數據庫結構

create table component(name varchar(50) not null,
?????????????????????? sex varchar(50) not null,
?????????????????????? description varchar(50),
?????????????????????? primary key(name,sex));

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主鍵類，一定要實現Serializable接口，并改寫equals和hascode方法

?

package ?component;

import ?java.io.Serializable;

import ?org.apache.commons.lang.builder.EqualsBuilder;
import ?org.apache.commons.lang.builder.HashCodeBuilder;

public ? class ?ComponentPK? implements ?Serializable? ... {
?? private ?String?name;
?? private ?String?sex;

public ?String?getName()? ... {
???? return ?name;
}
public ? void ?setName(String?name)? ... {
???? this .name? = ?name;
}
public ?String?getSex()? ... {
???? return ?sex;
}
public ? void ?setSex(String?sex)? ... {
???? this .sex? = ?sex;
}
public ? boolean ?equals(Object?obj)? ... {
???? if (obj? == ? this )? ... {
???????? return ? true ;
????}
????
???? if ( ! (obj? instanceof ?Component))? ... {
???????? return ? false ;
????}
????
????ComponentPK?componentpk? = ?(ComponentPK)?obj;
???? return ? new ?EqualsBuilder()
??????????.append( this .name,?componentpk.getName())
??????????.append( this .sex,?componentpk.getSex())
??????????.isEquals();
????
??}
??
?? public ? int ?hashCode()? ... {
???? return ? new ?HashCodeBuilder()
??????????.append( this .name)
??????????.append( this .sex)
??????????.toHashCode();
??}

}

?

?

package ?component;

public ? class ?Component? ... {
?? private ?String?description;
?? private ?ComponentPK?componentpk;
public ?ComponentPK?getComponentpk()? ... {
???? return ?componentpk;
}
public ? void ?setComponentpk(ComponentPK?componentpk)? ... {
???? this .componentpk? = ?componentpk;
}
public ?String?getDescription()? ... {
???? return ?description;
}
public ? void ?setDescription(String?description)? ... {
???? this .description? = ?description;
}
}

?

HBM文件

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<? xml?version="1.0"?encoding="utf-8" ?>
<! DOCTYPE?hibernate-mapping?PUBLIC?"-//Hibernate/Hibernate?Mapping?DTD?3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<!-- ?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
< hibernate-mapping? package ="component" > ?

?? < class? name ="Component" ?table ="component" > ?
???? < composite-id? name ="componentpk"
??????????????class ="ComponentPK"
??????????????unsaved-value ="any" >
???????? < key-property? name ="name" ?
????????????????column ="name" ?
????????????????type ="java.lang.String" />
???????? < key-property? name ="sex" ?
????????????????column ="sex" ?
????????????????type ="java.lang.String" />
???? </ composite-id >
????
???? < property? name ="description" ?column ="description" ?type ="java.lang.String" />
??
?? </ class > ?

</ hibernate-mapping >

?

?

測試代碼：

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public ? static ? void ?main(String[]?args)? ... {
????????Configuration?cfg = new ?Configuration();
????????cfg.configure();
????????SessionFactory?sf = cfg.buildSessionFactory();
????????Session?session = sf.openSession();
????????Transaction?t = session.beginTransaction();
????????
????????ComponentPK?pk = new ?ComponentPK();
????????pk.setName( " 1 " );
????????pk.setSex( " 3 " );
????????
????????Component?component = new ?Component();
????????component.setComponentpk(pk);
????????component.setDescription( " 12 " );
????????session.save(component);
????????t.commit();
????????System.out.println( " success " );

????}

?

?

如果組成復合主鍵的某一個屬性是其他持久話類的話，則需要使用<key many-to-one>

增加表User:

CREATE TABLE `user` (
? `id` varchar(50) NOT NULL,
? `pass` varchar(50) default NULL,
? PRIMARY KEY? (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gb2312;??

增加持久化類User及相應的Mapping文件

?

package ?component;

public ? class ?User? ... {
??? private ?String?id;
??? private ?String?pass;
public ?String?getId()? ... {
???? return ?id;
}
public ? void ?setId(String?id)? ... {
???? this .id? = ?id;
}
public ?String?getPass()? ... {
???? return ?pass;
}
public ? void ?setPass(String?pass)? ... {
???? this .pass? = ?pass;
}
}

<?xml?version = " 1.0 " ?encoding = " utf-8 " ?>
<!DOCTYPE?hibernate-mapping?PUBLIC? " -//Hibernate/Hibernate?Mapping?DTD?3.0//EN "
" http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd " >
<!--?
????Mapping?file?autogenerated?by?MyEclipse?-?Hibernate?Tools
-->
<hibernate-mapping?package = " component " >?

??<class?name = " User " ?table = " user " >?
???
????<id?name = " id " ?column = " id " >
??????<generator?class = " assigned " ></generator>
????</id>
????<property?name = " pass " ?column = " pass " ?type = " java.lang.String " />
??
??</class>?

</hibernate-mapping>

修改ComponentPK類

?

package ?component;

import ?java.io.Serializable;

import ?org.apache.commons.lang.builder.EqualsBuilder;
import ?org.apache.commons.lang.builder.HashCodeBuilder;

public ? class ?ComponentPK? implements ?Serializable? ... {
?? private ?String?name;
?? private ?String?sex;
?? private ?User?user;
public ?User?getUser()? ... {
???? return ?user;
}

兩種方式配置Hibernate復合主鍵(修正)