我在Mysql数据库中有两个表:Department和Contact。我在apllication.properties文件中连接了我的应用程序。
这是我的数据库:
pom.xml如下:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo1</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
这是我的联系班:
@Entity
@Table(name="contact")
public class Contact {
@Id
@Column(name="contact_id")
private int Contact_id;
@Column(name="emp_name")
private String Emp_name;
@Column(name="mobile")
private String Mobile;
@Column(name="landline_office")
private String Landline_office;
@Column(name="landline_res")
private String Landline_res;
@Column(name="fax")
private String Fax;
@Column(name="email")
private String Email;
@ManyToOne(cascade= {CascadeType.PERSIST,CascadeType.MERGE,
CascadeType.DETACH,CascadeType.REFRESH})
@JoinColumn(name="department_dept_id")
private Department department;
... constructors and getters and setters
这是我的系类:
@Entity
@Table(name="department")
public class Department {
@Id
@Column(name="dept_id")
private int Dept_id;
@Column(name="dept_name")
private String Dept_name;
@Column(name="order")
private String Order;
@Column(name="home")
private int Home;
@OneToMany(mappedBy="department",
cascade= {CascadeType.PERSIST,CascadeType.MERGE,
CascadeType.DETACH,CascadeType.REFRESH})
private List<Contact> contacts;
public Department() {
}
...getters and setters and constructors
我可以显示第一个实体:使用百日咳的表中的部门:
我想要做的是:当我单击第1行中的“查看”按钮时,动态显示属于ICT的所有员工,对于PWD也是如此。
我已经在github上传了这个项目:https://github.com/sammizodev/Jpa_two_tables
以下是您发布的代码的代码审查:
命名约定:你应该看一下java naming conventions,类属性应该遵循camel case语法,使用下划线是无视的。
上面不需要影响您的数据库模式,因为您可以使用@Column
来执行表字段和类属性之间的映射,例如:
@Id
@Column(name="dept_id")
private int id;
@Column(name="dept_name")
private String name;
@Column(name="dept_order")
private String Order;
请注意,order是许多数据库中的关键字,因此您可能需要更改它。
宁静的约定:我建议你看看restful API design,然后你就可以了解如何构建你的应用程序以访问某些资源。
根据约定,您有一个资源(部门),您将需要这些URI:
例如,您有GET /departments_list
来渲染您的部门列表,您需要将其更改为GET /departments
,并且您的模板应命名为list.html。
@GetMapping("/departments")
public String listDepartments(Model model) {
List<Department> departments = departmentService.findAll();
model.addAttribute("departments",departments);
return "/departments/list"; // Your current thymeleaf template
}
然后你需要一个GET /departments/{id}
来呈现部门的详细信息,包括联系人列表。
因此,在您的部门列表模板上,您应该构建如下链接:
<a th:href="@{/home/contact/{departmentId}(departmentId=${tempDepartment.dept_id})}"
class="btn btn-info btn-sm">View</a>
请注意,您需要提供像/home/contact/{departmentId}
这样的网址,以便thymeleaf可以替换id属性,否则您将收到参数。
在您的控制器上,您需要更新到联系人的映射以包含id作为路径变量:
@GetMapping("/departments/{id}")
public String listContacts(@PathVariable("id") int theId, Model theModel) {
Department department = departmentService.findById(theId);
theModel.addAttribute("department",department);
return "/departments/show";
}
如果您的Department类加载了热切的联系人,您可以在show.html
模板中访问前端的列表。
<tr th:each="contact : ${department.contacts}">
<td th:text="${contact.contact_id}" />
<td th:text="${contact.emp_name}" />
<td th:text="${contact.mobile}" />
<td th:text="${contact.landline_office}" />
</tr>
另外,记得将ContactService
连接到你的DemoController
。
public DemoController(DepartmentService departmentService, ContactService contactService) {
this.departmentService = departmentService;
this.contactService = contactService;
}