hibernate 关联关系映射配置

Hibernate关联关系映射配置

一、 一对一单向外键关联：

1.1目录结构

1.2 Annotation方式

1.2.1 类图



1.2.2数据库表结构



1.2.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HUSBAND_")
@SequenceGenerator(name="husband_seq_gene", sequenceName="HUSBAND_SEQ", allocationSize=1)
public class Husband {
private BigDecimal id;
private String name;
private Wife wife;
@Id
@Column(precision=4, scale=0)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="husband_seq_gene")
public BigDecimal getId() {
return id;
}
@Column(length=30)
public String getName() {
return name;
}
@OneToOne
//@JoinColumn(name="wife_id")//不写也没问题，自动生成的字段也叫wife_id
public Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
@Entity(name="H_WIFE_")
@SequenceGenerator(name="wife_seq_gene", sequenceName="WIFE_SEQ")
public class Wife {
private BigDecimal id;
private String name;
@Id
@Column(precision=4)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="wife_seq_gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
@Column(length=30)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

1.3 XML方式

1.3.1 类图



1.3.2 数据库表结构



1.3.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Husband {
private BigDecimal id;
private String name;
private XML_Wife wife;
public BigDecimal getId() {
return id;
}
public String getName() {
return name;
}
public XML_Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(XML_Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Wife {
private BigDecimal id;
private String name;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

1.3.4 对象关系映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Husband" table="H_HUSBAND_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30"></property>
<many-to-one name="wife" column="wife_id" unique="true" not-null="true" />
<!--many-to-one是站在当前类XML_Husband的角度来看，XML_Husband与wife是多对一-->
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Wife" table="H_Wife_XML" dynamic-update="true">
<id name="id">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30" />
</class>
</hibernate-mapping>

1.4 Hibernate配置文件

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@127.0.0.1:1521:silence</property>
<property name="connection.username">cnuser</property>
<property name="connection.password">cn830306</property>
<property name="connection.pool_size">1</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<!--<property name="hbm2ddl.auto">update</property>-->
<mapping class="com.rongqq.hibernate3.annotation.entity.Husband" />
<mapping class="com.rongqq.hibernate3.annotation.entity.Wife" />
<mapping resource="com/rongqq/hibernate3/xml/entity/XML_Husband.hbm.xml" />
<mapping resource="com/rongqq/hibernate3/xml/entity/XML_Wife.hbm.xml" />
</session-factory>
</hibernate-configuration>

二、一对一双向外键关联

2.1 Annotation方式

2.1.1 类图



2.1.2 数据库结构图



2.1.3 实体类

@Entity(name="H_HUSBAND_")
@SequenceGenerator(name="husband_seq_gene", sequenceName="HUSBAND_SEQ", allocationSize=1)
public class Husband {
private BigDecimal id;
private String name;
private Wife wife;
@Id
@Column(precision=4, scale=0)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="husband_seq_gene")
public BigDecimal getId() {
return id;
}
@Column(length=30)
public String getName() {
return name;
}
@OneToOne
//@JoinColumn(name="wife_id")//不写也没问题，自动生成的字段也叫wife_id
public Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}

@Entity(name="H_WIFE_")
@SequenceGenerator(name="wife_seq_gene", sequenceName="WIFE_SEQ")
public class Wife {
private BigDecimal id;
private String name;
private Husband husband;
@Id
@Column(precision=4)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="wife_seq_gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
@Column(length=30)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToOne(mappedBy="wife")
public Husband getHusband() {
return husband;
}
public void setHusband(Husband husband) {
this.husband = husband;
}
}

2.2 XML方式

2.2.1 类图



2.2.2 数据库结构图



2.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Husband {
private BigDecimal id;
private String name;
private XML_Wife wife;
public BigDecimal getId() {
return id;
}
public String getName() {
return name;
}
public XML_Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(XML_Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Wife {
private BigDecimal id;
private String name;
private XML_Husband husband;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public XML_Husband getHusband() {
return husband;
}
public void setHusband(XML_Husband husband) {
this.husband = husband;
}
}

