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<?php
namespace Drupal\Core\Database\Query;
use Drupal\Core\Database\Database;
use Drupal\Core\Database\Connection;
/**
* General class for an abstracted TRUNCATE operation.
*/
class Truncate extends Query {
/**
* The table to truncate.
*
* @var string
*/
protected $table;
/**
* Constructs a Truncate query object.
*
* @param \Drupal\Core\Database\Connection $connection
* A Connection object.
* @param string $table
* Name of the table to associate with this query.
* @param array $options
* Array of database options.
*/
public function __construct(Connection $connection, $table, array $options = []) {
$options['return'] = Database::RETURN_AFFECTED;
parent::__construct($connection, $options);
$this->table = $table;
}
/**
* {@inheritdoc}
*/
public function compile(Connection $connection, PlaceholderInterface $queryPlaceholder) {
return $this->condition->compile($connection, $queryPlaceholder);
}
/**
* {@inheritdoc}
*/
public function compiled() {
return $this->condition->compiled();
}
/**
* Executes the TRUNCATE query.
*
* @return
* Return value is dependent on the database type.
*/
public function execute() {
return $this->connection->query((string) $this, [], $this->queryOptions);
}
/**
* Implements PHP magic __toString method to convert the query to a string.
*
* @return string
* The prepared statement.
*/
public function __toString() {
// Create a sanitized comment string to prepend to the query.
$comments = $this->connection->makeComment($this->comments);
// In most cases, TRUNCATE is not a transaction safe statement as it is a
// DDL statement which results in an implicit COMMIT. When we are in a
// transaction, fallback to the slower, but transactional, DELETE.
// PostgreSQL also locks the entire table for a TRUNCATE strongly reducing
// the concurrency with other transactions.
if ($this->connection->inTransaction()) {
return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '}';
}
else {
return $comments . 'TRUNCATE {' . $this->connection->escapeTable($this->table) . '} ';
}
}
}