Error Creating Foreign Key On Memberid Check Data Types
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#1452 - Cannot Add Or Update A Child Row: A Foreign Key Constraint Fails
1 down vote favorite I want to create to tables in mysql, te first table is called Catégorie and the second is called Article as : (Article) 0..* ------------- 1 (Catégorie) but I get this error : Error creating foreign key on idCat (check data types) and this is the code I tried : CREATE TABLE IF NOT EXISTS `Catégorie` ( `idCat` int(11) NOT NULL, `libCat` varchar(50) DEFAULT NULL, PRIMARY KEY (`idCat`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; CREATE TABLE IF NOT EXISTS `Article` ( `codeArt` int(11) NOT NULL, `desgArt` int(11) DEFAULT NULL, `etatArt` varchar(50) DEFAULT NULL, `qteArt` int(11) DEFAULT '1', `qteseulmin` varchar(50) DEFAULT NULL, `idCat` int(11) NOT NULL, PRIMARY KEY (`codeArt`), KEY `idCat` (`idCat`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; ALTER TABLE `Article` ADD FOREIGN KEY ( `idCat` ) REFERENCES `GestionStock`.`Catégorie` ( `idCat` ) ON DELETE SET NULL ON UPDATE CASCADE ; mysql share|improve this question asked May 23 '13 at 12:02 Azer Rtyu 1042515 add a comment| 4 Answers 4 active oldest votes up vote 12 down vote accepted You declared column Article.idCat as NOT NULL, and then you are trying to create foreign key with ON DELETE SET NULL action. Change column or foreign key definition. share|improve this answer answered May 23 '13 at 12:07 Devart 76.4k12100120 thanks, mate :) –Azer Rtyu May 23 '13 at 12:12 add a comment| up vote 4 down vote One of the reasons for this error is incompatible data types. For example, in my case, the problem was that while the actual id was 'UNSIGNED', the foreign key referring to it was not declared unsigned. Hence the latter's scope was higher. Note that the opposite can work.
Search this Thread Rate Thread #1 20-Jul-2004, 03:47 jlee Awaiting Email Confirmation Join Date: Jul 2004 Posts: 9 foreign keys using phpmyadmin Hi I am creating a website and linking it to a database using php and mysql. I need to create the databses in phpmyadmin and have decided on the structure of the tables in the database. However, as expected, there are foreign keys in some of the tables - does anyone know how to link the foreign key of one table into another table within phpmyadmin so the database works properly and can be queried using sql? Is it a case of using an sql command to alter the table? http://stackoverflow.com/questions/16713421/error-creating-foreign-key-on-tablename-check-data-types I would really appreciate help with this. Thanks #2 20-Jul-2004, 06:04 JdS Senior Member Join Date: Aug 2001 Location: KUL, Malaysia Posts: 3,370 Hello jlee, MySQL has foreign key support for only InnoDB tables at the moment. I don't know if this has changed since the last release I downloaded from the site. Are the tables you plan to create going to be InnoDB tables or regular MyISAM ones? __________________J de Silva GIDApp https://www.gidforums.com/t-3208.html | GIDBlog | GIDForums | GIDNetwork | Learning Journal #3 20-Jul-2004, 08:14 jlee Awaiting Email Confirmation Join Date: Jul 2004 Posts: 9 Quote: Originally Posted by JdS Hello jlee, MySQL has foreign key support for only InnoDB tables at the moment. I don't know if this has changed since the last release I downloaded from the site. Are the tables you plan to create going to be InnoDB tables or regular MyISAM ones? Sorry - I dont know the difference between InnoDB and MyISAM tables. The tables were made in phpmyadmin and are just pretty standard tables. #4 20-Jul-2004, 16:52 JdS Senior Member Join Date: Aug 2001 Location: KUL, Malaysia Posts: 3,370 I will assume "...are just prety standard" to mean that your tables are of the type MyISAM. With a MyISAM table, there is NO data integrity check made by MySQL for foreign keys; you can set it up but it's useless. Examples usually help to explain much better, so here is an example of 3 MyISAM tables and how you normally would insert the primary key from one into another as the 'foreign key'. Code: # Create the MEMBER table CREATE TABLE `member` ( `id` int(10) unsigned NOT NULL default '0', `firstname` varchar(50) NOT NULL default '', PRIMARY KEY (`id`) ) TYPE=MyISAM; # Create the DOMAIN table C
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MySQL DB mysql> DROP DATABASE bank_db NOTE: Always drop DB using DROP DATABASE. InnoDB DB cannot be removed by deleting the corresponding directory Do not manually add files to the the Database directory (e.g. c:\mysql\data\app_db). DROP DATABASE will remove all table files but the drop statement will fail: ERROR 1010 (HY000): Error dropping database (can't rmdir '.\test\', errno: 17) Create and Loading Data in MySQL mysql> CREATE TABLE user_profile (first_name VARCHAR(20), last_name VARCHAR(20), sex CHAR(1), answer CHAR(1), dob DATE); mysql> LOAD DATA INFILE '/mydata/profile.txt' INTO TABLE user_profile LINES TERMINATED BY '\r\n'; # For Windows line terminator profile.txt Field is separated by a single tab \N stands for NULL value \ to escape character Jonathan Chan m \N 1980-11-11 Jane Smith f bike 1977-10-30 Suspense MySQL Index when Loading Data for MyISAM Table Disabling Index can speed up the loading process signficantly Lockdown the table from read & write Flush the table data mysql> FLUSH TABLES; Disable index % myisamchk --keys-used=0 -rq /path/to/my_db/my_tbl Load data with LOAD DATA INFILE Enable index mysql> myisamchk -rq /path/to/my_db/my_tbl Flush the table data mysql> FLUSH TABLES; Turn On or Off Unique & Foreign Constraints in MySQL Data loading can be speed up by turning unique and foreign constraints off temporarily mysql> SET unique_checks=0; mysql> SET foreign_key_checks=0; ... LOAD DATA HERE ... mysql> SET unique_checks=1; mysql> SET foreign_key_checks=1; Turn autocommit off for InnoDB Tables To speed up data loading for InnoDB, turn off autocommit during data loading mysql> SET autocommit=0; ... LOAD DATA INFILE ... mysql> COMMIT; Show MySQL Table Information Show information on the tables and tablespace (if any) mysql> SHOW TABLE STATUS FROM app_db\G Truncate MySQL Table Data Dropping table data mysql> TRUNCATE TABLE tbl; MySQL Table Creation (Example) mysql> CREATE TABLE emp_profile ( emp_id INT(10) UNSIGNED DEFAULT NOT NULL, comp_id INT(10) UNSIGNED DEFAULT NOT NULL, dept_no INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL, detail CHAR(20) DEFAULT '' NOT NULL, salary DOUBLE(6,2) DEFAULT '0.00' NOT NULL, PRIMARY KEY(article, dealer)); mysql> CREATE TABLE order_items ( order_id INT UNSIGNED NOT NULL REFERENCES orders(id), i