2.2.4 对象关系映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Husband" table="H_HUSBAND_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30"></property>
<many-to-one name="wife" unique="true" not-null="true" >
<column name="wife_id" precision="4"></column>
</many-to-one>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Wife" table="H_Wife_XML" dynamic-update="true">
<id name="id">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30" />
<!-- 这里的wife是XML_Husband类中的属性名，表示这里的关联关系已经由Husband的对象
映射文件的wife属性上定义过了 -->
<one-to-one name="husband" property-ref="wife" />
</class>
</hibernate-mapping>

三、一对一单向主键关联（不重要）

3.1 Annotation方式

3.1.1 类图



3.1.2 数据库表结构



3.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HUSBAND_")
@SequenceGenerator(name="husband_seq_gene", sequenceName="HUSBAND_SEQ", allocationSize=1)
public class Husband {
private BigDecimal id;
private String name;
private Wife wife;
@Id
@Column(precision=4, scale=0)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="husband_seq_gene")
public BigDecimal getId() {
return id;
}
@Column(length=30)
public String getName() {
return name;
}
@OneToOne
@PrimaryKeyJoinColumn
public Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
@Entity(name="H_WIFE_")
@SequenceGenerator(name="wife_seq_gene", sequenceName="WIFE_SEQ")
public class Wife {
private BigDecimal id;
private String name;
@Id
@Column(precision=4)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="wife_seq_gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
@Column(length=30)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

注：只生成了表，但是没有外键约束，具体实现还需要查找

3.2 XML方式

3.2.1 类图



3.2.2 数据库表结构



3.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Husband {
private BigDecimal id;
private String name;
private XML_Wife wife;
public BigDecimal getId() {
return id;
}
public String getName() {
return name;
}
public XML_Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(XML_Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import com.rongqq.hibernate3.annotation.entity.Husband;
public class XML_Wife {
private BigDecimal id;
private String name;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

3.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Husband" table="H_HUSBAND_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="id" precision="4" scale="0" />
<generator class="foreign">
<!--  指明具体参考哪一个外键，因为一张表可能存在多个外键 -->
<param name="property">wife</param>
</generator>
</id>
<property name="name" length="30"></property>
<one-to-one name="wife" constrained="true"></one-to-one>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Wife" table="H_Wife_XML" dynamic-update="true">
<id name="id">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30" />
</class>
</hibernate-mapping>

四、一对一双向主键关联（不重要）

4.1 Annotation方式

4.1.1 类图



4.1.2 数据库表结构



4.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HUSBAND_")
@SequenceGenerator(name="husband_seq_gene", sequenceName="HUSBAND_SEQ", allocationSize=1)
public class Husband {
private BigDecimal id;
private String name;
private Wife wife;
@Id
@Column(precision=4, scale=0)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="husband_seq_gene")
public BigDecimal getId() {
return id;
}
@Column(length=30)
public String getName() {
return name;
}
@OneToOne
@PrimaryKeyJoinColumn
public Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.SequenceGenerator;
@Entity(name="H_WIFE_")
@SequenceGenerator(name="wife_seq_gene", sequenceName="WIFE_SEQ")
public class Wife {
private BigDecimal id;
private String name;
private Husband husband;
@Id
@Column(precision=4)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="wife_seq_gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
@Column(length=30)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToOne
@PrimaryKeyJoinColumn
public Husband getHusband() {
return husband;
}
public void setHusband(Husband husband) {
this.husband = husband;
}
}

注：同样不产生关联关系，具体实现待查

4.2 XML方式

4.2.1 类图



4.2.2 数据库表结构



4.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Husband {
private BigDecimal id;
private String name;
private XML_Wife wife;
public BigDecimal getId() {
return id;
}
public String getName() {
return name;
}
public XML_Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(XML_Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Wife {
private BigDecimal id;
private String name;
private XML_Husband husband;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public XML_Husband getHusband() {
return husband;
}
public void setHusband(XML_Husband husband) {
this.husband = husband;
}
}

