Batch insert and arithmetic subtraction Yii 2 - php

Question

I have this function that doesn't batch insert to my database, I only used the batch insert function recently because back then I only used object inserts through for loops like this
$subject = ActiveCurriculum::find()
->select('scstock.*')
->joinWith('schead')
->where(['schead.TrNo' => $TrNo])
->one();
$activesubject = new ActiveSubject();
$activesubject->clientid = $clientid;
$activesubject->TrNo = $subject->TrNo;
$activesubject->LINE = $subject->LINE;
$activesubject->period = $subject->schead->period;
$activesubject->subjectcode = $subject->subjectcode;
$activesubject->schedday = $subject->schedday;
$activesubject->schedtime = $subject->schedtime;
//remember to use schead if the value is joined from another table.
$activesubject->section = $subject->schead->section;
$activesubject->roomcode = $subject->roomcode;
$activesubject->units = $subject->units;
$activesubject->save();
//reduces the slot of ccsubject by 1
$subject->slots = $subject->slots - 1;
//never forget the saving part
$subject->save();
I am not able to use this this time because I needed to insert an array of values so as I said I opted to this.
$subjects = ActiveCurriculum::find()
->select(['scstock.*', 'schead.*'])
->leftJoin('schead', 'schead.TrNo = scstock.TrNo')
->where(['sectiongroup' => $group])
->asArray()
->all();
// $activesubject = new ActiveSubject();
$bulkInsertArray = [];
foreach ($subjects as $values) {
$bulkInserArray[] = [
'clientid' => $clientid,
'TrNo' => $values['TrNo'],
'LINE' => $values['LINE'],
'period' => $values['period'],
'subjectcode' => $values['subjectcode'],
'schedday' => $values['schedday'],
'schedtime' => $values['schedtime'],
'section' => $values['section'],
'roomcode' => $values['roomcode'],
'units' => $values['units'],
];
if (count($bulkInsertArray) > 0) {
$columnNameArray = ['clientid', 'TrNo', 'LINE', 'period', 'subjectcode', 'schedday', 'schedtime', 'section', 'roomcode', 'units'];
// below line insert all your record and return number of rows inserted
$insertCount = Yii::$app->db->createCommand()
->batchInsert('subjectcontainer', $columnNameArray, $bulkInsertArray)
->execute();
}
}
But I am not able to
$subject->slots = $subject->slots - 1;
$subject->save();
like in the first one because of the arrays, can you tell me how to do this in my second code because I need to subtract the slots column by 1 every iteration of the for loop this time. Thank you.

Answer 1

You can perform subtraction using single query. Something like this:
$columnToUpdate = ['slots' => new \yii\db\Expression('[[slots]] - 1')];
$condition = ['sectiongroup' => $group];
ActiveCurriculum::updateAll( $columnToUpdate, $condition );
It will execute SQL:
UPDATE `active_curriculum` SET `slots`=`slots` - 1 WHERE `sectiongroup`=1234
You just need to make correct condition that correctly selects necessary rows. Alternatively, you can collect primary keys of records (IDs) when you prepare $bulkInserArray and use them for condition:
$condition = ['id' => $subjectIDsToUpdate];
This condition will build id IN (...) automatically.