Criterion & DetachedCriteria

2019-11-14 22:12:22

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今天筆記主要是記錄筆記，以及代碼：　

criteria: 創建查詢接口：createCriteria(class)查詢條件接口：add(各種條件);Restrictions 提供了設置參數的各種接口邏輯運算 not or and 字符串模式匹配 like ilike范圍運算 in not in between between and 比較運算 eq/le/lt.....集合運算 isNotEmpty可以鏈式編程List grades=session.createCriteria(Grade.class).add(Restrictions.or(Restrictions.eq("gradename", "一年級"), Restrictions.le("gradeid", 3))).list();

關于各種方法的使用，代碼中都有注釋

注解配置：可以在啟動AnnotationConfiguration時在數據庫創建配置的表

注解：

　需要引入四個包：

 1 package entity; 2 import java.io.Serializable; 3 import javax.persistence.*; 4  5 @Entity 6 @Table(name="test_g") 7 public class TestNoteGrade implements Serializable{ 8     PRivate Integer id ; 9     private String name;10     @Id11     @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="seq_grade")12     @SequenceGenerator(name="seq_grade",sequenceName="seq_gradeid",allocationSize=1,initialValue=1)13     public Integer getId() {14         return id;15     }16     17     public void setId(Integer id) {18         this.id = id;19     }20     @Basic21     public String getName() {22         return name;23     }24     public void setName(String name) {25         this.name = name;26     }27     28     29     30     31 }

　　在hibernate中需要配置 mapping:

