insert table in WordPress database - php

Question

I want to insert a table into WordPress database while plugin activated. I have used this code but it is not working. This code should create a table while plugin gets activated, but in my WordPress when I activate the plugin, the code works, but table is not being created in the database.
How can I create the table in WordPress database while plugin activated?
I have use the below code for my plugin
class createtabel {
function __construct() {
register_activation_hook( __FILE__, 'create_plugin_database_table' );
}
public static function create_plugin_database_table() {
global $wpdb;
$table_name = $wpdb->prefix . 'wp_productqa';
$sql = "CREATE TABLE $table_name (
QA_id mediumint(9) unsigned NOT NULL AUTO_INCREMENT,
Product_ID varchar(50) NOT NULL,
Username varchar(50)NOT NULL,
Useremail varchar(50) NOT NULL,
comment varchar(255) NOT NULL,
PRIMARY KEY (QA_id)
);";
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $sql );
}
}

Answer 1

You have to make sure register_activation_hook is called.
For instance, in your plugin definition file you may:
$createTable = new createtabel;
register_activation_hook(__FILE__, array($createTable, 'create_plugin_database_table'));
BTW, in the createtabel class you can create your table with:
$wpdb->query($sql);
Is that your intention also to have
$table_name = $wpdb->prefix . 'wp_productqa';
which in most likelihood (assuming prefix is wp_)will have:
$table_name = 'wp_wp_productqa';

Answer 2

Please use this code while activate your plugin it will create new table in your database.
register_activation_hook(__FILE__, 'install_covercarousel');
Define this above hook in globally where your file coding has been started.
Also please dont' use public static function just add function and functioname like this function abs(){}
After changed code look like this
register_activation_hook( __FILE__, 'create_plugin_database_table' );
function create_plugin_database_table() {
global $wpdb;
$table_name = $wpdb->prefix . 'wp_productqa';
$sql = "CREATE TABLE $table_name (
QA_id mediumint(9) unsigned NOT NULL AUTO_INCREMENT,
Product_ID varchar(50) NOT NULL,
Username varchar(50)NOT NULL,
Useremail varchar(50) NOT NULL,
comment varchar(255) NOT NULL,
PRIMARY KEY (QA_id)
);";
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $sql );
}