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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.

Return Values

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.