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Hibernate(四)

==================================投影（查询）=============================
投影查询：查询一个持久化类的一个或多个属性值
   1.将每条查询结果封装成Object对象
   2.将每条查询结果封装成Object数组
   3.将每条查询结果通过构造函数封装成对象

范例1：java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.Elastic.HibernateDemo3.ivy.entity.Dept
      [L：数组

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 9 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
10 public class Test {
11     public static void main(String[] args) {
12         Session session = HibernateUtil.getSession();
13         
14         String hql = "select deptName,location from Dept";
15         
16         Query query = session.createQuery(hql);
17         
18         //2.将每条查询结果封装成Object数组
19         List<Dept> depts = query.list();
20         for (Dept dept : depts) {
21             System.out.println(dept.getDeptName());
22         }
23     }
24 }

范例2： Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: expecting OPEN, found '[' near line 1, column 16 [select new Dept[deptName,location] from com.Elastic.HibernateDemo3.ivy.entity.Dept]

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 9 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
10 public class Test {
11     public static void main(String[] args) {
12         Session session = HibernateUtil.getSession();
13         
14         //3.将每条查询结果通过构造函数封装成对象
15         String hql = "select new Dept[deptName,location] from Dept";
16         
17         Query query = session.createQuery(hql);
18         
19         List<Dept> depts = query.list();
20         for (Dept dept : depts) {
21             System.out.println(dept.getDeptName());
22         }
23     }
24 }

范例3：Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: expecting OPEN, found '[' near line 1, column 16 [select new Dept[deptName,location] from com.Elastic.HibernateDemo3.ivy.entity.Dept]

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 9 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
10 public class Test {
11     public static void main(String[] args) {
12         Session session = HibernateUtil.getSession();
13         
14         String hql = "select new Dept[deptName,location] from Dept";
15         
16         Query query = session.createQuery(hql);
17         
18         //2.将每条查询结果封装成Object数组
19         <Object> objs = query.list();
20         for (Object object : objs) {
21             System.out.println(object);
22         }
23     }
24 }

范例4：Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: expecting OPEN, found '[' near line 1, column 16 [select new Dept[deptName,location] from com.Elastic.HibernateDemo3.ivy.entity.Dept]

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 9 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
10 public class Test {
11     public static void main(String[] args) {
12         Session session = HibernateUtil.getSession();
13         //将每条查询结果封装成Object数组与将每条查询结果通过构造函数封装成对象只能选其一？？？
14         String hql = "select new Dept[deptName,location] from Dept";
15         Query query = session.createQuery(hql);
16         List<Object[]> depts = query.list();
17         for (Object[] objects : depts) {
18             System.out.println(objects[0].toString() + objects[1]);
19         }
20     }
21 }

正确范例：

 1 import java.util.HashMap;
 2 import java.util.List;
 3 import java.util.Map;
 4 import org.hibernate.Query;
 5 import org.hibernate.SQLQuery;
 6 import org.hibernate.Session;
 7 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 8 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
 9 public class Test {
10     public static void main(String[] args) {
11         Session session = HibernateUtil.getSession();
12         String hql = "select deptName,location from Dept";
13         Query query = session.createQuery(hql);
14         List<Object[]> depts = query.list();
15         for (Object[] objects : depts) {
16             System.out.println(objects[0].toString() + objects[1]);
17         }
18     }
19 }

========================================分页查询===============================================
范例：

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
10 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
11 public class Test {
12     public static void main(String[] args) {
13         Session session = HibernateUtil.getSession();
14         String hql = "from Dept";
15         Query query = session.createQuery(hql);
16         
17         //当前页码
18         int pageIndex = 1;
19         //每页显示的条数
20         int pageSize = 2;
21         
22         //设置查询的起始位置
23         query.setFirstResult((pageIndex - 1) * pageSize);
24         //设置每页查询的（最大）条数
25         query.setMaxResults(pageSize);
26         
27         List<Dept> depts = query.list();
28         for (Dept dept : depts) {
29             System.out.println(dept.getDeptName());
30         }
31     }
32 }

==================================连接查询==============================
内联：只显示互相有值的两表

左外联：左边全部显示，右边null

右外联：右边全部显示，左边null

连接类型               HQL语法
内连接               inner join 或 join
迫切内连接           inner join fetch或 join fetch
左外连接              left outer join或 left join
迫切左外连接       left outer join fetch或 left join fetch
右外连接           right outer join 或right join

注意：配置文件中的fetch属性效果不大，所以一般不在配置文件中使用这个属性。而是在业务有需求时，才在业务中使用

范例：Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.Elastic.HibernateDemo3.ivy.entity.Emp
      迫切连接？？？

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
10 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
11 public class Test {
12     public static void main(String[] args) {
13         Session session = HibernateUtil.getSession();
14         String hql = "from Emp emp inner join emp.dept";
15         List<Emp> emps = session.createQuery(hql).list();
16         for (Emp emp : emps) {
17             System.out.println(emp.getEmpName() + emp.getDept().getDeptName());
18         }
19     }
20 }

