映射f与它的逆映射复合的结果 Hibernate中配置复合主键映射

Hibernate中配置复合主键映射  

　　 通常将复合主键单独建一个类     复合主键类必须实现java io Serializable接口 必须重写hashCode和equals方法     在映射文件中配置复合主键

　　hibernate cfg xml:

　　scott

　　jdbc:oracle:thin:@ : :MGC

　　 hibernate dialect Oracle Dialect

　　MGC

　　tiger

　　oracle jdbc driver OracleDriver

　　true    YearPeriodPK java:

　　package cn edu ahau mgc hibernate pojo;

　　import java io Serializable;

　　public class YearPeriodPK implements Serializable{

　　private int year;        private int period;

　　public int getYear() {            return year;        }

　　public void setYear(int year) {            this year = year;        }

　　public int getPeriod() {            return period;        }

　　public void setPeriod(int period) {            this period = period;        }

　　@Override        public int hashCode() {            final int prime = ;            int result = ;            result = prime * result + period;            result = prime * result + year;            return result;        }

　　@Override        public boolean equals(Object obj) {            if (this == obj)                return true;            if (obj == null)                return false;            if (getClass() != obj getClass())                return false;            final YearPeriodPK other = (YearPeriodPK) obj;            if (period != other period)                return false;            if (year != other year)                return false;            return true;        }    }

　　YearPeriod java:

　　package cn edu ahau mgc hibernate pojo;

　　import java util Calendar;

　　public class YearPeriod {

　　private YearPeriodPK yearPeriodPK;        private Calendar beginDate;        private Calendar endDate;

　　public YearPeriodPK getYearPeriodPK() {            return yearPeriodPK;        }

　　public void setYearPeriodPK(YearPeriodPK yearPeriodPK) {            this yearPeriodPK = yearPeriodPK;        }

　　public Calendar getBeginDate() {            return beginDate;        }

　　public void setBeginDate(Calendar beginDate) {            this beginDate = beginDate;        }

　　public Calendar getEndDate() {            return endDate;        }

　　public void setEndDate(Calendar endDate) {            this endDate = endDate;        }

　　}

　　YearPeriod hbm xml:

　　HibernateSessionFactory java:

　　package cn edu ahau mgc hibernate many one factory;

　　import hibernate HibernateException;    import hibernate Session;    import hibernate cfg Configuration;

　　/**     * Configures and provides access to Hibernate sessions tied to the     * current thread of execution   Follows the Thread Local Session     * pattern see {@link ;}      */    public class HibernateSessionFactory {

　　/**         * Location of hibernate cfg xml file          * Location should be on the classpath as Hibernate uses         * #resourceAsStream style lookup for its configuration file          * The default classpath location of the hibernate config file is         * in the default package Use #setConfigFile() to update         * the location of the configuration file for the current session          */        private static String CONFIG_FILE_LOCATION = /hibernate cfg xml ;        private static final ThreadLocal threadLocal = new ThreadLocal();        private  static Configuration configuration = new Configuration();        private static hibernate SessionFactory sessionFactory;        private static String configFile = CONFIG_FILE_LOCATION;

　　static {            try {                nfigure(configFile);                sessionFactory = configuration buildSessionFactory();            } catch (Exception e) {                System err                        println( %%%% Error Creating SessionFactory %%%% );                e printStackTrace();           }        }        private HibernateSessionFactory() {        }

　　/**         * Returns the ThreadLocal Session instance   Lazy initialize         * the SessionFactory if needed          *         *  @return Session         *  @throws HibernateException         */        public static Session getSession() throws HibernateException {            Session session = (Session) threadLocal get();

　　if (session == null || !session isOpen()) {                if (sessionFactory == null) {                    rebuildSessionFactory();                }               session = (sessionFactory != null) ? sessionFactory openSession()                        : null;                threadLocal set(session);            }

　　return session;        }

　　/**         *  Rebuild hibernate session factory         *         */        public static void rebuildSessionFactory() {            try {                nfigure(configFile);               sessionFactory = configuration buildSessionFactory();            } catch (Exception e) {                System err                        println( %%%% Error Creating SessionFactory %%%% );                e printStackTrace();            }        }

　　/**         *  Close the single hibernate session instance          *         *  @throws HibernateException         */        public static void closeSession() throws HibernateException {            Session session = (Session) threadLocal get();            threadLocal set(null);

　　if (session != null) {                session close();            }        }

　　/**         *  return session factory         *         */        public static hibernate SessionFactory getSessionFactory() {            return sessionFactory;        }

　　/**         *  return session factory         *         *    session factory will be rebuilded in the next call         */        public static void setConfigFile(String configFile) {            HibernanfigFile = configFile;            sessionFactory = null;        }

　　/**         *  return hibernate configuration        *         */        public static Configuration getConfiguration() {            return configuration;        }

　　}

　　ExportToDBCreate java:

　　package cn edu ahau mgc hibernate export;

　　import hibernate cfg Configuration;    import hibernate tool hbm ddl SchemaExport;

　　public class ExportToDBCreate {

　　public static void main(String[] args) {            Configuration cfg = new Configuration(nfigure();            SchemaExport export = new SchemaExport(cfg);           export create(true true);        }

　　}

　　InitData java:

　　package cn edu ahau mgc hibernate export;

　　import java util Calendar;

　　import hibernate Session;

　　import cn edu ahau mgc hibernate factory HibernateSessionFactory;    import cn edu ahau mgc hibernate pojo YearPeriod;    import cn edu ahau mgc hibernate pojo YearPeriodPK;

　　public class InitData {

　　public static void main(String[] args) {           Session session = null;            try {                session = HibernateSessionFactory getSession();               session beginTransaction();

　　YearPeriodPK yearPeriodPK = new YearPeriodPK();               yearPeriodPK setYear( );                yearPeriodPK setPeriod( );

　　YearPeriod yearPeriod = new YearPeriod();                yearPeriod setYearPeriodPK(yearPeriodPK);                Calendar beginDate = Calendar getInstance();                beginDate set( );                Calendar endDate = Calendar getInstance();                endDate set( );                yearPeriod setBeginDate(beginDate);                yearPeriod setEndDate(endDate);

　　session save(yearPeriod);                session getTransaction(mit();            } catch (Exception e) {               session getTransaction() rollback();                e printStackTrace();           } finally {                HibernateSessionFactory closeSession();            }        }

　　}

　　LoadData java:

　　package cn edu ahau mgc hibernate export;

　　import java text SimpleDateFormat;

　　import hibernate Session;

　　import cn edu ahau mgc hibernate factory HibernateSessionFactory;    import cn edu ahau mgc hibernate pojo YearPeriod;    import cn edu ahau mgc hibernate pojo YearPeriodPK;

　　public class LoadData {

　　public static void main(String[] args) {            Session session = null;            try {                session = HibernateSessionFactory getSession();                YearPeriodPK yearPeriodPK = new YearPeriodPK();                yearPeriodPK setYear( );                yearPeriodPK setPeriod( );

　　YearPeriod yearPeriod = (YearPeriod) session load(YearPeriod class yearPeriodPK);                SimpleDateFormat sdf = new SimpleDateFormat( yyyy MM dd );                System out println( Begin Date: + sdf format(yearPeriod getBeginDate() getTime()));                System out println( End Date: + sdf format(yearPeriod getEndDate() getTime()));