在hibernate3中,one-to-one关联主要通过3种方式来实现:
(1)共享的关联主键
(2)主外键关联
(3)通过关联表关联
其中,第一和第二中关联很常见,第三种关联因为效率关系很少使用。
下面是主外键关联简单的例子:
create table person (
person_id bigint primary key,
name varchar(255) not null,
address_id bigint,
passport_id bigint,
unique(address_id),
unique(passport_id),
foreign key (address_id) references address(address_id),
foreign key (passport_id) references passport(passport_id)
);
create table address(
address_id bigint primary key,
country varchar(255),
city varchar(255),
street varchar(255)
);
create table passport (
passport_id bigint primary key,
num varchar(255)
);
package domain;
import java.io.Serializable;
public class Person implements Serializable {
private Long id;
private String name;
private Address address;
private Passport passport;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public Passport getPassport() {
return passport;
}
public void setPassport(Passport passport) {
this.passport = passport;
}
}
package domain;
import java.io.Serializable;
public class Address implements Serializable {
private Long id;
private String country;
private String city;
private String street;
private Person person;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
package domain;
import java.io.Serializable;
public class Passport implements Serializable {
private Long id;
private String num;
private Person person;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="domain.Person" table="person" dynamic-insert="true" >
<id name="id" column="person_id">
<generator class="sequence" >
<param name="sequence">seq</param>
</generator>
</id>
<property name="name" column="name" not-null="true" />
<many-to-one name="address" class="domain.Address" column="address_id" cascade="all" unique="true" />
<many-to-one name="passport" class="domain.Passport" column="passport_id" cascade="all" unique="true" />
</class>
</hibernate-mapping>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="domain.Address" table="address" dynamic-insert="true" >
<id name="id" column="address_id">
<generator class="foreign" >
<param name="property">person</param>
</generator>
</id>
<property name="country" column="country" not-null="true" />
<property name="city" column="city" not-null="true" />
<property name="street" column="street" not-null="true" />
<one-to-one name="person" class="domain.Person" property-ref="address" />
</class>
</hibernate-mapping>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="domain.Passport" table="passport" dynamic-insert="true" >
<id name="id" column="passport_id">
<generator class="foreign" >
<param name="property">person</param>
</generator>
</id>
<property name="num" column="num" not-null="true" />
<one-to-one name="person" class="domain.Person" property-ref="passport" />
</class>
</hibernate-mapping>
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