正确范例：

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
10 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
11 public class Test {
12     public static void main(String[] args) {
13         Session session = HibernateUtil.getSession();
14         String hql = "from Emp emp inner join emp.dept";
15         List<Emp> emps = session.createQuery(hql).list();
16         for (Emp emp : emps) {
17             System.out.println(emp.getEmpName() + emp.getDept().getDeptName());
18         }
19     }
20 }

===================================子查询================================
子查询语句：应用在HQL查询语句的where子句中

关键字              说明
all               返回的所有记录
any              返回的任意一条记录
some            和“any”意思相同
in               与“=any”意思相同
exists           至少返回一条记录

范例：
a.查询所有员工工资都小于5000的部门
from Dept d where d.emps.size>0 and
5000>all(select e.salary from d.emps e)

b.查询至少有一位员工工资低于5000的部门
from Dept d where 5000>any(select e.salary from d.emps e)

c.查询员工工资正好是5000元的部门
from Dept d where 5000=any(select e.salary from d.emps e)
from Dept d where 5000=some(select e.salary from d.emps e)

d.查询至少有一位员工的部门
from Dept d where exists (from d.emps)
【技巧：size和exists可以表达一件事，优先考虑exists（效率高）】

====================================原生SQL查询================================
HQL 不能"统计"
SQL   提高性能，有相应数据库的优化语法

原生SQL查询：使用底层数据库的SQL特性，来生成一些特殊的查询语句

Hibernate使用★Session的createSQLQuery()方法创建SQLQuery对象★，用来执行原生SQL语句

范例1：

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
10 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
11 public class Test {
12     public static void main(String[] args) {
13         Session session = HibernateUtil.getSession();
14         //直接创建SQL
15         String sql = "select e.*,d.* from emp e inner join dept d on e.deptId = d.deptId";
16         
17         //创建SQLQuery对象，命名查询createSQLQuery()
18         SQLQuery sqlQuery = session.createSQLQuery(sql);
19         sqlQuery.addEntity(Emp.class);
20         
21         List<Emp> emps = sqlQuery.list();
22         for (Emp emp : emps) {
23             System.out.println(emp.getEmpName() + emp.getDept().getDeptName());
24         }
25         
26         //'：name' 相当 SQL语句中的 '?'。其他like等语法HQL一样用
27         Query query = session
28             .createSQLQuery(
29             "select * from Emp where empName like :ename and Job = :job")
30             .addEntity(Emp.class).setString("ename", "%张%")
31             .setString("job", "工程师");
32         List<Emp> list = query.list();
33     }
34 }

=================================命名查询=========================
命名查询语句：在映射文件中定义★字符串形式★的查询语句

HQL查询语句的命名查询，存在★***.hbm.xml★

HQL命名查询
SQL命名查询

【技巧：表单传入两个值name和value。所以命名时，用Map做】

范例1：

 1 <hibernate-mapping>
 2     <class name="com.xuetang9.demo.entity.Emp" table="emp">
 3         ......
 4     </class>
 5     <query name="findEmpByJob">
 6     <![CDATA[
 7         from Emp e where e.job = :job
 8     ]]>
 9     </query>
10 </hibernate-mapping>

范例2：
1.Emp.hbm.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">   
 5 <hibernate-mapping>
 6     <!-- 实体类路径：数据库表名-->
 7     <class name="com.Elastic.HibernateDemo3.ivy.entity.Emp" table="emp">
 8     
 9         <!-- 主键UID(唯一标识) -->
10         <id name="empNo" column="empNo"><!-- column单独一行，属性更全 -->
11         
12             <!-- 主键生成策略：increment，assigned，native等 -->
13             <generator class="increment"></generator>
14         </id>
15         
16         <!-- 属性名（★★setDeptName★★）：数据库表字段(如果是关键字，用``标志) -->
17         <property name="empName" column="empName"></property>
18         
19         <!-- 这个字段进行新增和修改功能，要被Hibernate忽略。因为，与外键一样 -->
20         <property name="deptId" column="deptId" insert="false" update="false"></property>
21         
22         
23         <!-- 多对一的关系（多个员工属于一个部门） -->
24         <many-to-one name="dept" class="com.Elastic.HibernateDemo3.ivy.entity.Dept" column="deptId" lazy="proxy"></many-to-one>
25         <!-- fetch存在，懒加载没用。fetch不放在配置文件中 -->
26     
27     </class>
28     
29     <!-- 配置HQL命名查询 -->
30     <query name="findEmpByDeptName">
31         <!-- 文本 -->
32         <![CDATA[
33             from Emp e where e.dept.deptName = :deptname and e.empName = :ename
34         ]]>
35     </query>
36     
37     <!-- 配置原生的SQL语句 -->
38     <sql-query name="findEmp">
39         <return alias="e" class="com.Elastic.HibernateDemo3.ivy.entity.Emp"></return>
40         select * from emp e inner join dept d on e.deptId = d.deptId where e.empName = :ename and d.deptName = :deptname
41     </sql-query>
42 </hibernate-mapping>

