Hibernate关系映射

最新推荐文章于 2025-07-28 23:27:29 发布

chenggil10

最新推荐文章于 2025-07-28 23:27:29 发布

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文章标签： hibernate string generator class table user

本文链接：https://blog.youkuaiyun.com/chenggil10/article/details/5912498

本文详细介绍了ORM中各种一对一、一对多及多对多关联映射的实现方式，包括单向与双向关联，并通过XML配置与注解形式展示了具体实例。

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One2One单向关联

One2One双向

One2One单向主键关联（不重要）

One2One单向主键关联Annotation（不重要，bug）

联合主键关联

组合映射(几个类映射一个表）

多对一单向关联

一对多单向映射

一对多，多对一双向

多对多的单向关联

多对多双向

One2One单向关联

1xml表示

<hibernate-mapping> <class name="com.aspn.hibernate.StuIdCard"> <id name="id"> <generator class="native"></generator> </id> <property name="num"/> <many-to-one name="student" column="studentId" unique="true"></many-to-one> </class> </hibernate-mapping>

2Annotaion表示

One2One双向

Annotation

xml

package com.aspn.hibernate; public class Student { private int id; private String name; private int age; private String sex; private boolean good; private StuIdCard stuIdCard; public StuIdCard getSidcard() { return stuIdCard; } public void setSidcard(StuIdCard sidcard) { this.stuIdCard = sidcard; } public boolean isGood() { return good; } public void setGood(boolean good) { this.good = good; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } } package com.aspn.hibernate; public class StuIdCard { private int id; private String num; private Student student; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getNum() { return num; } public void setNum(String num) { this.num = num; } public Student getStudent() { return student; } public void setStudent(Student student) { this.student = student; } }

<?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> <class name="com.aspn.hibernate.Student" dynamic-update="true"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <property name="age" /> <property name="sex" /> <property name="good" type="yes_no"></property> <one-to-one name="stuIdCard" property-ref="student"></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> <class name="com.aspn.hibernate.StuIdCard"> <id name="id"> <generator class="native"></generator> </id> <property name="num"/> <many-to-one name="student" column="studentId" unique="true"></many-to-one> </class> </hibernate-mapping>

One2One单向主键关联（不重要）

<?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> <class name="com.bjsxt.hibernate.StuIdCard"> <id name="id"> <generator class="foreign"> <param name="property">student</param> </generator> </id> <property name="num"/> <one-to-one name="student" 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> <class name="com.bjsxt.hibernate.Student" dynamic-update="true"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <property name="age" /> <property name="sex" /> <property name="good" type="yes_no"></property> </class> </hibernate-mapping>

Annotation（不重要，bug）

package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.PrimaryKeyJoinColumn; @Entity public class Husband { private int id; private String name; private Wife wife; @Id @GeneratedValue public int getId() { return id; } public String getName() { return name; } @OneToOne @PrimaryKeyJoinColumn public Wife getWife() { return wife; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } public void setWife(Wife wife) { this.wife = wife; } } package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Wife { private int id; private String name; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

联合主键关联

Annotation

package com.aspn.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinColumns; import javax.persistence.OneToOne; @Entity public class Husband { private int id; private String name; private Wife wife; @Id @GeneratedValue public int getId() { return id; } public String getName() { return name; } @OneToOne @JoinColumns( //不写这个hibernate自己默认给我们字段的名字 wife_id { @JoinColumn(name="wife___Id",referencedColumnName="id"),//自己能改字段的名字 @JoinColumn(name="wife___Name",referencedColumnName="name")//自己能改字段的名字 } ) public Wife getWife() { return wife; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } public void setWife(Wife wife) { this.wife = wife; } } package com.aspn.hibernate; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; @Entity @IdClass(WifePK.class) //当用用组合键的时候使用下面用 @id来指明组合键 public class Wife { private int id; private String name; @Id public int getId() { return id; } public void setId(int id) { this.id = id; } @Id public String getName() { return name; } public void setName(String name) { this.name = name; } } package com.aspn.hibernate; public class WifePK { private int id; private String name; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

xml方式

。。。

组合映射(几个类映射一个表）

Annotation方式

package com.aspn.hibernate; import javax.persistence.Embedded; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Husband { private int id; private String name; private Wife wife; @Id @GeneratedValue public int getId() { return id; } public String getName() { return name; } @Embedded //这个起到嵌入进来的作用 public Wife getWife() { return wife; } public void setId(int id) { this.id = id; } public void setName(String name) { this.name = name; } public void setWife(Wife wife) { this.wife = wife; } } package com.aspn.hibernate; public class Wife { private String wifeName; private int age; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getWifeName() { return wifeName; } public void setWifeName(String name) { this.wifeName = name; } }

xml

多对一单向关联

Annotation

package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToOne; import javax.persistence.Table; @Entity @Table(name="t_user") public class User { private int id; private String name; private Group group; @ManyToOne public Group getGroup() { return group; } public void setGroup(Group group) { this.group = group; } @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } } package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name="t_group") public class Group { private int id; private String name; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

