Java/Hibernate/Map Array
Collection Mapping: Array
<source lang="java">
///////////////////////////////////////////////////////////////////////// <?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; }
} ///////////////////////////////////////////////////////////////////////// <?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(" "); } }
}
///////////////////////////////////////////////////////////////////////// log4j.rootCategory=WARN, console log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n log4j.appender.stdout.Target=System.out
///////////////////////////////////////////////////////////////////////// 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"); }
}
/////////////////////////////////////////////////////////////////////////
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; }
}
</source>
Map Array For One To Many Map
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.Date; import java.util.List;
import org.hibernate.*; import org.hibernate.criterion.*; public class SimpleRetrieveTest {
public static void main(String[] args) { HibernateUtil.setup("create table A ( id int);"); HibernateUtil.setup("create table B ( id int, aid int);"); // hibernate code start Session session = HibernateUtil.currentSession(); Transaction tx = session.beginTransaction();
A a = new A(); B b1 = new B(); B b2 = new B(); a.setBs( new B[] {b1, b2} ); session.save(a); tx.rumit(); HibernateUtil.closeSession(); HibernateUtil.sessionFactory.close(); // hibernate code end HibernateUtil.checkData("select * from A"); HibernateUtil.checkData("select * from B"); }
}
///////////////////////////////////////////////////////////////////////// <?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="A" lazy="true"> <id name="id"> <generator class="increment"/> </id> <array name="bs" cascade="all" fetch="join" > <key column="aid"/> <list-index column="id"/> <one-to-many class="B"/> </array> </class> <class name="B" lazy="true"> <id name="id"> <generator class="increment"/> </id> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
/**
* @author Emmanuel Bernard */
public class A {
private Integer id; private B[] bs; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public B[] getBs() { return bs; } public void setBs(B[] bs) { this.bs = bs; }
}
/////////////////////////////////////////////////////////////////////////
/**
* @author Emmanuel Bernard */
public class B {
private Integer id; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; }
}
/////////////////////////////////////////////////////////////////////////
<?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="A.hbm.xml"/> </session-factory>
</hibernate-configuration> /////////////////////////////////////////////////////////////////////////
</source>
Map Array Retrieve Demo
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.Date; import java.util.List;
import org.hibernate.*; import org.hibernate.criterion.*; public class SimpleRetrieveTest {
public static void main(String[] args) { HibernateUtil.setup("create table A ( id int);"); HibernateUtil.setup("create table B ( id int, aid int);"); // hibernate code start Session session = HibernateUtil.currentSession(); Transaction tx = session.beginTransaction();
A a = new A(); B b1 = new B(); B b2 = new B(); a.setBs( new B[] {b1, b2} ); session.save(a); a = (A) session.get( A.class, a.getId() ); for(int i=0;i<a.getBs().length;i++){ System.out.println(a.getBs()[i].getId()); } tx.rumit(); HibernateUtil.closeSession(); HibernateUtil.sessionFactory.close(); // hibernate code end HibernateUtil.checkData("select * from A"); HibernateUtil.checkData("select * from B"); }
}
///////////////////////////////////////////////////////////////////////// <?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="A" lazy="true"> <id name="id"> <generator class="increment"/> </id> <array name="bs" cascade="all" fetch="join" > <key column="aid"/> <list-index column="id"/> <one-to-many class="B"/> </array> </class> <class name="B" lazy="true"> <id name="id"> <generator class="increment"/> </id> </class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
/**
* @author Emmanuel Bernard */
public class A {
private Integer id; private B[] bs; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public B[] getBs() { return bs; } public void setBs(B[] bs) { this.bs = bs; }
}
/////////////////////////////////////////////////////////////////////////
/**
* @author Emmanuel Bernard */
public class B {
private Integer id; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; }
}
/////////////////////////////////////////////////////////////////////////
<?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="A.hbm.xml"/> </session-factory>
</hibernate-configuration>
/////////////////////////////////////////////////////////////////////////
</source>