2.Test类

 1 package com.Elastic.HibernateDemo3.ivy.test;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import org.hibernate.Query;
 6 import org.hibernate.SQLQuery;
 7 import org.hibernate.Session;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
10 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
11 public class Test {
12     public static void main(String[] args) {
13         String name = "findEmp";
14         //String name = "findEmpByDeptName";
15         Map<String, Object> params = new HashMap<String, Object>();
16         params.put("deptname", "销售部");
17         params.put("ename", "李四");
18         
19         Session session = HibernateUtil.getSession();
20         Query query = session.getNamedQuery(name);
21         query.setProperties(params);
22         List<Emp> emps = query.list();
23         for (Emp emp : emps) {
24             System.out.println(emp.getEmpName() + emp.getDept().getDeptName());
25         }
26     }
27 }

=================================综合范例==============================
1.实体类及其hbm.xml文件 -- entity包
a.Dept

 1 package com.Elastic.HibernateDemo3.ivy.entity;
 2 import java.io.Serializable;
 3 import java.util.Set;
 4 public class Dept implements Serializable {
 5     private static final long serialVersionUID = 2261199233032137882L;
 6     private Integer deptId;
 7     private String deptName;
 8     private String location;
 9     
10     //多对一：一个部门有多个员工
11     //set：唯一
12     private Set<Emp> emps;
13     
14     public Set<Emp> getEmps() {
15         return emps;
16     }
17     public void setEmps(Set<Emp> emps) {
18         this.emps = emps;
19     }
20 
21     public Integer getDeptId() {
22         return deptId;
23     }
24     public void setDeptId(Integer deptId) {
25         this.deptId = deptId;
26     }
27     public String getDeptName() {
28         return deptName;
29     }
30     public void setDeptName(String deptName) {
31         this.deptName = deptName;
32     }
33     public String getLocation() {
34         return location;
35     }
36     public void setLocation(String location) {
37         this.location = location;
38     }
39 }

b.Dept.hbm.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5     
 6 <hibernate-mapping>
 7     <!-- 实体类路径：数据库表名-->
 8     <class name="com.Elastic.HibernateDemo3.ivy.entity.Dept" table="dept">
 9         <!-- 主键OID(唯一标识) -->
10         <id name="deptId" column="deptid"><!-- column单独一行，属性更全 -->
11             <!-- 主键生成策略：increment，assigned，native等 -->
12             <generator class="increment"></generator>
13         </id>
14         
15         <!-- 属性名（★★setDeptName★★）：数据库表字段(如果是关键字，用``标志) -->
16         <property name="deptName" column="deptname"></property>
17         <property name="location" column="location"></property>
18         
19         <!-- 多个员工 -->
20         <!-- <set name="emps" cascade="save-update"> --><!-- 新增部门的同时，新增员工（级联操作） -->
21         <!-- <set name="emps" cascade="all" inverse="true" order-by="empNo desc"> --><!-- 删除部门同时删除员工 -->
22         <set name="emps" cascade="all" inverse="true" order-by="empNo desc" lazy="extra"><!-- 删除部门同时删除员工
23             表dept中deptid -->
24             <key column="deptid"></key>
25             <one-to-many class="com.Elastic.HibernateDemo3.ivy.entity.Emp"></one-to-many>
26         </set>
27         
28     </class>
29 </hibernate-mapping>

a1.Emp

 1 package com.Elastic.HibernateDemo3.ivy.entity;
 2 import java.io.Serializable;
 3 public class Emp implements Serializable {
 4     /**
 5      * <p>
 6      * <h3>作用：</h3>
 7      * </p>
 8      * @see long
 9      * @see serialVersionUID
10      */
11     private static final long serialVersionUID = -6182713107749938132L;
12     private Integer empNo;
13     private String empName;
14     private Integer deptId;
15     
16     private Dept dept;
17     
18     public Integer getDeptId() {
19         return deptId;
20     }
21     public void setDeptId(Integer deptId) {
22         this.deptId = deptId;
23     }
24     public Dept getDept() {
25         return dept;
26     }
27     public void setDept(Dept dept) {
28         this.dept = dept;
29     }
30     public Integer getEmpNo() {
31         return empNo;
32     }
33     public void setEmpNo(Integer empNo) {
34         this.empNo = empNo;
35     }
36     public String getEmpName() {
37         return empName;
38     }
39     public void setEmpName(String empName) {
40         this.empName = empName;
41     }
42 }

