高级查询spring boot

Question

谁能解释我如何在Crudrepository中添加高级查询，例如，在我的情况下，我想按用户的firstname搜索用户。

以下是我的AppUsers类

public class AppUsers {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public int id;
    @Column(name = "firstname")
    public String firstName;
    @Column(name = "lastname")
    public String lastName;

    public AppUsers() {
    }

    public AppUsers(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

}

这是AppUsers信息库：

package com.developer.SpringMySQL.models;

import org.springframework.data.repository.CrudRepository;
import org.springframework.data.repository.PagingAndSortingRepository;


public interface AppUsersRepo extends PagingAndSortingRepository<AppUsers,Integer> {

}

这是控制器：

@Controller
public class MainController {

    private AppUsersRepo usersRepository;

    @Autowired
    AppUsersRepo appRepo;

    @RequestMapping("/")
    public ModelAndView doHome() {
        ModelAndView mv = new ModelAndView("index");
        mv.addObject("lists", appRepo.findAll());
        return mv;
    } 
}

Answer 1

它是存储库方法的命名约定。 在您的情况下，您需要在Repository接口中创建一个方法：

设置findByFirstName（String pFirstName）;

有关命名约定的更多信息，请参见以下链接：

https://spring.io/guides/gs/accessing-data-mysql/

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/

Answer 2

在Spring JPA中，您可以这样做：

Set<AppUsers> findByFirstName(String firstName);

或者在更复杂的情况下，您可以使用像这样的mysql（来自我的项目的示例）：

    @Query("SELECT NEW ps.exalt.timeoff.server.response.BasicInformation(e.id,e.name,e.email,e.profilePicture) FROM Employee e join e.roles r where r.id = 5 AND e.id > 0 AND activated= :enable")
Page<BasicInformation> findAllEmpWithApprovers(Pageable pageRequest,@Param("enable")boolean enable);

有关更多信息，请检查文档： http : //docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.query-methods.query-creation