WordPress Plugin Development tutorial from scratch (Part 15) About WordPress global $wpdb Object

In this video session i have explained about Global Worpdress variable $wpdb,WordPress defines a class called wpdb, which contains a set of functions used to interact with a database. Its primary purpose is to provide an interface with the WordPress database, but can be used to communicate with any other appropriate database.
WordPress provides a global object variable, $wpdb, which is an instantiation of the wpdb class defined in /wp-includes/wp-db.php. By default, $wpdb is instantiated to talk to the WordPress database. To access $wpdb in your WordPress PHP code, declare $wpdb as a global variable using the global keyword, or use the superglobal $GLOBALS in the following manner:
global $wpdb;

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Some operations using global $wpdb of wordpress,

$wpdb-query(” CUSTOM_QUERY FOR INSERT/UPDATE/DELETE “)

$wpdb-insert(“TABLE_NAME”,”DATA”)

$wpdb-udpate(“TABLE_NAME”,”DATA”);

$wpdb-delete(“TABLE_NAME”,”DATA”);

For More Details,
Please follow documentation Section of $wpdb of,
https://codex.wordpress.org/Class_Reference/wpdb

To make Ajax request Click here to learn:
By Method #1: https://www.youtube.com/watch?v=n_3nXW8VzgQ
By Method #2: https://www.youtube.com/watch?v=RAwahYG8Qfc

How we add custom javascript code to wordpress plugin page:
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Click here to watch:

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RECOMMENDATION:
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1. Some knowledge of PHP, HTML for this video series
2. How to Install WordPress: https://www.youtube.com/watch?v=MREgql9jmf0

Also you can learn WordPress Custom
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Theme Development: https://www.youtube.com/watch?v=MREgql9jmf0&list=PLT9miexWCpPV9WxY_QG3qxUGKzw54LboW
Widget Development: https://www.youtube.com/watch?v=ZSbdYG1svV8&list=PLT9miexWCpPUgibUXDZ7JP1j3U-m61U8m

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