跟我學(xué)Hibernate框架技術(shù)在容器外實(shí)現(xiàn)Hibernate框架繼承映射關(guān)系第2部分

1、楊教授工作室 精心創(chuàng)作的優(yōu)秀程序員 職業(yè)提升必讀系列資料目 錄1.1在容器外實(shí)現(xiàn)hibernate框架繼承映射關(guān)系及實(shí)例（第2部分）21.1.1應(yīng)用單元測(cè)試技術(shù)測(cè)試本實(shí)例的應(yīng)用效果21.1.2體驗(yàn)hibernate中l(wèi)azy技術(shù)91.1.3體驗(yàn)多態(tài)查詢(xún)技術(shù)的應(yīng)用101.1.4進(jìn)一步完善本項(xiàng)目的實(shí)例111.1 在容器外實(shí)現(xiàn)hibernate框架繼承映射關(guān)系及實(shí)例（第2部分）1.1.1 應(yīng)用單元測(cè)試技術(shù)測(cè)試本實(shí)例的應(yīng)用效果1、增加一個(gè)dao的接口derivedhibernatedaointerface包名稱(chēng)為er在該接口中添加下面的方法pac

2、kage er;import org.hibernate.hibernateexception;public interface derivedhibernatedaointerface public boolean dofindallpersoninfo() throws hibernateexception;2、提供對(duì)該方法的實(shí)現(xiàn)類(lèi)derivedhibernatedaoimple包名稱(chēng)為com.px1987.sshwebcrm.dao.implepackage com.px1987.sshwebcrm.dao.imple;import

3、 java.util.arraylist;import java.util.list;import mons.logging.log;import mons.logging.logfactory;import org.hibernate.hibernateexception;import org.hibernate.session;import org.hibernate.transaction;import er.derivedhibernatedaointerface;import com.px1987.sshwebcrm.dao.p

4、object.abstractpersonpo;import com.px1987.sshwebcrm.dao.pobject.studentpo;import com.px1987.sshwebcrm.dao.pobject.teacherpo;import com.px1987.sshwebcrm.dao.util.hibernateutil;public class derivedhibernatedaoimple implements derivedhibernatedaointerface private static log log = logfactory.getlog(deri

5、vedhibernatedaoimple.class);public derivedhibernatedaoimple() public boolean dofindallpersoninfo() throws hibernateexception session session=null;transaction tx=null;list findresults = new arraylist();try session = hibernateutil.currentsession();tx = session.begintransaction();list allstudentinfo =

6、session.createquery("from com.px1987.sshwebcrm.dao.pobject.studentpo").list();findresults.addall(allstudentinfo);list allteacherinfo =session.createquery("from com.px1987.sshwebcrm.dao.pobject.teacherpo").list();findresults.addall(allteacherinfo); printallpersoninfo(findresults);

7、 mit();catch (hibernateexception he) log.error("在dofindallpersoninfo方法中出現(xiàn)了hibernateexception錯(cuò)誤", he);throw he;finally hibernateutil.closesession();return true;private void printallpersoninfo (java.util.list allpersonlist) /利用該方法實(shí)現(xiàn)數(shù)據(jù)顯示 java.util.iterator iterator= allpersonlist.iterator();

8、while(iterator.hasnext() abstractpersonpo oneperson=(abstractpersonpo)iterator.next(); if(oneperson instanceof studentpo) int departmentid=(studentpo)oneperson).getdepartment().getid(); string departmentname=(studentpo)oneperson).getdepartment().getdepname(); int studentid=(studentpo)oneperson).geti

9、d(); string studentname=(studentpo)oneperson).getpersonname(); int studentlevel=(studentpo)oneperson).getstudentlevel (); string studentmajor=(studentpo)oneperson).getstudentmajor(); system.out.print("departmentid="+departmentid+"t"); system.out.print("departmentname="+

10、departmentname+"t"); system.out.print("studentid="+studentid+"t"); system.out.print("studentname="+studentname+"t"); system.out.print("studentlevel="+studentlevel+"n"); system.out.print("studentmajor="+studentmajor+"

11、;n"); else int departmentid=(teacherpo)oneperson).getdepartment().getid(); string departmentname=(teacherpo)oneperson).getdepartment().getdepname(); int teacherid=(teacherpo)oneperson).getid(); string teachername=(teacherpo)oneperson).getpersonname(); string coursename=(teacherpo)oneperson).get

12、coursename(); float teachermonthsalary=(teacherpo)oneperson).getmonthsalary(); system.out.print("departmentid="+departmentid+"t"); system.out.print("departmentname="+departmentname+"t"); system.out.print("teacherid="+teacherid+"t"); system.

