Retrieves a list of foreign keys

说明

resource odbc_foreignkeys ( resource $connection_id , string $pk_qualifier , string $pk_owner , string $pk_table , string $fk_qualifier , string $fk_owner , string $fk_table )

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

参数

connection_id: ODBC 连接标识符，详见 odbc_connect()。
pk_qualifier: The primary key qualifier.
pk_owner: The primary key owner.
pk_table: The primary key table.
fk_qualifier: The foreign key qualifier.
fk_owner: The foreign key owner.
fk_table: The foreign key table.

返回值

Returns an ODBC result identifier 或者在失败时返回 FALSE.

The result set has the following columns:

PKTABLE_QUALIFIER
PKTABLE_OWNER
PKTABLE_NAME
PKCOLUMN_NAME
FKTABLE_QUALIFIER
FKTABLE_OWNER
FKTABLE_NAME
FKCOLUMN_NAME
KEY_SEQ
UPDATE_RULE
DELETE_RULE
FK_NAME
PK_NAME

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.