Java/Hibernate/Relation One to Many
Содержание
Mapping One To Many Set
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception { HibernateUtil.setup("create table HighScores (id int,name varchar);"); HibernateUtil.setup("create table gamescores (id int,name varchar,score int,parent_id int);"); Session session = HibernateUtil.currentSession(); HighScores sp = new HighScores("HighScores Name"); HashSet set = new HashSet(); set.add(new GameScore("GameScore Name 1", 3)); set.add(new GameScore("GameScore Name 2", 2)); sp.setGames(set); session.save(sp); session.flush(); session.close(); HibernateUtil.checkData("select * from HighScores"); HibernateUtil.checkData("select * from gamescores"); }
}
/////////////////////////////////////////////////////////////////////////
public class GameScore {
private int id; private String name; private int score; public GameScore() { } public GameScore(String name, int score) { this.name = name; this.score = score; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String s) { name = s; } public String getName() { return name; } public void setScore(int i) { score = i; } public int getScore() { return score; } public boolean equals(Object obj) { if (obj == null) return false; if (!this.getClass().equals(obj.getClass())) return false; GameScore obj2 = (GameScore)obj; if ((this.id == obj2.getId()) && (this.name.equals(obj2.getName())) && (this.score == obj2.getScore()) ) { return true; } return false; } public int hashCode() { int tmp = 0; tmp = (id + name + score).hashCode(); return tmp; }
}
///////////////////////////////////////////////////////////////////////// import java.util.*; public class HighScores {
private int id; private String name; private Set games; public HighScores() { } public HighScores(String name) { this.name = name; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String n) { name = n; } public String getName() { return name; } public void setGames(Set games) { this.games = games; } public Set getGames() { return games; }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="HighScores" table="highscores"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <set name="games" cascade="all"> <key column="parent_id"/> <one-to-many class="GameScore"/> </set> <property name="name" type="string"/> </class> <class name="GameScore" table="gamescores"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <property name="name"/> <property name="score"/> </class>
</hibernate-mapping>
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="HighScores.hbm.xml"/> </session-factory>
</hibernate-configuration>
///////////////////////////////////////////////////////////////////////// import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil {
public static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernate.cfg.xml sessionFactory = new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static final ThreadLocal session = new ThreadLocal(); public static Session currentSession() throws HibernateException { Session s = (Session) session.get(); // Open a new Session, if this thread has none yet if (s == null) { s = sessionFactory.openSession(); // Store it in the ThreadLocal variable session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = (Session) session.get(); if (s != null) s.close(); session.set(null); } static Connection conn; static Statement st; public static void setup(String sql) { try { // Step 1: Load the JDBC driver. Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); // Step 2: Establish the connection to the database. String url = "jdbc:hsqldb:data/tutorial"; conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); st.executeUpdate(sql); } catch (Exception e) { System.err.println("Got an exception! "); e.printStackTrace(); System.exit(0); } } public static void checkData(String sql) { try { HibernateUtil.outputResultSet(st .executeQuery(sql));
// conn.close();
} catch (Exception e) { e.printStackTrace(); } } public static void outputResultSet(ResultSet rs) throws Exception{ ResultSetMetaData metadata = rs.getMetaData(); int numcols = metadata.getColumnCount(); String[] labels = new String[numcols]; int[] colwidths = new int[numcols]; int[] colpos = new int[numcols]; int linewidth; for (int i = 0; i < numcols; i++) { labels[i] = metadata.getColumnLabel(i + 1); // get its label System.out.print(labels[i]+" "); } System.out.println("------------------------"); while (rs.next()) { for (int i = 0; i < numcols; i++) { Object value = rs.getObject(i + 1); if(value == null){ System.out.print(" "); }else{ System.out.print(value.toString().trim()+" "); } } System.out.println(" "); } }
}
</source>
One To Many Bidirectional Map
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception { HibernateUtil.setup("create table grouptable (id int,name varchar);"); HibernateUtil.setup("create table story (id int,info varchar,idx int,parent_id int);"); Session session = HibernateUtil.currentSession(); Group sp = new Group("Group Name"); HashSet set = new HashSet(); Story s = new Story("A Story"); s.setParent(sp); set.add(s); sp.setStories(set); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(sp); transaction.rumit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); throw e; } } finally { session.close(); } HibernateUtil.checkData("select * from grouptable"); HibernateUtil.checkData("select * from story"); }
}
/////////////////////////////////////////////////////////////////////////
import java.util.*;
public class Group {
private int id; private String name; private Set stories; public Group(){ } public Group(String name) { this.name = name; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String n) { name = n; } public String getName() { return name; } public void setStories(Set l) { stories = l; } public Set getStories() { return stories; }
