Hibernate 中 联合主键映射 组合关系映射 大对象映射(或者说文本大对象,二进制数据大对象)
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Clob:文本大对象,最长4G
Blob:二进制数据大对象,最长4G
util:
public class HibUtil {
private static SessionFactory sessionFactory;
static{
//获取配置信息 hibernate.cfg.xml
Configuration configuration = new Configuration().configure();
//创建一个 ServiceRegistry的实例
//首先获得其标准建造器,此处用了建造者模式 builder模式来创建对象
//创建一个标准的构建器
StandardServiceRegistryBuilder ssb = new StandardServiceRegistryBuilder();
//建造(得到)ServiceRegistry的实例此处一定要传入//configuration.getProperties()否则会报错UnsupportedOperationException
ServiceRegistry build = ssb.applySettings(configuration.getProperties()).build();
//获得session工厂 一个数据库对应一个 SessionFactory
sessionFactory = configuration.buildSessionFactory(build);
}
public static Session getSession(){
return sessionFactory.openSession();
}
public static void main(String[] args) {
}
}
hibernate.cfg.xml:
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 1:链接数据库的配置 -->
<property name="hibernate.dialect">
org.hibernate.dialect.Oracle10gDialect
</property>
<property name="hibernate.connection.driver_class">
oracle.jdbc.driver.OracleDriver
</property>
<property name="hibernate.connection.username">scott</property>
<property name="hibernate.connection.password">tiger</property>
<property name="hibernate.connection.url">
jdbc:oracle:thin:@localhost:1521:orcl
</property>
<!-- 2: 全局性配置 -->
<property name="hibernate.show_sql">true</property>
<property name="hibernate.format_sql">true</property>
<!-- 仅供测试时使用 ,公司内禁止使用 -->
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- 3: 映射文件的配置 -->
<mapping resource="com/huawei/hib/po/Person.hbm.xml" />
</session-factory>
</hibernate-configuration>
po:
public class Address {
private Integer addrId;
private String addrName;
public Integer getAddrId() {
return addrId;
}
public void setAddrId(Integer addrId) {
this.addrId = addrId;
}
public String getAddrName() {
return addrName;
}
public void setAddrName(String addrName) {
this.addrName = addrName;
}
}
public class PersonName {
private String firstName;
private String lastName;
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;
}
}
import java.sql.Blob;
import java.sql.Clob;
public class Person {
private PersonName personName;
private Integer age;
private Clob txtObj;
private Blob imgObj;
private Address address;
public PersonName getPersonName() {
return personName;
}
public void setPersonName(PersonName personName) {
this.personName = personName;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Clob getTxtObj() {
return txtObj;
}
public void setTxtObj(Clob txtObj) {
this.txtObj = txtObj;
}
public Blob getImgObj() {
return imgObj;
}
public void setImgObj(Blob imgObj) {
this.imgObj = imgObj;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
Person.hbm.xml:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping
package="com.huawei.hib.po">
<class name="Person" table="test_person" >
<!-- 联合主键映射 -->
<composite-id name="personName" class="PersonName">
<key-property name="firstName" column="first_name" />
<key-property name="lastName" column="last_name" />
</composite-id>
<property name="age" />
<property name="txtObj" column="txt_Obj" />
<property name="imgObj" column="img_Obj" />
<!--组合关系映射 -->
<component name="address" class="Address">
<property name="addrId" column="addr_id" />
<property name="addrName" column="addr_name" />
</component>
</class>
</hibernate-mapping>
dao:
public class PersonDao {
public static void main(String[] args) throws FileNotFoundException {
Session session = HibUtil.getSession();
Address address = new Address();
address.setAddrId(1);
address.setAddrName("成都");
PersonName personName = new PersonName();
personName.setFirstName("三");
personName.setLastName("张");
Person p = new Person();
p.setPersonName(personName);
p.setAge(20);
Blob imgObj = Hibernate.getLobCreator(session).createBlob(new FileInputStream("E:/123.jpg"),1200000);
Clob txtObj = Hibernate.getLobCreator(session).createClob("成都是个美丽的地方");
p.setTxtObj(txtObj);
p.setImgObj(imgObj);
p.setAddress(address);
Transaction tx = session.beginTransaction();
session.save(p);
tx.commit();
session.close();
}
}
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