知识大全 Hibernate中配置复合主键映射

Posted 2022-07-18 知

篇首语：三人行，必有我师焉。择其善者而从之，其不善者而改之。本文由小常识网(cha138.com)小编为大家整理，主要介绍了知识大全 Hibernate中配置复合主键映射相关的知识，希望对你有一定的参考价值。

Hibernate中配置复合主键映射 以下文字资料是由(全榜网网www.cha138.com)小编为大家搜集整理后发布的内容，让我们赶快一起来看一下吧！

　　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()));

cha138/Article/program/Java/ky/201311/27962