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spring-boot - 我想通过电子邮件、年份和学期（学期）从数据库中检索数据

问题描述

我想检索当前用户在出勤表中通过他的电子邮件搜索的出勤情况。接下来，我必须确切地知道我想要检索哪一年和哪一学期的出勤率，所以我尝试通过在控制器中输入“日期”作为参数来执行此操作，但它没有帮助。它给了我下一个

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'attendanceRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.example.demo.Repositories.AttendanceRepository.findAttendanceByEmail(java.lang.String,java.lang.String)! At least 2 parameter(s) provided but only 1 parameter(s) present in query.
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1290) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
    ... 32 common frames omitted

我也试过没有参数，有我的代码：

考勤控制器.java

@Autowired
    AttendanceService attendanceService;

    // Get User Attendance
    @RequestMapping(value = "/attendance", method = RequestMethod.GET)
    public List<Attendance> getUserAttendance(@AuthenticationPrincipal MyUserDetails myUserDetails, java.util.Date date) {
        return attendanceService.getUserAttendanceByEmail(myUserDetails.getEmail(), date);
    }

出勤存储库.java

public interface AttendanceRepository extends JpaRepository<Attendance, Integer> {
    List<Attendance> findAttendanceByEmail(String email, String year_and_term);
}

出勤服务.java

@Autowired
    AttendanceRepository attendanceRepository;

    // Finds in attendance table by email of the current user
    public List<Attendance> getUserAttendanceByEmail(String email, Date date) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(date);

        int year = cal.get(Calendar.YEAR);
        int term = cal.get(Calendar.MONTH);

        if (term >= 1 && term <= 5)
            term = 1;
        else if (term >= 9 && term <= 12)
            term = 2;

        String year_and_term = year + "-" + (year+1) + " (" + term + ")";
        System.out.println(year_and_term);
        return attendanceRepository.findAttendanceByEmail(email, year_and_term);
    }

出勤实体.java

@Entity
@Table(name = "attendance")
public class Attendance {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    @ManyToOne
    @JoinColumn(name="subject_id", nullable=false)
    private Subjects subjects;
    private String email;
    private Integer absent;
    private Integer attend;
    private Integer permitted;
    private String year_and_term;

    public Attendance(Integer id, Subjects subjects, String email, Integer absent, Integer attend, Integer permitted, String year_and_term) {
        this.id = id;
        this.subjects = subjects;
        this.email = email;
        this.absent = absent;
        this.attend = attend;
        this.permitted = permitted;
        this.year_and_term = year_and_term;
    }

    public Attendance() {
    }
    // getters and setters..

db中有我的表出勤：

+----+------------+--------+--------+--------+-----------+---------------+
| id | subject_id | email  | absent | attend | permitted | year_and_term |
+----+------------+--------+--------+--------+-----------+---------------+
|  1 |          1 | damir  |      1 |      1 |         1 | 2019-2020 (2) |
|  2 |          2 | damir  |      0 |      5 |         2 | 2019-2020 (2) |
|  3 |          3 | rapkat |      0 |     10 |         0 | 2019-2020 (2) |
|  4 |          1 | damir  |     10 |     20 |         5 | 2019-2020 (1) |
|  5 |          2 | damir  |      2 |     20 |         0 | 2019-2020 (1) |
+----+------------+--------+--------+--------+-----------+---------------+

标签： spring-bootspring-data-jpa

解决方案

实际上，您在这里有两个问题，第一个是您使用 spring jpa 关键字创建了变量名称，即变量名称 year_and_term 中的“和”，并且您将两个不同的值相互组合在一起，将来您可能需要同时查询两者year 和 sem 分开，那么你会遇到麻烦。

所以现在你有两个解决方案： -

  1. 如果您仍然想使用clubbed，请重构变量名称以喜欢 yearNterm 即只需将 and 替换为 N 或您想要的东西。那么您的查询将类似于：-

    List findByEmailAndYearNterm(String email, String year_and_term);

  2. 或者您可以按照我的方法进行，即将 2 它与 2 个变量分开，例如 1 是年份，2 是术语，那么您的查询将如下所示：-

    List findByEmailAndYearAndTerm(String email, String year, String term);

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