Can try-catch be used this way?

Question

PHP

For example, I have this code:

function foo() {

    # Начало транзакции

    try {
        # Одно обращение к БД
    } catch(PDOException $e) {
        throw new PDOException("Уточняющее сообщение: " . $e->getMessage());
    }

    try {
        # Другое обращение к БД
    } catch(PDOException $e) {
        throw new PDOException("Другое уточняющее сообщение: " . $e->getMessage());
    }

    # Коммит транзакции

}

To what extent is such a construction legal, and is it used at all?

Answer 1

It is better to create your own exception class hierarchy and throw them to make the code more readable, but in general, refining exceptions is a normal practice.

Answer 2

Can be used. But in 99% of cases it is not needed.
In this case, most likely. Expecting an exception in a transaction is bad practice. Most likely, either no refinements are needed, or the data was not validated before the start of the transaction.