#class pq\Gateway\Table\Identity
 implements Countable, ITeratorAggregate

The primary key of a table.

Query:#

The following query is executed by the current executor of the table to retrieve the primary key columns:

select
 a.attname as column
from  pg_class     c
 join pg_index     i  on c.oid    = i.indrelid
 join pg_attribute a  on c.oid    = a.attrelid
where 
     c.relname = \$1
 and a.attnum  = any(i.indkey)
 and i.indisprimary
order by 
 a.attnum

Cache:#

The result of this query is cached in the metadata cache under the following key, where $table is converted to a string by pq\Gateway\Table::__toString():

"$table:identity"

Properties:#

• protected array $columns#
  The columns making up the primary key of the table.

Functions:#

• Identity::__construct#

  Lookup the primary key of a table.

  void pq\Gateway\Table\Identity::__construct(pq\Gateway\Table $table)

• Identity::count#

  Implements Countable.

  int pq\Gateway\Table\Identity::count()

• Identity::getColumns#

  Retrieve the columns of the table identity.

  array pq\Gateway\Table\Identity::getColumns()

• Identity::getIterator#

  Implements IteratorAggregate.

  ArrayIterator pq\Gateway\Table\Identity::getIterator()