Design and implementation of community parking space rental management system based on Java

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4.4 System E-R diagram design

E-R diagram, also known as Entity Relationship Diagram, provides a method to represent entity types, attributes and relationships, and is used to describe the real world's Conceptual model a>. [7]

It is an effective means to describe the conceptual model of real-world relationships and a way to represent the conceptual relationship model. This model often uses rectangular boxes to represent entity types, with entity names marked in the boxes; elliptical frames are used to represent entity attributes, and solid line segments are used to connect them with corresponding entity types; diamond boxes are used to represent the reasons for the connections between entity types. Mark the contact name in the box, connect it with the relevant entity type with a solid line segment, and indicate the contact type and type (such as 1:1, 1:n or m:n) next to the line segment. Examples of entity properties are as follows:

Administrator information entities include: number, user name, password and other attributes, as shown in Figure 4-3:

4.5 Database design

Profile table

List	type of data	Required	describe
id	bigint(20)	yes	primary key
name	varchar(100)	yes	Configuration parameter name
value	varchar(100)	no	Configuration parameter values

Parking space repair report form

List	type of data	Required	describe
id	bigint(20)	yes	primary key
addtime	timestamp	yes	creation time
chewibianhao	varchar(200)	no	Parking space number
cheweimingcheng	varchar(200)	no	Parking space name
cheweileixing	varchar(200)	no	Parking space type
Weizhi	varchar(200)	no	Location
baoxiuneirong	longtext	no	Repair content
baoxiushijian	datetime	no	Repair time
zhanghao	varchar(200)	no	account
xingming	varchar(200)	no	Name
sfsh	varchar(200)	no	Whether to review
shhf	longtext	no	moderation reply

Parking space return form

List	type of data	Required	describe
id	bigint(20)	yes	primary key
addtime	timestamp	yes	creation time
chewibianhao	varchar(200)	no	Parking space number
cheweimingcheng	varchar(200)	no	Parking space name
cheweileixing	varchar(200)	no	Parking space type
Weizhi	varchar(200)	no	Location
zulinleixing	varchar(200)	no	Lease type
tuizushijian	datetime	no	Check-out time
tuizubeizhu	varchar(200)	no	Notes on renting out
zhanghao	varchar(200)	no	account
xingming	varchar(200)	no	Name
loudongdanyuan	varchar(200)	no	Building unit
sfsh	varchar(200)	no	Whether to review
shhf	longtext	no	moderation reply

5 system implementation

5.1 Frontend module

5.1.1 Implementation of homepage function module

Function description: Users of this system can view the homepage information through this front-end WeChat system page, and can also perform corresponding operations based on this page and connect to other different addresses. Click to enter the system to enter this page. When the user opens the system, the first thing they see is the interface. Here, we can view the system navigation bar and topic introduction, etc. The system homepage login interface is shown in Figure 5-1:

5.2 Background module implementation

5.2.1 Implementation of the administrator module

The administrator uses the administrator account and password in the database system, selects the role and fills in the correct account and password to log in, as shown in Figure 5-2.

5.2.2 Implementation of parking space rental information module

The administrator can click on the parking space rental information interface. Enter the interface, as shown in Figure 5-3:

6.4 Test cases

6.4.1 User management test cases

Table 6-1 shows the user management use case table, which is used to test the user management function in the system. Through the user management use case table, the user management functions in the system can be comprehensively tested.

Table6-1 Usage management example table< /span>

test case	step	expected outcome	actual results
If the administrator wants to search for the user's information, he or she needs to enter part of the user's information in the search box to search for the user's information.	The user information entered in the user management interface does not match the database user table record.	Search failed	Search failed
If the administrator wants to add user information, he needs to click the Add button and enter the user's information.	The user information entered in the user management interface conflicts with the database user table record.	add failed	add failed
If the administrator wants to delete the user's information, he needs to click the delete button	Click the delete button in the user management interface, if the deleted user information is related to other tables	failed to delete	failed to delete
If the administrator wants to modify the user's information, he needs to click the modify button and enter the user's new information.	The user information entered in the user management interface conflicts with the database user table record.	fail to edit	fail to edit

6.4.2 Parking space rental management test case

The parking space rental management use case table can test the parking space rental management function in the system. The parking space rental management use case table is shown in Table 6-2.

Table6-2 Example table for car position tax management

test case	step	expected outcome	actual results
If the administrator wants to search for parking space rental information, he needs to enter part of the parking space rental information in the search box to search for parking space rental information.	The parking space rental information entered in the parking space rental management interface does not match the parking space rental table records in the database.	Search failed	Search failed
If the administrator wants to add parking space rental information, he needs to click the Add button and enter the parking space rental information.	The parking space rental information entered in the parking space rental management interface conflicts with the database parking space rental table records.	add failed	add failed
If the administrator wants to delete the parking space rental information, he needs to click the delete button	Click the delete button in the parking space rental management interface. If the deleted parking space rental information is related to other tables	failed to delete	failed to delete
If the administrator wants to modify the parking space rental information, he needs to click the modify button and enter the new parking space rental information.	The parking space rental information entered in the parking space rental management interface conflicts with the database parking space rental table records.	fail to edit	fail to edit

6.4.3 Rent statistical information management use cases

Table6.3 Tax accounting information management example Table

serial number	testing scenarios	enter	output	expected output
1	Enter the rental statistical information name contained in the database record in the input box in the rental statistical information management interface.	yong	Display the searched rental statistics information	Display the searched rental statistics information
2	Click the Add button in the rental statistics information management interface to add rental statistics information.	Basic information on rental statistics	If the rental statistics information entered conflicts with the database record, the addition fails	If the rental statistics information entered conflicts with the database record, the addition fails
3	Click the Delete button in the rental statistics information management interface to delete the rental statistics information.	none	If the deleted rent statistics record does not have a foreign key relationship with records in other tables, it can be deleted successfully.	If the deleted rent statistics record does not have a foreign key relationship with records in other tables, it can be deleted successfully.
4	Click the Modify button in the rental statistics information management interface to modify the rental statistics information.	Modify basic information about rental statistics	If the rent statistics entered to be modified conflict with the database rent statistics table records, the modification cannot be successful.	If the rent statistics entered to be modified conflict with the database rent statistics table records, the modification cannot be successful.