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vendor/yiisoft/yii2/db/ForeignKeyConstraint.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;
+
+/**
+ * ForeignKeyConstraint represents the metadata of a table `FOREIGN KEY` constraint.
+ *
+ * @author Sergey Makinen <sergey@makinen.ru>
+ * @since 2.0.13
+ */
+class ForeignKeyConstraint extends Constraint
+{
+    /**
+     * @var string|null referenced table schema name.
+     */
+    public $foreignSchemaName;
+    /**
+     * @var string referenced table name.
+     */
+    public $foreignTableName;
+    /**
+     * @var string[] list of referenced table column names.
+     */
+    public $foreignColumnNames;
+    /**
+     * @var string|null referential action if rows in a referenced table are to be updated.
+     */
+    public $onUpdate;
+    /**
+     * @var string|null referential action if rows in a referenced table are to be deleted.
+     */
+    public $onDelete;
+}