Initial establishment of the database
After several editions of improvements, the database has been initially established. The following is a brief description:
demand analysis
The administrator creates a conference. In this conference, you can set multiple roles, such as moderator, participant type one, type two, etc., and then make different roles correspond to different files. In this meeting, a tablet corresponds to a role.
Administrators can create polls, and one tablet can cast one or more options in one poll.
This design uses the mechanism of separation of roles and devices to control permissions. Meeting-related documents are not directly associated with the device, which improves the flexibility of the system. The administrator can designate any device as the host or adjust the role at will Permissions, through the management of roles and equipment to achieve batch adjustment of permissions.
Data Dictionary
Entity set
1.meeting table
| name | Types of | Description |
|---|---|---|
| uid | int | Meeting number |
| name | varchar | meeting name |
| content | varchar | Content of meeting |
| begin_time | time | Meeting start time |
| end_time | time | Meeting end time |
The meeting table contains the basic content of the meeting, the main key is the meeting number
2.device table
| name | Types of | Description |
|---|---|---|
| uid | int | device ID |
| mac | varchar | MAC address |
| name | varchar | Equipment name |
The device table contains the basic information of the device, and the primary key is the device number
3. Role table
| name | Types of | Description |
|---|---|---|
| uid | int | Role number |
| name | varchar | Role Name |
The role table contains the basic information of the role, the primary key is the role number
4.file table
| name | Types of | Description |
|---|---|---|
| uid | int | File Number |
| name | varchar | file name |
| address | varchar | address |
The file table contains the basic information of the file, the primary key is the file number
5.choice table
| name | Types of | Description |
|---|---|---|
| uid | int | Option number |
| content | varchar | Option content |
| belongs | int | Which vote belongs to |
The option table contains the basic information of the option, the primary key is the option number
6.vote table
| name | Types of | Description |
|---|---|---|
| uid | int | Voting number |
| name | varchar | Voting name |
| content | varchar | Voting content |
| anonymous | int | Is anonymous |
| type | int | Voting type |
| meeting_id | int | Owning Conference Number |
The voting table contains the basic information of the voting, and the primary key is the voting number
Relation set
1.device_role
| name | Types of | Description |
|---|---|---|
| role_id | int | |
| device_id | int | |
| meeting_id | int |
2.meeting_role
| name | Types of | Description |
|---|---|---|
| meeting_id | int | |
| role_id | int | |
| file_id | int |
3.device_choice
| name | Types of | Description |
|---|---|---|
| device_id | int | |
| choice_id | int |