4.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Husband" table="H_HUSBAND_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="id" precision="4" scale="0" />
<generator class="foreign">
<param name="property">wife</param>
</generator>
</id>
<property name="name" length="30"></property>
<one-to-one name="wife" constrained="true"></one-to-one>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Wife" table="H_Wife_XML" dynamic-update="true">
<id name="id">
<column name="id" precision="4" scale="0" />
<generator class="sequence">
<param name="sequence">H_STUDENT_SEQ_XML</param>
</generator>
</id>
<property name="name" length="30" />
<one-to-one name="husband" property-ref="wife"></one-to-one>
</class>
</hibernate-mapping>

五、组件映射

5.1 Annotation方式

5.1.1 类图



5.1.2 数据库表结构



5.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HUSBAND_")
@SequenceGenerator(name="husband_seq_gene", sequenceName="HUSBAND_SEQ", allocationSize=1)
public class Husband {
private BigDecimal id;
private String name;
private Wife wife;
@Id
@Column(precision=4, scale=0)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="husband_seq_gene")
public BigDecimal getId() {
return id;
}
@Column(length=30)
public String getName() {
return name;
}
@Embedded
public Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
public class Wife {
private String name;
private BigDecimal age;
@Column(name="wifeName")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Column(precision=3)
public BigDecimal getAge() {
return age;
}
public void setAge(BigDecimal age) {
this.age = age;
}
}

5.2 XML方式

5.2.1 类图



5.2.2 数据库表结构



5.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Husband {
private BigDecimal id;
private String name;
private XML_Wife wife;
public BigDecimal getId() {
return id;
}
public String getName() {
return name;
}
public XML_Wife getWife() {
return wife;
}
public void setId(BigDecimal id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(XML_Wife wife) {
this.wife = wife;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Wife {
private String name;
private BigDecimal age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public BigDecimal getAge() {
return age;
}
public void setAge(BigDecimal age) {
this.age = age;
}
}

5.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Husband" table="H_HUSBAND_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="id" precision="4" scale="0" />
<generator class="foreign">
<param name="property">wife</param>
</generator>
</id>
<property name="name" length="30"></property>
<component name="wife">
<property name="name" column="WIFENAME" />
<property name="age" column="AGE" precision="3" />
</component>
</class>
</hibernate-mapping>

六、多对一单向关联

6.1 Annotation方式

6.1.1 类图（说明：一个人具备多套房子的所有权，这么多套房子属于这个人）



6.1.2 数据库表结构



6.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HOUSE_")
@SequenceGenerator(name="HouseGene", sequenceName="H_HOUSE_SEQ", allocationSize=1)
public class House {
private BigDecimal id;
private String position;
private Person person;//House(多)-Person(一)，一个人可以有多个房子，而这些房子属于这一个人
@Id
@Column(precision=20)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="HouseGene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
@ManyToOne
//@JoinColumn(name=””)//可以指定外键名称
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
@Entity(name="H_PERSON_")
@SequenceGenerator(name="PersonGene", sequenceName="H_PERSON_SEQ", allocationSize=1)
public class Person {
private BigDecimal Id;
private String name;
@Id
@Column(precision=21)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="PersonGene")
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

6.2 XML方式

6.2.1 类图（说明：一个人具备多套房子的所有权，这么多套房子属于这个人）



6.2.2 数据库表结构



6.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_House {
private BigDecimal id;
private String position;
private XML_Person person;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
public XML_Person getPerson() {
return person;
}
public void setPerson(XML_Person person) {
this.person = person;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Person {
private BigDecimal Id;
private String name;
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

