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Edit: DbQuery.php

<?php
/**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 */

/**
 * SQL query builder.
 *
 * @since 1.5.0.1
 */
class DbQueryCore
{
    /**
     * List of data to build the query.
     *
     * @var array
     */
    protected $query = [
        'type' => 'SELECT',
        'select' => [],
        'from' => [],
        'join' => [],
        'where' => [],
        'group' => [],
        'having' => [],
        'order' => [],
        'limit' => ['offset' => 0, 'limit' => 0],
    ];

/**
     * Sets type of the query.
     *
     * @param string $type SELECT|DELETE
     *
     * @return $this
     */
    public function type($type)
    {
        $types = ['SELECT', 'DELETE'];

if (!empty($type) && in_array($type, $types)) {
            $this->query['type'] = $type;
        }

return $this;
    }

/**
     * Adds fields to SELECT clause.
     *
     * @param string $fields List of fields to concat to other fields
     *
     * @return $this
     */
    public function select($fields)
    {
        if (!empty($fields)) {
            $this->query['select'][] = $fields;
        }

return $this;
    }

/**
     * Sets table for FROM clause.
     *
     * @param string|DbQuery $table Table name
     * @param string|null $alias Table alias
     *
     * @return $this
     */
    public function from($table, $alias = null)
    {
        if (!empty($table)) {
            if ($table instanceof DbQuery) {
                $query = '(' . $table->build() . ')';
            } else {
                $query = '`' . _DB_PREFIX_ . $table . '`';
            }

$this->query['from'][] = $query . ($alias ? ' ' . $alias : '');
        }

return $this;
    }

/**
     * Adds JOIN clause
     * E.g. $this->join('RIGHT JOIN '._DB_PREFIX_.'product p ON ...');.
     *
     * @param string $join Complete string
     *
     * @return $this
     */
    public function join($join)
    {
        if (!empty($join)) {
            $this->query['join'][] = $join;
        }

return $this;
    }

/**
     * Adds a LEFT JOIN clause.
     *
     * @param string $table Table name (without prefix)
     * @param string|null $alias Table alias
     * @param string|null $on ON clause
     *
     * @return $this
     */
    public function leftJoin($table, $alias = null, $on = null)
    {
        return $this->join('LEFT JOIN `' . _DB_PREFIX_ . bqSQL($table) . '`' . ($alias ? ' `' . pSQL($alias) . '`' : '') . ($on ? ' ON ' . $on : ''));
    }

/**
     * Adds an INNER JOIN clause
     * E.g. $this->innerJoin('product p ON ...').
     *
     * @param string $table Table name (without prefix)
     * @param string|null $alias Table alias
     * @param string|null $on ON clause
     *
     * @return $this
     */
    public function innerJoin($table, $alias = null, $on = null)
    {
        return $this->join('INNER JOIN `' . _DB_PREFIX_ . bqSQL($table) . '`' . ($alias ? ' `' . pSQL($alias) . '`' : '') . ($on ? ' ON ' . $on : ''));
    }

/**
     * Adds a LEFT OUTER JOIN clause.
     *
     * @param string $table Table name (without prefix)
     * @param string|null $alias Table alias
     * @param string|null $on ON clause
     *
     * @return $this
     */
    public function leftOuterJoin($table, $alias = null, $on = null)
    {
        return $this->join('LEFT OUTER JOIN `' . _DB_PREFIX_ . bqSQL($table) . '`' . ($alias ? ' `' . pSQL($alias) . '`' : '') . ($on ? ' ON ' . $on : ''));
    }

/**
     * Adds a NATURAL JOIN clause.
     *
     * @param string $table Table name (without prefix)
     * @param string|null $alias Table alias
     *
     * @return $this
     */
    public function naturalJoin($table, $alias = null)
    {
        return $this->join('NATURAL JOIN `' . _DB_PREFIX_ . bqSQL($table) . '`' . ($alias ? ' `' . pSQL($alias) . '`' : ''));
    }

