Nested selection using Zend Db

Question

I have a query like

select empl.idemp ,(select em.firstnm from tbl_employeemaster em where em.idemp = empl.approvedby) as approvedby from tbl_empleaveapplication empl join tbl_employeemaster emp on empl.idemp = emp.idemp join tbl_leavemaster lvm on empl.idleavemaster = lvm.idleavemaster 

I need to use zend db to create this type of request

Answer 1

Here is how you can convert your string request to Zend_Db_Select

 class Empleaveapplication extends Zend_Db_Table_Abstract { protected $_name = 'tbl_empleaveapplication'; } $table = new Empleaveapplication(); // create sub query $subSql = $table->select() ->setIntegrityCheck(false) ->from(array('em' => 'tbl_employeemaster'), array('firstnm')) ->where('idemp = empl.approvedby', ''); // main query $sql = $table->select() ->setIntegrityCheck(false) ->from(array('empl' => 'tbl_empleaveapplication'), array('idemp', 'approvedby' => new Zend_Db_Expr('(' . $subSql . ')'))) ->joinInner(array('emp' => 'tbl_employeemaster'), 'empl.idemp = emp.idemp', array()) ->joinInner(array('lvm' => 'tbl_leavemaster'), 'empl.idleavemaster = lvm.idleavemaster', array());