How can I turn ZF ->joinLeft()s into a Subquery? - php

Question

How would i convert below query to sub query?
I don't want to use JOINS I want to do same through sub query. i-e I need three subqueries out of the three joins. How it would be possible for below query ?
protected $_name = 'sale_package_features';
public function getAllSalePackageFeatures(){
$sql = $this->select()->setIntegrityCheck(false)
->from(array('spf' => $this->_name))
->joinLeft(array('sd' => 'sale_devices'),'sd.sale_device_id = spf.sale_device_id',array('sd.sale_device_name AS deviceName'))
->joinLeft(array('sp' => 'sale_packages'),'sp.sale_package_id = spf.sale_package_id',array('sp.sale_package_name AS packageName'))
->joinLeft(array('sf' => 'sale_features'),'sf.sale_feature_id = spf.sale_feature_id',array('sf.sale_feature_name AS featureName'))
->where('sf.parent_id != ?',0)
->order('spf.sale_package_feature_id ASC');
return $sql->query()->fetchAll();
}
Edited :
SELECT
`spf`.*, `sd`.`sale_device_name` AS `deviceName`,
`sp`.`sale_package_name` AS `packageName`,
`sf`.`sale_feature_name` AS `featureName`
FROM `sale_package_features` AS `spf`
LEFT JOIN `sale_devices` AS `sd`
ON sd.sale_device_id = spf.sale_device_id
LEFT JOIN `sale_packages` AS `sp`
ON sp.sale_package_id = spf.sale_package_id
LEFT JOIN `sale_features` AS `sf`
ON sf.sale_feature_id = spf.sale_feature_id
WHERE (sf.parent_id != 0)
ORDER BY `spf`.`sale_package_feature_id` ASC

Answer 1

You can use
$dbAdapter = Zend_Db_Table::getDefaultAdapter();
$subSelect = $dbAdapter
->select()
->from( 'tablename',
array(
'col1_alias' => 'column1_name',
'col2_alias' => 'column2_name',
))
->where('somefield = ?', $value_to_be_quoted);
$select = $dbAdapter
->select()
->from(array('sub_alias' => $subSelect ))
->where('otherfield = ?', $other_value_to_be_quoted);
$sql = $select->assemble();
$sql will contain
SELECT
sub_alias . *
FROM
(SELECT
tablename.column1_name AS col1_alias,
tablename.column2_name AS col2_alias
FROM
tablename
WHERE
(somefield = 'quoted_value')) AS sub_alias
WHERE
(otherfield = 'quoted_other_value')
If you need to use SELECT .. WHERE x IN (subselect) than go with
$select->where( 'column IN (?)', new Zend_Db_Expr($subselect->assemble()) );