Java 向Spring数据存储库添加自定义功能的问题
我通过Java 向Spring数据存储库添加自定义功能的问题,java,spring-boot,spring-data,Java,Spring Boot,Spring Data,我通过crudepository的内置方法获取数据，但在将自定义方法应用于数据存储库时出错 这是存储库 @Repository public interface EmployeeRepository extends CrudRepository<Employee, Integer> { List<Employee> findAllByEmployeeLastName(String last); } 堆栈跟踪： [I:\spring\u boot\u projec
crudepository@Repository
public interface EmployeeRepository extends CrudRepository<Employee, Integer> {
List<Employee> findAllByEmployeeLastName(String last);
}
：应用程序运行失败 org.springframework.beans.factory.unsatifiedDependencyException： 创建文件中定义了名为“employeeRestController”的bean时出错
日志中指出： 无法为方法public abstract java.util.List创建查询 com.project.repository.EmployeeRepository.findByEmployeeLastName（java.lang.String）！ 找不到类型Employee的属性employeeLastName
EmployeeRepositoryfindAllByLast（最后一个字符串）
另外，我建议您阅读java编码和命名约定，以避免此类错误。在数据存储库中创建自定义方法时，您的方法命名约定是强制性的，取决于您的DAO类字段
在姓氏的DAO类中，您已经创建了last
变量，因此您的方法名不能是findAllByLastName（字符串last），因为DAO类中没有任何名为lastName的变量
所以应该是findAllByLast（最后一个字符串）或findByLast（最后一个字符串）
显示您的员工实体和stacktrace of Exception已通过编辑先生添加。非常感谢您的帮助，我们一定会遵循您的建议。我建议您更好地了解spring数据
@Service
public class EmployeeService {
private EmployeeRepository employeeRepository;
@Autowired
public EmployeeService(EmployeeRepository _employeeRepository) {
employeeRepository = _employeeRepository;
}
public Iterable<Employee> findAll() {
return employeeRepository.findAll();
}
public Employee findById(int id) {
Optional<Employee> id_of_employee = employeeRepository.findById(id);
Employee employee = null;
if (id_of_employee.isPresent()) {
employee = id_of_employee.get();
} else {
throw new RuntimeException("ID not found : " + id);
}
return employee;
}
public List<Employee> getEmployeeByLastName(String last) {
return employeeRepository.findAllByEmployeeLastName(last);
}
}
@RestController
@RequestMapping("/api") public class EmployeeRestController {
public EmployeeService employeeService;
@Autowired
public EmployeeRestController(EmployeeService _employeeService) {
employeeService = _employeeService;
}
@GetMapping("/list_of_employees")
public Iterable<Employee> getAllEmployees() {
return employeeService.findAll();
}
@GetMapping("/find_an_employee_by_id/{id}")
public Employee getAnEmplopyeeByID(@PathVariable int id) {
Employee employee = employeeService.findById(id);
if (employee == null) {
throw new RuntimeException("ID not found : " + id);
}
return employee;
}
@RequestMapping("/find_employee_by_last_name/{last}")
public List<Employee> getEmployeeByLastName(@PathVariable(value = "last") String last) {
return employeeService.getEmployeeByLastName(last);
}
}
@Entity
@Table(name = "employees")
public class Employee {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
@Column(name = "first_name")
private String first_name;
@Column(name = "last")
private String last;
@Column(name = "salary")
private double salary;
@Column(name = "email")
private String email;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirst_name() {
return first_name;
}
public void setFirst_name(String first_name) {
this.first_name = first_name;
}
public String getLast() {
return last;
}
public void setLast(String last) {
this.last= last;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Employee() {
}
}