diff --git a/db.py b/db.py
new file mode 100644
index 0000000..b4cb0ec
--- /dev/null
+++ b/db.py
@@ -0,0 +1,53 @@
+import json
+
+class MysqlDatabases:
+    def __init__(self):
+        self.users = json.loads(open('users.json',mode='r',encoding='utf-8').read())
+        self.cake = json.loads(open('cake.json', mode='r', encoding='utf-8').read())
+
+    def check_login(self,username,password):
+        for user in self.users:
+            if username == user['username']:
+                if password == user['password']:
+                    return True,'登录成功'
+        return False,'登录失败，密码不存在'
+
+    def check_register(self,username):
+        for user in self.users:
+            if username == user['username']:
+                return False, '注册失败，用户已存在'
+        return True, '注册成功'
+
+
+    def all(self):
+        return self.cake
+
+    def insert(self,student):
+        self.cake.append(student)
+
+    def delete_by_username(self,name):
+        for student in self.cake:
+            print(student)
+            if student['name'] == name:
+                self.cake.remove(student)
+                return True,f'{name}删除成功'
+        return False,f'{name}不存在'
+    def search_by_username(self,name):
+        for student in self.cake:
+            if student['name'] == name:
+                return True,student
+        return False,f'{name}不存在'
+
+    def update(self,stu):
+        for student in self.cake:
+            if student['name'] == stu['name']:
+                student.update(stu)
+                return True,f''
+        return False,f'{stu["name"]}不存在'
+
+
+db = MysqlDatabases()
+
+if __name__ =='__main__':
+    print(db.check_login('admin','123456'))
+    print(db.all())