Written
In CFv5 RC4 the query generated by a DB Read action isn't shown in the debugger output. Here's a way to show it.
In a Custom Code action in the On Submit event of your form temprarily add a Custom Code action with this PHP in it:
<?php
pr(\GCore\Models\MODEL_NAME::getInstance()->dbo->log);
?>
Replace MODEL_NAME with the model name set in the DB Read action. This will then display a list of queries, the last is the one executed by the DB Read action.
When you are finished debugging either comment out the // pr(. . . line in the code or delete the Custom Code action
