yii行的求和值

Question

I have a table where i store the userId, and points. Everytime a user uses a transaction, they will be awarded points and these points are stored in UserPoints. It will post new rows for each transaction.

id | userId | points

1 2 38

2 18 50

3 2 12

4 10 13

5 15 15

like the table above, userID 2 has multiple lines, i want to add all the value that userId 2 have. i want to put the calculation inside the model MUserTotal inside the variable totalPointsValue().

Here is what i have so far

public function totalPointsValue() {

    user = $this->userId;

}         

Answer 1

What you need is statical query .

Basically you create a relation ship on the user Class to the UserPoints of type STAT, and specify the criteria:

<?php
class User extends CActiveRecord
{
    public function relations()
    {
        return array(
            'points'=>array(
                self::STAT, // Declare this relation as statical
                'user_points', // The table where you are storing the points
                'userId', // The foreign key on that table
                'select' => "SUM(points)", // make it SUM instead of default COUNT
                'group' => "userId" // Group by this field when adding points
            ),
        );
    }
}

After that you can use the relationship as you would use any other:

<?php
$user = User::model()->findbyPk(1);
echo $user->points;

Answer 2

or if you need to create the model MUserTotal ... just create a view that contains the userId and sum of his points, and create the model for this view ... the query will be some thing like
select user_id, sum(points) from user_points group by user_id