Question

基本上我在使用JavaFX以及Spring和Hibernate创建GUI。问题主要与JPA

有关

假设第一次用户在数据库中插入数据（列星期一 TRUE ，其他列 FALSE ）

ID   EMPLOYEES  START_TIME  END_TIME  MONDAY    TUESDAY     WEDNESSDAY      THURSDAY    FRIDAY   SATURDAY  SUNDAY
 1      5          1.0        7.0     TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
 2      7          9.0        11.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE

我的问题是第二次将数据插入db时，它会复制前两行，这不是我想要的。

ID   EMPLOYEES  START_TIME  END_TIME  MONDAY    TUESDAY     WEDNESSDAY      THURSDAY    FRIDAY   SATURDAY  SUNDAY
1       5          1.0        7.0     TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
2       7          9.0        11.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
3       5          1.0        7.0     TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
4       7          9.0        11.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
5       9          13.0       18.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE

我想要的是这样的：

ID   EMPLOYEES  START_TIME  END_TIME  MONDAY    TUESDAY     WEDNESSDAY      THURSDAY    FRIDAY   SATURDAY  SUNDAY
1       5          1.0        7.0     TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
2       7          9.0        11.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE         
3       9          13.0       18.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE

或者其他解决方案可以删除星期一列 TRUE 的所有行，并像以前一样重新创建，但自动生成的ID将是新的：

ID   EMPLOYEES  START_TIME  END_TIME  MONDAY    TUESDAY     WEDNESSDAY      THURSDAY    FRIDAY   SATURDAY  SUNDAY
3       5          1.0        7.0     TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE
4       7          9.0        11.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE         
5       9          13.0       18.0    TRUE      FALSE       FALSE            FALSE      FALSE     FALSE     FALSE

这是我的DAO课程：

@Repository
public class HistogramDAO {
 @PersistenceContext
 private EntityManager entityManager;


 public void create(Histogram histogram) {
 entityManager.persist(histogram);
 }


 public void update(Histogram histogram) {
 entityManager.merge(histogram);
 }


 public Histogram getBesoinRequestById(long id) {
 return entityManager.find(Histogram.class, id);
 }

 public void delete(long id) {
 Histogram histogram = getBesoinRequestById(id);
 if (histogram != null) {
 entityManager.remove(histogram);
 }
 }

 public List<Long> getBesoinRequestByMonday() {

     Query query = entityManager.createQuery("SELECT h.id FROM Histogram h WHERE h.monday = true AND h.tuesday = false AND h.wednessday = false AND h.thursday = false AND h.friday = false AND h.saturday = false AND h.sunday= false");

     return query.getResultList();
}

 public void updateBesoinRequestByMonday(long id) {

     Histogram histogram = getBesoinRequestById(id);
     if (histogram != null) {
         entityManager.merge(histogram);
         }
}
}

这是我的服务类：

@Component
@Transactional
public class HistogramService {

@Autowired
 private HistogramDAO histogramDAO;

 public void create(Histogram histogram) {
     histogramDAO.create(histogram);
 }

 public void update(Histogram histogram) {
     histogramDAO.update(histogram);
     }

 public void delete(long id) {
     histogramDAO.delete(id);
 }

 public List<Long> getBesoinRequestByMonday() {
     return histogramDAO.getBesoinRequestByMonday();
 }

 public void updateBesoinRequestByMonday(long id) {
     histogramDAO.updateBesoinRequestByMonday(id);
     }
}

这就是我在按钮点击时使用它的方式（正如您在评论代码中看到的那样，我尝试了不同的技巧，但它们都没有工作）：

Iterator it = seriesContainer.iterator();
                int j = 1;
                while(it.hasNext()){
                    XYChart.Series<Number, Number> test = (Series<Number, Number>) it.next();
                    System.out.println(test.getData().size());
                    for(int i=0; i<test.getData().size(); i++){
                        maxArray.add(test.getData().get(i).getXValue().doubleValue());
                        }
                    double max = maxArray.stream().collect(Collectors.summarizingDouble(Double::doubleValue)).getMax();

