admin/model/sale/voucher_theme.php

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<?php
class ModelSaleVoucherTheme extends Model {
	public function addVoucherTheme($data) {
		$this->db->query("INSERT INTO " . DB_PREFIX . "voucher_theme SET image = '" . $this->db->escape((string)$data['image']) . "'");

		$voucher_theme_id = $this->db->getLastId();

		foreach ($data['voucher_theme_description'] as $language_id => $value) {
			$this->db->query("INSERT INTO " . DB_PREFIX . "voucher_theme_description SET voucher_theme_id = '" . (int)$voucher_theme_id . "', language_id = '" . (int)$language_id . "', name = '" . $this->db->escape($value['name']) . "'");
		}

		$this->cache->delete('voucher_theme');
		
		return $voucher_theme_id;
	}

	public function editVoucherTheme($voucher_theme_id, $data) {
		$this->db->query("UPDATE " . DB_PREFIX . "voucher_theme SET image = '" . $this->db->escape((string)$data['image']) . "' WHERE voucher_theme_id = '" . (int)$voucher_theme_id . "'");

		$this->db->query("DELETE FROM " . DB_PREFIX . "voucher_theme_description WHERE voucher_theme_id = '" . (int)$voucher_theme_id . "'");

		foreach ($data['voucher_theme_description'] as $language_id => $value) {
			$this->db->query("INSERT INTO " . DB_PREFIX . "voucher_theme_description SET voucher_theme_id = '" . (int)$voucher_theme_id . "', language_id = '" . (int)$language_id . "', name = '" . $this->db->escape($value['name']) . "'");
		}

		$this->cache->delete('voucher_theme');
	}

	public function deleteVoucherTheme($voucher_theme_id) {
		$this->db->query("DELETE FROM " . DB_PREFIX . "voucher_theme WHERE voucher_theme_id = '" . (int)$voucher_theme_id . "'");
		$this->db->query("DELETE FROM " . DB_PREFIX . "voucher_theme_description WHERE voucher_theme_id = '" . (int)$voucher_theme_id . "'");

		$this->cache->delete('voucher_theme');
	}

	public function getVoucherTheme($voucher_theme_id) {
		$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "voucher_theme vt LEFT JOIN " . DB_PREFIX . "voucher_theme_description vtd ON (vt.voucher_theme_id = vtd.voucher_theme_id) WHERE vt.voucher_theme_id = '" . (int)$voucher_theme_id . "' AND vtd.language_id = '" . (int)$this->config->get('config_language_id') . "'");

		return $query->row;
	}

	public function getVoucherThemes($data = array()) {
		if ($data) {
			$sql = "SELECT * FROM " . DB_PREFIX . "voucher_theme vt LEFT JOIN " . DB_PREFIX . "voucher_theme_description vtd ON (vt.voucher_theme_id = vtd.voucher_theme_id) WHERE vtd.language_id = '" . (int)$this->config->get('config_language_id') . "' ORDER BY vtd.name";

			if (isset($data['order']) && ($data['order'] == 'DESC')) {
				$sql .= " DESC";
			} else {
				$sql .= " ASC";
			}

			if (isset($data['start']) || isset($data['limit'])) {
				if ($data['start'] < 0) {
					$data['start'] = 0;
				}

				if ($data['limit'] < 1) {
					$data['limit'] = 20;
				}