ExistsRule.php
2.17 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
<?php
/**
* Joomla! Content Management System
*
* @copyright Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Form\Rule;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;
/**
* Form rule class to determine if a value exists in a database table.
*
* @since 3.9.0
*/
class ExistsRule extends FormRule
{
/**
* Method to test the username for uniqueness.
*
* @param \SimpleXMLElement $element The SimpleXMLElement object representing the `<field>` tag for the form field object.
* @param mixed $value The form field value to validate.
* @param string $group The field name group control value. This acts as an array container for the field.
* For example if the field has name="foo" and the group value is set to "bar" then the
* full field name would end up being "bar[foo]".
* @param Registry $input An optional Registry object with the entire data set to validate against the entire form.
* @param Form $form The form object for which the field is being tested.
*
* @return boolean True if the value is valid, false otherwise.
*
* @since 3.9.0
*/
public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
{
$value = trim($value);
$existsTable = (string) $element['exists_table'];
$existsColumn = (string) $element['exists_column'];
// We cannot validate without a table name
if ($existsTable === '')
{
return true;
}
// Assume a default column name of `id`
if ($existsColumn === '')
{
$existsColumn = 'id';
}
$db = Factory::getDbo();
// Set and query the database.
$exists = $db->setQuery(
$db->getQuery(true)
->select('COUNT(*)')
->from($db->quoteName($existsTable))
->where($db->quoteName($existsColumn) . ' = ' . $db->quote($value))
)->loadResult();
return (int) $exists > 0;
}
}