二、具体事例如下：
2.0 编写如下sql语句
1 create table teacher(tid number not null primary key,tname varchar2(20));2 create sequence seq_teacher;3 insert into teacher values(seq_teacher.nextval,'holly');4 insert into teacher values(seq_teacher.nextval,'石头');5 commit;6 insert into teacher values(seq_teacher.nextval,'holly1');7 insert into teacher values(seq_teacher.nextval,'holly2');8 commit;
2.1 创建如下的javaweb项目并添加jar文件
2.2 在项目的src下创建hibernate.cfg.xml主配置文件
1 2 34 5 14oracle.jdbc.driver.OracleDriver 6jdbc:oracle:thin:@127.0.0.1:1521:orcl 7scott 8tiger 9org.hibernate.dialect.Oracle10gDialect 10true 11true 1213
2.3 在项目的com.entity包下创建Teacher.java类
1 package com.entity; 2 3 4 public class Teacher { 5 private int tid; 6 private String tname; 7 8 public Teacher() { 9 }10 11 public Teacher(String tname) {12 this.tname = tname;13 }14 15 public Teacher(int tid, String tname) {16 this.tid = tid;17 this.tname = tname;18 }19 20 public int getTid() {21 return tid;22 }23 24 public void setTid(int tid) {25 this.tid = tid;26 }27 28 public String getTname() {29 return tname;30 }31 32 public void setTname(String tname) {33 this.tname = tname;34 }35 36 @Override37 public String toString() {38 return "Teacher [tid=" + tid + ", tname=" + tname + "]";39 }40 41 42 43 }
2.4 在项目的com.entity包下创建Teacher.hbm.xm文件
1 2 34 5 126 107 seq_teacher 8 911
2.5 在项目的com.util包下创建HibernateUtil.java类
1 package com.util; 2 3 import org.hibernate.HibernateException; 4 import org.hibernate.Session; 5 import org.hibernate.SessionFactory; 6 import org.hibernate.cfg.Configuration; 7 8 public class HibernateUtil { 9 private static ThreadLocal thread=new ThreadLocal ();10 private static Configuration config=null;11 private static SessionFactory factory=null;12 13 static{14 try {15 config=new Configuration().configure("/hibernate.cfg.xml");16 factory=config.buildSessionFactory();17 } catch (HibernateException e) {18 System.out.println("读取配置文件或创建工厂失败");19 e.printStackTrace();20 }21 }22 23 public static Session getSession(){24 Session session =thread.get();25 if(session==null){26 session =factory.openSession();27 thread.set(session);28 }29 return session;30 }31 public static void closeSession(){32 Session session =thread.get();33 thread.set(null);34 session.close();35 36 }37 38 }
2.6 在项目的com.dao包下创建TeacherDao.java类
1 package com.dao; 2 3 import java.util.Iterator; 4 import java.util.List; 5 6 import org.hibernate.Query; 7 import org.hibernate.Session; 8 9 import com.entity.Teacher; 10 import com.util.HibernateUtil; 11 12 public class TeacherDao { 13 /** 14 * 1.iterate() 延时加载查询一堆 15 * 得到1+N条sql 16 * 1是查询所有的sql 17 * n根据id查询的n条sql 18 * 延迟加载(用时在查询),关闭session的时机是读取完数据之后再关闭 19 */ 20 public static Iterator hqlItertor() { 21 Session session=HibernateUtil.getSession(); 22 //定义hql语句 23 String hql="from Teacher"; 24 25 //创建Query查询接口对象 26 Query query=session.createQuery(hql); 27 28 //使用list方法查询所有返回list集合 29 Iterator it=query.iterate(); 30 31 32 return it; 33 } 34 /** 35 * 2. list()立即加载 36 * 一条sql 37 * 立即加载(一次性查询出所有内容(关联)放入内存) 38 * 39 */ 40 public static List hqlList() { 41 Session session=HibernateUtil.getSession(); 42 //定义hql语句 43 String hql="from Teacher"; 44 45 //创建Query查询接口对象 46 Query query=session.createQuery(hql); 47 48 //使用list方法查询所有返回list集合 49 List list=query.list(); 50 51 52 HibernateUtil.closeSession(); 53 return list; 54 55 } 56 /** 57 * 3.