b1.Emp.hbm.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6     <!-- 实体类路径：数据库表名-->
 7     <class name="com.Elastic.HibernateDemo3.ivy.entity.Emp" table="emp">
 8     
 9         <!-- 主键UID(唯一标识) -->
10         <id name="empNo" column="empNo"><!-- column单独一行，属性更全 -->
11         
12             <!-- 主键生成策略：increment，assigned，native等 -->
13             <generator class="increment"></generator>
14         </id>
15         
16         <!-- 属性名（★★setDeptName★★）：数据库表字段(如果是关键字，用``标志) -->
17         <property name="empName" column="empName"></property>
18         
19         <!-- 这个字段进行新增和修改功能，要被Hibernate忽略。因为，与外键一样 -->
20         <property name="deptId" column="deptId" insert="false" update="false"></property>
21         
22         
23         <!-- 多对一的关系（多个员工属于一个部门） -->
24         <many-to-one name="dept" class="com.Elastic.HibernateDemo3.ivy.entity.Dept" column="deptId" lazy="proxy"></many-to-one>
25         <!-- fetch存在，懒加载没用。fetch不放在配置文件中 -->
26     
27     </class>
28     
29     <!-- 配置HQL命名查询 -->
30     <query name="findEmpByDeptName">
31         <!-- 文本 -->
32         <![CDATA[
33             from Emp e where e.dept.deptName = :deptname and e.empName = :ename
34         ]]>
35     </query>
36     
37     <!-- 配置原生的SQL语句 -->
38     <sql-query name="findEmp">
39         <return alias="e" class="com.Elastic.HibernateDemo3.ivy.entity.Emp"></return>
40         
41         select * from emp e inner join dept d on e.deptId = d.deptId where e.empName = :ename and d.deptName = :deptname
42     </sql-query>
43 </hibernate-mapping>

2.hibernate.cfg.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 
 3 <!DOCTYPE hibernate-configuration PUBLIC
 4     "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 5     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 6 
 7 <hibernate-configuration>
 8     <session-factory>
 9         <!-- 1.连接数据库 -->
10         <!-- 连接数据库名 -->
11         <property name="connection.url">jdbc:mysql://localhost:3306/hibernatedb</property>
12         
13         <!-- 连接数据库的用户名 -->
14         <property name="connection.username">root</property>
15         
16         <!-- 连接数据库的密码 -->
17         <property name="connection.password">root</property>
18         
19         <!-- 数据库驱动类 -->
20         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
21         
22         <!-- 2.数据库方言（不同的数据库） -->
23         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
24         
25         <!-- 3.其他属性 -->
26         <!-- 是否显示sql语句 -->
27         <property name="show_sql">true</property>
28         <!-- 是否显示格式化sql语句，如果要显示，★★★一定要先显示show_sql语句★★★ -->
29         <property name="format_sql">true</property>
30         
31         <!-- 4.数据库对应的实体类的映射文件路径 -->
32         <mapping resource="com/Elastic/HibernateDemo3/ivy/entity/Dept.hbm.xml"></mapping>
33         <mapping resource="com/Elastic/HibernateDemo3/ivy/entity/Emp.hbm.xml"></mapping>
34     </session-factory>
35 </hibernate-configuration>

3.util包：HibernateUtil

 1 package com.Elastic.HibernateDemo3.ivy.util;
 2 import org.hibernate.Session;
 3 import org.hibernate.SessionFactory;
 4 import org.hibernate.cfg.Configuration;
 5 public final class HibernateUtil {
 6     private static Configuration cfg = null;
 7     private static SessionFactory sessionFactory = null;
 8     
 9     //本地线程
10     public static ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
11     
12     static{
13         cfg = new Configuration().configure();
14         sessionFactory = cfg.buildSessionFactory();
15     }
16     
17     public static Session getSession(){
18         Session session = threadLocal.get();
19         if (null == session || !session.isOpen()) {
20             session = sessionFactory.openSession();
21             threadLocal.set(session);
22         }
23         return session;
24     }
25 }

4.filter包
a.EncodingFilter

 1 package com.Elastic.HibernateDemo3.ivy.filter;
 2 import java.io.IOException;
 3 import javax.servlet.Filter;
 4 import javax.servlet.FilterChain;
 5 import javax.servlet.FilterConfig;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.ServletRequest;
 8 import javax.servlet.ServletResponse;
 9 public class EncodingFilter implements Filter {
10 
11     /* (non-Javadoc)
12      * @see javax.servlet.Filter#destroy()
13      */
14     @Override
15     public void destroy() {
16         // TODO Auto-generated method stub
17 
18     }
19 
20     /* (non-Javadoc)
21      * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
22      */
23     @Override
24     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
25             throws IOException, ServletException {
26         request.setCharacterEncoding("utf-8");
27         response.setCharacterEncoding("utf-8");
28         chain.doFilter(request, response);
29     }
30 
31     /* (non-Javadoc)
32      * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
33      */
34     @Override
35     public void init(FilterConfig arg0) throws ServletException {
36         // TODO Auto-generated method stub
37 
38     }
39 }

