Oracle Multiple queries with locked row - php

Question

I'm using ORACLE version 11g.
I would like to execute three queries "at the same time" and take care that if one or more of theses queries fails must return both tables to the previous state. These queries are one select to know if the selected row still being possible the make the action, and one update and one insert to do the action.
In my case I need to make an update on the same locked row (obviously no one else should be able to do the action to the same row) and later and insert on another table, only if the result of the select query confirm that the selected row still having the option to execute the action, so the queries will be like these approximately:
//this is the row I want to execute the action
$selectedIdFromTable1 = "1";
$query="SELECT attr1 FROM table1 WHERE attr1 = 'oldValueAttr1' AND id = selectedIdFromTable1";
$stmt = $this->oracleDB->prepare($query);
$stmt->bindValue(1, $attr1, "string");
$stmt->execute();
$result = $stmt->fetchColumn();
if($result->num_rows == 1){ //I'm still being able to do the action to the row because the row still having the oldValue
//So here the row must be locked to execute the update and the insert only once. Only one user should execute the update and the insert.
$query="UPDATE table1 SET attr1 = ? WHERE id == $selectedIdFromTable1";
$stmt = $this->oracleDB->prepare($query);
$stmt->bindValue(1, 'newValueAttr1', "string");
$stmt->execute();
$query="INSERT INTO table2 (attr2) VALUES (?)";
$stmt = $this->oracleDB->prepare($query);
$stmt->bindValue(1, 'newValueAttr2', "string");
$stmt->execute();
}
//here the lock can release the row for future actions (but not this one, because if any one tries the previous select should not find anymore the selected row)
Also I'm using the binding system to send the variables more safety. Not sure If can affect the answer.
I'm quite sure that a transaction with locking row is the answer and if it's the answer, I will really appreciate to receive your help with an example of a transaction with Oracle with an example of this situation.
All of that, will be in a Symfony 3.3 project. Probably is not necessary this last information, but the transaction code must be in the symfony project and not in the oracle database for different reasons.
Thank you very much.

Answer 1

If you will use symfony you will most likely use the DBAL connection.
Transactions are handled as described in its documentation
(To me it seems more a transaction feature than a locking one)
Transactions:
$conn->beginTransaction();
try{
// do stuff
$conn->commit();
} catch (\Exception $e) {
$conn->rollBack();
throw $e;
}
Locking is not handled by DBAL