The DAO layer and service layer of SSH hibernate

1. DAO Layer Interface

 PackageCom.life.dao;Importjava.util.List;ImportJava.util.Map;ImportOrg.hibernate.Query; Public InterfaceIdao<t> {    /*** Find entities by ID * *@paramClazz *@paramID *@return     */     PublicT Find (class<t> clazz,intID);  Public voidCreate (T T);  Public voidSave (T T);  Public voidDelete (T T); /*** Query a page entity *@paramHQL Query statement *@paramFirstresult starting from the first few, note that the index starts from 0 *@parammaxResults Maximum number of data bars returned *@parammap Parameter Key value pairs *@return     */     PublicList<t> list (String hql,intFirstresult,intMaxResults, Map<string, object>map);  PublicQuery getquery (String hql, map<string, object>map); /*** Query Entity *@paramHQL *@paramMap *@return     */List<T> list (String hql, map<string, object>map); /*** Get the total number of records *@paramHQL *@paramMap *@return     */    intGettotalcount (String hql, map<string, object>map); }

DAO Layer Implementation

 PackageCom.life.dao.impl;Importjava.util.Collection;Importjava.util.List;ImportJava.util.Map;ImportJava.util.Set;ImportOrg.hibernate.Query;Importorg.hibernate.Session;Importorg.hibernate.SessionFactory;ImportCom.life.dao.IDao; Public classDaoimpl<t>ImplementsIdao<t> {    Privatesessionfactory sessionfactory; @Override PublicT Find (class<t> clazz,intID) {//TODO auto-generated Method Stub        return(T) getsession (). Get (Clazz, id); } @Override Public voidCreate (T t) {//TODO auto-generated Method Stubgetsession (). Persist (t); } @Override Public voidSave (T t) {//TODO auto-generated Method Stubgetsession (). Saveorupdate (t); } @Override Public voidDelete (T t) {//TODO auto-generated Method Stubgetsession (). Delete (t); } @Override PublicList<t> list (String hql, map<string, object>map) {        //TODO auto-generated Method StubQuery query =getquery (hql, map); List<T> list =query.list (); returnlist; } @Override Public intGettotalcount (String hql, map<string, object>map) {        //TODO auto-generated Method StubQuery query =getquery (hql, map); System.out.println ("HQL" +hql); Object obj=Query.uniqueresult (); return((Long) obj). Intvalue (); } @Override PublicList<t> list (String hql,intFirstresult,intMaxResults, Map<string, object>map) {        //TODO auto-generated Method StubQuery query =getquery (hql, map); List<T> list =Query.setfirstresult (Firstresult). Setmaxresults (maxResults). List (); System.out.println ("Start:" +Firstresult); System.out.println ("Maximum value:" +maxResults); System.out.println ("Actual value:" +list.size ()); returnlist; }         PublicSession getsession () {returnsessionfactory.getcurrentsession (); }     Publicsessionfactory getsessionfactory () {returnsessionfactory; }     Public voidsetsessionfactory (sessionfactory sessionfactory) { This. Sessionfactory =sessionfactory; } @Override PublicQuery getquery (String hql, map<string, object>map) {Query Query=getsession (). CreateQuery (HQL); //TODO auto-generated Method Stub        if(Map! =NULL) {Set<String> KeySet =Map.keyset ();  for(String string:keyset) {Object obj=Map.get (string); //here, consider what type of parameters are passed in, different methods used by different types                if(objinstanceofCollection<?>) {query.setparameterlist (String, (Collection<?>) (obj); }Else if(objinstanceofobject[])                  {Query.setparameterlist (String, (object[]) obj); }Else{query.setparameter (string, obj); }              }          }          returnquery; }}

Service Layer Interface

 PackageCom.life.service;Importjava.util.List;ImportJava.util.Map;/*** This parent interface cannot be used as a bean in applicationcontext.xml, because Serviceimpl is a virtual function * *@authorJL Service Interface, basic method*/ Public InterfaceIservice<t> {    /*** Find entities based on ID and object class*/     PublicT Find (class<t> clazz,intID); /*** Create Entities*/     Public voidCreate (T T); /*** Save entity*/     Public voidSave (T T); /*** Delete Entity*/     Public voidDelete (T T); /*** Paging Entity*/     PublicList<t> list (String hql,intFirstresult,intMaxResults, Map<string, object>map); intGettotalcount (String hql, map<string, object>map); List<T> list (String hql, map<string, object>map); List<T> listpage (String hql,intPageintMaxResults, Map<string, object>map);}

Service Layer Implementation

 PackageCom.life.service.impl;Importjava.util.List;ImportJava.util.Map;ImportCom.life.dao.IDao;ImportCom.life.service.IService;/*** Because the Create () method for each entity class has different business logic (for example, to check if an account already exists before creating a user), the class is defined as abstract * The Create () method is defined as abstract and implemented separately by the specific service * @authorJL*/ Public Abstract classServiceimpl<t>ImplementsIservice<t>{    /*** Injected through the spring IOC*/    protectedIdao<t>DAO;  PublicIdao<t>Getdao () {returnDAO; }     Public voidSetdao (idao<t>DAO) {         This. DAO =DAO; } @Override PublicT Find (class<t> clazz,intID) {//TODO auto-generated Method Stub        returnDao.find (clazz, id); } @Override Public voidCreate (T t) {dao.create (t);         }; @Override Public voidSave (T t) {//TODO auto-generated Method StubDao.save (t); } @Override Public voidDelete (T t) {//TODO auto-generated Method StubDao.delete (t); } @Override PublicList<t> list (String hql, map<string, object>map) {        //TODO auto-generated Method Stub        returndao.list (hql, map); } @Override Public intGettotalcount (String hql, map<string, object>map) {        //TODO auto-generated Method Stub        returnDao.gettotalcount (hql, map); } @Override PublicList<t> list (String hql,intFirstresult,intMaxResults, Map<string, object>map) {        //TODO auto-generated Method Stub        returndao.list (HQL, Firstresult, maxResults, map); } @Override PublicList<t> listpage (String hql,intPageintMaxResults, Map<string, object>map) {        //TODO auto-generated Method Stub        returnDao.list (HQL, maxresults* (page-1), maxResults, map); }}

Done