b.OpenSessionInViewFilter

 1 package com.Elastic.HibernateDemo3.ivy.filter;
 2 import java.io.IOException;
 3 import javax.servlet.Filter;
 4 import javax.servlet.FilterChain;
 5 import javax.servlet.FilterConfig;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.ServletRequest;
 8 import javax.servlet.ServletResponse;
 9 import org.hibernate.HibernateException;
10 import org.hibernate.Session;
11 import org.hibernate.Transaction;
12 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
13 public class OpenSessionInViewFilter implements Filter{
14 
15     /* (non-Javadoc)
16      * @see javax.servlet.Filter#destroy()
17      */
18     @Override
19     public void destroy() {
20         // TODO Auto-generated method stub
21         
22     }
23 
24     /* (non-Javadoc)
25      * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
26      */
27     @Override
28     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
29             throws IOException, ServletException {
30         
31         /*  事务以及session的关闭    */
32         
33         //获取session
34         Session session = HibernateUtil.getSession();
35         //开启事务
36         Transaction tx = session.beginTransaction();
37         
38         try {
39             chain.doFilter(request, response);
40             //提交事务
41             tx.commit();
42         } catch (HibernateException e) {
43             tx.rollback();
44             e.printStackTrace();
45         } finally {
46             //关闭session
47             session.close();
48         }
49     }
50 
51     /* (non-Javadoc)
52      * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
53      */
54     @Override
55     public void init(FilterConfig arg0) throws ServletException {
56         // TODO Auto-generated method stub
57         
58     }
59 }

5.dao包
a.IBaseDao

 1 package com.Elastic.HibernateDemo3.ivy.dao;
 2 import java.io.Serializable;
 3 import java.util.List;
 4 import java.util.Map;
 5 import com.Elastic.HibernateDemo3.ivy.common.PageList;
 6 public interface IBaseDao<T> {
 7     void save(T record);
 8     
 9     //不明确id的类型，就用Serializable
10     void delete(Serializable id);
11     
12     void update(T record);
13     
14     T findById(Serializable id);
15     
16     List<T> find(Map<String, Object> params);
17     
18     List<T> find(String hql,Map<String, Object> params);
19     
20     PageList<T> findByPage(int pageIndex, int pageSize, Map<String, Object> params);
21     
22     List<T> findByNamed(String queryName, Map<String, Object> params);
23 }

b.BaseDao

  1 package com.Elastic.HibernateDemo3.ivy.dao;
  2 import java.io.Serializable;
  3 import java.lang.reflect.ParameterizedType;
  4 import java.util.List;
  5 import java.util.Map;
  6 import org.hibernate.Query;
  7 import org.hibernate.Session;
  8 import com.Elastic.HibernateDemo3.ivy.common.PageList;
  9 import com.Elastic.HibernateDemo3.ivy.util.HibernateUtil;
 10 
 11 //忽略警告
 12 @SuppressWarnings({ "rawtypes", "unchecked" })
 13 public class BaseDao<T> implements IBaseDao<T>{
 14     
 15     private Class entityClass;
 16     
 17     public BaseDao(){
 18         entityClass = this.getEntityClass();
 19     }
 20     
 21     /**
 22      *
 23      * <p>
 24      * <h3>方法功能描述：根据反射得到实体类的类型</h3>
 25      * </p>
 26      * @return
 27      * @procedure 执行过程
 28      * @see BaseDao
 29      */
 30     private Class getEntityClass(){
 31         try {
 32             ParameterizedType paramsType = (ParameterizedType)this.getClass().getGenericSuperclass();
 33             return (Class)paramsType.getActualTypeArguments()[0];
 34         } catch (Exception e) {
 35             e.printStackTrace();
 36         }
 37         return null;
 38     }
 39     
 40     public Session getSession(){
 41         return HibernateUtil.getSession();
 42     }
 43     
 44     @Override
 45     public void save(T record){
 46         this.getSession().save(record);
 47     }
 48     
 49     @Override
 50     public void delete(Serializable id){
 51         this.getSession().delete(this.findById(id));
 52     }
 53     
 54     @Override
 55     public void update(T record){
 56         this.getSession().update(record);
 57     }
 58     
 59     
 60     @Override
 61     public T findById(Serializable id){
 62         return (T)this.getSession().get(entityClass, id);
 63     }
 64     
 65     @Override
 66     public List<T> find(Map<String, Object> params){
 67         StringBuffer hql = new StringBuffer("from ");
 68         hql.append(entityClass.getName());
 69         hql.append(" where 1 = 1 ");
 70         if (null != params) {
 71             for (String key : params.keySet()) {
 72                 hql.append(" and ");
 73                 hql.append(key);
 74                 hql.append(" = :");
 75                 hql.append(key);
 76             }
 77         }
 78         Query query = this.getSession().createQuery(hql.toString());
 79         if (null != params) {
 80             query.setProperties(params);
 81         }
 82         return query.list();
 83     }
 84 
 85     @Override
 86     public List<T> find(String hql, Map<String, Object> params) {
 87         Query query = this.getSession().createQuery(hql.toString());
 88         if (null != params) {
 89             query.setProperties(params);
 90         }
 91         return query.list();
 92     }
 93 
 94     @Override
 95     public PageList<T> findByPage(int pageIndex, int pageSize, Map<String, Object> params) {
 96         StringBuffer hql = new StringBuffer("from ");
 97         hql.append(entityClass.getName());
 98         hql.append(" where 1 = 1 ");
 99         if (null != params) {
100             for (String key : params.keySet()) {
101                 hql.append(" and ");
102                 hql.append(key);
103                 hql.append(" = :");
104                 hql.append(key);
105             }
106         }
107         Query query = this.getSession().createQuery(hql.toString());
108         if (null != params) {
109             query.setProperties(params);
110         }
111         
112         //查询总条数
113         Query queryTotal = this.getSession().createQuery("select count(*)" + hql.toString());
114         if (null != params) {
115             queryTotal.setProperties(params);
116         }
117         int total = Integer.parseInt(queryTotal.uniqueResult().toString());
118         
119         //设置分页
120         query.setFirstResult((pageIndex - 1) * pageSize);
121         query.setMaxResults(pageSize);
122         return new PageList<T>(query.list(), pageIndex, pageSize, total);
123     }
124 
125     /* (non-Javadoc)
126      * @see com.Elastic.HibernateDemo3.ivy.dao.IBaseDao#findByNamed(java.lang.String, java.util.Map)
127      */
128     @Override
129     public List<T> findByNamed(String queryName, Map<String, Object> params) {
130         Query query = this.getSession().getNamedQuery(queryName);
131         return query.setProperties(params).list();
132     }
133 }

