How to get past the following "Cannot change column 'xxx': used in a foreign key constraint"

This question is in reference to Atlassian Documentation: MySQL Collation Repair: Table Level Changes

Example:

ALTER TABLE `CONTENT` MODIFY `CREATOR` varchar(255) CHARACTER SET UTF8 COLLATE utf8_bin;

ERROR 1832 (HY000): Cannot change column 'CREATOR': used in a foreign key constraint 'FK_CONTENT_CREATOR'

 

 

2 answers

1 accepted

4 votes
Answer accepted

You can disable the constraints checks, run the ALTER statement and then enable the constraint checker again:

SET foreign_key_checks = 0;
ALTER TABLE `CONTENT` MODIFY `CREATOR` varchar(255) CHARACTER SET UTF8 COLLATE utf8_bin;
SET foreign_key_checks = 1;

See if it helps...

Thank you Guilherme.  Got my service up an running again.

You're welcome, buddy smile

thank you guy.

The above solution is not recommended on production though. You can try locking table before executing your commands and finally unlocking it.

Thank you for your reply and helped me solve the problem.

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