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db2_foreign_keys

(PECL ibm_db2 >= 1.0.0)

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

Опис

db2_foreign_keys(
    resource $connection,
    ?string $qualifier,
    ?string $schema,
    string $table_name
): resource

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

Параметри

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.

Значення, що повертаються

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.

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