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> <class name="com.bjsxt.hibernate.User" table="t_user"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <many-to-one name="group" column="groupId" /> </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> <class name="com.bjsxt.hibernate.Group" table="t_group"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> </class> </hibernate-mapping>

一对多单向映射

Annotation

package com.bjsxt.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity @Table(name="t_group") public class Group { private int id; private String name; private Set<User> users = new HashSet<User>(); @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @OneToMany @JoinColumn(name="groupId") public Set<User> getUsers() { return users; } public void setUsers(Set<User> users) { this.users = users; } } package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToOne; import javax.persistence.Table; @Entity @Table(name="t_user") public class User { private int id; private String name; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

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> <class name="com.bjsxt.hibernate.Group" table="t_group"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="users"> <key column="groupId"></key> <one-to-many class="com.bjsxt.hibernate.User"/> </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> <class name="com.bjsxt.hibernate.User" table="t_user"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> </class> </hibernate-mapping>

一对多，多对一双向

Annotation

package com.bjsxt.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity @Table(name="t_group") public class Group { private int id; private String name; private Set<User> users = new HashSet<User>(); @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @OneToMany(mappedBy="group") public Set<User> getUsers() { return users; } public void setUsers(Set<User> users) { this.users = users; } } package com.bjsxt.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToOne; import javax.persistence.Table; @Entity @Table(name="t_user") public class User { private int id; private String name; private Group group; @ManyToOne public Group getGroup() { return group; } public void setGroup(Group group) { this.group = group; } @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

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> <class name="com.bjsxt.hibernate.Group" table="t_group"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="users"> <key column="groupId"></key> <one-to-many class="com.bjsxt.hibernate.User"/> </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> <class name="com.bjsxt.hibernate.User" table="t_user"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <many-to-one name="group" column="groupId"></many-to-one> </class> </hibernate-mapping>

多对多的单向关联

Annocation

package com.aspn.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; @Entity public class Teacher { private int id; private String name; private Set<Student> students = new HashSet<Student>(); @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @ManyToMany @JoinTable(name="t_s", joinColumns={@JoinColumn(name="teacher_id")}, inverseJoinColumns={@JoinColumn(name="student_id")} ) public Set<Student> getStudents() { return students; } public void setStudents(Set<Student> students) { this.students = students; } } package com.aspn.hibernate; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Student { private int id; private String name; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

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> <class name="com.aspn.hibernate.Teacher"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="students" table="t_s"> <key column="teacher_id"></key> <many-to-many class="com.aspn.hibernate.Student" column="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> <class name="com.aspn.hibernate.Student"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> </class> </hibernate-mapping>

多对多双向

Annotation

package com.bjsxt.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.JoinTable; import javax.persistence.ManyToMany; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity public class Teacher { private int id; private String name; private Set<Student> students = new HashSet<Student>(); @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @ManyToMany @JoinTable(name="t_s", joinColumns={@JoinColumn(name="teacher_id")}, inverseJoinColumns={@JoinColumn(name="student_id")} ) public Set<Student> getStudents() { return students; } public void setStudents(Set<Student> students) { this.students = students; } } package com.bjsxt.hibernate; import java.util.HashSet; import java.util.Set; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToMany; @Entity public class Student { private int id; private String name; private Set<Teacher> teachers = new HashSet<Teacher>(); @ManyToMany(mappedBy="students") public Set<Teacher> getTeachers() { return teachers; } public void setTeachers(Set<Teacher> teachers) { this.teachers = teachers; } @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }

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> <class name="com.bjsxt.hibernate.Teacher"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="students" table="t_s"> <key column="teacher_id"></key> <many-to-many class="com.bjsxt.hibernate.Student" column="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> <class name="com.bjsxt.hibernate.Student"> <id name="id"> <generator class="native"></generator> </id> <property name="name"></property> <set name="teachers" table="t_s"> <key column="student_id"></key> <many-to-many class="com.bjsxt.hibernate.Teacher" column="teacher_id"/> </set> </class> </hibernate-mapping>