Java inheritance + Interface + generic unsolvable combination

Directly add the code without nonsense:

 

Engineering Structure:

 

Entity User:

package com.smonk.user.entity;public class User {//....}

Ibasedao:

Package COM. smonk. common. base; import Java. io. serializable; import Java. util. list; public interface ibasedao <t, Id extends serializable> {public abstract list <t> findall ();/*** find all, and pagination * @ Param page number of pages to be returned * @ Param pagesize no record count * @ return */public abstract list <t> findall (INT page, int pagesize ); public abstract void save (T entity); public abstract void Delete (T entity);/*** similar to findbyproperty, when properyname = value, delete the corresponding record */public abstract void deletebyproperty (string propertyname, object value); public abstract list <t> findbyexample (T example ); /***** search for * @ Param propertyname attribute name * @ Param Value Attribute Value * @ return */public abstract list <t> findbyproperty (string propertyname, object value ); /*** query multiple attributes * @ Param propertynames attribute name array * @ Param values attribute value array * @ return */public abstract list <t> findbypropertys (string [] propertynames, object [] values);/*** searches for multiple attributes and returns them by page, the attribute name array and the attribute value array must correspond to the ** @ Param propertynames attribute name array * @ Param values attribute value array * @ Param page number * @ Param pagesize number of entries per page * @ return */public list <t> findbypropertys (string [] propertynames, object [] values, int page, int pagesize);/*** query through attributes and pagination, the sequence of the attribute name array and attribute value array must correspond to * @ Param propertynames attribute name * @ Param values attribute value * @ Param page number * @ Param pagesize number of entries per page * @ return */Public list <t> findbyproperty (string propertyname, object value, int page, int pagesize);/*** count the total number of all records * @ return total number */Public int countall (); /*** count the total number of records in the database when propertyname = value * @ Param propertyname * @ Param value * @ return */Public int countbyproperty (string propertyname, object value ); /*** count the total number of records when multiple propertynames = value in the database * @ Param propertynames * @ Param values * @ return */Public int countbypropertys (string [] propertynames, object [] values); public abstract void saveorupdate (T entity); public abstract t findbyid (ID); public abstract void Update (T entity ); /*** obtain the persistence object type * @ return */public abstract class <t> getpersistentclass (); /*** query and sort by a certain attribute * @ Param property sort by Order * @ Param issequence whether to order in sequence */public list <t> findandorderbyproperty (INT firstresult, int fetchsize, string propertyname, Boolean issequence ); /*** query and sort by a certain attribute * @ Param property sort by Order * @ Param issequence whether to order in sequence */public list <t> findallandorderbyproperty (string propertyname, boolean issequence );}

 

Basehibernatedao:

