hibernate多对多形式（User类<---->Educate类）

1.基于注解的形式：

User类：

  1. package com.ssh.entities;
  2.  
  3. import java.util.Date;
  4. import java.util.HashSet;
  5. import java.util.Set;
  6.  
  7. import javax.persistence.CascadeType;
  8. import javax.persistence.Column;
  9. import javax.persistence.Entity;
  10. import javax.persistence.FetchType;
  11. import javax.persistence.GeneratedValue;
  12. import javax.persistence.Id;
  13. import javax.persistence.JoinColumn;
  14. import javax.persistence.JoinTable;
  15. import javax.persistence.ManyToMany;
  16. import javax.persistence.Table;
  17.  
  18. @Entity
  19. @Table(name="user")
  20. public class User {
  21.     @Id
  22.     @Column(name="id")
  23.     @GeneratedValue
  24.     private Long id;//员工编号
  25.  
  26.     @Column(name="name")
  27.     private String name;//员工用户名
  28.  
  29.     @Column(name="password")
  30.     private String password;//登录密码
  31.  
  32.     @Column(name="sex")
  33.     private Byte sex;//性别
  34.  
  35.     @Column(name="birthday")
  36.     private Date birthday;//生日
  37.  
  38.     @Column(name="createtime")
  39.     private Date createtime;//创建时间
  40.  
  41.     @Column(name="isadmin")
  42.     private Byte isadmin;//是否为管理员
  43.  
  44.     @Column(name="content")
  45.     private String content;//人员简介
  46.  
  47.     @ManyToMany(targetEntity=com.ssh.entities.Educate.class,cascade=CascadeType.ALL,
  48.             fetch=FetchType.EAGER)
  49.     @JoinTable(
  50.             name="user_educate",
  51.             joinColumns={@JoinColumn(name="user_id")},
  52.             inverseJoinColumns={@JoinColumn(name="educate_id")}
  53.             )
  54.     private Set<Educate> educate=new HashSet<Educate>();
  55.     public Set<Educate> getEducate() {
  56.         return educate;
  57.     }
  58.     public void setEducate(Set<Educate> educate) {
  59.         this.educate = educate;
  60.     }
  61.     public Long getId() {
  62.         return id;
  63.     }
  64.     public void setId(Long id) {
  65.         this.id = id;
  66.     }
  67.     public String getName() {
  68.         return name;
  69.     }
  70.     public void setName(String name) {
  71.         this.name = name;
  72.     }
  73.     public String getPassword() {
  74.         return password;
  75.     }
  76.     public void setPassword(String password) {
  77.         this.password = password;
  78.     }
  79.     public Byte getSex() {
  80.         return sex;
  81.     }
  82.     public void setSex(Byte sex) {
  83.         this.sex = sex;
  84.     }
  85.     public Date getBirthday() {
  86.         return birthday;
  87.     }
  88.     public void setBirthday(Date birthday) {
  89.         this.birthday = birthday;
  90.     }
  91.     public Date getCreatetime() {
  92.         return createtime;
  93.     }
  94.     public void setCreatetime(Date createtime) {
  95.         this.createtime = createtime;
  96.     }
  97.     public Byte getIsadmin() {
  98.         return isadmin;
  99.     }
  100.     public void setIsadmin(Byte isadmin) {
  101.         this.isadmin = isadmin;
  102.     }
  103.     public String getContent() {
  104.         return content;
  105.     }
  106.     public void setContent(String content) {
  107.         this.content = content;
  108.     }
  109.     public User(Long id, String name, String password, Byte sex, Date birthday,
  110.             Date createtime, Byte isadmin, String content) {
  111.         this.id = id;
  112.         this.name = name;
  113.         this.password = password;
  114.         this.sex = sex;
  115.         this.birthday = birthday;
  116.         this.createtime = createtime;
  117.         this.isadmin = isadmin;
  118.         this.content = content;
  119.     }
  120.     public User() {
  121.     }
  122.     @Override
  123.     public String toString() {
  124.         return "User [id=" + id + ", name=" + name + ", password=" + password
  125.                 + ", sex=" + sex + ", birthday=" + birthday + ", createtime="
  126.                 + createtime + ", isadmin=" + isadmin + ", content=" + content
  127.                 + "]";
  128.     }
  129.     @Override
  130.     public int hashCode() {
  131.         final int prime = 31;
  132.         int result = 1;
  133.         result = prime * result + ((id == null) ? 0 : id.hashCode());
  134.         return result;
  135.     }
  136.     @Override
  137.     public boolean equals(Object obj) {
  138.         if (this == obj)
  139.             return true;
  140.         if (obj == null)
  141.             return false;
  142.         if (getClass() != obj.getClass())
  143.             return false;
  144.         User other = (User) obj;
  145.         if (id == null) {
  146.             if (other.id != null)
  147.                 return false;
  148.         } else if (!id.equals(other.id))
  149.             return false;
  150.         return true;
  151.     }
  152.  
  153. }

