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vendor/yiisoft/yii2/db/mssql/SqlsrvPDO.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\mssql;
+
+/**
+ * This is an extension of the default PDO class of SQLSRV driver.
+ * It provides workarounds for improperly implemented functionalities of the SQLSRV driver.
+ *
+ * @author Timur Ruziev <resurtm@gmail.com>
+ * @since 2.0
+ */
+class SqlsrvPDO extends \PDO
+{
+    /**
+     * Returns value of the last inserted ID.
+     *
+     * SQLSRV driver implements [[PDO::lastInsertId()]] method but with a single peculiarity:
+     * when `$sequence` value is a null or an empty string it returns an empty string.
+     * But when parameter is not specified it works as expected and returns actual
+     * last inserted ID (like the other PDO drivers).
+     * @param string|null $sequence the sequence name. Defaults to null.
+     * @return int last inserted ID value.
+     */
+    public function lastInsertId($sequence = null)
+    {
+        return !$sequence ? parent::lastInsertId() : parent::lastInsertId($sequence);
+    }
+}