odbc_foreignkeys()
(PHP 4, PHP 5, PHP 7)
Retrieves a list of foreign keys
说明
odbc_foreignkeys(resource $connection_id,string $pk_qualifier,string $pk_owner,string $pk_table,string $fk_qualifier,string $fk_owner,string $fk_table): resource
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_tablecontains 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$fk_tablecontains a table name,odbc_foreignkeys() returns a result set containing all of the foreign keys in the specified table and the primary keys(in other tables)to which they refer.
If both$pk_tableand$fk_tablecontain table names,odbc_foreignkeys() returns the foreign keys in the table specified in$fk_tablethat refer to the primary key of the table specified in$pk_table. This should be one key at most.