$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

How to Install MariaDB on RHEL-based Distros

GNU/Linux RHEL-based Installing MariaDB Guide

How to Install MariaDB Database Server on RHEL-based GNU/Linux Distributions.

And MariaDB for CentOS is One of the most Popular Database Servers in the World that’s Made by the Original Developers of MySQL and Guaranteed to stay Open Source.

How to Install MariaDB on CentOS GNU/Linux Distro

CentOS MariaDB Installation Guides