　　還有種生成實體類與映射文件的方法：

　　　　反推（用myeclipse來操作）

java 測試代碼：

  1 package test4Criteria;  2   3 import java.util.ArrayList;  4 import java.util.List;  5 import java.util.Set;  6   7 import junit.framework.TestCase;  8 import org.hibernate.Criteria;  9 import org.hibernate.Session; 10 import org.hibernate.cfg.AnnotationConfiguration; 11 import org.hibernate.criterion.Criterion; 12 import org.hibernate.criterion.DetachedCriteria; 13 import org.hibernate.criterion.Order; 14 import org.hibernate.criterion.Projections; 15 import org.hibernate.criterion.Property; 16 import org.hibernate.criterion.Restrictions; 17  18 import entity.Grade; 19 import entity.Student; 20 import entity.TrStudent; 21  22 import util.HibernateUtil; 23  24 public class Criterion01 extends TestCase{ 25     Session session=null; 26      27      28      29     /** 30      * critertion 查詢 31      */ 32     public void testCriterion1(){ 33         try { 34             session=HibernateUtil.currentSession(); 35             session.beginTransaction(); 36             //查詢整個類 37             List grade=session.createCriteria(Grade.class).list(); 38             for(int i=0;i<grade.size();i++){ 39                 Grade gra=(Grade)grade.get(i); 40                 System.out.println(gra); 41                  42             } 43              44              45         } catch (Exception e) { 46             // TODO: handle exception 47             e.printStackTrace(); 48         }finally{ 49             HibernateUtil.closeSession(); 50         } 51         try { 52             session=HibernateUtil.currentSession(); 53             session.beginTransaction(); 54             //查詢指定值 55             List grade=session.createCriteria(Grade.class)// 56                         .add(Restrictions.eq("gradename","一年級"))// 57                         .list(); 58             for(int i=0;i<grade.size();i++){ 59                 Grade gra=(Grade)grade.get(i); 60                 System.out.println(gra); 61                  62             } 63              64              65         } catch (Exception e) { 66             // TODO: handle exception 67             e.printStackTrace(); 68         }finally{ 69             HibernateUtil.closeSession(); 70         } 71          72     } 73     /** 74      * 比較運算 75      */ 76     public void testCriterion2(){ 77         try { 78             session=HibernateUtil.currentSession(); 79             session.beginTransaction(); 80             //大于條件 81             List grades=session.createCriteria(Grade.class).add(Restrictions.gt("gradeid", 2)).list(); 82              83             for(int i=0;i<grades.size();i++){ 84                 System.out.println((Grade)grades.get(i)); 85                  86             } 87         } catch (Exception e) { 88             // TODO: handle exception 89             e.printStackTrace(); 90         }finally{ 91             HibernateUtil.closeSession(); 92              93         } 94         System.out.println("---大于等于條件--------------------"); 95         try { 96             session=HibernateUtil.currentSession(); 97             session.beginTransaction(); 98             //大于等于條件 99             List grades=session.createCriteria(Grade.class).add(Restrictions.ge("gradeid", 2)).list();100             101             for(int i=0;i<grades.size();i++){102                 System.out.println((Grade)grades.get(i));103                 104             }105         } catch (Exception e) {106             // TODO: handle exception107             e.printStackTrace();108         }finally{109             HibernateUtil.closeSession();110             111         }112         113         System.out.println("---小于等于條件--------------------");114         try {115             session=HibernateUtil.currentSession();116             session.beginTransaction();117             //大于等于條件118             List grades=session.createCriteria(Grade.class).add(Restrictions.le("gradeid", 2)).list();119             120             for(int i=0;i<grades.size();i++){121                 System.out.println((Grade)grades.get(i));122                 123             }124         } catch (Exception e) {125             // TODO: handle exception126             e.printStackTrace();127         }finally{128             HibernateUtil.closeSession();129             130         }131         System.out.println("---等于空--------------------");132         try {133             session=HibernateUtil.currentSession();134             session.beginTransaction();135             //大于等于條件136             List grades=session.createCriteria(Grade.class).add(Restrictions.isNull("gradeid")).list();137             138             for(int i=0;i<grades.size();i++){139                 System.out.println((Grade)grades.get(i));140                 141             }142         } catch (Exception e) {143             // TODO: handle exception144             e.printStackTrace();145         }finally{146             HibernateUtil.closeSession();147             148         }149         150     }151     /**152      * 范圍運算153      */154     public void testCriterion3(){155         try {156             session=HibernateUtil.currentSession();157             session.beginTransaction();158             Object[] obj={1,2,3};159             //in160             List grades=session.createCriteria(Grade.class)//161                     .add(Restrictions.in("gradeid",obj))//162                     .list();163             for(int i=0;i<grades.size();i++){164                 System.out.println((Grade)grades.get(i));165                 166             }167         } catch (Exception e) {168             // TODO: handle exception169             e.printStackTrace();170         }171         finally{172             HibernateUtil.closeSession();173             174         }175         System.out.println("-----not--in------");176         try {177             session=HibernateUtil.currentSession();178             session.beginTransaction();179             Object[] obj={1,2,3};180             //in181             List grades=session.createCriteria(Grade.class)//182                     .add(Restrictions.not(Restrictions.in("gradeid",obj)))//183                     .list();184             for(int i=0;i<grades.size();i++){185                 System.out.println((Grade)grades.get(i));186                 187             }188         } catch (Exception e) {189             // TODO: handle exception190             e.printStackTrace();191         }192         finally{193             HibernateUtil.closeSession();194             195         }196         197         System.out.println("--not-between- and--");198         try {199             