                    Histogram histogram = new Histogram(test.getData().get(0).getYValue().intValue(),
                            test.getData().get(0).getXValue().doubleValue(),max,cbMonday.isSelected(),
                            cbTuesday.isSelected(),cbWednessday.isSelected(),cbThursday.isSelected(),cbFriday.isSelected(),
                            cbSaturday.isSelected(),cbSunday.isSelected());

histogramService.create(histogram); // Here I'm using JPA to store in db

//                  List<Long> ids = histogramService.getBesoinRequestByMonday();

//                  if(ids.isEmpty()){
//                  for(long entry : ids) {
//                      if(histogramService.getBesoinRequestByMonday().contains(entry)){
//                          histogramService.updateBesoinRequestByMonday(entry);
                            //histogramService.create(histogram);
//                      }
//                  }
//                  }


//                  if(histogramService.getBesoinRequestByMonday().isEmpty()){
//                      histogramService.create(histogram);
//                  } else{
//                      histogramService.create(histogram);
//                      List<Long> ids = histogramService.getBesoinRequestByMonday();
//                      for(long entry : ids) {
//                          histogramService.updateBesoinRequestByMonday(entry);
//                          histogramService.getBesoinRequestByMonday().clear();
//                      }
//                  }

                    maxArray.clear();
                    j++;

更新：直方图实体：

import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

import org.springframework.stereotype.Component;


@Entity
@Table(name = "HISTOGRAM")
public class Histogram implements Serializable {

    private long id;
    private int employees;
    private double startTime; 
    private double endTime;

    private boolean monday;
    private boolean tuesday;
    private boolean wednessday;
    private boolean thursday;
    private boolean friday;
    private boolean saturday;
    private boolean sunday;

    public Histogram() {
    }

    public Histogram(int employees, double startTime, double endTime, boolean monday, boolean tuesday,
            boolean wednessday, boolean thursday, boolean friday, boolean saturday, boolean sunday) {
        this.employees = employees;
        this.startTime = startTime;
        this.endTime = endTime;
        this.monday = monday;
        this.tuesday = tuesday;
        this.wednessday = wednessday;
        this.thursday = thursday;
        this.friday = friday;
        this.saturday = saturday;
        this.sunday = sunday;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public long getId() {
        return id;
    }


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

    //@Size(min = 2, max = 255, message = "Enter between 2 and 255 characters!")
    @Column(name = "employees")
    @NotNull
    public int getEmployees() {
        return employees;
    }

    public void setEmployees(int employees) {
        this.employees = employees;
    }

    @Column(name = "startTime")
    @NotNull
    public double getStartTime() {
        return startTime;
    }

    public void setStartTime(double startTime) {
        this.startTime = startTime;
    }

    @Column(name = "endTime")
    @NotNull
    public double getEndTime() {
        return endTime;
    }

    public void setEndTime(double endTime) {
        this.endTime = endTime;
    }

    @Column(name = "monday")
    @NotNull
    public boolean isMonday() {
        return monday;
    }

    public void setMonday(boolean monday) {
        this.monday = monday;
    }

    @Column(name = "tuesday")
    @NotNull
    public boolean isTuesday() {
        return tuesday;
    }

    public void setTuesday(boolean tuesday) {
        this.tuesday = tuesday;
    }

    @Column(name = "wednessday")
    @NotNull
    public boolean isWednessday() {
        return wednessday;
    }

    public void setWednessday(boolean wednessday) {
        this.wednessday = wednessday;
    }

    @Column(name = "thursday")
    @NotNull
    public boolean isThursday() {
        return thursday;
    }

    public void setThursday(boolean thursday) {
        this.thursday = thursday;
    }

    @Column(name = "friday")
    @NotNull
    public boolean isFriday() {
        return friday;
    }

    public void setFriday(boolean friday) {
        this.friday = friday;
    }

    @Column(name = "saturday")
    @NotNull
    public boolean isSaturday() {
        return saturday;
    }

    public void setSaturday(boolean saturday) {
        this.saturday = saturday;
    }

    @Column(name = "sunday")
    @NotNull
    public boolean isSunday() {
        return sunday;
    }

    public void setSunday(boolean sunday) {
        this.sunday = sunday;
    }

}

请有人指导我如何解决这个问题。

Answer 1

如果要更新特定的现有行，那么首先有两个使用findById（someId）等函数获取行。然后调用它上面的update方法。你正在做的是插入数据库而不检查是否已经存在需要更新的行。

使用JPA save（）时重复行

1 个答案: