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hibernate一對(duì)一例子-已更新（一）

先看由滿江紅翻譯團(tuán)隊(duì)(RedSaga Translate Team)翻譯的一對(duì)一配置說(shuō)明
一對(duì)一

持久化對(duì)象之間一對(duì)一的關(guān)聯(lián)關(guān)系是通過(guò)one-to-one元素定義的。

<one-to-one
        name="propertyName"                                          (1)
        class="ClassName"                                            (2)
        cascade="cascade_style"                                      (3)
        constrained="true|false"                                     (4)
        fetch="join|select"                                          (5)
        property-ref="propertyNameFromAssociatedClass"               (6)
        access="field|property|ClassName"                            (7)
        formula="any SQL expression"                                 (8)
        lazy="true|proxy|false"                                      (9)
        entity-name="EntityName"                                     (10)
        node="element-name|@attribute-name|element/@attribute|."
        embed-xml="true|false"
/>

(1)	`name`: 屬性的名字。
(2)	`class` (可選 - 默認(rèn)是通過(guò)反射得到的屬性類型)：被關(guān)聯(lián)的類的名字。
(3)	`cascade(級(jí)聯(lián))` (可選) 表明操作是否從父對(duì)象級(jí)聯(lián)到被關(guān)聯(lián)的對(duì)象。
(4)	`constrained(約束)` (可選) 表明該類對(duì)應(yīng)的表對(duì)應(yīng)的數(shù)據(jù)庫(kù)表，和被關(guān)聯(lián)的對(duì)象所對(duì)應(yīng)的數(shù)據(jù)庫(kù)表之間，通過(guò)一個(gè)外鍵引用對(duì)主鍵進(jìn)行約束。這個(gè)選項(xiàng)影響`save()`和`delete()`在級(jí)聯(lián)執(zhí)行時(shí)的先后順序以及決定該關(guān)聯(lián)能否被委托(也在schema export tool中被使用).
(5)	`fetch` (可選 - 默認(rèn)設(shè)置為`選擇`): 在外連接抓取或者序列選擇抓取選擇其一.
(6)	`property-ref`: (可選) 指定關(guān)聯(lián)類的屬性名，這個(gè)屬性將會(huì)和本類的主鍵相對(duì)應(yīng)。如果沒(méi)有指定，會(huì)使用對(duì)方關(guān)聯(lián)類的主鍵。
(7)	`access` (可選 - 默認(rèn)是 `property`): Hibernate用來(lái)訪問(wèn)屬性的策略。
(8)	`formula` (可選):絕大多數(shù)一對(duì)一的關(guān)聯(lián)都指向其實(shí)體的主鍵。在一些少見(jiàn)的情況中，你可能會(huì)指向其他的一個(gè)或多個(gè)字段，或者是一個(gè)表達(dá)式，這些情況下，你可以用一個(gè)SQL公式來(lái)表示。（可以在org.hibernate.test.onetooneformula找到例子）
(9)	`lazy` (可選 - 默認(rèn)為 `proxy`): 默認(rèn)情況下，單點(diǎn)關(guān)聯(lián)是經(jīng)過(guò)代理的。`lazy="true"`指定此屬性應(yīng)該在實(shí)例變量第一次被訪問(wèn)時(shí)應(yīng)該延遲抓取（fetche lazily）（需要運(yùn)行時(shí)字節(jié)碼的增強(qiáng)）。 `lazy="false"`指定此關(guān)聯(lián)總是被預(yù)先抓取。注意，如果`constrained="false"`, 不可能使用代理，Hibernate會(huì)采取預(yù)先抓取！
(10)	`entity-name` (可選): 被關(guān)聯(lián)的類的實(shí)體名。

具體配置可以看
http://www.huihoo.com/framework/hibernate/reference-v3_zh-cn/mapping.html
好。。再來(lái)測(cè)試。。。
1.建表

create ? table ?student

(sid? varchar ( 32 )? not ? null ? primary ? key ,

?sname? varchar ( 16 ),

?sage? varchar ( 16 )

)

create ? table ?address

(aid? varchar ( 32 )? not ? null ? primary ? key ,

acity? varchar ( 16 ),

aroad? varchar ( 16 )

)

2.寫(xiě)VO
?? Address vo

package?com.test;

public?class?Address

{

????private?String?aid;

????private?String?acity;

????private?String?aroad;

????private?Student?student;

??//寫(xiě)上GET?SET方法

Student vo

package?com.test;

public?class?Student

{

????private?String?sid;

????private?String?sname;

????private?String?sage;

????private?Address?address;

//寫(xiě)上get?set

3.寫(xiě)配置文件
Student.hbm.xml

<?xml?version="1.0"?>

<!DOCTYPE?hibernate-mapping

????PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD//EN"

????"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>

????<class?name="com.test.Student"?table="student"?>

????????<id?name="sid"?type="string"?unsaved-value="null"?>

????????????<column?name="sid"?sql-type="char(32)"?not-null="true"/>

????????????<generator?class="uuid.hex"/>

????????</id>

????????<property?name="sname">

????????????<column?name="sname"?sql-type="varchar(16)"?/>

????????</property>

????????<property?name="sage">

????????????<column?name="sage"?sql-type="varchar(16)"?/>

????????</property>

????????<one-to-one?name="address"?class="com.test.Address"?cascade="all"/>?

???

