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# db2_foreign_keys

(PECL)

db2_foreign_keys -- Returns a result set listing the foreign keys for a table

## Descrizione

resource db2_foreign_keys ( resource connection, string qualifier, string schema, string table-name )

Returns a result set listing the foreign keys for a table.

## Elenco dei parametri

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.

## Valori restituiti

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.

## Vedere anche:

db2_column_privileges()
db2_columns()
db2_primary_keys()
db2_procedure_columns()
db2_procedures()
db2_special_columns()
db2_statistics()
db2_table_privileges()
db2_tables()

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