Criterion & DetachedCriteria
今天笔记主要是记录笔记，以及代码：
criteria:
创建查询接口：createCriteria(class)
查询条件接口：add(各种条件);
Restrictions 提供了设置参数的各种接口
逻辑运算 not or and
字符串模式匹配 like ilike
范围运算 in not in between between and
比较运算 eq/le/lt.....
集合运算 isNotEmpty
可以链式编程
List grades=session.createCriteria(Grade.class)
.add(Restrictions.or(Restrictions.eq("gradename", "一年级"), Restrictions.le("gradeid", 3)))
.list();
关于各种方法的使用，代码中都有注释
注解配置：
可以在启动AnnotationConfiguration时在数据库创建配置的表
注解：
需要引入四个包：
package entity;
import java.io.Serializable;
import javax.persistence.*; @Entity
@Table(name="test_g")
public class TestNoteGrade implements Serializable{
private Integer id ;
private String name;
@Id
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="seq_grade")
@SequenceGenerator(name="seq_grade",sequenceName="seq_gradeid",allocationSize=1,initialValue=1)
public Integer getId() {
return id;
} public void setId(Integer id) {
this.id = id;
}
@Basic
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
} }
在hibernate中需要配置 mapping:
<mapping class="entity.TestNoteGrade"/>
还有种生成实体类与映射文件的方法：
反推（用myeclipse来操作）
java 测试代码：
package test4Criteria; import java.util.ArrayList;
import java.util.List;
import java.util.Set; import junit.framework.TestCase;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Projections;
import org.hibernate.criterion.Property;
import org.hibernate.criterion.Restrictions; import entity.Grade;
import entity.Student;
import entity.TrStudent; import util.HibernateUtil; public class Criterion01 extends TestCase{
Session session=null; /**
* critertion 查询
*/
public void testCriterion1(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//查询整个类
List grade=session.createCriteria(Grade.class).list();
for(int i=0;i<grade.size();i++){
Grade gra=(Grade)grade.get(i);
System.out.println(gra); } } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
}
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//查询指定值
List grade=session.createCriteria(Grade.class)//
.add(Restrictions.eq("gradename","一年级"))//
.list();
for(int i=0;i<grade.size();i++){
Grade gra=(Grade)grade.get(i);
System.out.println(gra); } } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
} }
/**
* 比较运算
*/
public void testCriterion2(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//大于条件
List grades=session.createCriteria(Grade.class).add(Restrictions.gt("gradeid", 2)).list(); for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
System.out.println("---大于等于条件--------------------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//大于等于条件
List grades=session.createCriteria(Grade.class).add(Restrictions.ge("gradeid", 2)).list(); for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); } System.out.println("---小于等于条件--------------------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//大于等于条件
List grades=session.createCriteria(Grade.class).add(Restrictions.le("gradeid", 2)).list(); for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
System.out.println("---等于空--------------------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//大于等于条件
List grades=session.createCriteria(Grade.class).add(Restrictions.isNull("gradeid")).list(); for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); } }
/**
* 范围运算
*/
public void testCriterion3(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
Object[] obj={1,2,3};
//in
List grades=session.createCriteria(Grade.class)//
.add(Restrictions.in("gradeid",obj))//
.list();
for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally{
HibernateUtil.closeSession(); }
System.out.println("-----not--in------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
Object[] obj={1,2,3};
//in
List grades=session.createCriteria(Grade.class)//
.add(Restrictions.not(Restrictions.in("gradeid",obj)))//
.list();
for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally{
HibernateUtil.closeSession(); } System.out.println("--not-between- and--");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
Object[] obj={1,2,3};
//in
List grades=session.createCriteria(Grade.class)//
.add(Restrictions.not(Restrictions.between("gradeid",1,3)))//
.list();
for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally{
HibernateUtil.closeSession(); } System.out.println("---between- and--");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
Object[] obj={1,2,3};
//in
List grades=session.createCriteria(Grade.class)//
.add(Restrictions.between("gradeid",1,3))//
.list();
for(int i=0;i<grades.size();i++){
System.out.println((Grade)grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally{
HibernateUtil.closeSession(); }
} /**
* 字符串模式匹配 like ilike
*/
public void testCriterion4(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
String scase="ab";
List student=session.createCriteria(Student.class).add(Restrictions.like("name", "%"+scase+"%")).list();
for(int i=0;i<student.size();i++){
Student stu=(Student)student.get(i);
String name=stu.getName();
System.out.print(name.substring(0, name.indexOf(scase)));
System.err.print(name.substring(name.indexOf(scase),(name.indexOf(scase)+scase.length())));
if(name.indexOf(scase)==name.length()-scase.length()){
System.out.println(""); }
System.out.println(name.substring(name.indexOf(scase)+scase.length(),name.length())); } } catch (Exception e) {
// TODO: handle exception
}finally{
HibernateUtil.closeSession(); }
System.out.println("------ilike----------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
String scase="eli";
List student=session.createCriteria(Student.class).add(Restrictions.ilike("name", "%"+scase+"%")).list();
for(int i=0;i<student.size();i++){
Student stu=(Student)student.get(i);
String name=stu.getName().toLowerCase();