13、out.print("teachername="+teachername+"t"); system.out.print("teachermonthsalary="+teachermonthsalary+"n"); system.out.print("coursename="+coursename+"n"); 3、添加測(cè)試用例testderivedhibernatedaoimple包名稱(chēng)為com.px1987.hexample.dao.test，被測(cè)試類(lèi)為derivedhibe

14、rnatedaoimple在測(cè)試用例中對(duì)該方法進(jìn)行測(cè)試package com.px1987.hexample.dao.test;import junit.framework.assert;import org.junit.afterclass;import org.junit.beforeclass;import org.junit.test;import com.px1987.sshwebcrm.dao.imple.derivedhibernatedaoimple;import er.derivedhibernatedaointerfa

15、ce;public class testderivedhibernatedaoimple static derivedhibernatedaointerface onederivedhibernatedaobean=null;beforeclasspublic static void setupbeforeclass() throws exception onederivedhibernatedaobean=new derivedhibernatedaoimple();afterclasspublic static void teardownafterclass() throws except

16、ion onederivedhibernatedaobean=null;testpublic void testdofindallpersoninfo() boolean actualreturn=onederivedhibernatedaobean.dofindallpersoninfo();assert.asserttrue(actualreturn);4、執(zhí)行測(cè)試用例將出現(xiàn)下面的結(jié)果1.1.2 體驗(yàn)hibernate中l(wèi)azy技術(shù)如果將對(duì)department表的訪(fǎng)問(wèn)代碼（也就是上面的黑體部分）除掉，然后再次執(zhí)行，將發(fā)現(xiàn)沒(méi)有對(duì)department表進(jìn)行查詢(xún)，因?yàn)閔ibernate缺省時(shí)是采

17、用 lazy加載的-只在真正需要該數(shù)據(jù)時(shí)，才加載所關(guān)聯(lián)的數(shù)據(jù)。1.1.3 體驗(yàn)多態(tài)查詢(xún)技術(shù)的應(yīng)用將dao中的hql語(yǔ)句改變?yōu)橄旅娴男问絣ist allstudentinfo = session.createquery("from com.px1987.sshwebcrm.dao.pobject.studentpo").list();findresults.addall(allstudentinfo);list allteacherinfo =session.createquery("from com.px1987.sshwebcrm.dao.pobject.tea

18、cherpo").list();list allstudentinfo =session.createquery("from com.px1987.sshwebcrm.dao.pobject.abstractpersonpo").list();findresults.addall(allstudentinfo);觀察執(zhí)行的結(jié)果是否與前面的采用兩條hql語(yǔ)句的效果相同。1.1.4 進(jìn)一步完善本項(xiàng)目的實(shí)例1、在dao組件中再增加一個(gè)doinsertallpersoninfo方法以實(shí)現(xiàn)保存數(shù)據(jù)的功能2、修改derivedhibernatedaointerfacepack

19、age er;import org.hibernate.hibernateexception;public interface derivedhibernatedaointerface public boolean dofindallpersoninfo() throws hibernateexception;public boolean doinsertallpersoninfo() throws hibernateexception ;3、修改實(shí)現(xiàn)類(lèi)代碼示例public boolean doinsertallpersoninfo()

20、throws hibernateexception session session=null;transaction tx=null;try session = hibernateutil.currentsession();tx = session.begintransaction(); studentpo onestudent=new studentpo();onestudent.setpersonname("zhao");onestudent.setstudentlevel(4);onestudent.setstudentmajor("計(jì)算機(jī)應(yīng)用")

21、; int departmentid=1;departmentpo onedepartment=(departmentpo)session.load(departmentpo.class,new integer(departmentid); onestudent.setdepartment(onedepartment); session.save(onestudent); mit();catch (hibernateexception he) log.error("在doinsertallpersoninfo方法中出現(xiàn)了hibernateexception錯(cuò)誤", he);

22、throw he;finally hibernateutil.closesession();return true;4、修改測(cè)試用例package com.px1987.hexample.dao.test;import java.io.unsupportedencodingexception;import junit.framework.assert;import org.hibernate.hibernateexception;import org.junit.afterclass;import org.junit.beforeclass;import org.junit.test;import com.px1987.sshwebcrm.dao.imple.derivedhibernatedaoimple;import er.derivedhibernatedaoi