Question

I am using transactions in Magento.
I need to use primeryKey of first insert query to all my subsequent queries.

    $model1->setfield1()
           ->setField2();
    $transaction->addObject($model1);
    $connection    = Mage::getSingleton('core/resource')->getConnection('core_read');
    $lastInsertId  = $connection->fetchOne('SELECT last_insert_id()'); // return 0
    $model2->setfield3($lastInsertId )
    $model3->setfield4($lastInsertId )
    $transaction->addObject($model2);
    $transaction->addObject($model3);

    $transaction-Save();
    $lastInsertId2  = $connection->fetchOne('SELECT last_insert_id()'); // returns correct result

how to get last inserted id before saving the transaction

Answer 1

I guess PDO (which magento uses) can’t get last_inserted_id while transaction isn’t commited yet. I guess you should either try plain sql like there or try use nested transactions.