}
///////////////////////////////////////////////////////////////////////// import java.util.*; public class Story {
private int id; private String info; private Group parent; public void setParent(Group g) { parent = g; } public Group getParent() { return parent; } public Story(){ } public Story(String info) { this.info = info; } public void setId(int i) { id = i; } public int getId() { return id; } public void setInfo(String n) { info = n; } public String getInfo() { return info; }
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Group" table="grouptable"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <set name="stories" cascade="all" inverse="true"> <key column="parent_id"/> <one-to-many class="Story"/> </set> <property name="name" type="string"/> </class> <class name="Story" table="story"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <property name="info"/> <many-to-one name="parent" column="parent_id" not-null="true"/> </class>
</hibernate-mapping>
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="Group.hbm.xml"/> </session-factory>
</hibernate-configuration>
///////////////////////////////////////////////////////////////////////// import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil {
public static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernate.cfg.xml sessionFactory = new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static final ThreadLocal session = new ThreadLocal(); public static Session currentSession() throws HibernateException { Session s = (Session) session.get(); // Open a new Session, if this thread has none yet if (s == null) { s = sessionFactory.openSession(); // Store it in the ThreadLocal variable session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = (Session) session.get(); if (s != null) s.close(); session.set(null); } static Connection conn; static Statement st; public static void setup(String sql) { try { // Step 1: Load the JDBC driver. Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); // Step 2: Establish the connection to the database. String url = "jdbc:hsqldb:data/tutorial"; conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); st.executeUpdate(sql); } catch (Exception e) { System.err.println("Got an exception! "); e.printStackTrace(); System.exit(0); } } public static void checkData(String sql) { try { HibernateUtil.outputResultSet(st .executeQuery(sql));
// conn.close();
} catch (Exception e) { e.printStackTrace(); } } public static void outputResultSet(ResultSet rs) throws Exception{ ResultSetMetaData metadata = rs.getMetaData(); int numcols = metadata.getColumnCount(); String[] labels = new String[numcols]; int[] colwidths = new int[numcols]; int[] colpos = new int[numcols]; int linewidth; for (int i = 0; i < numcols; i++) { labels[i] = metadata.getColumnLabel(i + 1); // get its label System.out.print(labels[i]+" "); } System.out.println("------------------------"); while (rs.next()) { for (int i = 0; i < numcols; i++) { Object value = rs.getObject(i + 1); if(value == null){ System.out.print(" "); }else{ System.out.print(value.toString().trim()+" "); } } System.out.println(" "); } }
}
</source>
One To Many Mapping based on Array
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception { HibernateUtil.setup("create table grouptable (id int,name varchar);"); HibernateUtil.setup("create table story (id int,info varchar,idx int,parent_id int);"); Session session = HibernateUtil.currentSession(); Group sp = new Group("Group Name"); sp.setStories(new Story[]{new Story("Story Name 1"), new Story("Story Name 2")}); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(sp); transaction.rumit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); throw e; } } finally { session.close(); } HibernateUtil.checkData("select * from grouptable"); HibernateUtil.checkData("select * from story"); }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Group" table="grouptable"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <array name="stories" cascade="all"> <key column="parent_id"/> <index column="idx"/> <one-to-many class="Story"/> </array> <property name="name" type="string"/> </class> <class name="Story" table="story"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <property name="info"/> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
import java.util.*;
public class Group {
private int id; private String name; private Story[] stories; public Group(){ } public Group(String name) { this.name = name; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String n) { name = n; } public String getName() { return name; } public void setStories(Story[] l) { stories = l; } public Story[] getStories() { return stories; }
}
///////////////////////////////////////////////////////////////////////// import java.util.*; public class Story {
private int id; private String info; public Story(){ } public Story(String info) { this.info = info; } public void setId(int i) { id = i; } public int getId() { return id; } public void setInfo(String n) { info = n; } public String getInfo() { return info; }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="Group.hbm.xml"/> </session-factory>
</hibernate-configuration>
///////////////////////////////////////////////////////////////////////// import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil {
