程序员的量化交易之路(17)--Cointrader之Temporal实体(5)
这一小节说明一个时间实体Temporal实体,它的代码很简单。
package org.cryptocoinpartners.schema; import java.util.Date; import javax.persistence.Basic; import javax.persistence.MappedSuperclass; import javax.persistence.Transient; import org.hibernate.annotations.Type; import org.joda.time.Instant; /** * @author Tim Olson */
//这个标注说明这个类也是一个基类,不会在数据库中创建表 @MappedSuperclass public class Temporal extends EntityBase { public Temporal(Instant time) { super(); this.time = time; this.dateTime = time.toDate(); this.timestamp = time.getMillis(); } /** For Events, this is the time the Event itself occured, not the time we received the Event. It should be remote * server time if available, and local time if the object was created locally */
/@/Type注解用于说明类型 @Type(type = "org.jadira.usertype.dateandtime.joda.PersistentInstantAsMillisLong") @Basic(optional = false) public Instant getTime() { return time; } //这个注解用于说明该字段不会存储到数据库中 @Transient public Date getDateTime() { return dateTime; } @Transient public long getTimestamp() { return timestamp; } // JPA protected Temporal() { } protected void setTime(Instant time) { this.time = time; this.dateTime = time.toDate(); this.timestamp = time.getMillis(); } protected Instant time;//时间 private long timestamp;//时间截 private Date dateTime;//日期 }
需要说明的是,这个类
本站文章为和通数据库网友分享或者投稿,欢迎任何形式的转载,但请务必注明出处.
同时文章内容如有侵犯了您的权益,请联系QQ:970679559,我们会在尽快处理。