Package COM. smonk. common. base; import Java. io. serializable; import Java. lang. reflect. parameterizedtype; import Java. util. list; import Org. hibernate. query; import Org. springframework. orm. hibernate3.support. hibernatedaosupport; public abstract class basehibernatedao <t, Id extends serializable> extendshibernatedaosupport implements ibasedao <t, Id> {private class <t> persistentclass; @ suppresswarnings ("uncheck Ed ") Public basehibernatedao () {// gets the persistence object type this. persistentclass = (class <t>) (parameterizedtype) getclass (). getgenericsuperclass ()). getactualtypearguments () [0];} public class <t> getpersistentclass () {return persistentclass ;} /*** search for * @ Param ID * @ return */@ suppresswarnings ("unchecked") Public t findbyid (ID) {return (t) This. gethibernatetemplate (). get (getpersistentclass (), ID);} public void Save (T entity) {This. gethibernatetemplate (). save (entity);}/*** Delete */Public void Delete (T entity) {This. gethibernatetemplate (). delete (entity);}/*** Delete through attribute */Public void deletebyproperty (string propertyname, object Value) {string querystring = "delete from" + getpersistentclass (). getname () + "as model where model. "+ propertyname +" =? "; Query = This. getsession (). createquery (querystring); query. setparameter (0, value1_query.exe cuteupdate ();}/*** saveorupdate */Public void saveorupdate (T entity) {This. gethibernatetemplate (). saveorupdate (entity);}/*** update */Public void Update (T entity) {This. gethibernatetemplate (). update (entity );} /*** query all records by page * @ Param page number of pages to be returned * @ Param pagesize no record count * @ return */public list <t> findall (in T page, int pagesize) {string querystring = "from" + getpersistentclass (). getname (); query = This. getsession (). createquery (querystring); int firstresult = (page-1) * pagesize; query. setfirstresult (firstresult); query. setmaxresults (pagesize); Return query. list ();}/*** count the total number of all records * @ return total number */Public int countall () {string querystring = "select count (*) from "+ getpersistentclass (). getname (); Qu Ery query = This. getsession (). createquery (querystring); List list = query. list (); long result = (long) list. get (0); return result. intvalue ();}/*** find by example * @ Param entity * @ return */@ suppresswarnings ("unchecked") public list <t> findbyexample (T entity) {return this. gethibernatetemplate (). findbyexample (entity);} @ suppresswarnings ("unchecked") public list <t> findall () {return this. gethibernatetem Plate (). find ("from" + getpersistentclass (). getname ();}/*** search for the * @ Param propertyname attribute name * @ Param Value Attribute Value * @ return */@ suppresswarnings ("unchecked") through Properties ") public list <t> findbyproperty (string propertyname, object Value) {string querystring = "from" + getpersistentclass (). getname () + "as model where model. "+ propertyname +" =? "; Return this. gethibernatetemplate (). find (querystring, value );} /*** query through multiple attribute combinations * @ Param propertynames attribute name array * @ Param values returns matching results for propertynames values */public list <t> findbypropertys (string [] propertynames, object [] values) {stringbuffer strbuffer = new stringbuffer (); strbuffer. append ("from" + getpersistentclass (). getname (); strbuffer. append ("as model where"); For (INT I = 0; I <Property Names. length; I ++) {if (I! = 0) strbuffer. append ("and"); strbuffer. append ("model. "); strbuffer. append (propertynames [I]); strbuffer. append ("="); strbuffer. append ("? ");} String querystring = strbuffer. tostring (); return this. gethibernatetemplate (). find (querystring, values );} /*** query and pagination through properties * @ Param propertyname attribute name * @ Param Value Attribute Value * @ Param page number * @ Param pagesize number of entries per page */public list <t> findbyproperty (string propertyname, object value, int page, int pagesize) {return this. findbypropertys (New String [] {propertyname}, new object [] {value}, page, pagesize) ;} /*** Query through multiple attribute combinations * @ Param propertynames attribute name array * @ Param values corresponds to the value of propertynames * @ Param page number * @ Param pagesize return return matched result */public list <t> findbypropertys (string [] propertynames, object [] values, int page, int pagesize) {stringbuffer strbuffer = new stringbuffer (); strbuffer. append ("from" + getpersistentclass (). getname (); strbuffer. append ("as model where"); For (INT I = 0; I <propertynames. length; I ++) {if (I! = 0) strbuffer. append ("and"); strbuffer. append ("model. "); strbuffer. append (propertynames [I]); strbuffer. append ("="); strbuffer. append ("? ");} String querystring = strbuffer. tostring (); int firstresult = (page-1) * pagesize; query = This. getsession (). createquery (querystring); query. setfirstresult (firstresult); query. setmaxresults (pagesize); For (INT I = 0; I <values. length; I ++) {query. setparameter (I, values [I]);} return query. list ();}/*** count by attribute * @ Param propertyname attribute name * @ Param Value Attribute Value */Public int countbyproperty (string Propertyname, object Value) {string [] propertynames = new string [] {propertyname}; object [] values = new object [] {value}; return this. countbypropertys (propertynames, values );} /*** count by multiple attributes * @ Param propertynames attribute name array * @ Param values returns */Public int countbypropertys (string [] propertynames, object [] values) {stringbuffer strbuffer = new stringbuffer (); strbuffer. append ("select Co Unt (*) from "+ getpersistentclass (). getname (); strbuffer. append ("as model where"); For (INT I = 0; I <propertynames. length; I ++) {if (I! = 0) strbuffer. append ("and"); strbuffer. append ("model. "); strbuffer. append (propertynames [I]); strbuffer. append ("="); strbuffer. append ("? ");} String querystring = strbuffer. tostring (); query = This. getsession (). createquery (querystring); For (INT I = 0; I <values. length; I ++) {query. setparameter (I, values [I]);} List list = query. list (); long result = (long) list. get (0); return result. intvalue ();}/*** search for T and sort it by a certain attribute * @ Param property sort order * @ Param issequence indicates whether the sequence is ordered, false is in reverse order */public list <t> findandorderbyproperty (INT firstresult, int fetchsize, string propertyname, Boolean issequence) {string querystring = "from" + getpersistentclass (). getname () + "as model order by model. "+ propertyname; If (issequence = false) {querystring = querystring +" DESC ";} query queryobject = getsession (). createquery (querystring); queryobject. setfirstresult (firstresult); queryobject. setmaxresults (fetchsize); Return queryobject. list ();} /*** search for all and sort by a certain attribute * @ Param propertyname sort by attribute name * @ Param issequence Order */public list <t> findallandorderbyproperty (string propertyname, boolean issequence) {string querystring = "from" + getpersistentclass (). getname () + "as model order by model. "+ propertyname; If (issequence = false) {querystring = querystring +" DESC ";} query queryobject = getsession (). createquery (querystring); Return queryobject. list ();}}

Iuserdao:

Package COM. smonk. user. dao; import COM. smonk. common. base. ibasedao; import COM. smonk. user. entity. user; public interface iuserdao extends ibasedao <user, integer> {/*** search for a user using the user name * @ Param username * @ return Tuser user object, if the user name does not exist, return NULL */public user findbyusername (string username );}

Userhibernatedao:

Package COM. smonk. user. dao; import Java. util. list; import COM. smonk. common. base. basehibernatedao; import COM. smonk. user. entity. user; public class userhibernatedao extends basehibernatedao <user, integer> implementsiuserdao {// property constantspublic static final string user_name = "username "; /*** search for the user by name * @ return user */public user findbyusername (string username) {list <user> userlist = super. findby Property (user_name, username); If (userlist. Size ()! = 0) {return userlist. get (0) ;}else {return NULL ;}} public static void main (string [] ARGs) {INTEGER id = 10; iuserdao Dao = new userhibernatedao (); Dao. findbyid (ID );}}

See how many functions userdao has with just a few sentences !!! :

 

Dear user, how much code does this architecture save? How many person-days are saved? How boring and annoying does it save ?...