public static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernate.cfg.xml sessionFactory = new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static final ThreadLocal session = new ThreadLocal(); public static Session currentSession() throws HibernateException { Session s = (Session) session.get(); // Open a new Session, if this thread has none yet if (s == null) { s = sessionFactory.openSession(); // Store it in the ThreadLocal variable session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = (Session) session.get(); if (s != null) s.close(); session.set(null); } static Connection conn; static Statement st; public static void setup(String sql) { try { // Step 1: Load the JDBC driver. Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); // Step 2: Establish the connection to the database. String url = "jdbc:hsqldb:data/tutorial"; conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); st.executeUpdate(sql); } catch (Exception e) { System.err.println("Got an exception! "); e.printStackTrace(); System.exit(0); } } public static void checkData(String sql) { try { HibernateUtil.outputResultSet(st .executeQuery(sql));
// conn.close();
} catch (Exception e) { e.printStackTrace(); } } public static void outputResultSet(ResultSet rs) throws Exception{ ResultSetMetaData metadata = rs.getMetaData(); int numcols = metadata.getColumnCount(); String[] labels = new String[numcols]; int[] colwidths = new int[numcols]; int[] colpos = new int[numcols]; int linewidth; for (int i = 0; i < numcols; i++) { labels[i] = metadata.getColumnLabel(i + 1); // get its label System.out.print(labels[i]+" "); } System.out.println("------------------------"); while (rs.next()) { for (int i = 0; i < numcols; i++) { Object value = rs.getObject(i + 1); if(value == null){ System.out.print(" "); }else{ System.out.print(value.toString().trim()+" "); } } System.out.println(" "); } }
}
</source>
One To Many Mapping based on Bag
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception { HibernateUtil.setup("create table grouptable (id int,name varchar);"); HibernateUtil.setup("create table story (id int,info varchar,idx int,parent_id int);"); Session session = HibernateUtil.currentSession(); Group sp = new Group("Group Name"); ArrayList list = new ArrayList(); list.add(new Story("Story Name 1")); list.add(new Story("Story Name 2")); sp.setStories(list); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(sp); transaction.rumit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); throw e; } } finally { session.close(); } HibernateUtil.checkData("select * from grouptable"); HibernateUtil.checkData("select * from story"); }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Group" table="grouptable"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <bag name="stories" cascade="all"> <key column="parent_id"/> <one-to-many class="Story"/> </bag> <property name="name" type="string"/> </class> <class name="Story" table="story"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <property name="info"/> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
import java.util.*;
public class Group {
private int id; private String name; private List stories; public Group(){ } public Group(String name) { this.name = name; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String n) { name = n; } public String getName() { return name; } public void setStories(List l) { stories = l; } public List getStories() { return stories; }
}
///////////////////////////////////////////////////////////////////////// import java.util.*; public class Story {
private int id; private String info; public Story(){ } public Story(String info) { this.info = info; } public void setId(int i) { id = i; } public int getId() { return id; } public void setInfo(String n) { info = n; } public String getInfo() { return info; }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="Group.hbm.xml"/> </session-factory>
</hibernate-configuration>
///////////////////////////////////////////////////////////////////////// import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil {
public static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernate.cfg.xml sessionFactory = new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static final ThreadLocal session = new ThreadLocal(); public static Session currentSession() throws HibernateException { Session s = (Session) session.get(); // Open a new Session, if this thread has none yet if (s == null) { s = sessionFactory.openSession(); // Store it in the ThreadLocal variable session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = (Session) session.get(); if (s != null) s.close(); session.set(null); } static Connection conn; static Statement st; public static void setup(String sql) { try { // Step 1: Load the JDBC driver. Class.forName("org.hsqldb.jdbcDriver"); System.out.println("Driver Loaded."); // Step 2: Establish the connection to the database. String url = "jdbc:hsqldb:data/tutorial"; conn = DriverManager.getConnection(url, "sa", ""); System.out.println("Got Connection."); st = conn.createStatement(); st.executeUpdate(sql); } catch (Exception e) { System.err.println("Got an exception! "); e.printStackTrace(); System.exit(0); } } public static void checkData(String sql) { try { HibernateUtil.outputResultSet(st .executeQuery(sql));
// conn.close();
} catch (Exception e) { e.printStackTrace(); } } public static void outputResultSet(ResultSet rs) throws Exception{ ResultSetMetaData metadata = rs.getMetaData(); int numcols = metadata.getColumnCount(); String[] labels = new String[numcols]; int[] colwidths = new int[numcols]; int[] colpos = new int[numcols]; int linewidth; for (int i = 0; i < numcols; i++) { labels[i] = metadata.getColumnLabel(i + 1); // get its label System.out.print(labels[i]+" "); } System.out.println("------------------------"); while (rs.next()) { for (int i = 0; i < numcols; i++) { Object value = rs.getObject(i + 1); if(value == null){ System.out.print(" "); }else{ System.out.print(value.toString().trim()+" "); } } System.out.println(" "); } }
}
</source>
One To Many Mapping based on Set
