odbc_foreignkeys

(PHP 4, PHP 5, PHP 7, PHP 8)

odbc_foreignkeys — Retrieves a list of foreign keys

说明

odbc_foreignkeys(
    resource $odbc,
    ?string $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

参数

odbc: ODBC 连接标识符，详见 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.
fk_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.

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_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

Drivers can report additional columns.

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.

参见

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

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