c.DeptDao

1 package com.Elastic.HibernateDemo3.ivy.dao;
2 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
3 public interface DeptDao extends IBaseDao<Dept>{
4 
5 }

d.EmpDao

1 package com.Elastic.HibernateDemo3.ivy.dao;
2 import java.util.List;
3 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
4 public interface EmpDao extends IBaseDao<Emp> {
5     List<Emp> findEmp();
6 }

6.dao.impl包
a.DeptDaoImpl

1 package com.Elastic.HibernateDemo3.ivy.dao.impl;
2 import com.Elastic.HibernateDemo3.ivy.dao.BaseDao;
3 import com.Elastic.HibernateDemo3.ivy.dao.DeptDao;
4 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
5 public class DeptDaoImpl extends BaseDao<Dept> implements DeptDao {
6 
7 }

b.EmpDaoImpl

 1 package com.Elastic.HibernateDemo3.ivy.dao.impl;
 2 import java.io.Serializable;
 3 import java.util.List;
 4 import java.util.Map;
 5 import com.Elastic.HibernateDemo3.ivy.dao.BaseDao;
 6 import com.Elastic.HibernateDemo3.ivy.dao.EmpDao;
 7 import com.Elastic.HibernateDemo3.ivy.entity.Emp;
 8 public class EmpDaoImpl extends BaseDao<Emp> implements EmpDao {
 9 
10     /* (non-Javadoc)
11      * @see com.Elastic.HibernateDemo3.ivy.dao.EmpDao#findEmp()
12      */
13     @Override
14     public List<Emp> findEmp() {
15         this.getSession().getNamedQuery("findEmp"); //配置文件中命名查询的name值
16         return null;
17     }
18 }

7.service包
a.DeptService

 1 package com.Elastic.HibernateDemo3.ivy.service;
 2 import java.util.List;
 3 import java.util.Map;
 4 import com.Elastic.HibernateDemo3.ivy.common.PageList;
 5 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 6 public interface DeptService{
 7     List<Dept> searchALLDept();
 8     
 9     List<Dept> searchDeptsByName(String name);
10     
11     List<Dept> searchDeptByCondition(Map<String, Object> condition);
12     
13     PageList<Dept> searchDeptByPage(int pageIndex, int pageSize, Map<String, Object> condition);
14 }

8.service.impl包
a.DeptServiceImpl

 1 package com.Elastic.HibernateDemo3.ivy.service.impl;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 import com.Elastic.HibernateDemo3.ivy.common.PageList;
 6 import com.Elastic.HibernateDemo3.ivy.dao.DeptDao;
 7 import com.Elastic.HibernateDemo3.ivy.dao.impl.DeptDaoImpl;
 8 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
 9 import com.Elastic.HibernateDemo3.ivy.service.DeptService;
10 public class DeptServiceImpl implements DeptService {
11 
12     private DeptDao deptDao = new DeptDaoImpl();
13 
14     /*
15      * (non-Javadoc)
16      *
17      * @see com.Elastic.HibernateDemo3.ivy.service.DeptService#searchALLDept()
18      */
19     @Override
20     public List<Dept> searchALLDept() {
21         return deptDao.find(null);
22     }
23 
24     /*
25      * (non-Javadoc)
26      *
27      * @see
28      * com.Elastic.HibernateDemo3.ivy.service.DeptService#searchDeptsByName(java
29      * .lang.String)
30      */
31     @Override
32     public List<Dept> searchDeptsByName(String name) {
33         Map<String, Object> params = new HashMap<String,Object>();
34         params.put("deptName", name);
35         
36         return deptDao.find(params);
37     }
38 
39     @Override
40     public List<Dept> searchDeptByCondition(Map<String, Object> condition) {
41         
42         return deptDao.find(condition);
43     }
44 
45     @Override
46     public PageList<Dept> searchDeptByPage(int pageIndex, int pageSize, Map<String, Object> condition) {
47         return deptDao.findByPage(pageIndex, pageSize, condition);
48     }
49 }

