Accessing a WordPress Database from a mobile app

I have a WordPress website with custom tables that I store data into that was entered by customers. The site owner wants to develop a barcode app that can  access this data.  When I need the data from these fields to display within the site,  I request it from a PHP script running on the server that make calls like
get_post_meta()

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The owner has hired a mobile app consultant who believes that, if he just has the password to the account where the site is hosted,  he can access all of these database fields from the app.

 I'm not seeing how this is possible. My understanding is that a mobile app can only access a site by making HTTP requests to it. It has no way of running on the server and executing things  like
get_post_meta()

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  Am I missing something?

Thanks
stevaAsked:
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Edward JimenezConnect With a Mentor IT Professional/WP DeveloperCommented:
Hi Steva,

The app can read values using standard SQL query statements, something like this:

select * from wp_2_postmeta;

Now, I'm not saying this is what the approach the consultant will take, but this is just to show that it is possible to get those values.
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Edward JimenezIT Professional/WP DeveloperCommented:
Hi Steve,

If the mobile app consultant has credentials to login to where the actual site is hosted, it is possible to get the requested information directlly from the database, by passing WordPress.

Another solution to create a mobile app with WordPress is using a software called phoneGap.  it will take your WordPress site and create a mobile app both for Andriod and Ios.
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stevaAuthor Commented:
Thanks for responding, Edward.  The consultant does have credentials to log into to site server, but could you explain how they would then read, for example,  values stored in the wp_2_postmeta table?  I do it with my code that runs in the server by calling WordPress' get_post_meta().  How is an app that comes in on HTTP going to do that?
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stevaAuthor Commented:
Thanks.  On a different subject, since you seem to have some experience with mobile apps, and I'm talking to you, you mentioned phoneGap that will create Android and IOS apps from a WordPress site.  I've been looking for software that is  to mobile apps what Wix and Weebly are to HTML.  I just want a simple mobile app that will scan a barcode and pass the number to my site with an HTTP request, but I don't want to learn Android and IOS app development to write it.  It seems there should be something out there to let me drag and drop my way to a simple app like that.  Do you know of anything?

Thanks.
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Edward JimenezIT Professional/WP DeveloperCommented:
Hi Steva,

To get the barcode scanner functionality, I would recommend a plugin.  Here is one, but it has not been updated for 2 years:
https://codecanyon.net/item/order-barcodes-for-woocommerce/9745632?s_rank=3

You'll have to search around for a plugin that works for you.  

As for the mobile app, there are few changes that you have to make to your WordPress site or any web site for the phoneGap platform to be able to convert it to a mobile app.  Here is the phoneGap site that you want:

https://build.phonegap.com/

and here are the steps:
https://premium.wpmudev.org/blog/creating-a-mobile-app-for-your-wordpress-site-a-diy-guide/
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stevaAuthor Commented:
Thanks for all the information!
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