Foreign Keys with MySQL 3.23.49 and 3.23.50
sql,query Hello, i've tried the foreign key-example out of the documentation(3.5.6 Using Foreign Keys) on W2K (3.23.49 + 3.23.50) and LINUX (3.23.49). The tables persons and shirts are created as innodb-tables. I could insert a shirt for a non-existing person. Also i could delete a person with existing shirts. I have experimented with 'ON DELETE' and 'ON UPDATE' with no effects. What's wrong? Is there a switch to activate foreign keys? Heiner Jostkleigrewe - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: Foreign Keys with MySQL 3.23.49 and 3.23.50
Hi Nothing is wrong! The behaviour of your example is correct, because MySQL does not support the concept of foreign keys. See section 1.4.4.5 of the MySQL manual. In other words data integrity between two tables is not ensured by MySQL. Your application code must solve this. Regards Rene Moonen Jostkleigrewe, Heiner wrote: sql,query Hello, i've tried the foreign key-example out of the documentation(3.5.6 Using Foreign Keys) on W2K (3.23.49 + 3.23.50) and LINUX (3.23.49). The tables persons and shirts are created as innodb-tables. I could insert a shirt for a non-existing person. Also i could delete a person with existing shirts. I have experimented with 'ON DELETE' and 'ON UPDATE' with no effects. What's wrong? Is there a switch to activate foreign keys? Heiner Jostkleigrewe - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: Foreign Keys with MySQL 3.23.49 and 3.23.50
This example is in InnoDB though, which should support foreign key constraints. Chris Book In other words data integrity between two tables is not ensured by MySQL. Your application code must solve this. - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
AW: Foreign Keys with MySQL 3.23.49 and 3.23.50
Hello, excuse me. I've looked at the wrong place. I found the solution at www.innodb.com: CREATE TABLE parent(id INT NOT NULL, PRIMARY KEY (id)) TYPE=INNODB; CREATE TABLE child(id INT, parent_id INT, INDEX par_ind (parent_id), FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE ) TYPE=INNODB; This examples works great. Heiner Jostkleigrewe -Ursprüngliche Nachricht- Von: Harald Fuchs [SMTP:[EMAIL PROTECTED]] Gesendet am: Dienstag, 28. Mai 2002 12:46 An: [EMAIL PROTECTED] Betreff: Re: Foreign Keys with MySQL 3.23.49 and 3.23.50 In article [EMAIL PROTECTED], Jostkleigrewe, Heiner [EMAIL PROTECTED] writes: sql,query Hello, i've tried the foreign key-example out of the documentation(3.5.6 Using Foreign Keys) on W2K (3.23.49 + 3.23.50) and LINUX (3.23.49). The tables persons and shirts are created as innodb-tables. I could insert a shirt for a non-existing person. Also i could delete a person with existing shirts. I have experimented with 'ON DELETE' and 'ON UPDATE' with no effects. What's wrong? Is there a switch to activate foreign keys? No. Could you post some SQL code which lets us reproduce the problem? - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