9.servlet包
a.DeptServlet

 1 package com.Elastic.HibernateDemo3.ivy.controller;
 2 import java.io.IOException;
 3 import java.util.HashMap;
 4 import java.util.List;
 5 import java.util.Map;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 import com.Elastic.HibernateDemo3.ivy.entity.Dept;
11 import com.Elastic.HibernateDemo3.ivy.service.DeptService;
12 import com.Elastic.HibernateDemo3.ivy.service.impl.DeptServiceImpl;
13 /**
14  * Servlet implementation class DeptServlet
15  */
16 public class DeptServlet extends HttpServlet {
17     private static final long serialVersionUID = 1L;
18        
19     /**
20      * @see HttpServlet#HttpServlet()
21      */
22     public DeptServlet() {
23         super();
24         // TODO Auto-generated constructor stub
25     }
26 
27     /**
28      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
29      */
30     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
31         String oper = request.getParameter("oper");
32         DeptService deptService = new DeptServiceImpl();
33         switch (oper) {
34         case "all":
35             List<Dept> depts = deptService.searchALLDept();
36             request.setAttribute("depts", depts);
37             
38             //转发
39             request.getRequestDispatcher("/dept.jsp").forward(request, response);
40             break;
41         case "byName":
42             request.setAttribute("depts", deptService.searchDeptsByName(request.getParameter("name")));
43             
44             //转发
45             request.getRequestDispatcher("/dept.jsp").forward(request, response);
46             break;
47         case "byCondition":
48             //获取页面提交的参数
49             String deptName = request.getParameter("deptName");
50             String location = request.getParameter("location");
51             String id = request.getParameter("deptId");
52             
53             //创建保存参数的map集合
54             Map<String, Object> condition = new HashMap<String, Object>();
55             if (null != deptName && deptName.trim().length() != 0) {
56                 //【属性名和页面参数一样要写对！！！】
57                 condition.put("deptName", deptName);
58             }
59             if (null != location && location.trim().length() != 0) {
60                 //【属性名和页面参数一样要写对！！！】
61                 condition.put("location", location);
62             }
63             if (null != id && id.trim().length() != 0) {
64                 //【属性名和页面参数一样要写对！！！】
65                 condition.put("deptId", Integer.parseInt(id));
66             }
67             
68             String pageIndexString = request.getParameter("pageIndex");
69             String pageSizeString = request.getParameter("pageSize");
70             
71             int pageIndex = 1;
72             int pageSize = 2;
73             
74             if (pageIndexString != null && pageIndexString.trim().length() != 0) {
75                 pageIndex = Integer.parseInt(pageIndexString);
76             }
77             
78             if (pageSizeString != null && pageSizeString.trim().length() != 0) {
79                 pageSize = Integer.parseInt(pageSizeString);
80             }
81             
82             request.setAttribute("pageList", deptService.searchDeptByPage(pageIndex, pageSize, condition));
83             
84             //转发
85             request.getRequestDispatcher("/dept.jsp").forward(request, response);
86             break;
87 
88         default:
89             break;
90         }
91     }
92 
93     /**
94      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
95      */
96     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
97         this.doGet(request, response);
98     }
99 }

10.common包
a.PageList

 1 package com.Elastic.HibernateDemo3.ivy.common;
 2 import java.util.List;
 3 public class PageList<T> {
 4     private List<T> data;
 5     private Integer pageIndex;
 6     private Integer pageSize;
 7     private Integer total;
 8     private Integer pageTotal;
 9     private Boolean next;
10     private Boolean prev;
11     
12     public PageList(List<T> data, Integer pageIndex, Integer pageSize, Integer total) {
13         super();
14         this.data = data;
15         this.pageIndex = pageIndex;
16         this.pageSize = pageSize;
17         this.total = total;
18         
19         this.pageTotal = (int)Math.ceil((double)total / pageSize);
20         this.next = this.pageIndex < this.pageTotal;
21         this.prev = this.pageIndex > 1;
22     }
23     
24     public List<T> getData() {
25         return data;
26     }
27     public Integer getPageIndex() {
28         return pageIndex;
29     }
30     public Integer getPageSize() {
31         return pageSize;
32     }
33     public Integer getTotal() {
34         return total;
35     }
36     public Integer getPageTotal() {
37         return pageTotal;
38     }
39     public Boolean getNext() {
40         return next;
41     }
42     public Boolean getPrev() {
43         return prev;
44     }
45 }

