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Java 如何在Spring中将OrderBy与findAll一起使用_Java_Spring_Spring Boot - Fatal编程技术网

Java 如何在Spring中将OrderBy与findAll一起使用

Java 如何在Spring中将OrderBy与findAll一起使用,java,spring,spring-boot,Java,Spring,Spring Boot,我正在使用Spring数据,希望从数据库中获取按id排序的数据。当我编写findAllByOrderById时,出现了错误。我想错误代码是“找不到类型Employee的属性id!” 但我不知道去哪里修理。 存储库 @Repository public interface EmployeeRepository extends JpaRepository<Employee, Long> { public List<Employee> findAllByOrderByI

我正在使用Spring数据,希望从数据库中获取按id排序的数据。当我编写findAllByOrderById时,出现了错误。我想错误代码是“找不到类型Employee的属性id!” 但我不知道去哪里修理。 存储库

@Repository
public interface EmployeeRepository extends JpaRepository<Employee, Long> {
    public List<Employee> findAllByOrderById();

}
控制器

@Controller
public class DemoController {
    @Autowired
    EmployeeRepository empRepository;

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index(Model model) {
        List<Employee> emplist = empRepository.getAllEmployeesOrderById();

        model.addAttribute("emplist", emplist);
        return "view/index";
    }
}

您应该为该方法使用的命名可能是:

findAllByOrderByEmp_IdAsc()

根据你的需要

用于查询创建方法命名的完整文档

Java中也推荐使用camelCase作为字段命名


因此,例如,如果您的字段将命名为
empId
,那么您的方法将命名为
findAllByOrderByEmpIdAsc()

对不起,我可以获取数据,但数据没有排序。这是另一个问题吗?是的,您可能必须在末尾添加“Asc”或“Desc”
<body>
    <div id="wrapper">
        <div id="header">
            <h1>日報管理システム</h1>
        </div>
        <div id="parent" th:include="app"></div>
    </div>
    <h1 th:text="${title}"></h1>
    <table>
        <tr th:each="emp : ${emplist}" th:object="${emp}">
            <td th:text="*{emp_id}"></td>
            <td th:text="*{emp_name}"></td>
        </tr>
    </table>

    <br>
</body>
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeRepository': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List spring.repositries.EmployeeRepository.findAllByOrderById()! No property id found for type Employee!

Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List spring.repositries.EmployeeRepository.findAllByOrderById()! No property id found for type Employee!

Caused by: org.springframework.data.mapping.PropertyReferenceException: No property id found for type Employee!

findAllByOrderByEmp_IdAsc()
findAllByOrderByEmp_IdDesc()