Educate类：

  1. package com.ssh.entities;
  2.  
  3. import java.util.Date;
  4. import java.util.HashSet;
  5. import java.util.Set;
  6.  
  7. import javax.persistence.CascadeType;
  8. import javax.persistence.Column;
  9. import javax.persistence.Entity;
  10. import javax.persistence.FetchType;
  11. import javax.persistence.GeneratedValue;
  12. import javax.persistence.GenerationType;
  13. import javax.persistence.Id;
  14. import javax.persistence.ManyToMany;
  15. import javax.persistence.Table;
  16.  
  17. @Entity
  18. @Table(name="educate")
  19. public class Educate {
  20.     @Id
  21.     @Column(name="id")
  22.     @GeneratedValue(strategy=GenerationType.AUTO)
  23.     private Long id;//培训标号
  24.  
  25.     @Column(name="name")
  26.     private String name;//培训名称
  27.  
  28.     @Column(name="purpose")
  29.     private String purpose;//培训目的
  30.  
  31.     @Column(name="begintime")
  32.     private Date begintime;//培训开始时间
  33.  
  34.     @Column(name="endtime")
  35.     private Date endtime;//培训结束时间
  36.  
  37.     @Column(name="datum")
  38.     private String datum;//培训材料
  39.  
  40.     @Column(name="teacher")
  41.     private String teacher;//培训讲师
  42.  
  43.     @Column(name="student")
  44.     private String student;//培训人员
  45.  
  46.     @Column(name="createtime")
  47.     private Date createtime;//创建时间
  48.  
  49.     @Column(name="educate")
  50.     private Byte educate;//培训是否完成
  51.  
  52.     @Column(name="effect")
  53.     private String effect;//培训效果
  54.  
  55.     @Column(name="summarize")
  56.     private String summarize;//培训总结
  57.  
  58.     @ManyToMany(mappedBy="educate",cascade=CascadeType.ALL,fetch=FetchType.LAZY)
  59.     private Set<User> user=new HashSet<User>();
  60.  
  61.     public Set<User> getUser() {
  62.         return user;
  63.     }
  64.     public void setUser(Set<User> user) {
  65.         this.user = user;
  66.     }
  67.     public Long getId() {
  68.         return id;
  69.     }
  70.     public void setId(Long id) {
  71.         this.id = id;
  72.     }
  73.     public String getName() {
  74.         return name;
  75.     }
  76.     public void setName(String name) {
  77.         this.name = name;
  78.     }
  79.     public String getPurpose() {
  80.         return purpose;
  81.     }
  82.     public void setPurpose(String purpose) {
  83.         this.purpose = purpose;
  84.     }
  85.     public Date getBegintime() {
  86.         return begintime;
  87.     }
  88.     public void setBegintime(Date begintime) {
  89.         this.begintime = begintime;
  90.     }
  91.     public Date getEndtime() {
  92.         return endtime;
  93.     }
  94.     public void setEndtime(Date endtime) {
  95.         this.endtime = endtime;
  96.     }
  97.     public String getDatum() {
  98.         return datum;
  99.     }
  100.     public void setDatum(String datum) {
  101.         this.datum = datum;
  102.     }
  103.     public String getTeacher() {
  104.         return teacher;
  105.     }
  106.     public void setTeacher(String teacher) {
  107.         this.teacher = teacher;
  108.     }
  109.     public String getStudent() {
  110.         return student;
  111.     }
  112.     public void setStudent(String student) {
  113.         this.student = student;
  114.     }
  115.     public Date getCreatetime() {
  116.         return createtime;
  117.     }
  118.     public void setCreatetime(Date createtime) {
  119.         this.createtime = createtime;
  120.     }
  121.     public Byte getEducate() {
  122.         return educate;
  123.     }
  124.     public void setEducate(Byte educate) {
  125.         this.educate = educate;
  126.     }
  127.     public String getEffect() {
  128.         return effect;
  129.     }
  130.     public void setEffect(String effect) {
  131.         this.effect = effect;
  132.     }
  133.     public String getSummarize() {
  134.         return summarize;
  135.     }
  136.     public void setSummarize(String summarize) {
  137.         this.summarize = summarize;
  138.     }
  139.     public Educate(Long id, String name, String purpose, Date begintime,
  140.             Date endtime, String datum, String teacher, String student,
  141.             Date createtime, Byte educate, String effect, String summarize) {
  142.         this.id = id;
  143.         this.name = name;
  144.         this.purpose = purpose;
  145.         this.begintime = begintime;
  146.         this.endtime = endtime;
  147.         this.datum = datum;
  148.         this.teacher = teacher;
  149.         this.student = student;
  150.         this.createtime = createtime;
  151.         this.educate = educate;
  152.         this.effect = effect;
  153.         this.summarize = summarize;
  154.     }
  155.     public Educate() {
  156.     }
  157.     @Override
  158.     public String toString() {
  159.         return "Educate [id=" + id + ", name=" + name + ", purpose=" + purpose
  160.                 + ", begintime=" + begintime + ", endtime=" + endtime
  161.                 + ", datum=" + datum + ", teacher=" + teacher + ", student="
  162.                 + student + ", createtime=" + createtime + ", educate="
  163.                 + educate + ", effect=" + effect + ", summarize=" + summarize
  164.                 + "]";
  165.     }
  166.     @Override
  167.     public int hashCode() {
  168.         final int prime = 31;
  169.         int result = 1;
  170.         result = prime * result + ((id == null) ? 0 : id.hashCode());
  171.         return result;
  172.     }
  173.     @Override
  174.     public boolean equals(Object obj) {
  175.         if (this == obj)
  176.             return true;
  177.         if (obj == null)
  178.             return false;
  179.         if (getClass() != obj.getClass())
  180.             return false;
  181.         Educate other = (Educate) obj;
  182.         if (id == null) {
  183.             if (other.id != null)
  184.                 return false;
  185.         } else if (!id.equals(other.id))
  186.             return false;
  187.         return true;
  188.     }
  189.  
  190. }

