System.currentTimeMillis as Id

msi_333 · **Posted:** Sat Apr 17, 2010 8:24 pm

The following example show you how to using System.currentTimeMillis() Java function to assign unique value to entity key which in following class is ( Long id ) .

Code:

package com.codemiles.jpa;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;


@Entity
@Table(name="TOPIC")
public class topic {
    @Id
    private long Id=System.currentTimeMillis();
    private String title;
    private Date creationDate;
    private Date modifedDate;
    private String content;
    

    public long getId() {
        return Id;
    }
    public void setId(long id) {
        Id = id;
    }
    
    @Column(name="TITLE")
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    
    @Column(name="CREATION_DATE")
    public Date getCreationDate() {
        return creationDate;
    }
    public void setCreationDate(Date creationDate) {
        this.creationDate = creationDate;
    }
    
    @Column(name="MODIFED_DATE")
    public Date getModifedDate() {
        return modifedDate;
    }
    public void setModifedDate(Date modifedDate) {
        this.modifedDate = modifedDate;
    }
    
    @Column(name="CONTENT")
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
}
 

System.currentTimeMillis as Id

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