Add a default _truncate() method to PDO
diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index ab1e4ce..3197e75 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -400,6 +400,24 @@
 		return $sql;
 	}
 
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 *
+	 * If the database does not support the truncate() command,
+	 * then this method maps to 'DELETE FROM table'
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _truncate($table)
+	{
+		return 'TRUNCATE TABLE '.$table;
+	}
+
 }
 
 /* End of file pdo_driver.php */
diff --git a/system/database/drivers/pdo/subdrivers/pdo_4d_driver.php b/system/database/drivers/pdo/subdrivers/pdo_4d_driver.php
index 893261b..b2e905c 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_4d_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_4d_driver.php
@@ -178,24 +178,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 *
-	 * If the database does not support the truncate() command,
-	 * then this method maps to 'DELETE FROM table'
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	protected function _truncate($table)
-	{
-		return 'TRUNCATE TABLE '.$table;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
index 2c5dd84..2cab0f4 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
@@ -165,6 +165,24 @@
 			.$index.' IN('.implode(',', $ids).')';
 	}
 
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 *
+	 * If the database does not support the truncate() command,
+	 * then this method maps to 'DELETE FROM table'
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _truncate($table)
+	{
+		return 'TRUNCATE '.$table;
+	}
+
 }
 
 /* End of file pdo_cubrid_driver.php */
diff --git a/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php
index a3e1181..fe9139a 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_dblib_driver.php
@@ -201,24 +201,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 *
-	 * If the database does not support the truncate() command,
-	 * then this method maps to 'DELETE FROM table'
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	protected function _truncate($table)
-	{
-		return 'TRUNCATE TABLE '.$table;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php b/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
index 1593ad4..c175f30 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_ibm_driver.php
@@ -213,24 +213,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 *
-	 * If the database does not support the truncate() command,
-	 * then this method maps to 'DELETE FROM table'
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	protected function _truncate($table)
-	{
-		return 'TRUNCATE TABLE '.$table;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
index dcab4ec..fd7f327 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php
@@ -193,6 +193,24 @@
 			.$index.' IN('.implode(',', $ids).')';
 	}
 
+	// --------------------------------------------------------------------
+
+	/**
+	 * Truncate statement
+	 *
+	 * Generates a platform-specific truncate string from the supplied data
+	 *
+	 * If the database does not support the truncate() command,
+	 * then this method maps to 'DELETE FROM table'
+	 *
+	 * @param	string	the table name
+	 * @return	string
+	 */
+	protected function _truncate($table)
+	{
+		return 'TRUNCATE '.$table;
+	}
+
 }
 
 /* End of file pdo_mysql_driver.php */
diff --git a/system/database/drivers/pdo/subdrivers/pdo_oci_driver.php b/system/database/drivers/pdo/subdrivers/pdo_oci_driver.php
index f728ce9..2b36086 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_oci_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_oci_driver.php
@@ -185,24 +185,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 *
-	 * If the database does not support the truncate() command,
-	 * then this method maps to 'DELETE FROM table'
-	 *
-	 * @param	string	the table name
-	 * @return	string
-         */
-	protected function _truncate($table)
-	{
-		return 'TRUNCATE TABLE '.$table;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php b/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
index a1865b5..dbf955c 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_sqlsrv_driver.php
@@ -230,24 +230,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Truncate statement
-	 *
-	 * Generates a platform-specific truncate string from the supplied data
-	 *
-	 * If the database does not support the truncate() command,
-	 * then this method maps to 'DELETE FROM table'
-	 *
-	 * @param	string	the table name
-	 * @return	string
-	 */
-	protected function _truncate($table)
-	{
-		return 'TRUNCATE TABLE '.$table;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Delete statement
 	 *
 	 * Generates a platform-specific delete string from the supplied data