根据条件查询返回集合 58 * @param tname 59 * @return 60 */ 61 public static List hqlIf(String tname) { 62 Session session=HibernateUtil.getSession(); 63 //定义hql语句 64 String hql="from Teacher where tname='"+tname+"'"; 65 66 //创建Query查询接口对象 67 Query query=session.createQuery(hql); 68 69 //使用list方法查询所有返回list集合 70 List list=query.list(); 71 72 73 HibernateUtil.closeSession(); 74 return list; 75 } 76 /** 77 * 4. 占位符的使用(模糊查询) 78 * @param string 79 * @return 80 */ 81 public static List hqlLike(String name) { 82 Session session=HibernateUtil.getSession(); 83 //定义hql语句 84 String hql="from Teacher where tname like ?"; 85 86 //创建Query查询接口对象 87 Query query=session.createQuery(hql); 88 String str="%"+name+"%"; 89 query.setString(0, str); 90 91 //使用list方法查询所有返回list集合 92 List list=query.list(); 93 94 95 HibernateUtil.closeSession(); 96 return list; 97 } 98 /** 99 * 5. 按照参数名称使用(模糊查询)100 * @param string101 * @return102 */103 public static List hqlLikeName(String name) {104 Session session=HibernateUtil.getSession();105 //定义hql语句106 String hql="from Teacher where tname like :pname";107 108 //创建Query查询接口对象109 Query query=session.createQuery(hql);110 String str="%"+name+"%";111 query.setString("pname", str);112 113 //使用list方法查询所有返回list集合114 List list=query.list();115 116 117 HibernateUtil.closeSession();118 return list;119 }120 /**121 * 6. 条件查询绑定任意类型的参数:命名参数122 * @param string123 * @return124 */125 public static List hqlSetParam(String name) {126 Session session=HibernateUtil.getSession();127 //定义hql语句128 String hql="from Teacher where tname like :pname";129 130 //创建Query查询接口对象131 Query query=session.createQuery(hql);132 String str="%"+name+"%";133 134 query.setParameter("pname", str);135 136 //使用list方法查询所有返回list集合137 List list=query.list();138 139 140 HibernateUtil.closeSession();141 return list;142 }143 /**144 * 7. 条件查询绑定任意类型的参数:占位符145 * @param string146 * @return147 */148 public static List hqlSetParamXx(String name) {149 Session session=HibernateUtil.getSession();150 //定义hql语句151 String hql="from Teacher where tname like ?";152 153 //创建Query查询接口对象154 Query query=session.createQuery(hql);155 String str="%"+name+"%";156 157 query.setParameter(0, str);158 159 //使用list方法查询所有返回list集合160 List list=query.list();161 162 163 HibernateUtil.closeSession();164 return list;165 }166 167 168 /**169 * 8.条件动态:通过对象属性去给命名参数赋值170 * @param name171 * @return172 */173 public static List hqlSetProte(Teacher teacher) {174 175 Session session=HibernateUtil.getSession();176 //定义hql语句177 StringBuilder hql=new StringBuilder("from Teacher as t where 1=1");178 179 if(teacher.getTname()!=null){180 hql.append(" and t.tname=:tname");181 }182 183 //创建Query查询接口对象184 Query query=session.createQuery(hql.toString());185 query.setProperties(teacher);186 187 //使用list方法查询所有返回list集合188 List list=query.list();189 190 HibernateUtil.closeSession();191 return list;192 }193 /**194 * 9.查询单条数据195 * @return196 */197 public static Teacher hhqlGetTeacher(String name) {198 Session session=HibernateUtil.getSession();199 //定义hql语句200 String hql="from Teacher where tname=:pname";201 202 203 //创建Query查询接口对象204 Query query=session.createQuery(hql.toString());205 query.setParameter("pname", name);206 207 //使用208 Teacher teacher=(Teacher) query.uniqueResult();209 210 HibernateUtil.closeSession();211 return teacher;212 }213 /**214 * 10. 