppVersion';

[returns]
NULL, 'cmdb', 'PRIMARY', 'cmdb', 'AppVersion', 'PRIMARY KEY'

show create table AppVersion;

[returns]
'AppVersion', 'CREATE TABLE `AppVersion` (
  `appVersionID` int(11) NOT NULL AUTO_INCREMENT,
  `Environment_environmentID` int(11) NOT NULL,
  `rollback_version` varchar(45) NOT NULL,
  `app_version` varchar(45) NOT NULL,
  PRIMARY KEY (`appVersionID`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=latin1'

The table that originally had the FK (Environment) in the AppVersion has nothing either:

show create table Environment

[returns]
'Environment', 'CREATE TABLE `Environment` (
  `environmentID` int(11) NOT NULL AUTO_INCREMENT,
  `env_name` varchar(45) DEFAULT NULL,
  PRIMARY KEY (`environmentID`)
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=latin1'

Is there something I need to do to shake out that old constraint??  Thanks for your suggestions!

Andy
ASKER CERTIFIED SOLUTION
Pieter Marais
Senior Developer

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