odbc_foreignkeys
(PHP 4, PHP 5, PHP 7, PHP 8)
odbc_foreignkeys — Retrieves a list of foreign keys
說明
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
參數
-
odbc -
ODBC 連線識別符號，詳見 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 或者在失敗時返回 false.
The result set has the following columns:
PKTABLE_CATPKTABLE_SCHEMPKTABLE_NAMEPKCOLUMN_NAMEFKTABLE_CATFKTABLE_SCHEMFKTABLE_NAMEFKCOLUMN_NAMEKEY_SEQUPDATE_RULEDELETE_RULEFK_NAMEPK_NAMEDEFERRABILITY
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.
參見
- odbc_tables() - Get the list of table names stored in a specific data source
- odbc_primarykeys() - Gets the primary keys for a table