需要注意的是，如果是通过spring管理的话，需要在applicationContext.xml文件中的<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">中，配置

<property name="packagesToScan" value="com.ssh.entities"></property>

2.基于配置文件的形式：

需要注意的是，如果是通过spring管理的话，需要在applicationContext.xml文件中的<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">中，配置

<property name="mappingLocations" value="classpath:com/ssh/entities/*.hbm.xml"></property>

User类：

  1. package com.ssh.entities;
  2.  
  3. import java.io.Serializable;
  4. import java.util.Date;
  5. import java.util.HashSet;
  6. import java.util.Set;
  7.  
  8. public class User {
  9.     private Long id;//员工编号
  10.     private String name;//员工用户名
  11.     private String password;//登录密码
  12.     private Byte sex;//性别
  13.     private Date birthday;//生日
  14.     private Date createtime;//创建时间
  15.     private Byte isadmin;//是否为管理员
  16.     private String content;//人员简介
  17.     private Set<Educate> educate=new HashSet<Educate>();
  18.     public Set<Educate> getEducate() {
  19.         return educate;
  20.     }
  21.     public void setEducate(Set<Educate> educate) {
  22.         this.educate = educate;
  23.     }
  24.     public Long getId() {
  25.         return id;
  26.     }
  27.     public void setId(Long id) {
  28.         this.id = id;
  29.     }
  30.     public String getName() {
  31.         return name;
  32.     }
  33.     public void setName(String name) {
  34.         this.name = name;
  35.     }
  36.     public String getPassword() {
  37.         return password;
  38.     }
  39.     public void setPassword(String password) {
  40.         this.password = password;
  41.     }
  42.     public Byte getSex() {
  43.         return sex;
  44.     }
  45.     public void setSex(Byte sex) {
  46.         this.sex = sex;
  47.     }
  48.     public Date getBirthday() {
  49.         return birthday;
  50.     }
  51.     public void setBirthday(Date birthday) {
  52.         this.birthday = birthday;
  53.     }
  54.     public Date getCreatetime() {
  55.         return createtime;
  56.     }
  57.     public void setCreatetime(Date createtime) {
  58.         this.createtime = createtime;
  59.     }
  60.     public Byte getIsadmin() {
  61.         return isadmin;
  62.     }
  63.     public void setIsadmin(Byte isadmin) {
  64.         this.isadmin = isadmin;
  65.     }
  66.     public String getContent() {
  67.         return content;
  68.     }
  69.     public void setContent(String content) {
  70.         this.content = content;
  71.     }
  72.     public User(Long id, String name, String password, Byte sex, Date birthday,
  73.             Date createtime, Byte isadmin, String content) {
  74.         this.id = id;
  75.         this.name = name;
  76.         this.password = password;
  77.         this.sex = sex;
  78.         this.birthday = birthday;
  79.         this.createtime = createtime;
  80.         this.isadmin = isadmin;
  81.         this.content = content;
  82.     }
  83.     public User() {
  84.     }
  85.     @Override
  86.     public String toString() {
  87.         return "User [id=" + id + ", name=" + name + ", password=" + password
  88.                 + ", sex=" + sex + ", birthday=" + birthday + ", createtime="
  89.                 + createtime + ", isadmin=" + isadmin + ", content=" + content
  90.                 + "]";
  91.     }
  92.     @Override
  93.     public int hashCode() {
  94.         final int prime = 31;
  95.         int result = 1;
  96.         result = prime * result + ((id == null) ? 0 : id.hashCode());
  97.         return result;
  98.     }
  99.     @Override
  100.     public boolean equals(Object obj) {
  101.         if (this == obj)
  102.             return true;
  103.         if (obj == null)
  104.             return false;
  105.         if (getClass() != obj.getClass())
  106.             return false;
  107.         User other = (User) obj;
  108.         if (id == null) {
  109.             if (other.id != null)
  110.                 return false;
  111.         } else if (!id.equals(other.id))
  112.             return false;
  113.         return true;
  114.     }
  115.  
  116. }

