init

vendor/yiisoft/yii2/test/DbFixture.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\test;
+
+use yii\base\BaseObject;
+use yii\db\Connection;
+use yii\di\Instance;
+
+/**
+ * DbFixture is the base class for DB-related fixtures.
+ *
+ * DbFixture provides the [[db]] connection to be used by DB fixtures.
+ *
+ * For more details and usage information on DbFixture, see the [guide article on fixtures](guide:test-fixtures).
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+abstract class DbFixture extends Fixture
+{
+    /**
+     * @var Connection|array|string the DB connection object or the application component ID of the DB connection.
+     * After the DbFixture object is created, if you want to change this property, you should only assign it
+     * with a DB connection object.
+     * Starting from version 2.0.2, this can also be a configuration array for creating the object.
+     */
+    public $db = 'db';
+
+
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        parent::init();
+        $this->db = Instance::ensure($this->db, BaseObject::className());
+    }
+}