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vendor/yiisoft/yii2/db/ViewFinderTrait.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;
+
+/**
+ * ViewFinderTrait implements the method getViewNames for finding views in a database.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Bob Olde Hampsink <b.oldehampsink@nerds.company>
+ * @since 2.0.12
+ */
+trait ViewFinderTrait
+{
+    /**
+     * @var array list of ALL view names in the database
+     */
+    private $_viewNames = [];
+
+    /**
+     * Returns all views names in the database.
+     * @param string $schema the schema of the views. Defaults to empty string, meaning the current or default schema.
+     * @return array all views names in the database. The names have NO schema name prefix.
+     */
+    abstract protected function findViewNames($schema = '');
+
+    /**
+     * Returns all view names in the database.
+     * @param string $schema the schema of the views. Defaults to empty string, meaning the current or default schema name.
+     * If not empty, the returned view names will be prefixed with the schema name.
+     * @param bool $refresh whether to fetch the latest available view names. If this is false,
+     * view names fetched previously (if available) will be returned.
+     * @return string[] all view names in the database.
+     */
+    public function getViewNames($schema = '', $refresh = false)
+    {
+        if (!isset($this->_viewNames[$schema]) || $refresh) {
+            $this->_viewNames[$schema] = $this->findViewNames($schema);
+        }
+
+        return $this->_viewNames[$schema];
+    }
+}