分页查询215 * @param i216 * @param j217 * @return218 */219 public static List hqlPage(int pageSize, int pageNo) {220 Session session=HibernateUtil.getSession();221 222 //1.获取中条数223 //定义中条数的hql语句224 String hqlcount="select count(*) from Teacher";225 Query countQuery=session.createQuery(hqlcount);226 227 //uniqueResult()得到总条数228 Integer totalCount=Integer.parseInt(countQuery.uniqueResult().toString());229 System.out.println("总条数:"+totalCount);230 231 //2.计算总页数232 int totalPage=totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+1;233 System.out.println("总页数:"+totalPage);234 235 //3.查询的最大记录数(每页查询几条)236 String hql="from Teacher";237 Query query=session.createQuery(hql);238 239 query.setMaxResults(pageSize);240 241 //4.确定查询查询的起点242 query.setFirstResult((pageNo-1)*pageSize);243 244 //5.查询分页数据245 List list=query.list();246 HibernateUtil.closeSession();247 return list;248 }249 }
2.7 在项目的com.test包下创建Test.java类
1 package com.test; 2 3 import java.util.Iterator; 4 import java.util.List; 5 6 import com.dao.TeacherDao; 7 import com.entity.Teacher; 8 import com.util.HibernateUtil; 9 10 public class Test {11 12 public static void main(String[] args) {13 // System.out.println("--------------1.使用list查询所有-----------");14 // List list=TeacherDao.hqlList();15 // for (Teacher teacher : list) {16 // System.out.println(teacher);17 // }18 // System.out.println("--------------2.使用Itertor查询所有-----------");19 // Iterator it=TeacherDao.hqlItertor();20 // Teacher te=null;21 // while (it.hasNext()) {22 // te=it.next();23 // System.out.println(te);24 // }25 // HibernateUtil.closeSession();26 // 27 // System.out.println("----------3.条件拼接查询-----------");28 // List iflist=TeacherDao.hqlIf("holly");29 // for (Teacher teacher : iflist) {30 // System.out.println(teacher);31 // }32 // 33 // System.out.println("----------4.条件查询模糊查询:按照参数位置-----------");34 // List likelist=TeacherDao.hqlLike("holly");35 // for (Teacher teacher : likelist) {36 // System.out.println(teacher);37 // }38 // System.out.println("----------5.条件查询模糊查询:按照名称-----------");39 // List likeNamelist=TeacherDao.hqlLikeName("holly");40 // for (Teacher teacher : likeNamelist) {41 // System.out.println(teacher);42 // }43 44 // System.out.println("----------6.条件查询绑定任意类型的参数-----------");45 // List SetParamlist=TeacherDao.hqlSetParam("holly");46 // for (Teacher teacher : SetParamlist) {47 // System.out.println(teacher);48 // }49 // System.out.println("----------7.条件查询绑定任意类型的参数:占位符-----------");50 // List SetParamXx=TeacherDao.hqlSetParamXx("holly");51 // for (Teacher teacher : SetParamXx) {52 // System.out.println(teacher);53 // }54 System.out.println("----------8.条件动态:命名参数-----------");55 // Teacher te=new Teacher("holly");56 // List SetProte=TeacherDao.hqlSetProte(te);57 // for (Teacher teacher : SetProte) {58 // System.out.println(teacher);59 // }60 61 System.out.println("------------9.查询单条数据-----------");62 // Teacher teacher=TeacherDao.hhqlGetTeacher("holly");63 // System.out.println(teacher);64 65 System.out.println("---------10.分页查询------------");66 List list=TeacherDao.hqlPage(2,2);67 System.out.println("页面大小:"+2+",当前页:"+2);68 for (Teacher teacher : list) {69 System.out.println(teacher);70 }71 72 73 74 }75 76 } 2.8 效果自己试试就知道