phpm.ru | Retrieves a list of foreign keys

Описание

odbc_foreignkeys ( resource $odbc , string|null $pk_catalog , string $pk_schema , string $pk_table , string $fk_catalog , string $fk_schema , string $fk_table ) : resource|false

Retrieves a list of foreign keys in the specified table or a list of foreign keys in other tables that refer to the primary key in the specified table

Список параметров

odbc: Идентификатор соединения ODBC, за подробностями обращайтесь к odbc_connect().
pk_catalog: The catalog ('qualifier' in ODBC 2 parlance) of the primary key table.
pk_schema: The schema ('owner' in ODBC 2 parlance) of the primary key table.
pk_table: The primary key table.
pk_catalog: The catalog ('qualifier' in ODBC 2 parlance) of the foreign key table.
fk_schema: The schema ('owner' in ODBC 2 parlance) of the foreign key table.
fk_table: The foreign key table.

Возвращаемые значения

Returns an ODBC result identifier или false в случае возникновения ошибки.

The result set has the following columns:

PKTABLE_CAT
PKTABLE_SCHEM
PKTABLE_NAME
PKCOLUMN_NAME
FKTABLE_CAT
FKTABLE_SCHEM
FKTABLE_NAME
FKCOLUMN_NAME
KEY_SEQ
UPDATE_RULE
DELETE_RULE
FK_NAME
PK_NAME
DEFERRABILITY

Драйверы могут сообщать дополнительные столбцы.

If the foreign keys associated with a primary key are requested, the result set is ordered by FKTABLE_CAT, FKTABLE_SCHEM, FKTABLE_NAME and KEY_SEQ. If the primary keys associated with a foreign key are requested, the result set is ordered by PKTABLE_CAT, PKTABLE_SCHEM, PKTABLE_NAME and KEY_SEQ.

If pk_table contains a table name, odbc_foreignkeys() returns a result set containing the primary key of the specified table and all of the foreign keys that refer to it.

If fk_table contains a table name, odbc_foreignkeys() returns a result set containing all of the foreign keys in the specified table and the primary keys (in other tables) to which they refer.

If both pk_table and fk_table contain table names, odbc_foreignkeys() returns the foreign keys in the table specified in fk_table that refer to the primary key of the table specified in pk_table. This should be one key at most.

Смотрите также

odbc_tables() - Get the list of table names stored in a specific data source
odbc_primarykeys() - Gets the primary keys for a table