6.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_House" table="H_HOUSE_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="20" scale="0" />
<generator class="sequence">
<param name="sequence">H_HOUSE_XML_SEQ</param>
</generator>
</id>
<property name="position"></property>
<many-to-one name="person">
<column name="PERSON_ID" precision="21" scale="0" />
</many-to-one>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Person" table="H_PERSON_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="21" scale="0" />
<generator class="sequence">
<param name="sequence">H_XML_PERSON_SEQ</param>
</generator>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

注：（表）设计原则，在多的一方加外键

七、一对多单向关联

7.1 Annotation方式

7.1.1 类图（说明：一个人具备多套房子的所有权，这么多套房子属于这个人）



7.1.2 数据库表结构



7.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
@Entity(name="H_PERSON_")
@SequenceGenerator(name="PersonGene", sequenceName="H_PERSON_SEQ", allocationSize=1)
public class Person {
private BigDecimal Id;
private String name;
private Set<House> houses = new HashSet<House>();
@Id
@Column(precision=21)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="PersonGene")
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany
@JoinColumn(name="HOUSE_ID")//不加会生成由一张中间表连接的共三张表
public Set<House> getHouses() {
return houses;
}
public void setHouses(Set<House> houses) {
this.houses = houses;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HOUSE_")
@SequenceGenerator(name="HouseGene", sequenceName="H_HOUSE_SEQ", allocationSize=1)
public class House {
private BigDecimal id;
private String position;
@Id
@Column(precision=20)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="HouseGene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
}

7.2 XML方式

7.2.1 类图（说明：一个人具备多套房子的所有权，这么多套房子属于这个人）



7.2.2 数据库表结构



7.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
public class XML_Person {
private BigDecimal Id;
private String name;
private Set<XML_House> houses = new HashSet<XML_House>();
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<XML_House> getHouses() {
return houses;
}
public void setHouses(Set<XML_House> houses) {
this.houses = houses;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_House {
private BigDecimal id;
private String position;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
}

7.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Person" table="H_PERSON_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="21" scale="0" />
<generator class="sequence">
<param name="sequence">H_XML_PERSON_SEQ</param>
</generator>
</id>
<property name="name"/>
<set name="houses">
<key><!-- 指定H_HOUSE_XML表中的外键字段名，也可以<key column="PERSON_ID" /> -->
<column name="PERSON_ID" precision="21" />
</key>
<one-to-many class="XML_House"/>
</set>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_House" table="H_HOUSE_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="20" scale="0" />
<generator class="sequence">
<param name="sequence">H_HOUSE_XML_SEQ</param>
</generator>
</id>
<property name="position"></property>
</class>
</hibernate-mapping>

八、一对多、多对一双向关联

8.1 Annotation方式

8.1.1 类图



8.1.2 数据库表结构



8.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
@Entity(name="H_HOUSE_")
@SequenceGenerator(name="HouseGene", sequenceName="H_HOUSE_SEQ", allocationSize=1)
public class House {
private BigDecimal id;
private String position;
private Person person;
@Id
@Column(precision=20)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="HouseGene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
@ManyToOne//如果需要指定外键字段使用@JoinColumn(name="PERSON_ID")
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
@Entity(name="H_PERSON_")
@SequenceGenerator(name="PersonGene", sequenceName="H_PERSON_SEQ", allocationSize=1)
public class Person {
private BigDecimal Id;
private String name;
private Set<House> houses = new HashSet<House>();
@Id
@Column(precision=21)
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="PersonGene")
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(mappedBy="person")//参考了对方的属性名
public Set<House> getHouses() {
return houses;
}
public void setHouses(Set<House> houses) {
this.houses = houses;
}
}

8.2 XML方式

8.2.1 类图



8.2.2 数据库表结构



8.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_House {
private BigDecimal id;
private String position;
private XML_Person person;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getPosition() {
return position;
}
public void setPosition(String position) {
this.position = position;
}
public XML_Person getPerson() {
return person;
}
public void setPerson(XML_Person person) {
this.person = person;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
public class XML_Person {
private BigDecimal Id;
private String name;
private Set<XML_House> houses = new HashSet<XML_House>();
public BigDecimal getId() {
return Id;
}
public void setId(BigDecimal id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<XML_House> getHouses() {
return houses;
}
public void setHouses(Set<XML_House> houses) {
this.houses = houses;
}
}

