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Hibernate學(xué)習(xí)筆記(五)-- 實(shí)體層設(shè)計(jì)之Table per class hierarchy

Posted on 2008-09-01 17:18 ∪∩BUG 閱讀(635) 評(píng)論(1) 編輯收藏所屬分類: Hibernate學(xué)習(xí)筆記

關(guān)于如何配置請(qǐng)參看:Hibernate學(xué)習(xí)筆記(一)--用MyEclipse 6.5+MySQL 5.0的環(huán)境跑起來

準(zhǔn)備:建表

用MySQL在名為STMS數(shù)據(jù)庫中建表Titems

src/org.lxh.hibernate4.TItems.java

package org.lxh.hibernate4;
2

/**
3

* @author ∪∩BUG E-mail: tidelgl@163.com
4

* @version Aug 31, 2008 3:27:51 PM
5

* @父類
6

*/
7

public class TItems {
8

private String id;
10

private String name;
11

private String manufacturer;
12

public String getId() {
14

return id;
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}
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public void setId(String id) {
18

this.id = id;
19

}
20

public String getName() {
22

return name;
23

}
24

public void setName(String name) {
26

this.name = name;
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}
28

public String getManufacturer() {
30

return manufacturer;
31

}
32

public void setManufacturer(String manufacturer) {
34

this.manufacturer = manufacturer;
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}
36

}
38

src/org.lxh.hibernate4.TDvds.java

package org.lxh.hibernate4;
2

/**
3

* @author ∪∩BUG E-mail: tidelgl@163.com
4

* @version Aug 31, 2008 3:34:06 PM
5

* @　繼承父類TItems
6

*/
7

public class TDvds extends TItems {
8

private String regionCode;
10

public String getRegionCode() {
12

return regionCode;
13

}
14

public void setRegionCode(String regionCode) {
16

this.regionCode = regionCode;
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}
18

}
20

src/org.lxh.hibernate4.TBooks.java

package org.lxh.hibernate4;
2

/**
4

* @author ∪∩BUG E-mail: tidelgl@163.com
5

* @version Aug 31, 2008 3:31:47 PM
6

* @ 繼承父類TItems
7

*/
8

public class TBooks extends TItems {
9

private int pageCount;
11

public int getPageCount() {
13

return pageCount;
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}
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public void setPageCount(int pageCount) {
17

this.pageCount = pageCount;
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}
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}
20

src/org.lxh.hibernate4.Titems.hbm.xml

xml version="1.0" encoding="utf-8"?>
2

DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
3

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
4

<hibernate-mapping>
8

<class name="org.lxh.hibernate4.TItems" table="titems"
9

catalog="stms">
10

<id name="id" type="java.lang.String">
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<column name="id" length="32" />
12

<generator class="assigned" />
13

id>
14

<property name="name" type="java.lang.String">
15

<column name="name" length="20" not-null="true" />
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property>
17

<property name="manufacturer" type="java.lang.String">
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<column name="manufacturer" length="20" not-null="true" />
19

property>
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<discriminator type="string" column="category">discriminator>
28

<subclass name="org.lxh.hibernate4.TBooks"
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discriminator-value="1">
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<property name="pageCount" type="java.lang.Integer">
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<column name="pageCount" />
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property>
33

subclass>
34

<subclass name="org.lxh.hibernate4.TDvds"
35

discriminator-value="2">
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<property name="regionCode" type="java.lang.String">
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<column name="regionCode" length="2" />
38

property>
39

subclass>
40

class>
41

hibernate-mapping>
42

src/hibernate.cfg.xml

xml version='1.0' encoding='UTF-8'?>
2

DOCTYPE hibernate-configuration PUBLIC
3

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
4

"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
5

<hibernate-configuration>
8

<session-factory>
10

<property name="connection.username">rootproperty>
11

<property name="connection.url">
12

jdbc:mysql://localhost:3306/STMS
13

property>
14

<property name="dialect">
15

org.hibernate.dialect.MySQLDialect
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property>
17

<property name="myeclipse.connection.profile">
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MySql_localhost
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property>
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<property name="connection.password">rootproperty>
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<property name="connection.driver_class">
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com.mysql.jdbc.Driver
23

property>
24

<property name="show_sql">trueproperty>
25

<mapping resource="org/lxh/hibernate4/Titems.hbm.xml" />
28

session-factory>
30

hibernate-configuration>

src/org.lxh.hibernate4.TItemsOperate.java

package org.lxh.hibernate4;
2

import java.util.Iterator;
4

import org.hibernate.Query;
6

import org.hibernate.Session;
7

import org.hibernate.SessionFactory;
8

import org.hibernate.cfg.Configuration;
9

/**
11

* @author ∪∩BUG E-mail: tidelgl@163.com
12

* @version Aug 31, 2008 4:08:14 PM
13

* @具體操作Hibernate類
14

*/
15

public class TItemsOperate {
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private Session session;
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public TItemsOperate() {
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//找到Hibernate配置文件
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Configuration config = new Configuration().configure();
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//從全局文件中取出SessionFactory
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SessionFactory factory = config.buildSessionFactory();
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//從SessionFactory取出一個(gè)session
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this.session = factory.openSession();
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}
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//插入操作
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//TBook和TDvd類都是TItem的子類,所以只需往TItem里插入就可以了.
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public void insert(TItems item) {
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//執(zhí)行語句
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this.session.save(item);
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//開始事務(wù).提交事務(wù)
36

this.session.beginTransaction().commit();
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this.session.close();
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}
39

//查詢操作
41

//TBooks和TDvds類都是TItems的子類,所以只需查詢TItem的ID就可以了.
42

public TItems QueryById(String id) {
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TItems item = new TItems();
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String hql = "FROM TItems as t WHERE t.id=?";
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Query q = this.session.createQuery(hql);
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q.setString(0, id);
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Iterator iter = q.list().iterator();
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if(iter.hasNext()){
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item = (TItems)iter.next();
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}
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return item;
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}
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}
54

src/org.lxh.hibernate4.Test.java

package org.lxh.hibernate4;
2

import java.awt.print.Book;
4

/**
6

* @author ∪∩BUG E-mail: tidelgl@163.com
7

* @version Aug 31, 2008 10:52:25 PM
8

* 類說明
9

*/
10

public class Test {
11

public static void main(String[] args) {
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TItemsOperate to = new TItemsOperate();
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//插入數(shù)據(jù)
17

TBooks books = new TBooks();
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books.setId("03");
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books.setManufacturer("Apache.org");
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books.setName("Struts");
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books.setPageCount(10);
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to.insert(books);
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// TDvds dvds = new TDvds();
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// dvds.setId("02");
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// dvds.setManufacturer("MySQL.com");
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// dvds.setName("MySQL");
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// dvds.setRegionCode("31");
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//
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// to.insert(dvds);
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//查詢操作
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// TBooks books = (TBooks)to.QueryById("01");
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// System.out.println(books.getName());
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}
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}
39

例子結(jié)構(gòu):

評(píng)論

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2008-09-01 17:35 by ∪∩BUG

學(xué)完這節(jié)才真正體會(huì)Hibernate的實(shí)用和強(qiáng)大.

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