diff --git a/migrations/init.sql b/migrations/init.sql
new file mode 100644
index 0000000..23dc901
--- /dev/null
+++ b/migrations/init.sql
@@ -0,0 +1,25 @@
+/*创建新用户*/
+CREATE USER jun@localhost IDENTIFIED BY 'jun';
+
+/*用户授权 授权jun用户拥有sf数据库的所有权限*/
+GRANT ALL PRIVILEGES ON sf.* TO jun@'%' IDENTIFIED BY 'jun';
+
+/*刷新授权*/
+FLUSH PRIVILEGES;
+
+/*创建数据库*/
+CREATE DATABASE IF NOT EXISTS `sf`;
+
+/*选择数据库*/
+USE `sf`;
+
+/*创建表*/
+CREATE TABLE IF NOT EXISTS `user` (
+    id INT(20) NOT NULL AUTO_INCREMENT,
+    name VARCHAR(50),
+    age INT(11),
+    PRIMARY KEY(id)
+);
+
+/*插入测试数据*/
+INSERT INTO `user` (name, age) VALUES('harry', 20), ('tony', 23), ('tom', 24);
\ No newline at end of file
diff --git a/src/db/Model.php b/src/db/Model.php
index 30661d8..695b434 100644
--- a/src/db/Model.php
+++ b/src/db/Model.php
@@ -25,7 +25,11 @@ public static function getDb()
             $database = 'sf';
             $username = 'jun';
             $password = 'jun';
-            static::$pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);
+            $options = [
+                PDO::ATTR_EMULATE_PREPARES => false,
+                PDO::ATTR_STRINGIFY_FETCHES => false
+            ];
+            static::$pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password, $options);
             static::$pdo->exec("set names 'utf8'");
         }
 
@@ -61,15 +65,21 @@ public static function primaryKey()
      * @param mixed $condition a set of column values
      * @return static|null Model instance matching the condition, or null if nothing matches.
      */
-    public static function findOne($condition)
+    public static function findOne($condition = null)
     {
-        $sql = 'select * from ' . static::tableName() . ' where ';
-        $params = array_values($condition);
-        $keys = [];
-        foreach ($condition as $key => $value) {
-            array_push($keys, "$key = ?");
+        $sql = 'select * from ' . static::tableName();
+        $params = [];
+
+        if (!empty($condition)) {
+            $sql .= ' where ';
+            $params = array_values($condition);
+            $keys = [];
+            foreach ($condition as $key => $value) {
+                array_push($keys, "$key = ?");
+            }
+            $sql .= implode(' and ', $keys);
         }
-        $sql .= implode(' and ', $keys);
+
         $stmt = static::getDb()->prepare($sql);
         $rs = $stmt->execute($params);