我有一个查询
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
我需要使用zend db来构建这种类型的查询
以下是将字符串查询转换为Zend_Db_Select的方法
原文链接：https://www.f2er.com/php/134850.htmlclass 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());