8.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Person" table="H_PERSON_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="21" scale="0" />
<generator class="sequence">
<param name="sequence">H_XML_PERSON_SEQ</param>
</generator>
</id>
<property name="name"/>
<set name="houses">
<key>
<!—关联表中指向当前类对应表的外键字段名，也可以<key column="PERSON_ID" /> -->
<column name="PERSON_ID" precision="21" />
</key>
<one-to-many class="XML_House"/>
</set>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_House" table="H_HOUSE_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="20" scale="0" />
<generator class="sequence">
<param name="sequence">H_HOUSE_XML_SEQ</param>
</generator>
</id>
<property name="position"/>
<many-to-one name="person" column="PERSON_ID"/>
<!-- 字段名与对应的XML_Person.hbm.xml中配置的set的key中column的值必须一致 -->
</class>
</hibernate-mapping>

九、多对多单向关联

9.1 Annotation方式

9.1.1 类图



9.1.2 数据库表结构



9.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity(name="T")//name是用来在HQL语句中应用的本类的名字
@Table(name="H_TEACHER_")//数据库中当前类对应的表名
@SequenceGenerator(name="Teacher_Gene", sequenceName="H_TEACHER_SEQ", allocationSize=1)
public class Teacher {
private BigDecimal id;
private String name;
private Set<Student> students = new HashSet<Student>();
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="Teacher_Gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany
@JoinTable(
name="H_T_S",//指明中间表的名字
joinColumns={@JoinColumn(name="TEACHER_ID", referencedColumnName="ID")},
//指明中间表参考当前类对应数据库表中的字段ID的外键名为TEACHER_ID
inverseJoinColumns={@JoinColumn(name="STUDENT_ID",referencedColumnName="ID")}
//指明中间表参考另外一张表中的字段ID的外键名为STUDENT_ID
)
public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity(name="S")
@Table(name="H_STUDENT_")
@SequenceGenerator(name="Student_Gene", sequenceName="H_STUDENT_SEQ", allocationSize=1)
public class Student {
private BigDecimal id;
private String name;
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="Student_Gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

9.2 XML方式

9.2.1 类图



9.2.2 数据库表结构



9.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
public class XML_Teacher {
private BigDecimal id;
private String name;
private Set<XML_Student> students = new HashSet<XML_Student>();
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<XML_Student> getStudents() {
return students;
}
public void setStudents(Set<XML_Student> students) {
this.students = students;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
public class XML_Student {
private BigDecimal id;
private String name;
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

9.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Teacher" table="H_TEACHER_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="20" scale="0" />
<generator class="sequence">
<param name="sequence">H_TEACHER_XML_SEQ</param>
</generator>
</id>
<property name="name"/>
<set name="students" table="H_XML_T_S">
<key column="TEACHER_ID"/>
<!--中间表中指向当前类对应表的外键字段名为TEACHER_ID -->
<many-to-many class="XML_Student" column="SUTDNET_ID"/>
<!-- 中间表中指向XML_Student类对应表的外键字段名为STUDENT_ID -->
</set>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Student" table="H_STUDENT_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="21" scale="0" />
<generator class="sequence">
<param name="sequence">H_XML_STUDENT_SEQ</param>
</generator>
</id>
<property name="name"/>
</class>
</hibernate-mapping>

