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doctrine2/manual/docs/Object relational mapping - Indexes - Index options.php
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PHP

Doctrine offers many index options, some of them being db-specific. Here is a full list of availible options:
<code>
sorting => string('ASC' / 'DESC')
what kind of sorting does the index use (ascending / descending)
length => integer
index length (only some drivers support this)
primary => boolean(true / false)
whether or not the index is primary index
type => string('unique', -- supported by most drivers
'fulltext', -- only availible on Mysql driver
'gist', -- only availible on Pgsql driver
'gin') -- only availible on Pgsql driver
</code>
<code type="php">
class MultipleIndexTest extends Doctrine_Record
{
public function setTableDefinition()
{
\$this->hasColumn('name', 'string');
\$this->hasColumn('code', 'string');
\$this->hasColumn('age', 'integer');
\$this->index('myindex', array(
'fields' => array(
'name' =>
array('sorting' => 'ASC',
'length' => 10),
'code'),
'type' => 'unique',
));
}
}
?></code>