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hibernate annotation個人學習筆記之 @OneToOne單向關聯

package ?com.e104cn.pda.data.anno;

import ?java.io.Serializable;

import ?java.util.Date;

import ?javax.persistence.CascadeType;

import ?javax.persistence.Entity;

import ?javax.persistence.GeneratedValue;

import ?javax.persistence.GenerationType;

import ?javax.persistence.Id;

import ?javax.persistence.JoinColumn;

import ?javax.persistence.OneToOne;

import ?javax.persistence.Table;

import ?javax.persistence.Temporal;

import ?javax.persistence.TemporalType;

import ?org.hibernate.annotations.Cache;

import ?org.hibernate.annotations.CacheConcurrencyStrategy;

/**

?*??@Description:

?*??@Company:????104人力銀行

?*??@CreateDate:?2008-5-19

?*????? @author :????locey.zhang?

?*??????? @version :???1.0?????

? */

@SuppressWarnings( " serial " )

@Entity

@Table(name? = ? " AUTHOR " )

@Cache(usage? = ?CacheConcurrencyStrategy.READ_WRITE)

public ? class ?Author? implements ?Serializable {

???? private ? static ? final ? long ?serialVersionUID? = ? 7131973910486229579L ;

????

???? private ? int ?id;

????

???? private ?String?firstName;

????

???? private ?String?lastName;

????

???? private ? boolean ?male;

????

???? private ?Date?birthday;

???? private ?Book?book;

????@Id

????@GeneratedValue(strategy = GenerationType.SEQUENCE)

???? public ? int ?getId()? {

???????? return ?id;

????}

???? public ? void ?setId( int ?oid)? {

???????? this .id? = ?oid;

????}

???? public ?String?getFirstName()? {

???????? return ?firstName;

????}

???? public ? void ?setFirstName(String?firstName)? {

???????? this .firstName? = ?firstName;

????}

???? public ?String?getLastName()? {

???????? return ?lastName;

????}

???? public ? void ?setLastName(String?lastName)? {

???????? this .lastName? = ?lastName;

????}

???? public ? boolean ?isMale()? {

???????? return ?male;

????}

???? public ? void ?setMale( boolean ?male)? {

???????? this .male? = ?male;

????}

????@Temporal(value = TemporalType.TIMESTAMP)

???? public ?Date?getBirthday()? {

???????? return ?birthday;

????}

???? public ? void ?setBirthday(Date?birthday)? {

???????? this .birthday? = ?birthday;

????}

????@OneToOne(cascade = CascadeType.ALL)

????@JoinColumn(name = " book_oid " )

???? public ?Book?getBook()? {

???????? return ?book;

????}

public ? void ?setBook(Book?book)? {

???????? this .book? = ?book;

????}

????

}

Book.java

package?com.e104cn.pda.data.anno;

import?java.io.Serializable;

import?java.util.Date;

import?javax.persistence.Entity;

import?javax.persistence.GeneratedValue;

import?javax.persistence.GenerationType;

import?javax.persistence.Id;

import?javax.persistence.Table;

import?javax.persistence.Temporal;

import?javax.persistence.TemporalType;

import?org.hibernate.annotations.Cache;

import?org.hibernate.annotations.CacheConcurrencyStrategy;

/**

?*??@Description:

?*??@Company:????104人力銀行

?*??@CreateDate:?2008-5-19

?*?????@author:????locey.zhang?

?*???????@version:???1.0?????

?*/

@SuppressWarnings("serial")

@Entity

@Table(name?=?"BOOK")

@Cache(usage?=?CacheConcurrencyStrategy.READ_WRITE)

public?class?Book?implements?Serializable{

????private?static?final?long?serialVersionUID?=?-2700610405985954588L;

????

????private?int?oid;

????

????private?String?name;

????

????private?String?description;

????

????private?Date?publish;

????

????@Id

????@GeneratedValue(strategy=GenerationType.SEQUENCE)

????public?int?getOid()?{

????????return?oid;

????}

????public?void?setOid(int?oid)?{

????????this.oid?=?oid;

????}

????public?String?getName()?{

????????return?name;

????}

????public?void?setName(String?name)?{

????????this.name?=?name;

????}

????public?String?getDescription()?{

????????return?description;

????}

????public?void?setDescription(String?description)?{

????????this.description?=?description;

????}

????@Temporal(value=TemporalType.TIMESTAMP)

????public?Date?getPublish()?{

????????return?publish;

????}

????public?void?setPublish(Date?publish)?{

????????this.publish?=?publish;

????}??

????

}

@JoinColumn注釋優點與缺點
???? 1、優點??@Id可以使用主鍵生成策略 oracle為例@GeneratedValue(strategy=GenerationType.SEQUENCE)
?????2、缺點 AUTHOR表中會成額外的數據列(字段BOOK_OID)
@PrimaryKeyJoinColumn與@JoinColumn相反
?????1、優點??AUTHOR表中不會生成額外的數據列
?????2、缺點不可以使用主鍵生成策略

posted on 2008-05-21 08:19 選寶網an9 閱讀(4467) 評論(0) 編輯收藏所屬分類: 學習資料

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