diff --git a/system/database/drivers/pdo/pdo_driver.php b/system/database/drivers/pdo/pdo_driver.php
index c27607e..2da9cf3 100644
--- a/system/database/drivers/pdo/pdo_driver.php
+++ b/system/database/drivers/pdo/pdo_driver.php
@@ -311,52 +311,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Update_Batch statement
-	 *
-	 * Generates a platform-specific batch update string from the supplied data
-	 *
-	 * @param	string	$table	Table name
-	 * @param	array	$values	Update data
-	 * @param	string	$index	WHERE key
-	 * @return	string
-	 */
-	protected function _update_batch($table, $values, $index)
-	{
-		$ids = array();
-		foreach ($values as $key => $val)
-		{
-			$ids[] = $val[$index];
-
-			foreach (array_keys($val) as $field)
-			{
-				if ($field !== $index)
-				{
-					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
-				}
-			}
-		}
-
-		$cases = '';
-		foreach ($final as $k => $v)
-		{
-			$cases .= $k.' = CASE '."\n";
-
-			foreach ($v as $row)
-			{
-				$cases .= $row."\n";
-			}
-
-			$cases .= 'ELSE '.$k.' END, ';
-		}
-
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
-
-		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate 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 8377798..4eb7f0b 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_cubrid_driver.php
@@ -171,47 +171,6 @@
 	// --------------------------------------------------------------------
 
 	/**
-	 * Update_Batch statement
-	 *
-	 * Generates a platform-specific batch update string from the supplied data
-	 *
-	 * @param	string	$table	Table name
-	 * @param	array	$values	Update data
-	 * @param	string	$index	WHERE key
-	 * @return	string
-	 */
-	protected function _update_batch($table, $values, $index)
-	{
-		$ids = array();
-		foreach ($values as $key => $val)
-		{
-			$ids[] = $val[$index];
-
-			foreach (array_keys($val) as $field)
-			{
-				if ($field !== $index)
-				{
-					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
-				}
-			}
-		}
-
-		$cases = '';
-		foreach ($final as $k => $v)
-		{
-			$cases .= $k." = CASE \n"
-				.implode("\n", $v)."\n"
-				.'ELSE '.$k.' END), ';
-		}
-
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
-
-		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
 	 * Truncate statement
 	 *
 	 * Generates a platform-specific truncate string from the supplied data
diff --git a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
index 9483d24..05b8350 100644
--- a/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
+++ b/system/database/drivers/pdo/subdrivers/pdo_pgsql_driver.php
@@ -326,13 +326,13 @@
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
-			$ids[] = $val[$index];
+			$ids[] = $val[$index]['value'];
 
 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
+					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
 				}
 			}
 		}
@@ -340,12 +340,12 @@
 		$cases = '';
 		foreach ($final as $k => $v)
 		{
-			$cases .= $k.' = (CASE '.$index."\n"
+			$cases .= $k.' = (CASE '.$val[$index]['field']."\n"
 				.implode("\n", $v)."\n"
 				.'ELSE '.$k.' END), ';
 		}
 
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
+		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
 
 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
 	}
diff --git a/system/database/drivers/postgre/postgre_driver.php b/system/database/drivers/postgre/postgre_driver.php
index dfd87f9..51916fc 100644
--- a/system/database/drivers/postgre/postgre_driver.php
+++ b/system/database/drivers/postgre/postgre_driver.php
@@ -550,13 +550,13 @@
 		$ids = array();
 		foreach ($values as $key => $val)
 		{
-			$ids[] = $val[$index];
+			$ids[] = $val[$index]['value'];
 
 			foreach (array_keys($val) as $field)
 			{
 				if ($field !== $index)
 				{
-					$final[$field][] = 'WHEN '.$val[$index].' THEN '.$val[$field];
+					$final[$val[$field]['field']][] = 'WHEN '.$val[$index]['value'].' THEN '.$val[$field]['value'];
 				}
 			}
 		}
@@ -564,12 +564,12 @@
 		$cases = '';
 		foreach ($final as $k => $v)
 		{
-			$cases .= $k.' = (CASE '.$index."\n"
+			$cases .= $k.' = (CASE '.$val[$index]['field']."\n"
 				.implode("\n", $v)."\n"
 				.'ELSE '.$k.' END), ';
 		}
 
-		$this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
+		$this->where($val[$index]['field'].' IN('.implode(',', $ids).')', NULL, FALSE);
 
 		return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
 	}