How to call wpdb in a WordPress plugin class

Question

How can I call the wpdb inside a plugin function defined in a class like this,

<?php

/*
*   Plugin Name: Test
*   Plugin URI: http://www.test.com/
*   Description: Test plugin for wordpress.
*   Version: 1.0.0
*   Author: Test
*   Author URI: http://test.me/
*/      

class Test {

    /*
    |------------------------------------
    | Constructor
    |------------------------------------
    */

    public function __construct() {

    }

    public function abc() {
        var_dump($wpdb);
    }
}

JayDeep Nimavat · Accepted Answer · 2014-03-13 07:50:55Z

3

It is a global variable, $wpdb, which is an instantiation of the class already set up to communication WordPress database. Always use the global $wpdb variable. (Remember to globalize $wpdb before using it in any custom functions.)

You need to use it like this.

global $wpdb;
//do something with it.

answered Mar 13, 2014 at 7:50

JayDeep Nimavat

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4 Comments

Anshad Vattapoyil Over a year ago

Where to put this in my class?

JayDeep Nimavat Over a year ago

at every places where you want to use if you using in any function than put it in function or else in class.

b_dubb Over a year ago

Given the code example above please indicate how to access that global variable from within the plugin class. Please show code.

b_dubb Over a year ago

You can pass the $wpdb global to your class when you instantiate the class ` $example = new exampleClass($wpdb);` Then in the constructor you can attach the $wpdb object to the class with $this->wpdb = $wpdb ` public function __construct($wpdb){ $this->wpdb = $wpdb; }`

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