bebeboutik/modules/ant_supplierdemand/ant_supplierdemand.php

<?php
if (!defined('_PS_VERSION_'))
    exit;

class Ant_Supplierdemand extends Module
{

    public function __construct()
    {
        $this->name = 'ant_supplierdemand';
        $this->tab = 'administration';
        $this->author = 'Antadis';
        $this->version = '1.0';
        $this->need_instance = 0;

        parent::__construct();

        $this->displayName = $this->l('Administration of supplier demands');
        $this->description = $this->l('Track every request made to suppliers.');
    }

    public function install()
    {
        if (!$this->installDB()){
            return false;
        }

        if(!(parent::install())) {
            return false;
        }
        return true;
    }

    public function uninstall() {

        if(parent::uninstall() == false) {
            return false;
        }

        return true;
    }

    private function installDB()
    {
        $result = true;
        # Add tables
        $query = '
            CREATE TABLE IF NOT EXISTS `' . _DB_PREFIX_ . 'supplier_demand` (
                `id_supplier_demand` INTEGER NOT NULL AUTO_INCREMENT,
                `id_order` INTEGER NOT NULL,
                `id_order_detail` INTEGER NOT NULL,
                `qty` INTEGER NOT NULL,
                `id_state` INTEGER NOT NULL DEFAULT 1,
                `comment` TEXT,
                `solution` INTEGER NOT NULL DEFAULT 0,
                `date_add` DATETIME NOT NULL,
                `date_upd` DATETIME NOT NULL,
                PRIMARY KEY(`id_supplier_demand`)
            ) ENGINE=' . _MYSQL_ENGINE_ . ' DEFAULT CHARSET=utf8
        ';

        $result = Db::getInstance()->Execute($query);

        $query = '
            CREATE TABLE IF NOT EXISTS `' . _DB_PREFIX_ . 'supplier_demand_history` (
                `id_supplier_demand_history` INTEGER NOT NULL AUTO_INCREMENT,
                `id_supplier_demand` INTEGER NOT NULL,
                `id_employee` INTEGER NOT NULL,
                `id_state` INTEGER NOT NULL,
                `date_add` DATETIME NOT NULL,
                PRIMARY KEY(`id_supplier_demand_history`)
            ) ENGINE=' . _MYSQL_ENGINE_ . ' DEFAULT CHARSET=utf8
        ';

        $result = (Db::getInstance()->Execute($query) and $result);

        return $result;
    }


}