Eduardo Marcolino

This ACF plugin makes it possible to store ACF data in structured database tables instead of WordPress core meta tables.
It uses ACF’s <code>acf/update_field_group</code> hook to create/update the database and then uses <code>acf/save_post</code> hook to store the data.
It was heavily inspired by Austin Ginder’s post <a href="https://anchor.host/acf-custom-fields-stored-in-custom-table/" rel="nofollow ugc">https://anchor.host/acf-custom-fields-stored-in-custom-table/</a>.
You can contribute to this plugin by submit PR/Issue in <a href="https://github.com/eduardo-marcolino/acf-fields-in-custom-table" rel="nofollow ugc">https://github.com/eduardo-marcolino/acf-fields-in-custom-table</a>.
<h4>Supported Fields</h4>
<ul>
<li>Text</li>
<li>Text Area</li>
<li>Number</li>
<li>Range</li>
<li>Email</li>
<li>URL</li>
<li>Password</li>
<li>Image</li>
<li>File</li>
<li>Wysiwyg Editor</li>
<li>oEmbed</li>
<li>Select</li>
<li>Checkbox</li>
<li>Radio Button</li>
<li>Button Group</li>
<li>True / False</li>
<li>Date Picker</li>
<li>Date Time Picker</li>
<li>Time Picker</li>
<li>Color Picker</li>
<li>Link</li>
<li>Post Object</li>
<li>Page Link</li>
<li>Relationship</li>
<li>Taxonomy</li>
<li>User</li>
</ul>
<h4>Relational Fields</h4>
This plugin supports the following relational field types: Post Object, Page Link, Relationship, Taxonomy and User.
It can store both single and multiple values based on the <code>multiple</code> option.
<ul>
<li>If it’s a single value field, then the column type will be <code>bigint(20) unsigned</code></li>
<li>If it’s a multiple value field, then the column type will be longtext and the date will be stored in json format.</li>
</ul>
You can query relational fields with multiple values using using MySQL’s function <a href="https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-contains" rel="nofollow ugc">JSON_CONTAINS</a>. 
Here is an example:
Table:
<pre><code>+---------+-------------------+--------+
| post_id | title | stores |
+---------+-------------------+--------+
| 1 | Lord of the Flies | [1,2] |
| 2 | The Island | [2] |
| 3 | 1984 | [3] |
+---------+-------------------+--------+
</code></pre>
Query:
<pre><code>SELECT * FROM wp_acf_books WHERE JSON_CONTAINS(stores, 2, '$')
</code></pre>
The query above will return “Lord of the Flies” and “The Island”.
<h4>ACF Compatibility</h4>
This plugin was tested with ACF 5 FREE Version .

ACF: Fields in Custom Table

Stores ACF custom fields in a custom table instead of WordPress core meta tables.

Andrew Fielden

Based upon the excellent Advanced Custom Fields, DataFlexor gives WordPress an easy to use way to create complex systems.
Rather than have to create a Custom Post Type for each post type simply take a single Custom Post Type and extend it with field groups. These can then be used to customize any post with both data and functionality.
With a hierarchy structure you can then create many systems from a help desk to a staff directory, in fact almost anything that has a need for a flexible data structure.
Please visit <a href="http://dataflexor.plugin.city/" rel="nofollow ugc">DataFlexor</a> for more information tips, upgrades and ideas.
=Compatibility= Requires <a href="https://wordpress.org/extend/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a> Version 4.0 or later.

DataFlexor

DataFlexor is a data management framework to allow easy extension of WordPress content.

ACF: Fields in Custom Table vs DataFlexor