WORDPRESS UPDATE DB method not get called - php

Question

I am making a wordpress plugin, where I have functions in the main php file:
<?php
include_once "define.php";
include_once 'includes/form_processor.php';
include_once 'includes/email_subscriber.php';
include_once 'includes/options_page.php';
include_once 'includes/widget.php';
//register the plugin installation methods
register_activation_hook(__FILE__, 'install_simple_subscriber_plugin');
register_deactivation_hook(__FILE__, 'uninstall_simple_subscriber_plugin');
//register the plugin url
wp_enqueue_style('simple-email-subscriber-css', plugins_url('/simple_email_subscriber/stylesheets/style.css'));
function install_simple_subscriber_plugin(){
add_action('plugins_loaded', 'setup_plugin_actions');
email_subscriber::install_database();
email_subscriber::update_database();
}
function setup_plugin_actions(){
if(has_action('publish_post')){
$simple_email_subscriber = new email_subscriber();
//add action listener to post publication
add_action('publish_post', array($simple_email_subscriber, 'on_publish_post'));
add_action('publish__future_post', array($simple_email_subscriber, 'on_publish_post'));
}
//add the admin menu pages
$options_page = new options_page();
}
function uninstall_simple_subscriber_plugin(){
remove_action('plugins_loaded', 'setup_plugin_actions');
}
?>
AND in my custom class I have:
<?php
class email_subscriber{
/*
* Plugin Core Methods
* */
static function install_database() {
//define create table query
$sql = "CREATE TABLE IF NOT EXISTS ".SIMPLE_EMAIL_SUBSCRIBER_DB_NAME."(
id mediumint(9) NOT NULL AUTO_INCREMENT,
subscribe_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
email VARCHAR(55) NOT NULL,
UNIQUE KEY id (id)
);";
//update db and make it auto adjust
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);
}
//HERE IS THE NEW BITS ADDED TO THE EXISTING PLUGIN THAT'S NOT GET CALLED
static function update_database(){
$sql=
"DELIMITER $$
CREATE PROCEDURE Alter_Table()
BEGIN
DECLARE _count INT;
SET _count = ( SELECT COUNT(*)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'email_subscription' AND
COLUMN_NAME = 'subscribe_all');
IF _count = 0 THEN
ALTER TABLE ".SIMPLE_EMAIL_SUBSCRIBER_DB_NAME."
ADD COLUMN subscribe_all TINYINT(1) DEFAULT 1,
ADD COLUMN subscribe_category varchar(512) DEFAULT NULL;
END IF;
END $$
DELIMITER ;
CALL Alter_Table();
DROP PROCEDURE Alter_Table;
";
//update db and make it auto adjust
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);
//add the options for db defination
add_option("ses_db_version", SES_PLUGIN_VERSION);
}
.................and other codes
}
The update_database() method is the new method I added in, that's trying to update the database for extra functions. but it's never get run when the plugin activates.

Answer 1

You just want to execute that query.
global $wpdb;
$wpdb->query($sql);
dbDelta is used to create new tables or update existing ones to conform to an updated scheme. Simply put, it accepts a CREATE TABLE query and transforms it into an ALTER TABLE query if necessary. The Codex says:
The dbDelta function examines the current table structure, compares it
to the desired table structure, and either adds or modifies the table
as necessary, so it can be very handy for updates [...] Note that the
dbDelta function is rather picky, however.