diff --git a/core/abstract/abstract_driver.php b/core/abstract/abstract_driver.php
index 4d87f4e..6df590b 100644
--- a/core/abstract/abstract_driver.php
+++ b/core/abstract/abstract_driver.php
@@ -577,11 +577,17 @@ abstract class Abstract_Driver extends \PDO implements Driver_Interface {
 	 */
 	public function insert_batch($table, $data=array())
 	{
-		if ( ! is_array(current($data))) return NULL;
+		$first_row = current($data);
+		if ( ! is_array($first_row)) return NULL;
 
-		$vals = array(); // Values for insertion
+		// Values for insertion
+		$vals = array();
+		foreach($data as $group)
+		{
+			$vals = array_merge($vals, array_values($group));
+		}
 		$table = $this->quote_table($table);
-		$fields = array_keys(current($data));
+		$fields = array_keys($first_row);
 
 		$sql = "INSERT INTO {$table} ("
 			. implode(',', $this->quote_ident($fields))
@@ -592,13 +598,7 @@ abstract class Abstract_Driver extends \PDO implements Driver_Interface {
 		$param_string = "(" . implode(',', $params) . ")";
 		$param_list = array_fill(0, count($data), $param_string);
 
-		// For each grouping, add the values
-		foreach($data as $group)
-		{
-			$vals = array_merge($vals, array_values($group));
-		}
-
-		// Add the param groups
+		// Append the placeholder groups to the query
 		$sql .= implode(',', $param_list);
 
 		return array($sql, $vals);
diff --git a/core/abstract/abstract_util.php b/core/abstract/abstract_util.php
index af9ed48..a6d6b1d 100644
--- a/core/abstract/abstract_util.php
+++ b/core/abstract/abstract_util.php
@@ -65,12 +65,15 @@ abstract class Abstract_Util {
 	 * @param string $name
 	 * @param array $fields
 	 * @param array $constraints
+	 * @param bool $if_not_exists
 	 * @return string
 	 */
-	public function create_table($name, $fields, array $constraints=array())
+	public function create_table($name, $fields, array $constraints=array(), $if_not_exists=TRUE)
 	{
 		$column_array = array();
 
+		$exists_str = ($if_not_exists) ? ' IF NOT EXISTS ' : ' ';
+
 		// Reorganize into an array indexed with column information
 		// Eg $column_array[$colname] = array(
 		// 		'type' => ...,
@@ -103,7 +106,7 @@ abstract class Abstract_Util {
 		}
 
 		// Generate the sql for the creation of the table
-		$sql = 'CREATE TABLE IF NOT EXISTS '.$this->quote_table($name).' (';
+		$sql = 'CREATE TABLE'.$exists_str.$this->quote_table($name).' (';
 		$sql .= implode(', ', $columns);
 		$sql .= ')';
 
diff --git a/drivers/firebird/firebird_util.php b/drivers/firebird/firebird_util.php
index 6a513f2..9f711c3 100644
--- a/drivers/firebird/firebird_util.php
+++ b/drivers/firebird/firebird_util.php
@@ -38,37 +38,7 @@ class Firebird_Util extends Abstract_Util {
 	 */
 	public function create_table($name, $fields, array $constraints=array())
 	{
-		$column_array = array();
-
-		// Reorganize into an array indexed with column information
-		// Eg $column_array[$colname] = array(
-		// 		'type' => ...,
-		// 		'constraint' => ...,
-		// 		'index' => ...,
-		// )
-		foreach($fields as $colname => $type)
-		{
-			$column_array[$colname] = array();
-			$column_array[$colname]['type'] = ($type !== $colname) ? $type : '';
-		}
-
-		// Join column definitons together
-		$columns = array();
-		foreach($column_array as $n => $props)
-		{
-			$str = $this->quote_ident($n);
-			$str .= (isset($props['type'])) ? " {$props['type']}" : "";
-			$str .= (isset($props['constraint'])) ? " {$props['constraint']}" : "";
-
-			$columns[] = $str;
-		}
-
-		// Generate the sql for the creation of the table
-		$sql = 'CREATE TABLE '.$this->quote_table($name).' (';
-		$sql .= implode(', ', $columns);
-		$sql .= ')';
-
-		return $sql;
+		return parent::create_table($name, $fields, $constraints, FALSE);
 	}
 
 	/**