How to read a db value into a form field?

I have a form where users can update their own data which is stored in a db. How can I read the right db-values and load it into form-fields as default values?
The db-table I want to used is called jos_comprofiler, which has several fields like id, username, email, telephone. Id corresponds with the Joomla-userid.
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In Chronoforms v4 I used the event DB Record Loader, where I opened table jos_comprofiler. DB Field was 'id' and in the advanced-tab I've added a PHP-where clause:
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<?php
$user =& JFactory::getUser();
echo "`id` = '{$user->id}'";
?>
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After this event, I could set default field values e.g. {username}.
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How do I do this in Chronoforms v7?

You need a "Read Data" action in the form page, setup the where conditions and make sure the data is retrieved, you can use the form debug to check the read data
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In the Read Data behaviors, make sure the "Populate fields" is enabled, your fields names should be in this format:

Read_data_model_name.table_field_name

Hi Max,
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The problem is how to use the WHERE condition. The table com_profiler contains all kinds of userdata, the field 'id' in this table corresponds with the id in the Joomla users-table. I want to select the userdata in table com_profiler corresponding to the current user-id, which (in CF4) I could find throughout the php-code I mentioned. I don't know how to do the same thing in CF7.
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Hans

in v7 you can use {user:id} to get the user's id, so use that in the where condition value:
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id = {user:id}

I've tried that. When I do that, the debugger result is:
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SELECT `gebruiker`.`id` AS `gebruiker.id`, `gebruiker`.`user_id` AS `gebruiker.user_id`, `gebruiker`.`alias` AS `gebruiker.alias`, `gebruiker`.`firstname` AS `gebruiker.firstname`, `gebruiker`.`middlename` AS `gebruiker.middlename`, `gebruiker`.`lastname` AS `gebruiker.lastname`, `gebruiker`.`hits` AS `gebruiker.hits`, `gebruiker`.`message_last_sent` AS `gebruiker.message_last_sent`, `gebruiker`.`message_number_sent` AS `gebruiker.message_number_sent`, `gebruiker`.`avatar` AS `gebruiker.avatar`, `gebruiker`.`avatarapproved` AS `gebruiker.avatarapproved`, `gebruiker`.`canvasapproved` AS `gebruiker.canvasapproved`, `gebruiker`.`canvasposition` AS `gebruiker.canvasposition`, `gebruiker`.`canvas` AS `gebruiker.canvas`, `gebruiker`.`approved` AS `gebruiker.approved`, `gebruiker`.`confirmed` AS `gebruiker.confirmed`, `gebruiker`.`lastupdatedate` AS `gebruiker.lastupdatedate`, `gebruiker`.`registeripaddr` AS `gebruiker.registeripaddr`, `gebruiker`.`cbactivation` AS `gebruiker.cbactivation`, `gebruiker`.`banned` AS `gebruiker.banned`, `gebruiker`.`banneddate` AS `gebruiker.banneddate`, `gebruiker`.`unbanneddate` AS `gebruiker.unbanneddate`, `gebruiker`.`bannedby` AS `gebruiker.bannedby`, `gebruiker`.`unbannedby` AS `gebruiker.unbannedby`, `gebruiker`.`bannedreason` AS `gebruiker.bannedreason`, `gebruiker`.`acceptedterms` AS `gebruiker.acceptedterms`, `gebruiker`.`acceptedtermsconsent` AS `gebruiker.acceptedtermsconsent`, `gebruiker`.`cb_telefoon` AS `gebruiker.cb_telefoon`, `gebruiker`.`cb_adres` AS `gebruiker.cb_adres`, `gebruiker`.`cb_woonplaats` AS `gebruiker.cb_woonplaats`, `gebruiker`.`cb_postcode` AS `gebruiker.cb_postcode`, `gebruiker`.`cb_lidmaatschap` AS `gebruiker.cb_lidmaatschap`, `gebruiker`.`cb_knltbnummer` AS `gebruiker.cb_knltbnummer`, `gebruiker`.`cb_mobiel` AS `gebruiker.cb_mobiel`, `gebruiker`.`cb_sterkteenkel` AS `gebruiker.cb_sterkteenkel`, `gebruiker`.`cb_sterktedubbel` AS `gebruiker.cb_sterktedubbel`, `gebruiker`.`cb_functie` AS `gebruiker.cb_functie`
FROM `jos_comprofiler` AS `gebruiker`
WHERE `gebruiker`.`id` IN ('');
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Notice that in the WHERE clause, after IN there's an empty value. Debugger says:
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Impossible WHERE noticed after reading const tables
​
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I also tried other combinations, same result.

there is a user logged in ?

also can you post a screenshot of your "where" setup ?

I test this form in the admin view, so I'm logged in as Admin.
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Hans

your where value is set as {user.id} but it should be {user:id}

Thx Max, I should read better. Now it works.
Now I'm trying to use the db-values as default value for the form fields. I my formfield I've added an advanced setting 'value & placeholder' and as value I've added:
{data:gebruiker.lastname} (where gebruiker.lastname is retrieved based on the query).
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However, the result is an empty field. Should I also use "data" in the brackets, of should I use another function here? And if so, why is it still empty?

When I use {gebruiker.lastname} it didn't work, but when I changed it to {var:gebruiker.lastname} it did.
Thanks for your help Max.
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Regards, Hans

I'm saying changed the "Field name" (Veldnaam) to

gebruiker.lastname

But your solution is also fine, but it will just auto populate with my solution!

I misunderstood, but I tried and (of course :-)) this also works. Thanks again.

In another form, I've stored the result of an checkboxes-field in a db-field, type varchar. Result is: ["value 1", "value 2"]. How do I retrieve this from the db as default values of a checkboxes formfield? I guess I have to use the dynamic options feature, but can't figure out how that works.

the same way you are doing it now