Hibernate One-to-many (cascade Relationship)

Hibernate Core configuration file

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE hibernate-configuration Public "-//hibernate/hibernate configuration DTD 3.0//en" "http://www.hi Bernate.org/dtd/hibernate-configuration-3.0.dtd ">        <hibernate-configuration>        <session-factory>        <!--DataSource Configuration -        < propertyname= "connection.driver_class">Com.mysql.jdbc.Driver</ property>        < propertyname= "connection.url">Jdbc:mysql://localhost:3306/test</ property>        < propertyname= "connection.username">Root</ property>        < propertyname= "connection.password"></ property>                <!--specify the SQL dialect used to connect to the database -        < propertyname= "dialect">Org.hibernate.dialect.MySQLDialect</ property>        <!--whether the console outputs SQL statements -        < propertyname= "show_sql">True</ property>        <!--SQL output statements for Hibernate -        < propertyname= "hibernate.format_sql">True</ property>        <!--Specifies whether the program automatically creates tables in the database -        < propertyname= "hbm2ddl.auto">Update</ property>        <!--specify the path to the mapping file -        <MappingResource= "zr/com/pojo/teamclass.hbm.xml"/>        <MappingResource= "zr/com/pojo/student.hbm.xml"/>    </session-factory></hibernate-configuration>

Mapping relationships for entity classes

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "http://www.hibernate.org/ Dtd/hibernate-mapping-3.0.dtd "><hibernate-mapping package= "zr.com.pojo">    <!--Configure mapping Relationships -    <classname= "teamclass"Table= "team_class">        <!--Configure the properties of the primary key and the corresponding primary key -        <IDname= "classID"column= "class_id">            <Generatorclass= "native"/>        </ID>        <!--columns for configuration properties and relative data -        < propertyname= "lfname"column= "class_name"/>        <!--set cascade= "all" cascade relationship inverse= "true" Discard management foreign key -        <Setname= "students"Table= "student"Cascade= "all"Inverse= "true">            <!--FOREIGN Key -            <Keycolumn= "class_id"/>            <!--one -to-many -            <One-to-manyclass= "zr.com.pojo.Student"/>        </Set>    </class></hibernate-mapping>     

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "http://www.hibernate.org /dtd/hibernate-mapping-3.0.dtd "> <hibernate-mapping>          <!--Mapping Relationships -     <classname= "zr.com.pojo.Student"Table= "student">         <IDname= "id"column= "stu_id">             <!--how to generate a primary key ID -            <Generatorclass= "native"/>         </ID>         < propertyname= "name"column= "stu_name"/>         <!--<property name= "classId" column= "class_id"/> -                  <Many-to-onename= "teamclass"class= "zr.com.pojo.TeamClass"column= "class_id"Cascade= "all"/>              </class></hibernate-mapping>

 package zr.com.pojo;public class Student {private int id;        Private String name;    Private Teamclass teamclass;    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 teamclass Getteamclass () {return teamclass;    } public void Setteamclass (teamclass Teamclass) {this.teamclass = teamclass;    } public Student () {super ();        } public Student (int id, String name, teamclass teamclass) {super ();        This.id = id;        THIS.name = name;    This.teamclass = teamclass;                } @Override public String toString () {return "Student [id=" + ID + ", name=" + name + ", teamclass="    + Teamclass + "]"; }                        }

package zr.com.pojo;import Java.util.hashset;import java.util.set;public class teamclass {private int classID;        Private String lfname; Private Set<Student>Students = new HashSet<Student>();    public int GetClassID () {return classID;    } public void Setclassid (int classID) {this.classid = classID;    } public String getlfname () {return lfname;    } public void Setlfname (String Lfname) {this.lfname = lfname; } public Set<Student>getstudents () {return students; } public void Setstudents (Set<Student>Students)    {this.students = students;    } public teamclass () {super (); } public teamclass (int classID, String lfname, Set<Student>Students)        {super ();        This.classid = classID;        This.lfname = lfname;    This.students = students;                } @Override public String toString () {return "teamclass [classid=" + ClassID + ", lfname=" + lfname    + ", students=" + students + "]"; }}

 packagezr.com.test;Importjava.util.List;Importjava.util.UUID;Importorg.hibernate.Criteria;Importorg.hibernate.Session;Importorg.hibernate.SessionFactory;Importorg.hibernate.cfg.Configuration;Importorg.hibernate.service.ServiceRegistry;Importorg.hibernate.service.ServiceRegistryBuilder;Importzr.com.pojo.Student;Importzr.com.pojo.TeamClass; public classTestClass { public Static voidmain (string[] Args) {//creating a Configuration objectConfiguration Configuration =NewConfiguration (). Configure ("hibernate.cfg.xml"); //Create a Serviceregistry objectServiceregistry Serviceregistry =Newserviceregistrybuilder (). applysettings (configuration.getproperties ()). buildserviceregistry (); //Create a Sessionfactory objectSessionfactory sessionfactory =configuration.buildsessionfactory (serviceregistry); //Create Session ObjectSession session =sessionfactory.opensession (); //Open Transactionsession.begintransaction (); //Create an entity classStudent student1=NewStudent (); Student1.setname ("lf"); Student Student2=NewStudent (); Student2.setname ("gl"); Teamclass Teamclass=NewTeamclass (); Teamclass.setlfname ("java");        Teamclass.getstudents (). Add (student1);        Teamclass.getstudents (). Add (student2); //Inserting DataSession.save (teamclass); //Commit a transactionsession.gettransaction (). Commit (); }}

Hibernate One-to-many (cascade Relationship)