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I am learning Plugins and I am trying to connect WordPress database wp-config.php in my Plugin PHP code. Currently for checking my code, I used the below connection and it is working fine. Now I converted it into a WordPress plugin so anyone can use this but now its time to make WordPress database connection. 

//Connection To DataBase
$host = "XXXXXXXXXXXXXX";
$username = "XXXXXXXXXX";
$password = "XXXXXXXXXX";
$dbname = "XXXXXXXXXXXX";
$connection = mysql_connect($host, $username, $password);
mysql_select_db($dbname);

So How to insert wp-config.php like something require_once(wp-config.php'); in plugin instead of above code to make WordPress SQL database connection in my plugin file?

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    If you want to make plugin in wordpress then you dont need to connect with database like we do in PHP. For example, you can check out default plugin of wordpress Hello World 's code. – Rohil_PHPBeginner Sep 26 '14 at 8:39
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    You don't want any connection while doing wordpress plugin. just use " global $wpdb;" and then use that $wpdb to create table,insert,update and all.. – Zammuuz Sep 26 '14 at 9:32
  • @Rohil_PHPBeginner Can you mention here what I ask...??? – Muhammad Hassan Sep 26 '14 at 10:27
  • @Ammu Nice tip but I am new so can you share the basic queries of $wpdb; to INSERT,UPDATE,DELETE,WHERE like $sql= "SELECT ID FROM wp_posts WHERE post_name = 'hello-world'"; in the answer... – Muhammad Hassan Sep 26 '14 at 10:30
  • Read whole page to get idea about $wpdb . – Rohil_PHPBeginner Sep 26 '14 at 10:50
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I found the answer my self. First open your wp-config.php and check the bottom of file that Is that contain the below code?...

if ( !defined('ABSPATH') )
    define('ABSPATH', dirname(__FILE__) . '/');

If yes then add the below code to make the connection in your plugin PHP files to connect with wp-config.php file that contain Database Name, Database UserName, Database Password, Database Host... ...

require_once(ABSPATH . 'wp-config.php');
$connection = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD);
mysqli_select_db($connection, DB_NAME);

And you will get connection to WordPress database...

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