session=HibernateUtil.currentSession();200             session.beginTransaction();201             Object[] obj={1,2,3};202             //in203             List grades=session.createCriteria(Grade.class)//204                     .add(Restrictions.not(Restrictions.between("gradeid",1,3)))//205                     .list();206             for(int i=0;i<grades.size();i++){207                 System.out.println((Grade)grades.get(i));208                 209             }210         } catch (Exception e) {211             // TODO: handle exception212             e.printStackTrace();213         }214         finally{215             HibernateUtil.closeSession();216             217         }218         219         System.out.println("---between- and--");220         try {221             session=HibernateUtil.currentSession();222             session.beginTransaction();223             Object[] obj={1,2,3};224             //in225             List grades=session.createCriteria(Grade.class)//226                         .add(Restrictions.between("gradeid",1,3))//227                         .list();228             for(int i=0;i<grades.size();i++){229                 System.out.println((Grade)grades.get(i));230                 231             }232         } catch (Exception e) {233             // TODO: handle exception234             e.printStackTrace();235         }236         finally{237             HibernateUtil.closeSession();238             239         }240     }241     242     /**243      * 字符串模式匹配  like ilike  244      */245     public void testCriterion4(){246         try {247             session=HibernateUtil.currentSession();248             session.beginTransaction();249             String scase="ab";250             List student=session.createCriteria(Student.class).add(Restrictions.like("name", "%"+scase+"%")).list();251             for(int i=0;i<student.size();i++){252                     Student stu=(Student)student.get(i);253                     String name=stu.getName();254                     System.out.print(name.substring(0, name.indexOf(scase)));255                     System.err.print(name.substring(name.indexOf(scase),(name.indexOf(scase)+scase.length())));256                     if(name.indexOf(scase)==name.length()-scase.length()){257                         System.out.println("");258                         259                     }260                     System.out.println(name.substring(name.indexOf(scase)+scase.length(),name.length()));261                     262             }263         264         } catch (Exception e) {265             // TODO: handle exception266         }finally{267             HibernateUtil.closeSession();268             269         }270         System.out.println("------ilike----------");271         try {272             session=HibernateUtil.currentSession();273             session.beginTransaction();274             String scase="eli";275             List student=session.createCriteria(Student.class).add(Restrictions.ilike("name", "%"+scase+"%")).list();276             for(int i=0;i<student.size();i++){277                 Student stu=(Student)student.get(i);278                 String name=stu.getName().toLowerCase();279                 System.out.print(name.substring(0, name.indexOf(scase)));280                 System.err.print(name.substring(name.indexOf(scase),(name.indexOf(scase)+scase.length())));281                 if(name.indexOf(scase)==name.length()-scase.length()){282                     System.out.println("");283                     284                 }285                 System.out.println(name.substring(name.indexOf(scase)+scase.length(),name.length()));286                 287             }288         } catch (Exception e) {289             // TODO: handle exception290         }finally{291             HibernateUtil.closeSession();292             293         }294     }295     /**296      * 邏輯運算297      */298     public void testCriterion5(){299         try {300             session=HibernateUtil.currentSession();301             session.beginTransaction();302             List grades=session.createCriteria(Grade.class).add(Restrictions.and(Restrictions.eq("gradename", "一年級"), Restrictions.le("gradeid", 5))).list();303             for(int i=0;i<grades.size();i++){304                 System.out.println(grades.get(i));305                 306             }307         } catch (Exception e) {308             // TODO: handle exception309             e.printStackTrace();310         }finally{311             HibernateUtil.closeSession();312             313         }314         System.out.println("-------or-----------");315         try {316             session=HibernateUtil.currentSession();317             session.beginTransaction();318             List grades=session.createCriteria(Grade.class).add(Restrictions.or(Restrictions.eq("gradename", "一年級"), Restrictions.le("gradeid", 3))).list();319             for(int i=0;i<grades.size();i++){320                 System.out.println(grades.get(i));321                 322             }323         } catch (Exception e) {324             // TODO: handle exception325             e.printStackTrace();326         }finally{327             HibernateUtil.closeSession();328             329         }330         System.out.println("-------not-----------");331         try {332             session=HibernateUtil.currentSession();333             session.beginTransaction();334             List grades=session.createCriteria(Grade.class).add(Restrictions.not(Restrictions.eq("gradename", "一年級"))).list();335             for(int i=0;i<grades.size();i++){336                 System.out.println(grades.get(i));337                 338             }339         } catch (Exception e) {340             // TODO: handle exception341             e.printStackTrace();342         }finally{343             HibernateUtil.closeSession();344             345         }346         347     }348     /**349      * 集合運算350      */351     public void testCriterion6(){352         try {353             session=HibernateUtil.currentSession();354             session.beginTransaction();355             List grades=session.createCriteria(Grade.class).add(Restrictions.isNotEmpty("stu")).list();356             for(int i=0;i<grades.size();i++){357                 System.out.println(((Grade)grades.get(i)).getStu());358             }359             360             361         } catch (Exception e) {362             // TODO: handle exception363             e.printStackTrace();364         }finally{365             HibernateUtil.closeSession();366             367         }368     }369     370     /**371      * 動態查詢372      */373     public void testTrends(){374         try {375             session=HibernateUtil.currentSession();376             session.beginTransaction();377             TrStudent tr=new TrStudent();378             tr.setName("%eli%");379             tr.setStartGrade(1);380             tr.setEndGrade(3);381             Criteria cri= session.createCriteria(Student.class);382             if(tr.getName()!