Hibernate的复合主键,基于属性的复合主键

java 代码

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

// default package



/**
 * User generated by MyEclipse - Hibernate Tools
 */

public class User  implements java.io.Serializable {


    // Fields

  private String addr;
     private String name;
     private String email;


    // Constructors

    /** default constructor */
    public User() {
    }


    /** full constructor */
    public User(String email) {
        this.email = email;
    }


    // Property accessors



    public String getEmail() {
        return this.email;
    }

    public void setEmail(String email) {
        this.email = email;
    }


 public String getAddr() {
  return addr;
 }


 public void setAddr(String addr) {
  this.addr = addr;
 }


 public String getName() {
  return name;
 }


 public void setName(String name) {
  this.name = name;
 }

 public boolean equals(Object other) {
        if ( (this == other ) ) return true;
   if ( (other == null ) ) return false;
   if ( !(other instanceof UserId) ) return false;
   User castOther = ( User ) other;

//   return ( (this.getAddr()==castOther.getAddr()) || ( this.getAddr()!=null && castOther.getAddr()!=null && this.getAddr().equals(castOther.getAddr()) ) )
//             && ( (this.getName()==castOther.getName()) || ( this.getName()!=null && castOther.getName()!=null && this.getName().equals(castOther.getName()) ) )
//             && ( (this.getEmail()==castOther.getEmail()) || ( this.getEmail()!=null && castOther.getEmail()!=null && this.getEmail().equals(castOther.getEmail()) ) );
   return  new EqualsBuilder().append(this.name, castOther.getName())
                              .append(this.addr, castOther.getAddr())
                              .append(this.email, castOther.getEmail()).isEquals();
  }

  public int hashCode() {
        int result = 17;

//        result = 37 * result + ( getAddr() == null ? 0 : this.getAddr().hashCode() );
//        result = 37 * result + ( getName() == null ? 0 : this.getName().hashCode() );
//        result = 37 * result + ( getEmail() == null ? 0 : this.getEmail().hashCode() );
        return new HashCodeBuilder().append(this.getName()).append(this.getAddr()).append(this.getEmail()).toHashCode();
  }

}

 

xml 代码

<hibernate-mapping>
    <class name="User" table="user" catalog="tie">
        <composite-id >
            <key-property name="addr" type="string">
                <column name="addr" length="45" />
            key-property>
            <key-property name="name" type="string">
                <column name="name" length="45" />
            key-property>
        composite-id>
        <property name="email" type="string">
            <column name="email" length="45" />
        property>
    class>
hibernate-mapping>

 

  测试下

java 代码

public void testCase(){

        User user = new User();
        user.setName("mamamm");
        user.setAddr("china beijiing");
        user.setEmail("[email protected]");

        Session session = factory.openSession();
        Transaction tr = session.beginTransaction();
        session.save(user);
        tr.commit();
        session.close();
    }

    public void testRetrieve(){

        User user = new User();
        user.setName("mamamm");
        user.setAddr("china beijiing");

        Session session = factory.openSession();
        user = (User)session.load(User.class, user);
        System.out.println(user.getEmail());
        session.close();
    }

 

这里重写equals和hascode方法的时候 ,采用了一个第3方的common-lang包.