/**
     * Adds a RIGHT JOIN clause.
     *
     * @param string $table Table name (without prefix)
     * @param string|null $alias Table alias
     * @param string|null $on ON clause
     *
     * @return $this
     */
    public function rightJoin($table, $alias = null, $on = null)
    {
        return $this->join('RIGHT JOIN `' . _DB_PREFIX_ . bqSQL($table) . '`' . ($alias ? ' `' . pSQL($alias) . '`' : '') . ($on ? ' ON ' . $on : ''));
    }

/**
     * Adds a restriction in WHERE clause (each restriction will be separated by AND statement).
     *
     * @param string $restriction
     *
     * @return $this
     */
    public function where($restriction)
    {
        if (!empty($restriction)) {
            $this->query['where'][] = $restriction;
        }

return $this;
    }

/**
     * Adds a restriction in HAVING clause (each restriction will be separated by AND statement).
     *
     * @param string $restriction
     *
     * @return $this
     */
    public function having($restriction)
    {
        if (!empty($restriction)) {
            $this->query['having'][] = $restriction;
        }

return $this;
    }

/**
     * Adds an ORDER BY restriction.
     *
     * @param string $fields List of fields to sort. E.g. $this->order('myField, b.mySecondField DESC')
     *
     * @return $this
     */
    public function orderBy($fields)
    {
        if (!empty($fields)) {
            $this->query['order'][] = $fields;
        }

return $this;
    }

/**
     * Adds a GROUP BY restriction.
     *
     * @param string $fields List of fields to group. E.g. $this->group('myField1, myField2')
     *
     * @return $this
     */
    public function groupBy($fields)
    {
        if (!empty($fields)) {
            $this->query['group'][] = $fields;
        }

return $this;
    }

/**
     * Sets query offset and limit.
     *
     * @param int $limit
     * @param int $offset
     *
     * @return $this
     */
    public function limit($limit, $offset = 0)
    {
        $offset = (int) $offset;
        if ($offset < 0) {
            $offset = 0;
        }

$this->query['limit'] = [
            'offset' => $offset,
            'limit' => (int) $limit,
        ];

return $this;
    }

/**
     * Generates query and return SQL string.
     *
     * @return string
     *
     * @throws PrestaShopException
     */
    public function build()
    {
        if ($this->query['type'] == 'SELECT') {
            $sql = 'SELECT ' . ((($this->query['select'])) ? implode(",\n", $this->query['select']) : '*') . "\n";
        } else {
            $sql = $this->query['type'] . ' ';
        }

if (!$this->query['from']) {
            throw new PrestaShopException('Table name not set in DbQuery object. Cannot build a valid SQL query.');
        }

$sql .= 'FROM ' . implode(', ', $this->query['from']) . "\n";

if ($this->query['join']) {
            $sql .= implode("\n", $this->query['join']) . "\n";
        }

if ($this->query['where']) {
            $sql .= 'WHERE (' . implode(') AND (', $this->query['where']) . ")\n";
        }

if ($this->query['group']) {
            $sql .= 'GROUP BY ' . implode(', ', $this->query['group']) . "\n";
        }

if ($this->query['having']) {
            $sql .= 'HAVING (' . implode(') AND (', $this->query['having']) . ")\n";
        }

if ($this->query['order']) {
            $sql .= 'ORDER BY ' . implode(', ', $this->query['order']) . "\n";
        }

if ($this->query['limit']['limit']) {
            $limit = $this->query['limit'];
            $sql .= 'LIMIT ' . ($limit['offset'] ? $limit['offset'] . ', ' : '') . $limit['limit'];
        }

return $sql;
    }

/**
     * Converts object to string.
     *
     * @return string
     */
    public function __toString()
    {
        return $this->build();
    }

/**
     * Get query.
     *
     * @return array
     */
    public function getQuery(): array
    {
        return $this->query;
    }
}