=null){383                 cri.add(Restrictions.like("name", tr.getName()));384             }if(tr.getStartGrade()!=null&&tr.getEndGrade()!=null){385                 cri.add(Restrictions.between("gradeid",tr.getStartGrade(),tr.getEndGrade()));386                 387             }if(tr.getStartGrade()!=null&&tr.getEndGrade()==null){388                 cri.add(Restrictions.ge("gradeid",tr.getStartGrade()));389                 390             }391             if(tr.getStartGrade()==null&&tr.getEndGrade()!=null){392                 cri.add(Restrictions.le("gradeid",tr.getEndGrade()));393                 394             }395             List student=cri.addOrder(Order.asc("gradeid")).setMaxResults(80).list();396             //根據年級排序，每頁顯示十條397             Integer pagesize=10;398             Integer page=1;399             System.out.println(student.size()/pagesize);400             for(int i=0;i<student.size()/pagesize;i++){401                 System.out.println("--------第 "+page+" 頁-------------");402                 List students=cri.addOrder(Order.asc("gradeid")).setFirstResult(pagesize*(page-1)).setMaxResults(pagesize).list();403                 page++;404                 for(int j=0;j<students.size();j++){405                     System.out.println(students.get(j));406                 }407                 System.out.println(page);408                 409                 410                 411             }412             413             414         } catch (Exception e) {415             // TODO: handle exception416             e.printStackTrace();417         }finally{418             HibernateUtil.closeSession();419         }420         421         422     }423     /**424      * 鏈接查詢425      */426     public void testrelevance(){427         try {428             session=HibernateUtil.currentSession();429             session.beginTransaction();430             List student=session.createCriteria(Student.class).createCriteria("grade").addOrder(Order.asc("gradeid")).setMaxResults(20).list();431             for(int i=0;i<student.size();i++){432                 System.out.println(student.get(i)+"/t"+((Student)student.get(i)).getGrade().getGradename());433             }434             435             436             437         } catch (Exception e) {438             // TODO: handle exception439             e.printStackTrace();440         }finally{441             HibernateUtil.closeSession();442         }443         System.out.println("---createAlias()查詢---");444         try {445             session=HibernateUtil.currentSession();446             session.beginTransaction();447             List student=session.createCriteria(Student.class,"s").createAlias("grade","g").addOrder(Order.asc("s.gradeid")).setMaxResults(20).list();448             for(int i=0;i<student.size();i++){449                 System.out.println(student.get(i)+"/t"+((Student)student.get(i)).getGrade().getGradename());450             }451             452         } catch (Exception e) {453             // TODO: handle exception454             e.printStackTrace();455         }finally{456             HibernateUtil.closeSession();457         }458     }459 460     /**461      * 投影查詢462      */463     public void testProj(){464         System.out.println("--查詢記錄總數--");465         try {466             session=HibernateUtil.currentSession();467             session.beginTransaction();468             //查詢所有年級名稱469             Object obj=session.createCriteria(Grade.class)470                     .setProjection(Projections.projectionList().add(Projections.rowCount()))471                     .list();472             System.out.println("所有班級："+obj);473             474         } catch (Exception e) {475             // TODO: handle exception476             e.printStackTrace();477         }finally{478             HibernateUtil.closeSession();479         }480         481         System.out.println("--查詢班級名稱--");482         try {483             session=HibernateUtil.currentSession();484             session.beginTransaction();485             //查詢所有年級名稱486             Object obj=session.createCriteria(Grade.class)487                     .setProjection(Projections.projectionList().add(Property.forName("gradename")))488                     .list();489             System.out.println(obj);490             491         } catch (Exception e) {492             // TODO: handle exception493             e.printStackTrace();494         }finally{495             HibernateUtil.closeSession();496         }497     }498     499     /**500      * DetachedCriteria 離線查詢501      */502     public void testoff_line(){503         try {504             //這段代碼一般放在web產生查詢條件505             DetachedCriteria det=DetachedCriteria.forClass(Student.class,"s")506                     .createAlias("s.grade", "g")507                     .add(Restrictions.eq("g.gradename", "幼兒園"));508             509             //數據訪問層510             session=HibernateUtil.currentSession();511             session.beginTransaction();512             List students=det.getExecutableCriteria(session).add(Restrictions.ilike("s.name","%yap%")).setMaxResults(50).list();513             //打印514             for(int i=0;i<students.size();i++){515                 System.out.println(students.get(i)+"/t"+((Student)students.get(i)).getGrade().getGradename());516             }517             518         } catch (Exception e) {519             // TODO: handle exception520             e.printStackTrace();521         }finally{522             HibernateUtil.closeSession();523             524         }525     }526     /**注解 的效果527      * 啟動時會在數據庫創建一個表528      */529     public void testNote(){530         try {531             AnnotationConfiguration anc=new AnnotationConfiguration().configure();532             session=anc.buildSessionFactory().openSession();533             session.beginTransaction();534             session.getTransaction().commit();535         } catch (Exception e) {536             // TODO: handle exception537             e.printStackTrace();538             session.getTransaction().rollback();539         }finally{540             session.close();541         }542         543     }544     545     546     547     548     549     550 }

Criterion&DetachedCriteria

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