How to catch fails in pdo batch insert - mysql

Question

I have this code to insert data from a CSV file to the database. Since, the CSV might have thousands of records, I am trying to implement a batch insert as follows.
$this->_connection->beginTransaction();
$sql = "INSERT INTO dbtable (col1,col2) VALUES (:value1,:value2)";
$stmt = $this->_connection->prepare($sql);
foreach ($requestArray['csv'] as $data) {
$stmt->bindParam(':value1', $data['csvCol1']);
$stmt->bindParam(':value2', $data['csvCol2']);
$stmt->execute();
}
$this->_connection->commit();
The variable $requestArray['csv'], holds all the record of the CSV post request. This code seems to be working as it should. Though, I am trying to improve it, because I want to let the user know how many records failed to insert on the database and if it is possible to show which records failed. Assume a duplicate key, or invalid data or generally any error that might come from this procedure.

Answer 1

PDOStatement::execute() will return false on failure:
$this->_connection->beginTransaction();
$sql = "INSERT INTO dbtable (col1,col2) VALUES (:value1,:value2)";
$stmt = $this->_connection->prepare($sql);
foreach ($requestArray['csv'] as $data) {
$stmt->bindParam(':value1', $data['csvCol1']);
$stmt->bindParam(':value2', $data['csvCol2']);
if (!$stmt->execute()) {
// error processing goes here.
}
}
$this->_connection->commit();