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cffbb17480
Before MySQL 4.0.18, user-specified constraint names were ignored. Starting with MySQL 4.0.18, the specified constraint name was prepended with the schema name and '/'. Now we are transforming into a format where the constraint name is prepended with the dict_table_t::name and the impossible UTF-8 sequence 0xff. Generated constraint names will be ASCII decimal numbers. On upgrade, old FOREIGN KEY constraint names will be displayed without any schema name prefix. They will be updated to the new format on DDL operations. dict_foreign_t::sql_id(): Return the SQL constraint name without any schemaname/tablename\377 or schemaname/ prefix. row_rename_table_for_mysql(), dict_table_rename_in_cache(): Simplify the logic: Just rename constraints to the new format. dict_table_get_foreign_id(): Replaces dict_table_get_highest_foreign_id(). innobase_get_foreign_key_info(): Let my_error() refer to erroneous anonymous constraints as "(null)". row_delete_constraint(): Try to drop all 3 constraint name variants. Reviewed by: Thirunarayanan Balathandayuthapani Tested by: Matthias Leich
71 lines
2.7 KiB
Text
71 lines
2.7 KiB
Text
DROP TABLE IF EXISTS t1, t2;
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CREATE TABLE t1 (a <INT_COLUMN>,
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b <CHAR_COLUMN>,
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<CUSTOM_INDEX> (a)
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) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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CREATE TABLE t2 (a <INT_COLUMN>,
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b <CHAR_COLUMN>,
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FOREIGN KEY (a) REFERENCES t1(a)
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) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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SHOW CREATE TABLE t2;
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Table Create Table
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t2 CREATE TABLE `t2` (
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`a` int(11) DEFAULT NULL,
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`b` char(8) DEFAULT NULL,
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KEY `a` (`a`),
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CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`)
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) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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INSERT INTO t2 (a,b) VALUES (1,'a'),(2,'b');
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
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INSERT INTO t1 (a,b) VALUES (1,'c'),(2,'d');
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INSERT INTO t2 (a,b) VALUES (1,'a'),(2,'b');
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UPDATE t2 SET a=a+1;
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
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UPDATE t1 SET a=3 WHERE a=2;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
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DELETE FROM t1 WHERE a=2;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
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DELETE FROM t2 WHERE a=2;
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SELECT a,b FROM t1;
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a b
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1 c
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2 d
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SELECT a,b FROM t2;
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a b
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1 a
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DROP TABLE t1;
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ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails
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DROP TABLE t2;
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CREATE TABLE t2 (a <INT_COLUMN>,
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b <CHAR_COLUMN>,
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FOREIGN KEY (a) REFERENCES t1(a)
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ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
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SHOW CREATE TABLE t2;
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Table Create Table
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t2 CREATE TABLE `t2` (
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`a` int(11) DEFAULT NULL,
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`b` char(8) DEFAULT NULL,
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KEY `a` (`a`),
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CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`) ON DELETE CASCADE ON UPDATE CASCADE
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) ENGINE=<STORAGE_ENGINE> DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
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INSERT INTO t2 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d');
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`) ON DELETE CASCADE ON UPDATE CASCADE)
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INSERT INTO t1 (a,b) VALUES (3,'a'),(4,'a');
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INSERT INTO t2 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(4,'e'),(3,'a');
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UPDATE t1 SET a=a+1;
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SELECT a,b FROM t2;
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a b
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5 a
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5 a
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5 b
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5 c
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5 d
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5 e
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DELETE FROM t1 WHERE b='a' LIMIT 2;
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SELECT a,b FROM t2;
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a b
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `1` FOREIGN KEY (`a`) REFERENCES `test`.`t1` (`a`))
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DROP TABLE t2;
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DROP TABLE t1;
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