十、多对多双向关联

10.1 Annotation方式

10.1.1 类图



10.1.2 数据库表结构



10.1.3 实体类

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity(name="S")
@Table(name="H_STUDENT_")
@SequenceGenerator(name="Student_Gene", sequenceName="H_STUDENT_SEQ", allocationSize=1)
public class Student {
private BigDecimal id;
private String name;
private Set<Teacher> teachers = new HashSet<Teacher>();
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="Student_Gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany(mappedBy="students")
public Set<Teacher> getTeachers() {
return teachers;
}
public void setTeachers(Set<Teacher> teachers) {
this.teachers = teachers;
}
}

package com.rongqq.hibernate3.annotation.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
@Entity(name="T")
@Table(name="H_TEACHER_")
@SequenceGenerator(name="Teacher_Gene", sequenceName="H_TEACHER_SEQ", allocationSize=1)
public class Teacher {
private BigDecimal id;
private String name;
private Set<Student> students = new HashSet<Student>();
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="Teacher_Gene")
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToMany
@JoinTable(
name="H_T_S",//指明中间表的名字
joinColumns={@JoinColumn(name="TEACHER_ID",
referencedColumnName="ID")},
//指明中间表参考当前类对应数据库表中的字段ID的外键名为TEACHER_ID
inverseJoinColumns={@JoinColumn(name="STUDENT_ID",
referencedColumnName="ID")}
//指明中间表参考另外一张表中的字段ID的外键名为STUDENT_ID
)
public Set<Student> getStudents() {
return students;
}
public void setStudents(Set<Student> students) {
this.students = students;
}
}

10.2 XML方式

10.2.1 类图



10.2.2 数据库表结构



10.2.3 实体类

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
public class XML_Teacher {
private BigDecimal id;
private String name;
private Set<XML_Student> students = new HashSet<XML_Student>();
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<XML_Student> getStudents() {
return students;
}
public void setStudents(Set<XML_Student> students) {
this.students = students;
}
}

package com.rongqq.hibernate3.xml.entity;
import java.math.BigDecimal;
import java.util.HashSet;
import java.util.Set;
public class XML_Student {
private BigDecimal id;
private String name;
private Set<XML_Teacher> teachers = new HashSet<XML_Teacher>();
public BigDecimal getId() {
return id;
}
public void setId(BigDecimal id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<XML_Teacher> getTeachers() {
return teachers;
}
public void setTeachers(Set<XML_Teacher> teachers) {
this.teachers = teachers;
}
}

10.2.4 对象映射文件

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Teacher" table="H_TEACHER_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="20" scale="0" />
<generator class="sequence">
<param name="sequence">H_TEACHER_XML_SEQ</param>
</generator>
</id>
<property name="name"/>
<set name="students" table="H_XML_T_S">
<key column="TEACHER_ID"/>
<!-- 中间表中指向当前类对应表的外键字段名为TEACHER_ID -->
<many-to-many class="XML_Student" column="STUDENT_ID"/>
<!-- 中间表中指向XML_Student类对应表的外键字段名为STUDENT_ID -->
</set>
</class>
</hibernate-mapping>

<?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.rongqq.hibernate3.xml.entity">
<class name="XML_Student" table="H_STUDENT_XML" dynamic-update="true">
<id name="id" type="big_decimal">
<column name="ID" precision="21" scale="0" />
<generator class="sequence">
<param name="sequence">H_XML_STUDENT_SEQ</param>
</generator>
</id>
<property name="name"/>
<set name="teachers" table="H_XML_T_S">
<!-- 相关联的类的映射文件两侧定义的中间表名字必须一致 -->
<key column="STUDENT_ID" />
<!-- 中间表中指向当前类对应表的外键字段名 -->
<many-to-many class="XML_Teacher" column="TEACHER_ID" />
<!-- 中间表中指向与当前类关联的另外一个类所对应表的外键字段名 -->
</set>
</class>
</hibernate-mapping>

参考链接：

http://wenku.baidu.com/link?url=mNEhY-Z75gbW63N71g8S2WI6cI96eG3DC2IuDswSVjA94Y3Tf74_ZJfQUuO_-FtTHDf6QgotdLj9vhGMa1Q0_U5U6ENJFxv-j84WE7XtRda

http://blog.csdn.net/zzjjiandan/article/details/20456495

http://jinnianshilongnian.iteye.com/blog/1522591