Educate类：

  1. package com.ssh.entities;
  2.  
  3. import java.io.Serializable;
  4. import java.util.Date;
  5. import java.util.HashSet;
  6. import java.util.Set;
  7.  
  8. public class Educate {
  9.     private Long id;//培训标号
  10.     private String name;//培训名称
  11.     private String purpose;//培训目的
  12.     private Date begintime;//培训开始时间
  13.     private Date endtime;//培训结束时间
  14.     private String datum;//培训材料
  15.     private String teacher;//培训讲师
  16.     private String student;//培训人员
  17.     private Date createtime;//创建时间
  18.     private Byte educate;//培训是否完成
  19.     private String effect;//培训效果
  20.     private String summarize;//培训总结
  21.     private Set<User> user=new HashSet<User>();
  22.  
  23.     public Set<User> getUser() {
  24.         return user;
  25.     }
  26.     public void setUser(Set<User> user) {
  27.         this.user = user;
  28.     }
  29.     public Long getId() {
  30.         return id;
  31.     }
  32.     public void setId(Long id) {
  33.         this.id = id;
  34.     }
  35.     public String getName() {
  36.         return name;
  37.     }
  38.     public void setName(String name) {
  39.         this.name = name;
  40.     }
  41.     public String getPurpose() {
  42.         return purpose;
  43.     }
  44.     public void setPurpose(String purpose) {
  45.         this.purpose = purpose;
  46.     }
  47.     public Date getBegintime() {
  48.         return begintime;
  49.     }
  50.     public void setBegintime(Date begintime) {
  51.         this.begintime = begintime;
  52.     }
  53.     public Date getEndtime() {
  54.         return endtime;
  55.     }
  56.     public void setEndtime(Date endtime) {
  57.         this.endtime = endtime;
  58.     }
  59.     public String getDatum() {
  60.         return datum;
  61.     }
  62.     public void setDatum(String datum) {
  63.         this.datum = datum;
  64.     }
  65.     public String getTeacher() {
  66.         return teacher;
  67.     }
  68.     public void setTeacher(String teacher) {
  69.         this.teacher = teacher;
  70.     }
  71.     public String getStudent() {
  72.         return student;
  73.     }
  74.     public void setStudent(String student) {
  75.         this.student = student;
  76.     }
  77.     public Date getCreatetime() {
  78.         return createtime;
  79.     }
  80.     public void setCreatetime(Date createtime) {
  81.         this.createtime = createtime;
  82.     }
  83.     public Byte getEducate() {
  84.         return educate;
  85.     }
  86.     public void setEducate(Byte educate) {
  87.         this.educate = educate;
  88.     }
  89.     public String getEffect() {
  90.         return effect;
  91.     }
  92.     public void setEffect(String effect) {
  93.         this.effect = effect;
  94.     }
  95.     public String getSummarize() {
  96.         return summarize;
  97.     }
  98.     public void setSummarize(String summarize) {
  99.         this.summarize = summarize;
  100.     }
  101.     public Educate(Long id, String name, String purpose, Date begintime,
  102.             Date endtime, String datum, String teacher, String student,
  103.             Date createtime, Byte educate, String effect, String summarize) {
  104.         this.id = id;
  105.         this.name = name;
  106.         this.purpose = purpose;
  107.         this.begintime = begintime;
  108.         this.endtime = endtime;
  109.         this.datum = datum;
  110.         this.teacher = teacher;
  111.         this.student = student;
  112.         this.createtime = createtime;
  113.         this.educate = educate;
  114.         this.effect = effect;
  115.         this.summarize = summarize;
  116.     }
  117.     public Educate() {
  118.     }
  119.     @Override
  120.     public String toString() {
  121.         return "Educate [id=" + id + ", name=" + name + ", purpose=" + purpose
  122.                 + ", begintime=" + begintime + ", endtime=" + endtime
  123.                 + ", datum=" + datum + ", teacher=" + teacher + ", student="
  124.                 + student + ", createtime=" + createtime + ", educate="
  125.                 + educate + ", effect=" + effect + ", summarize=" + summarize
  126.                 + "]";
  127.     }
  128.     @Override
  129.     public int hashCode() {
  130.         final int prime = 31;
  131.         int result = 1;
  132.         result = prime * result + ((id == null) ? 0 : id.hashCode());
  133.         return result;
  134.     }
  135.     @Override
  136.     public boolean equals(Object obj) {
  137.         if (this == obj)
  138.             return true;
  139.         if (obj == null)
  140.             return false;
  141.         if (getClass() != obj.getClass())
  142.             return false;
  143.         Educate other = (Educate) obj;
  144.         if (id == null) {
  145.             if (other.id != null)
  146.                 return false;
  147.         } else if (!id.equals(other.id))
  148.             return false;
  149.         return true;
  150.     }
  151.  
  152. }