????</class>

</hibernate-mapping>

Address.hbm.xml

<?xml?version="1.0"?>

<!DOCTYPE?hibernate-mapping

????PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD//EN"

????"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>

????<class?name="com.test.Address"?table="address"?>

????????<id?name="aid"?type="string"?unsaved-value="null"?>

????????????<column?name="aid"?sql-type="char(32)"?not-null="true"/>

????????????<generator?class="foreign">

????????????????<param?name="property">student</param>

????????????</generator>

????????</id>

????????<property?name="acity">

????????????<column?name="acity"?sql-type="varchar(16)"?/>

????????</property>

????????<property?name="aroad">

????????????<column?name="aroad"?sql-type="varchar(16)"?/>

????????</property>

????????<one-to-one?name="student"?class="com.test.Student"/>

????</class>

</hibernate-mapping>

接著把下面的hibernate.properties文件拷到classes目錄下。。這里用的是mysql

hibernate.query.substitutions?true?1,?false?0,?yes?'Y',?no?'N'

##?MySQL

hibernate.dialect?net.sf.hibernate.dialect.MySQLDialect

hibernate.connection.driver_class?org.gjt.mm.mysql.Driver

hibernate.connection.url?jdbc:mysql://localhost:3306/wjcms

hibernate.connection.username?root

hibernate.connection.password?wujun

hibernate.connection.pool_size?1

hibernate.proxool.pool_alias?pool1

hibernate.show_sql?true

hibernate.jdbc.batch_size?0

hibernate.max_fetch_depth?1

hibernate.cache.use_query_cache?true?

4.寫(xiě)測(cè)試類了..

package?com.test;

import?net.sf.hibernate.Session;

import?net.sf.hibernate.SessionFactory;

import?net.sf.hibernate.cfg.Configuration;

import?net.sf.hibernate.*;

import?java.sql.*;

import?java.util.List;

public?class?TestOneToOne

{

????SessionFactory?sf;

????Session?session;

????public?TestOneToOne()

????{

????????try

????????{

????????????Configuration?cfg?=?new?Configuration();

????????????sf?=?cfg.addClass(Student.class).addClass(Address.class).buildSessionFactory();

????????}

????????catch(HibernateException?ex)

????????{

????????????ex.printStackTrace();

????????}

????}

????public?void?doCreate()

????{

????????try

????????{

????????????session?=?sf.openSession();

????????????Student?student?=?new?Student();

????????????student.setSname("小王");

????????????student.setSage("22");

????????????Address?address?=?new?Address();

????????????address.setAcity("深圳");

????????????address.setAroad("深南");

????????????address.setStudent(student);

????????????student.setAddress(address);

????????????session.save(student);

????????????session.flush();

????????????session.connection().commit();

????????}

????????catch(HibernateException?ex)

????????{

????????????ex.printStackTrace();

????????}

????????catch(SQLException?ex1)

????????{

????????????ex1.printStackTrace();

????????}

????????finally

????????{

????????????????try{

????????????????????session.close();

????????????????}

????????????????catch(HibernateException?ex2){

????????????????}

????????}

????}

????public?void?doQuery()

????{

????????try{

????????????session?=?sf.openSession();

????????????Query?q?=?session.createQuery("select?s?from?Student?as?s");

????????????List?l?=?q.list();

????????????Student?s?=?null;

????????????Address?address?=?null;

????????????for(int?i=0;i<l.size();i++)

????????????{

????????????????s?=?(Student)l.get(i);

????????????????System.out.println("姓名：?"+s.getSname());

????????????????System.out.println("年齡：?"+s.getSage());

????????????????address?=?s.getAddress();

????????????????System.out.println("住址:??"+address.getAcity()+address.getAroad());

????????????}

????????}

????????catch(HibernateException?ex){

????????????ex.printStackTrace();

????????}

????????finally{

????????????try{

????????????????session.close();

????????????}

????????????catch(HibernateException?ex2){

????????????}

????????}

????}

????public?static?void?main(String[]?args)

????{

????????TestOneToOne?t?=?new?TestOneToOne();

????????//t.doCreate();

????????t.doQuery();

????}

}

posted on 2006-04-06 16:05 record java and net 閱讀(6059) 評(píng)論(3) 編輯收藏所屬分類: java

評(píng)論

# re: hibernate一對(duì)一例子-方便以后查看（一） 2006-04-13 11:45 foreverjiang

<one-to-one name="address" class="com.test.Address" cascade="all"/>

<one-to-one name="student" class="com.test.Student"/>

這里的2個(gè)一對(duì)一都對(duì)應(yīng)什么，只要定義一對(duì)一的字段，無(wú)需定義別的嗎回復(fù) 更多評(píng)論

# re: hibernate一對(duì)一例子-已更新（一） 2006-04-22 09:50 吳某人-不斷地學(xué)習(xí)

是的。。

回復(fù) 更多評(píng)論

# re: hibernate一對(duì)一例子-已更新（一） 2008-04-29 10:52 xx

寫(xiě)一個(gè)級(jí)聯(lián)刪除的例子吧。
搞不定回復(fù) 更多評(píng)論

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# re: hibernate一對(duì)一例子-方便以后查看（一） 2006-04-13 11:45 foreverjiang

# re: hibernate一對(duì)一例子-已更新（一） 2006-04-22 09:50 吳某人-不斷地學(xué)習(xí)

# re: hibernate一對(duì)一例子-已更新（一） 2008-04-29 10:52 xx

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