System.out.print(name.substring(0, name.indexOf(scase)));
System.err.print(name.substring(name.indexOf(scase),(name.indexOf(scase)+scase.length())));
if(name.indexOf(scase)==name.length()-scase.length()){
System.out.println(""); }
System.out.println(name.substring(name.indexOf(scase)+scase.length(),name.length())); }
} catch (Exception e) {
// TODO: handle exception
}finally{
HibernateUtil.closeSession(); }
}
/**
* 逻辑运算
*/
public void testCriterion5(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List grades=session.createCriteria(Grade.class).add(Restrictions.and(Restrictions.eq("gradename", "一年级"), Restrictions.le("gradeid", 5))).list();
for(int i=0;i<grades.size();i++){
System.out.println(grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
System.out.println("-------or-----------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List grades=session.createCriteria(Grade.class).add(Restrictions.or(Restrictions.eq("gradename", "一年级"), Restrictions.le("gradeid", 3))).list();
for(int i=0;i<grades.size();i++){
System.out.println(grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
System.out.println("-------not-----------");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List grades=session.createCriteria(Grade.class).add(Restrictions.not(Restrictions.eq("gradename", "一年级"))).list();
for(int i=0;i<grades.size();i++){
System.out.println(grades.get(i)); }
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); } }
/**
* 集合运算
*/
public void testCriterion6(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List grades=session.createCriteria(Grade.class).add(Restrictions.isNotEmpty("stu")).list();
for(int i=0;i<grades.size();i++){
System.out.println(((Grade)grades.get(i)).getStu());
} } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
} /**
* 动态查询
*/
public void testTrends(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
TrStudent tr=new TrStudent();
tr.setName("%eli%");
tr.setStartGrade(1);
tr.setEndGrade(3);
Criteria cri= session.createCriteria(Student.class);
if(tr.getName()!=null){
cri.add(Restrictions.like("name", tr.getName()));
}if(tr.getStartGrade()!=null&&tr.getEndGrade()!=null){
cri.add(Restrictions.between("gradeid",tr.getStartGrade(),tr.getEndGrade())); }if(tr.getStartGrade()!=null&&tr.getEndGrade()==null){
cri.add(Restrictions.ge("gradeid",tr.getStartGrade())); }
if(tr.getStartGrade()==null&&tr.getEndGrade()!=null){
cri.add(Restrictions.le("gradeid",tr.getEndGrade())); }
List student=cri.addOrder(Order.asc("gradeid")).setMaxResults(80).list();
//根据年级排序，每页显示十条
Integer pagesize=10;
Integer page=1;
System.out.println(student.size()/pagesize);
for(int i=0;i<student.size()/pagesize;i++){
System.out.println("--------第 "+page+" 页-------------");
List students=cri.addOrder(Order.asc("gradeid")).setFirstResult(pagesize*(page-1)).setMaxResults(pagesize).list();
page++;
for(int j=0;j<students.size();j++){
System.out.println(students.get(j));
}
System.out.println(page); } } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
} }
/**
* 链接查询
*/
public void testrelevance(){
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List student=session.createCriteria(Student.class).createCriteria("grade").addOrder(Order.asc("gradeid")).setMaxResults(20).list();
for(int i=0;i<student.size();i++){
System.out.println(student.get(i)+"\t"+((Student)student.get(i)).getGrade().getGradename());
} } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
}
System.out.println("---createAlias()查询---");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
List student=session.createCriteria(Student.class,"s").createAlias("grade","g").addOrder(Order.asc("s.gradeid")).setMaxResults(20).list();
for(int i=0;i<student.size();i++){
System.out.println(student.get(i)+"\t"+((Student)student.get(i)).getGrade().getGradename());
} } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
}
} /**
* 投影查询
*/
public void testProj(){
System.out.println("--查询记录总数--");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//查询所有年级名称
Object obj=session.createCriteria(Grade.class)
.setProjection(Projections.projectionList().add(Projections.rowCount()))
.list();
System.out.println("所有班级："+obj); } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
} System.out.println("--查询班级名称--");
try {
session=HibernateUtil.currentSession();
session.beginTransaction();
//查询所有年级名称
Object obj=session.createCriteria(Grade.class)
.setProjection(Projections.projectionList().add(Property.forName("gradename")))
.list();
System.out.println(obj); } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession();
}
} /**
* DetachedCriteria 离线查询
*/
public void testoff_line(){
try {
//这段代码一般放在web产生查询条件
DetachedCriteria det=DetachedCriteria.forClass(Student.class,"s")
.createAlias("s.grade", "g")
.add(Restrictions.eq("g.gradename", "幼儿园")); //数据访问层
session=HibernateUtil.currentSession();
session.beginTransaction();
List students=det.getExecutableCriteria(session).add(Restrictions.ilike("s.name","%yap%")).setMaxResults(50).list();
//打印
for(int i=0;i<students.size();i++){
System.out.println(students.get(i)+"\t"+((Student)students.get(i)).getGrade().getGradename());
} } catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}finally{
HibernateUtil.closeSession(); }
}
/**注解 的效果
* 启动时会在数据库创建一个表
*/
public void testNote(){
try {
AnnotationConfiguration anc=new AnnotationConfiguration().configure();
session=anc.buildSessionFactory().openSession();
session.beginTransaction();
session.getTransaction().commit();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
session.getTransaction().rollback();
}finally{
session.close();
} } }
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