UML sequence diagram exercise questions and my drawing

The questions are as follows:

The Administrator opens the Add User Interface, selects a group (in the drop-down list) on the interface, enters the basic user information, and submits the information to the system for saving.

The system saves user information and establishes association between users and groups.

 

My picture:

Note:

1. If you use powerdesigner 12.5 to draw images, I personally feel that some functions are not as convenient as staruml.

2. the L2 design is used, and the usermanager is directly saved to the DB, omitting userdal and groupdal.

3. create a user object in useraspx and set the basic attributes (name, age ...), however, if the group object is not queried, the logic of the query group is placed in usermanager. take into account transactions and data access.

4. The message indicating that usermanager is successfully saved to useraspx is omitted in Step 13.