Question

I am using innoDB based Database. How I can use the Transaction to save the data.

I have an array of users. But only saves the last record in the database. I can not use saveAll, because I have to save the data in multiple tables and all of them are interrelated.

I even can not define the model association-ship because there are huge number of entries in my database. So each time join will perform.

Please suggest how I can use the Transaction concept?

Answer 1

All transactions are performed on the current DataSource object.

Firstly you need to get it (in the model):

$dataSrc = $this->getDataSource();

This method returns the DataSource object that is currently bound to the Model.

Then you can use the DataSource Object’s methods to begin, commit or rollback transactions:

$dataSrc->begin();
//Do something 

if (/*Everything is nice?*/) {
    $dataSrc->commit();
} else {
    //Bad things have happened
    $dataSrc->rollback();
}

You will have to implement your own logic of course. Since Cake 2.2 you can also do real nested transactions. A “nested transaction” according to Wikipedia is:

A nested transaction occurs when a new transaction is started by an
instruction that is already inside an existing transaction. The new
transaction is said to be nested within the existing transaction,
hence the term. Nested transactions are implemented differently in
different databases. However, they have in common that the changes are
not made visible to any unrelated transactions until the outermost
transaction has committed. This means that a commit in an inner
transaction does not necessary persist updates to the database.

Of course all this is dependent on the Database you’re using. MySQL InnoDB transactional storage engine does support transactions.

And another clarification in response to this comment:

Yes, I am using $this->Model->saveAll($this->request->data,
array(‘deep’ => true) in my controller. This is written under a
foreach loop. And only the last foreach record is going to be saved
into the database. – Arun Jain

$this->Model->saveAll(); does NOT need to be run in a loop! It will manage things for you “automagically”. Take it out of the loop.
Furthermore your question was concerning transactions, not saving data with saveAll(). Model::saveAll() is just a wrapper for saveMany() and saveAssociated() – it will choose which method to use depending on the type of Model association.

Read the Cake Book it is all very well explained there…