ZF2 custom db query using SUM - php

Question

Can someone give me a hint what I am doing wrong?
public function getPaymentSumByTypeAndProject($project_id,$type) {
$type = (int) $type;
$project_id = (int) $project_id;
$rowset = $this->tableGateway->select(array('total_amount' => new Expression('SUM(payment.amount)')))->where(array('type' => $type, 'project_id' => $project_id));
$row = $rowset->toArray();
if (!$row) {
throw new \Exception("Busted :/");
}
return $rowset;
}
I want to make the same query:
SELECT SUM(amount) FROM payment WHERE type='$type' AND project_id ='$project_id';
Edit:
I made small progress, i have figured out how to sum whole column
public function getPaymentSumByTypeAndProject($project_id, $type) {
$type = (int) $type;
$project_id = (int) $project_id;
$resultSet = $this->tableGateway->select(function (Select $select) {
$select->columns(array(new \Zend\Db\Sql\Expression('SUM(amount) as amount')))->where('type="0"');
});
return $resultSet;
Maybe someone could help me to figure out how to add condition: "WHERE type='$type' AND project_id='$project_id'" ?

Answer 1

I know this is an old question, but I came across it and figured I'd throw in my two cents:
public function getPaymentSumByTypeAndProject($project_id, $type) {
// This TableGateway is already setup for the table 'payment'
// So we can skip the ->from('payment')
$sql = $this->tableGateway->getSql();
// We'll follow the regular order of SQL ( SELECT, FROM, WHERE )
// So the query is easier to understand
$select = $sql->select()
// Use an alias as key in the columns array instead of
// in the expression itself
->columns(array('amount' => new \Zend\Db\Sql\Expression('SUM(amount)')))
// Type casting the variables as integer can take place
// here ( it even tells us a little about the table structure )
->where(array('type' => (int)$type, 'project_id' => (int)$project_id));
// Use selectWith as a shortcut to get a resultSet for the above select
return $this->tableGateway->selectWith($select);
}
Also, an adapter can be retrieved from a table gateway like this:
$adapter = $this->tableGateway->getAdapter();
But you don't really need it anymore when you select using the above mentioned method.

Answer 2

Ok now this is working, tell me is this how it;s should be done?
public function getPaymentSumByTypeAndProject($project_id, $type) {
$type = (int) $type;
$project_id = (int) $project_id;
$adapter = $this->tableGateway->adapter;
$sql = new Sql($adapter);
$select = $sql->select();
$select->from('payment');
$select->where(array('type'=>$type,'project_id'=>$project_id));
$select->columns(array(new \Zend\Db\Sql\Expression('SUM(amount) as amount')));
$selectString = $sql->getSqlStringForSqlObject($select);
$resultSet = $adapter->query($selectString, $adapter::QUERY_MODE_EXECUTE);
return $resultSet;
}

Answer 3

use This one
$select = $this->getSql()->select()
->columns(array('amount' => new \Zend\Db\Sql\Expression('SUM(amount)')))
->where("type ='$type'")
->where("project_id ='$project_id'");
$resultSet = $this->selectWith($select);
$row = $resultSet->current();
// echo $select->getSqlString();die; //check query use this line
if(!$row){
return False;
}
return $row->amount;

Answer 4

try to make like that instead of (int) $type
intval($type);
and
intval($project_id);
and in your sql
change your variables to
'".$type."'
AND
'".$project_id."'