Fix issue #1567
diff --git a/system/database/drivers/sqlsrv/sqlsrv_driver.php b/system/database/drivers/sqlsrv/sqlsrv_driver.php
index 12482de..3a4fc0a 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_driver.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_driver.php
@@ -143,7 +143,7 @@
*/
protected function _execute($sql)
{
- return (is_write_type($sql) && stripos($sql, 'INSERT') === FALSE)
+ return ($this->is_write_type($sql) && stripos($sql, 'INSERT') === FALSE)
? sqlsrv_query($this->conn_id, $sql)
: sqlsrv_query($this->conn_id, $sql, NULL, array('Scrollable' => SQLSRV_CURSOR_STATIC));
}