DBTNG sentence that sums a column from all rows of a specific user and dpm the total

Ricardo Castañeda

7/11/24, 6:31 AM

This is my table test_sum_expression with columns:

uid (int) Stores the UID of the user.
points (int) Stores a number.

I have this SQL sentence which SUMS all points from user with uid 1.

SELECT uid, SUM(points) AS total_points 
FROM `test_sum_expression` 
WHERE uid = 1
GROUP BY UID;

Which produces

How can I produce this same sentence in DBTNG (Database: The Next Generation) format? I mean something like this: $query = $connection->select('test_sum_expression', 'n')...

I have tried this

$query = $connection->select('test_sum_expression', 'n')
  ->fields('n', ['uid', 'points'])
  ->condition('n.uid', 1, '=')
  ->groupBy('n.uid');
$query->addExpression('SUM(n.points)', 'total_points');
$queryPoints = $query->execute();

dpm($queryPoints);

But without success, it produces $queryPoints Drupal\Core\Database\StatementWrapper#456238 (3). I need to be able to get the total_points.

1 + 0

database

Score:1

Drupal

apaderno

7/11/24, 8:15 AM

$query->execute() returns an object that implements StatementInterface. To get the table columns matching that query you need to either loop over that object or call one of the methods defined from that interface.

Since you are only interested to the sum of the points, I would use the following code.

$query = $connection->select('test_sum_expression')
  ->condition('uid', 1);

$query->addExpression('SUM(points)', 'total_points');

$total_points = $query->execute()->fetchField();

+ 2

Ricardo Castañeda

7/11/24, 1:30 PM

Thanks! Don't forget to declare the alias in the select sentence as it is in the addExpression, it returns an error. I have a question, if I use an alias is it required to use it in the condition and addExpression too?

apaderno

7/11/24, 2:17 PM

I am not sure you are referring to the alias associated to the expression. In that case, the alias can be only used in `addExpression()` as in `$select = $this->database->select('node__body', 't'); $select->addExpression('MAX(entity_id)'); $last = $select->execute()->fetchField();`. You can use the alias in `condition()` if the condition needs to check the value of that expression.

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EN: DBTNG sentence that sums a column from all rows of a specific user and dpm the total

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