How can I set variable annotated with @Transient form a setter of non transient variable in spring J-CodePudding

I am trying to set the time variable while the Date and Time variable is getting initialized by spring JPA but I am getting null in the time string. How should I approach this problem ?

@Entity
@Table(name = "cap_ratio")
public class CapacitiveInfoModel {
    @Id
    @Column(name = "time")
    private Date dateAndTime;
    @Transient
    private String time;

    public Date getDateAndTime() {
        return dateAndTime;
    }
    public void setDateAndTime(Date dateAndTime) {
        this.dateAndTime = dateAndTime;
        this.time = DateAndTimeUtil.getFormattedDateAndTimeString(dateAndTime, "HH:mm");
    }
    public String getTime() {
        return time;
    }
}

CodePudding user response：

Firstly, When you are using the @Transient annotation it means that the field will not persist in database since you are using jpa it is preferred to import this package javax.persistence.Transient.

Further instead of taking time as String data type you can import the Date of util package and provide the Date data type for time and also provide annotation as @Temporal(TemporalType.TIME). I hope this should work. Also I would like to suggest you to give relevant column name as you have given time column name for dateAndTime field.

CodePudding user response：

You may use 'transient' keyword instead of 'transient' annotation. Also you can use @CreationTimestamp annotation for inserting time at an instant when it's value getting saved in database. For more info you can even read springs documentation by referring to the provided link: https://www.baeldung.com/jpa-transient-ignore-field

Hopefully it'll work. Thanks