compare and update database records at once.

hi all
em new in dis language so not know much.
i have code in wich i get an array and then save it in my database
using this code in my controller.

foreach($file['NewDataSet']['Products'] as $products):
{
$tp['text']=$products[1];
$tp['date']=$products[2];
$this->model->saveall($tp);
}endforeach;

bt now i want to match this $file data with the existing records in
database. if it match then update that record else make a new entry..

how can i do this.
actually i dnt know how to compare my $file data with my database
records.

so please help comment anything with which i can complete my code.
give me any example or any method

thanks in advance..

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