11.jsp
a.dept.jsp

  1 <%-- 引入JSP页面PAGE指令 --%>
  2 <%@ page language="java" contentType="text/html; charset=UTF-8"
  3     pageEncoding="UTF-8"%>
  4 <%-- 引入JSTL标签指令 --%>
  5 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
  6 <!DOCTYPE html>
  7 <html language="zh-CN">
  8 <head>
  9     <meta charset="utf-8">
 10     <!-- 设置浏览器渲染的引擎  -->
 11     <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
 12     <!-- 设置支持移动设备  -->
 13     <meta name="viewport" content="width=device-width, initial-scale=1">
 14     <title>网页标题</title>
 15     <!-- 引用bootstrap样式 -->
 16     <link rel="stylesheet" type="text/css" href="<%=request.getContextPath() %>/css/bootstrap.min.css">
 17 </head>
 18 <body>
 19     <div class="container-fluid">
 20         <div class="panel panel-primary">
 21             <div class="panel-heading"><span class="h3">部门信息</span></div>
 22             <div class="panel-body">
 23                 <form action="<%=request.getContextPath()%>/dept/search?oper=byCondition" method="post">
 24                     <label>部门编号</label>
 25                     <input name="deptId" type="text"/>
 26                     <label>部门名称</label>
 27                     <!-- name与Dept类的属性名一样 -->
 28                     <input name="deptName" type="text"/>
 29                     <label>部门位置</label>
 30                     <input name="location" type="text"/>
 31                     
 32                     <input type="hidden" name="pageIndex" value="1"/>
 33                     
 34                     <input type="submit" value="搜索" data-toggle="search"/>
 35                 </form>
 36             </div>
 37             
 38             <table class="table table-bordered">
 39                 <thead>
 40                     <tr>
 41                         <td>部门编号</td>
 42                         <td>部门名称</td>
 43                         <td>部门位置</td>
 44                         <td>操作</td>
 45                     </tr>
 46                 </thead>
 47                 <tbody>
 48                     <c:forEach items="${requestScope.pageList.data }" var="dept">
 49                         <tr>
 50                             <td>${dept.deptId }</td>
 51                             <td>${dept.deptName }</td>
 52                             <td>${dept.location }</td>
 53                             <td><a class="btn btn-primary btn-xs" href="javascript:;">删除</a></td>
 54                         </tr>
 55                     
 56                     </c:forEach>
 57                 </tbody>
 58             </table>
 59             <div class="panel-footer">
 60                 <nav>
 61                   <ul id="deptPage" class="pagination" style="margin: 0px;">
 62                     <li <c:if test="${not requestScope.pageList.prev }">class="disabled"</c:if>>
 63                       <a href="#" aria-label="Previous" >
 64                         <span aria-hidden="true">&laquo;</span>
 65                       </a>
 66                     </li>
 67                     <c:forEach begin="1" end="${requestScope.pageList.pageTotal }" step="1" varStatus="status">
 68                         <li <c:if test="${status.index eq requestScope.pageList.pageIndex}">class="active"</c:if>>
 69                              <a href="#">${status.index }</a>
 70                         </li>
 71                     </c:forEach>
 72                     <li <c:if test="${not requestScope.pageList.next }">class="disabled"</c:if>>
 73                       <a href="#" aria-label="Next">
 74                         <span aria-hidden="true">&raquo;</span>
 75                       </a>
 76                     </li>
 77                   </ul>
 78                   <div class="pull-right" style="line-height: 34px;">当前第${requestScope.pageList.pageIndex }页，总共${requestScope.pageList.pageTotal }页</div>
 79                 </nav>
 80             </div>
 81         </div>
 82         
 83     </div>
 84     
 85     <!-- 引用外部JS文件  -->
 86     <script type="text/javascript" src="<%=request.getContextPath() %>/js/jquery-2.2.4.js"></script>
 87     <script type="text/javascript" src="<%=request.getContextPath() %>/js/bootstrap.min.js"></script>
 88 
 89     <script type="text/javascript">
 90         $(function() {
 94             
 95             $('#deptPage').on('click','li > a', function() {
 96                 if ($(this).closest('li').hasClass('disabled')) {
 97                     return;
 98                 }
 99                 var pageIndex;
100                 if ($(this).attr('aria-label') == 'Previous') {
101                     pageIndex = parseInt($('#deptPage > li.active > a').text()) - 1;
102                 } else if ($(this).attr('aria-label') == 'Next') {
103                     pageIndex = parseInt($('#deptPage > li.active > a').text()) + 1;
104                 } else {
105                     pageIndex = $(this).text();
106                 }
107                 $('[name="pageIndex"]').val(pageIndex);
108                 $('[data-toggle="search"]').trigger('click');
109             });
110         });
111     </script>
112     
113 </body>
114 </html>

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原文地址：https://www.cnblogs.com/ivy-xu/p/5596780.html