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String String String String String String String String short
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Primary key table catalog being imported (may be null). Primary key table schema being imported (may be null). Primary key table name being imported. Primary key column name being imported. Foreign key table catalog (may be null). Foreign key table schema (may be null). Foreign key table name. Foreign key column name. Sequence number within a foreign key.
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Continued
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CHAPTER 9 WEB ACCESS TO METADATA, PART 2
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Table 9-3. Continued
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Name
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UPDATE_RULE
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short
Description
Specifies what happens to a foreign key when the primary key is updated: importedNoAction: Do not allow the update of the primary key if it has been imported. importedKeyCascade: Change the imported key to agree with the primary key update. importedKeySetNull: Change the imported key to NULL if its primary key has been updated. importedKeySetDefault: Change the imported key to default values if its primary key has been update. importedKeyRestrict: Same as importedKeyNoAction (for ODBC 2.x compatibility). Specifies what happens to the foreign key when the primary key is deleted: importedKeyNoAction: Do not allow deletion of the primary key if it has been imported. importedKeyCascade: Delete rows that import a deleted key. importedKeySetNull: Change the imported key to NULL if its primary key has been deleted. importedKeyRestrict: Same as importedKeyNoAction (for ODBC 2.x compatibility). importedKeySetDefault: Change the imported key to the default if its primary key has been deleted. Foreign key name (may be null). Primary key name (may be null). Specifies whether the evaluation of foreign key constraints can be deferred until commit: importedKeyInitiallyDeferred: See SQL-92 for definition. importedKeyInitiallyImmediate: See SQL-92 for definition. importedKeyNotDeferrable: See SQL-92 for definition.
DELETE_RULE
short
FK_NAME PK_NAME DEFERRABILITY
String String short
The parameters are catalog: A catalog name; must match the catalog name as it is stored in the database. "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search. schema: A schema name; must match the schema name as it is stored in the database. "" retrieves those without a schema; null means that the schema name should not be used to narrow the search. table: A table name; must match the table name as it is stored in the database.
MySQL Database Setup
In the current version of MySQL (version 4.0.18), only InnoDB table types support the foreign key concept. According to MySQL, starting with MySQL 5.1, foreign keys will be supported for all table types, not just InnoDB. Let s create two tables (dept_table and emp_table) and define the PK and FK. Keep in mind that if you violate the PK and FK rules, the SQL INSERT operation will fail.
CHAPTER 9 WEB ACCESS TO METADATA, PART 2
$ mysql --user=root --password=root Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 to server version: 4.0.18-nt mysql> use octopus; Database changed mysql> create table emps_table ( -> badge_number varchar(5) not null, -> name varchar(20) not null, -> email varchar(20) not null, -> -> primary key (badge_number) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> create table roles_table ( -> role varchar(5) not null, -> description varchar(25) not null, -> -> primary key (role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.13 sec) mysql> create table emps_roles ( -> badge_number varchar(5) not null, -> role varchar(5) not null, -> -> primary key (badge_number, role), -> INDEX badge_number_index (badge_number), -> foreign key (badge_number) references emps_table(badge_number), -> INDEX role_index (role), -> foreign key (role) references roles_table(role) -> ) TYPE=InnoDB; Query OK, 0 rows affected (0.24 sec) mysql> insert into roles_table(role, description) values('dba', 'database administrator'); mysql> insert into roles_table(role, description) values('mgr', 'database manager'); mysql> insert into roles_table(role, description) values('dev', 'database developer'); mysql> insert into emps_table(badge_number, name, email) values('11111', 'Alex', 'alex@yahoo.com'); mysql> insert into emps_table(badge_number, name, email) values('22222', 'Mary', 'mary@yahoo.com');
CHAPTER 9 WEB ACCESS TO METADATA, PART 2
mysql> insert into emps_roles(badge_number, role) values('11111', 'mgr'); mysql> insert into emps_roles(badge_number, role) values('11111', 'dev'); mysql> insert into emps_roles(badge_number, role) values('22222', 'dba'); mysql> insert into emps_roles(badge_number, role) values('22222', 'a'); ERROR 1216: Cannot add or update a child row: a foreign key constraint fails mysql> insert into emps_roles(badge_number, role) values('2222', 'a'); ERROR 1216: Cannot add or update a child row: a foreign key constraint fails mysql> select * from emps_table; +--------------+------+----------------+ | badge_number | name | email | +--------------+------+----------------+ | 11111 | Alex | alex@yahoo.com | | 22222 | Mary | mary@yahoo.com | +--------------+------+----------------+ 2 rows in set (0.02 sec) mysql> select * from roles_table; +------+------------------------+ | role | description | +------+------------------------+ | dba | database administrator | | dev | database developer | | mgr | database manager | +------+------------------------+ 3 rows in set (0.00 sec) mysql> select * from emps_roles; +--------------+------+ | badge_number | role | +--------------+------+ | 11111 | dev | | 11111 | mgr | | 22222 | dba | +--------------+------+ 3 rows in set (0.00 sec)
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