开发中Hibernate annotation 中@Transient的使用

@Transient的作用 : 

用于注释pojo对象中的属性，被注释的属性将成为短暂的，不会持久化到数据库的“短暂”属性。

Hibernate annotation 的实体类中如果存在数据库中没有的字段,也就是我们常说的根据业务需求临时

添加的一些字段供我们存放数据,那么就需要在新添加的这个字段中加上 @Transient  


import java.sql.Blob;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

/**
 * @类功能说明：基本信息表
 * @创建时间：2013-6-18 上午10:15:45
 * @版本：V1.0
 */
@Entity
@Table(name = "baseinfo")
public class NationCheckunitBaseinfo implements java.io.Serializable {

	// Fields
	private static final long serialVersionUID = 4141383356877794599L;
	private String uuid;
	private String route;
	private Blob pic;
	private Date lastUpdateTime;
	//加签之后的字段
	private String signField;
	//验签返回值
	private String signFlag;
	// Constructors

	/** default constructor */
	public NationCheckunitBaseinfo() {
	}

	/** minimal constructor */
	public NationCheckunitBaseinfo(String uuid) {
		this.uuid = uuid;
	}

	/** full constructor */
	public NationCheckunitBaseinfo(String uuid, String route,
			Blob pic, Date lastUpdateTime,String signField) {
		this.uuid = uuid;
		this.route = route;
		this.pic = pic;
		this.lastUpdateTime = lastUpdateTime;
		this.signField = signField;
	}

	// Property accessors
	@Id
	@Column(name = "UUID", unique = true, nullable = false, length = 36)
	public String getUuid() {
		return this.uuid;
	}

	public void setUuid(String uuid) {
		this.uuid = uuid;
	}


	@Column(name = "ROUTE", length = 100)
	public String getRoute() {
		return this.route;
	}

	public void setRoute(String route) {
		this.route = route;
	}

	@Column(name = "PIC")
	public Blob getPic() {
		return this.pic;
	}

	public void setPic(Blob pic) {
		this.pic = pic;
	}

	@Temporal(TemporalType.DATE)
	@Column(name = "LAST_UPDATE_TIME", length = 10)
	public Date getLastUpdateTime() {
		return this.lastUpdateTime;
	}

	public void setLastUpdateTime(Date lastUpdateTime) {
		this.lastUpdateTime = lastUpdateTime;
	}

	@Column(name = "SIGN_FIELD", length = 250)
	public String getSignField() {
		return signField;
	}

	public void setSignField(String signField) {
		this.signField = signField;
	}

	@Transient
	public String getSignFlag() {
		return signFlag;
	}

	public void setSignFlag(String signFlag) {
		this.signFlag = signFlag;
	}

}

 

数据库中将不会出现signFlag对应的字段

使用的时候,该字段可以直接存储到实体类中

NationCheckunitBaseinfo baseinfo = list.get(i);

//将验签返回结果放到实体类的flag字段中

String result = getSignResult(baseinfo);

baseinfo .setSignFlag(result);

也可以存放到map中
 

Map map = list.get(i);
String nSignFlag = getSignResult(uuid,1, cardType,cardNumber,name,credentialCode);
String sSignFlag = getSignResult(uuid,2, checkIspass,examCardNum,getCardStatus,ttCode);
//将验签返回结果放到实体类的flag字段中
list.get(i).put("nSignFlag", nSignFlag);
list.get(i).put("sSignFlag", sSignFlag);

页面上:遍历时,该字段与其他字段一样使用