db2_foreign_keys

    (PECL ibm_db2 >= 1.0.0)

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

    说明

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

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

    参数

    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.

    返回值

    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.

    参见

    • db2_column_privileges() - Returns a result set listing the columns and associated privileges for a table
    • db2_columns() - Returns a result set listing the columns and associated metadata for a table
    • db2_primary_keys() - Returns a result set listing primary keys for a table
    • db2_procedure_columns() - Returns a result set listing stored procedure parameters
    • db2_procedures() - Returns a result set listing the stored procedures registered in a database
    • db2_special_columns() - Returns a result set listing the unique row identifier columns for a table
    • db2_statistics() - Returns a result set listing the index and statistics for a table
    • db2_table_privileges() - Returns a result set listing the tables and associated privileges in a database
    • db2_tables() - Returns a result set listing the tables and associated metadata in a database

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