User.hbm.xml

  1. <?xml version="1.0"?>
  2. <!DOCTYPE hibernate-mapping PUBLIC
  3. "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
  4. "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
  5. <hibernate-mapping>
  6.     <class name="com.ssh.entities.User" table="user">
  7.         <id column="id" name="id" type="java.lang.Long">
  8.             <generator class="native"></generator>
  9.         </id>
  10.         <property name="name" length="50" type="java.lang.String"/>
  11.         <property name="password" length="50" type="java.lang.String"/>
  12.         <property name="sex" length="4" type="java.lang.Byte"/>
  13.         <property name="birthday" length="23" type="java.util.Date"/>
  14.         <property name="createtime" length="23"  type="java.util.Date"/>
  15.         <property name="isadmin" length="4" type="java.lang.Byte"/>
  16.         <property name="content" length="2000" type="java.lang.String"/>
  17.         <set name="educate" table="user_educate" lazy="false" cascade="all" inverse="false">
  18.             <key column="user_id"></key>
  19.             <many-to-many class="com.ssh.entities.Educate" column="educate_id"></many-to-many>
  20.         </set>
  21.     </class>
  22. </hibernate-mapping>

Educate.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>
<class name="com.ssh.entities.Educate" table="educate">
<id column="id" name="id" type="java.lang.Long">
<generator class="native"></generator>
</id>
<property name="name" length="100" type="java.lang.String"></property>
<property name="purpose" length="500" type="java.lang.String"/>
<property name="begintime" length="23" type="java.util.Date"/>
<property name="endtime" length="23" type="java.util.Date"/>
<property name="datum" length="2000" type="java.lang.String"/>
<property name="teacher" length="50" type="java.lang.String"/>
<property name="student" length="50" type="java.lang.String"/>
<property name="createtime" length="23" type="java.util.Date"/>
<property name="effect" length="500" type="java.lang.String"/>
<property name="educate" length="1" type="java.lang.Byte"/>
<property name="summarize" length="2000" type="java.lang.String"/>
<set name="user" table="user_educate" lazy="true" cascade="all" inverse="true">
<key column="educate_id"></key>
<many-to-many class="com.ssh.entities.User" column="user_id"></many-to-many>
</set>
</class>
</hibernate-mapping>

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