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<?php
namespace Drupal\Core\Database\Driver\pgsql;
use Drupal\Core\Database\Query\Upsert as QueryUpsert;
/**
* PostgreSQL implementation of \Drupal\Core\Database\Query\Upsert.
*/
class Upsert extends QueryUpsert {
/**
* {@inheritdoc}
*/
public function execute() {
if (!$this->preExecute()) {
return NULL;
}
// Default options for upsert queries.
$this->queryOptions += [
'throw_exception' => TRUE,
];
// Default fields are always placed first for consistency.
$insert_fields = array_merge($this->defaultFields, $this->insertFields);
$table = $this->connection->escapeTable($this->table);
// We have to execute multiple queries, therefore we wrap everything in a
// transaction so that it is atomic where possible.
$transaction = $this->connection->startTransaction();
try {
// First, lock the table we're upserting into.
$this->connection->query('LOCK TABLE {' . $table . '} IN SHARE ROW EXCLUSIVE MODE', [], $this->queryOptions);
// Second, delete all items first so we can do one insert.
$unique_key_position = array_search($this->key, $insert_fields);
$delete_ids = [];
foreach ($this->insertValues as $insert_values) {
$delete_ids[] = $insert_values[$unique_key_position];
}
// Delete in chunks when a large array is passed.
foreach (array_chunk($delete_ids, 1000) as $delete_ids_chunk) {
$this->connection->delete($this->table, $this->queryOptions)
->condition($this->key, $delete_ids_chunk, 'IN')
->execute();
}
// Third, insert all the values.
$insert = $this->connection->insert($this->table, $this->queryOptions)
->fields($insert_fields);
foreach ($this->insertValues as $insert_values) {
$insert->values($insert_values);
}
$insert->execute();
}
catch (\Exception $e) {
// One of the queries failed, rollback the whole batch.
$transaction->rollBack();
// Rethrow the exception for the calling code.
throw $e;
}
// Re-initialize the values array so that we can re-use this query.
$this->insertValues = [];
// Transaction commits here where $transaction looses scope.
return TRUE;
}
/**
* {@inheritdoc}
*/
public function __toString() {
// Nothing to do.
}
}