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Logging errors
The Database API throws exceptions on error, which can be caught by wrapping database operations in try {} catch() {} blocks, as shown in this example:
// The transaction opens here. $txn = $connection->startTransaction(); try { $id = $connection->insert('example') ->fields([ 'field1' => 'mystring', 'field2' => 5, ]) ->execute(); my_other_function($id); return $id; } catch (Exception $e) { // Something went wrong somewhere, so roll back now. $txn->rollBack(); // Log the exception to watchdog. \Drupal::logger('type')->error($e->getMessage()); }
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