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vendor/yiisoft/yii2/db/Constraint.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db;
+
+use yii\base\BaseObject;
+
+/**
+ * Constraint represents the metadata of a table constraint.
+ *
+ * @author Sergey Makinen <sergey@makinen.ru>
+ * @since 2.0.13
+ */
+class Constraint extends BaseObject
+{
+    /**
+     * @var string[]|null list of column names the constraint belongs to.
+     */
+    public $columnNames;
+    /**
+     * @var string|null the constraint name.
+     */
+    public $name;
+}