使用CrudRepository (Spring Data和thymeleaf)实现ManyToOne关系的步骤如下:
@Entity
public class Department {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
@OneToMany(mappedBy = "department")
private List<Employee> employees;
// 省略其他属性和方法
}
@Entity
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
@ManyToOne
@JoinColumn(name = "department_id")
private Department department;
// 省略其他属性和方法
}
public interface EmployeeRepository extends CrudRepository<Employee, Long> {
}
@Controller
public class EmployeeController {
@Autowired
private EmployeeRepository employeeRepository;
@GetMapping("/employees")
public String getEmployees(Model model) {
List<Employee> employees = (List<Employee>) employeeRepository.findAll();
model.addAttribute("employees", employees);
return "employees";
}
}
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Employees</title>
</head>
<body>
<h1>Employees</h1>
<table>
<tr>
<th>ID</th>
<th>Name</th>
<th>Department</th>
</tr>
<tr th:each="employee : ${employees}">
<td th:text="${employee.id}"></td>
<td th:text="${employee.name}"></td>
<td th:text="${employee.department.name}"></td>
</tr>
</table>
</body>
</html>
通过以上步骤,你可以使用CrudRepository (Spring Data和Thymeleaf)来实现ManyToOne关系。在这个例子中,我们展示了部门和员工之间的关系,通过Thymeleaf模板引擎将员工列表展示在页面上。你可以根据自己的需求进行扩展和修改。
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