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.*; import org.hibernate.*; import org.hibernate.criterion.*; public class SimpleRetrieveTest {
public static void main(String[] args) { HibernateUtil.setup("create table EVENTS ( uid int, name VARCHAR, start_Date date, duration int, location_id int);"); HibernateUtil.setup("create table speakers ( uid int, event_id int, firstName VARCHAR, lastName VARCHAR);"); // hibernate code start Session session = HibernateUtil.currentSession(); Transaction tx = session.beginTransaction();
Event event = new Event(); event.setName("One-to-many test"); event.setSpeakers(new HashSet()); event.getSpeakers().add(new Speaker("John", "Smith")); event.getSpeakers().add(new Speaker("Dave", "Smith")); event.getSpeakers().add(new Speaker("Joan", "Smith")); session.saveOrUpdate(event);
tx.rumit(); HibernateUtil.closeSession(); HibernateUtil.sessionFactory.close(); HibernateUtil.checkData("select * from speakers"); HibernateUtil.checkData("select uid, name from events"); // hibernate code end }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Event" table="events"> <id name="id" column="uid" type="long" unsaved-value="null"> <generator class="increment"/> </id> <property name="name" type="string" length="100"/> <property name="startDate" column="start_date" type="date"/> <property name="duration" type="integer"/> <many-to-one name="location" column="location_id" class="Location"/> <set name="speakers" cascade="all"> <key column="event_id"/> <one-to-many class="Speaker"/> </set> <set name="attendees" cascade="all"> <key column="event_id"/> <one-to-many class="Attendee"/> </set> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
import java.util.Date;
import java.util.Set;
public class Event {
private Long id; private String name; private Date startDate; private int duration; private Set speakers; private Set attendees; private Location location; public void setId(Long id) { this.id = id; } public Long getId() { return id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getStartDate() { return startDate; } public void setStartDate(Date startDate) { this.startDate = startDate; } public int getDuration() { return duration; } public void setDuration(int duration) { this.duration = duration; } public Location getLocation() { return location; } public void setLocation(Location location) { this.location = location; } public void setSpeakers(Set speakers) { this.speakers = speakers; } public Set getSpeakers() { return speakers; } public Set getAttendees() { return attendees; } public void setAttendees(Set attendees) { this.attendees = attendees; }
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Speaker" table="speakers"> <id name="id" column="uid" type="long"> <generator class="increment"/> </id> <property name="firstName" type="string" length="20"/> <property name="lastName" type="string" length="20"/> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
public class Speaker {
private Long id; private String firstName; private String lastName; public Speaker() { } public Speaker(String firstName, String lastName) { setFirstName(firstName); setLastName(lastName); } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="Event.hbm.xml"/> <mapping resource="Speaker.hbm.xml"/> <mapping resource="Attendee.hbm.xml"/> <mapping resource="Location.hbm.xml"/> </session-factory>
</hibernate-configuration>
</source>
One To Many Mapping List
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception { HibernateUtil.setup("create table grouptable (id int,name varchar);"); HibernateUtil.setup("create table story (id int,info varchar,idx int,parent_id int);"); Session session = HibernateUtil.currentSession(); Group sp = new Group("Group Name"); ArrayList list = new ArrayList(); list.add(new Story("Story Name 1")); list.add(new Story("Story Name 2")); sp.setStories(list); Transaction transaction = null; try { transaction = session.beginTransaction(); session.save(sp); transaction.rumit(); } catch (Exception e) { if (transaction != null) { transaction.rollback(); throw e; } } finally { session.close(); } HibernateUtil.checkData("select * from grouptable"); HibernateUtil.checkData("select * from story"); }
}
/////////////////////////////////////////////////////////////////////////
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Group" table="grouptable"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <list name="stories" cascade="all"> <key column="parent_id"/> <index column="idx"/> <one-to-many class="Story"/> </list> <property name="name" type="string"/> </class> <class name="Story" table="story"> <id name="id" unsaved-value="0"> <generator class="increment"/> </id> <property name="info"/> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////
import java.util.*;
public class Group {
private int id; private String name; private List stories; public Group(){ } public Group(String name) { this.name = name; } public void setId(int i) { id = i; } public int getId() { return id; } public void setName(String n) { name = n; } public String getName() { return name; } public void setStories(List l) { stories = l; } public List getStories() { return stories; }
}
///////////////////////////////////////////////////////////////////////// import java.util.*; public class Story {
private int id; private String info; public Story(){ } public Story(String info) { this.info = info; } public void setId(int i) { id = i; } public int getId() { return id; } public void setInfo(String n) { info = n; } public String getInfo() { return info; }
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <property name="show_sql">true</property> <mapping resource="Group.hbm.xml"/> </session-factory>
</hibernate-configuration>
</source>