De-duplicate truncate method of drivers

core/abstract/abstract_driver.php

@@ -71,6 +71,12 @@ abstract class Abstract_Driver extends \PDO implements Driver_Interface {
 	 */
 	public $table_prefix = '';
 
+	/**
+	 * Whether the driver supports 'TRUNCATE'
+	 * @var bool
+	 */
+	public $has_truncate = TRUE;
+
 	/**
 	 * PDO constructor wrapper
 	 *
@@ -607,17 +613,26 @@ abstract class Abstract_Driver extends \PDO implements Driver_Interface {
 		return $this->table_prefix.$str;
 	}
 
-	// -------------------------------------------------------------------------
-	// ! Abstract public functions to implement in child classes
 	// -------------------------------------------------------------------------
 
 	/**
 	 * Empty the passed table
 	 *
 	 * @param string $table
-	 * @return void
+	 * @return \PDOStatement
 	 */
-	abstract public function truncate($table);
+	public function truncate($table)
+	{
+
+		$sql = ($this->has_truncate)
+			? 'TRUNCATE '
+			: 'DELETE FROM ';
+
+		$sql .= $this->quote_table($table);
+
+		$this->statement = $this->query($sql);
+		return $this->statement;
+	}
 
 }
 // End of db_pdo.php

drivers/firebird/firebird_driver.php

@@ -65,6 +65,13 @@ class Firebird extends Abstract_Driver {
 	 */
 	protected $service = NULL;
 
+	/**
+	 * Firebird doesn't have the truncate keyword
+	 *
+	 * @var bool
+	 */
+	protected $has_truncate = FALSE;
+
 	/**
 	 * Open the link to the database
 	 *
@@ -118,21 +125,6 @@ class Firebird extends Abstract_Driver {
 		return $this->service;
 	}
 
-	// --------------------------------------------------------------------------
-
-	/**
-	 * Empty a database table
-	 *
-	 * @param string $table
-	 * @return \PDOStatement
-	 */
-	public function truncate($table)
-	{
-		// Firebird lacks a truncate command
-		$sql = 'DELETE FROM '.$this->quote_table($table);
-		$this->statement = $this->query($sql);
-		return $this->statement;
-	}
 
 	// --------------------------------------------------------------------------
 

drivers/mysql/mysql_driver.php

@@ -52,18 +52,5 @@ class MySQL extends Abstract_Driver {
 
 		parent::__construct($dsn, $username, $password, $options);
 	}
-
-	// --------------------------------------------------------------------------
-
-	/**
-	 * Empty a table
-	 *
-	 * @param string $table
-	 */
-	public function truncate($table)
-	{
-		$table = $this->prefix_table($table);
-		$this->query("TRUNCATE `{$table}`");
-	}
 }
 //End of mysql_driver.php

drivers/pgsql/pgsql_driver.php

@@ -40,19 +40,6 @@ class PgSQL extends Abstract_Driver {
 
 	// --------------------------------------------------------------------------
 
-	/**
-	 * Empty a table
-	 *
-	 * @param string $table
-	 */
-	public function truncate($table)
-	{
-		$sql = 'TRUNCATE "' . $table . '"';
-		$this->query($sql);
-	}
-
-	// --------------------------------------------------------------------------
-
 	/**
 	 * Get a list of schemas for the current connection
 	 *

drivers/sqlite/sqlite_driver.php

@@ -30,6 +30,13 @@ class SQLite extends Abstract_Driver {
 	 */
 	protected $statement;
 
+	/**
+	 * SQLite has a truncate optimization,
+	 * but no support for the actual keyword
+	 * @var bool
+	 */
+	protected $has_truncate = FALSE;
+
 	/**
 	 * Open SQLite Database
 	 *
@@ -44,23 +51,6 @@ class SQLite extends Abstract_Driver {
 		parent::__construct("sqlite:{$dsn}", $user, $pass);
 	}
 
-	// --------------------------------------------------------------------------
-
-	/**
-	 * Empty a table
-	 *
-	 * @param string $table
-	 */
-	public function truncate($table)
-	{
-		// SQLite has a TRUNCATE optimization,
-		// but no support for the actual command.
-		$sql = 'DELETE FROM "'.$table.'"';
-
-		$this->statement = $this->query($sql);
-
-		return $this->statement;
-	}
 
 	// --------------------------------------------------------------------------