Hibernate about using join tables to implement a one-to-many association mapping

"Hibernate" about using a join table to implement a one-to-many association mapping

A one-to-many association mapping based on an intermediate table is still more common.
Person (people) and group (group)

Annotations Configuration

@Entity @table (name= "T_group") publicclass Group {    private Integer ID;    private String name;    Private set<person> persons=newhashset<person> ();         @OneToMany    @JoinTable (name= "t_p", joincolumns={@JoinColumn (name= "g_id")},           inversejoincolumns={@ Joincolumn (name= "p_id")}) public    set<person> getpersons () {       returnpersons;    }    Publicvoid setpersons (set<person> persons) {       this.persons = persons;    }    @Id    @GeneratedValue public    Integer getId () {       returnid;    }    Publicvoid setId (Integer id) {       this.id = ID;    }    @Column (name= "G_name") public    String GetName () {       returnname;    }    Publicvoid setName (String name) {       this.name = name;    }}

@Entity @table (name= "P_person") publicclass person {    private Integer ID;    private String name;    Private Integer age;    @Id    @GeneratedValue public    Integer getId () {       returnid;    }    Publicvoid setId (Integer id) {       this.id = ID;    }    @Column (name= "P_name") public    String GetName () {       returnname;    }    Publicvoid setName (String name) {       this.name = name;    }    @Column (name= "p_age") public    Integer Getage () {       returnage;    }    Publicvoid setage (Integer age) {       this.age = age;    }}

XML Configuration

<?xml version= "1.0"? ><! DOCTYPE hibernate-mapping public     "-//hibernate/hibernatemapping DTD 3.0//en"    "http// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">

<?xml version= "1.0"? ><! DOCTYPE hibernate-mapping public     "-//hibernate/hibernatemapping DTD 3.0//en"    "http// Hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">

In a one-to-many intermediate table mapping, Hibernate automatically translates to many-to-many processing!



Hibernate about using join tables to implement a one-to-many association mapping