(PECL ibm_db2 >= 1.0.0)
db2_foreign_keys — Returns a result set listing the foreign keys for a table
$connection
, string $qualifier
, string $schema
, string $table-name
)Returns a result set listing the foreign keys for a table.
connection
A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
qualifier
A qualifier for DB2 databases running on OS/390 or z/OS servers. For
other databases, pass NULL
or an empty string.
schema
The schema which contains the tables. If schema
is NULL
, db2_foreign_keys() matches the schema for
the current connection.
table-name
The name of the table.
Returns a statement resource with a result set containing rows describing the foreign keys for the specified table. The result set is composed of the following columns:
Column name | Description |
---|---|
PKTABLE_CAT | Name of the catalog for the table containing the primary key. The value is NULL if this table does not have catalogs. |
PKTABLE_SCHEM | Name of the schema for the table containing the primary key. |
PKTABLE_NAME | Name of the table containing the primary key. |
PKCOLUMN_NAME | Name of the column containing the primary key. |
FKTABLE_CAT | Name of the catalog for the table containing the foreign key. The value is NULL if this table does not have catalogs. |
FKTABLE_SCHEM | Name of the schema for the table containing the foreign key. |
FKTABLE_NAME | Name of the table containing the foreign key. |
FKCOLUMN_NAME | Name of the column containing the foreign key. |
KEY_SEQ | 1-indexed position of the column in the key. |
UPDATE_RULE | Integer value representing the action applied to the foreign key when the SQL operation is UPDATE. |
DELETE_RULE | Integer value representing the action applied to the foreign key when the SQL operation is DELETE. |
FK_NAME | The name of the foreign key. |
PK_NAME | The name of the primary key. |
DEFERRABILITY | An integer value representing whether the foreign key deferrability is SQL_INITIALLY_DEFERRED, SQL_INITIALLY_IMMEDIATE, or SQL_NOT_DEFERRABLE. |