Struts2+Spring2+Hibernate3 web应用示例(二)

三、      建立数据持久化层

1、编写实体类Books及books.hbm.xml映射文件。

package com.sterning.books.model;

import java.util.Date;

public class Books {
    //    Fields
    private String bookId;//编号
    private String bookName;//书名
    private String bookAuthor;//作者
    private String bookPublish;//出版社
    private Date bookDate;//出版日期
    private String bookIsbn;//ISBN
    private String bookPage;//页数
    private String bookPrice;//价格
    private String bookContent;//内容提要
   
    //    Constructors
    public Books(){}
   
    //    Property accessors

    public String getBookId() {
        return bookId;
    }

    public void setBookId(String bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public String getBookAuthor() {
        return bookAuthor;
    }

    public void setBookAuthor(String bookAuthor) {
        this.bookAuthor = bookAuthor;
    }

    public String getBookContent() {
        return bookContent;
    }

    public void setBookContent(String bookContent) {
        this.bookContent = bookContent;
    }

    public Date getBookDate() {
        return bookDate;
    }

    public void setBookDate(Date bookDate) {
        this.bookDate = bookDate;
    }

    public String getBookIsbn() {
        return bookIsbn;
    }

    public void setBookIsbn(String bookIsbn) {
        this.bookIsbn = bookIsbn;
    }

    public String getBookPage() {
        return bookPage;
    }

    public void setBookPage(String bookPage) {
        this.bookPage = bookPage;
    }

    public String getBookPrice() {
        return bookPrice;
    }

    public void setBookPrice(String bookPrice) {
        this.bookPrice = bookPrice;
    }

    public String getBookPublish() {
        return bookPublish;
    }

    public void setBookPublish(String bookPublish) {
        this.bookPublish = bookPublish;
    }
}

  com.sterning.books.model.Books.java

       接下来要把实体类Books的属性映射到books表，编写下面的books.hbm.xml文件：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
     <class name="com.sterning.books.model.Books" table="books" >
         <id name="bookId" type="string">
            <column name="book_id" length="5" />
            <generator class="assigned" />
        </id>
        <property name="bookName" type="string">
            <column name="book_name" length="100" />
        </property>
         <property name="bookAuthor" type="string">
            <column name="book_author" length="100" />
        </property>
        <property name="bookPublish" type="string">
            <column name="book_publish" length="100" />
        </property>
         <property name="bookDate" type="java.sql.Timestamp">
            <column name="book_date" length="7" />
        </property>
          <property name="bookIsbn" type="string">
            <column name="book_isbn" length="20" />
        </property>
        <property name="bookPage" type="string">
            <column name="book_page" length="11" />
        </property>
        <property name="bookPrice" type="string">
            <column name="book_price" length="4" />
        </property>
         <property name="bookContent" type="string">
            <column name="book_content" length="100" />
        </property>
     </class>
</hibernate-mapping>

        com.sterning.books.model.books.hbm.xml

2、hibernate.cfg.xml配置文件如下：（注意它的位置在scr/hibernate.cfg.xml）

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
    <property name="show_sql">true</property>

    <mapping resource="com/sterning/books/model/books.hbm.xml"></mapping>
</session-factory>
</hibernate-configuration>

  Com.sterning.bean.hibernate.hibernate.cfg.xml

四、      建立DAO层

DAO访问层负责封装底层的数据访问细节，不仅可以使概念清晰，而且可以提高开发效率。

1、建立DAO的接口类：BooksDao

package com.sterning.books.dao.iface;

import java.util.List;

import com.sterning.books.model.Books;

public interface BooksDao {
    List getAll();//获得所有记录
    List getBooks(int pageSize, int startRow);//获得所有记录
    int getRows();//获得总行数
    int getRows(String fieldname,String value);//获得总行数
    List queryBooks(String fieldname,String value);//根据条件查询
    List getBooks(String fieldname,String value,int pageSize, int startRow);//根据条件查询
    Books getBook(String bookId);//根据ID获得记录
    String getMaxID();//获得最大ID值
    void addBook(Books book);//添加记录
    void updateBook(Books book);//修改记录
    void deleteBook(Books book);//删除记录   
}

  com.sterning.books.dao.iface.BooksDao.java

2、实现此接口的类文件，BooksMapDao

package com.sterning.books.dao.hibernate;

import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.sterning.books.dao.iface.BooksDao;
import com.sterning.books.model.Books;
import com.sterning.commons.PublicUtil;


/** *//**
* @author cwf
*
*/
public class BooksMapDao extends HibernateDaoSupport implements BooksDao {

    public BooksMapDao(){}

    /** *//**
     * 函数说明：添加信息
     * 参数说明：对象
     * 返回值：
     */
    public void addBook(Books book) {
        this.getHibernateTemplate().save(book);
    }

    /** *//**
     * 函数说明：删除信息
     * 参数说明： 对象
     * 返回值：
     */
    public void deleteBook(Books book) {
        this.getHibernateTemplate().delete(book);
    }

    /** *//**
     * 函数说明：获得所有的信息
     * 参数说明：
     * 返回值：信息的集合
     */
    public List getAll() {
        String sql="FROM Books ORDER BY bookName";
        return this.getHibernateTemplate().find(sql);
    }
   
    /** *//**
     * 函数说明：获得总行数
     * 参数说明：
     * 返回值：总行数
     */
    public int getRows() {
        String sql="FROM Books ORDER BY bookName";
        List list=this.getHibernateTemplate().find(sql);
        return list.size();
    }
   
    /** *//**
     * 函数说明：获得所有的信息
     * 参数说明：
     * 返回值：信息的集合
     */
    public List getBooks(int pageSize, int startRow) throws HibernateException {
        final int pageSize1=pageSize;
        final int startRow1=startRow;
        return this.getHibernateTemplate().executeFind(new HibernateCallback(){

            public List doInHibernate(Session session) throws HibernateException, SQLException {
                // TODO 自动生成方法存根
                Query query=session.createQuery("FROM Books ORDER BY bookName");
                query.setFirstResult(startRow1);
                query.setMaxResults(pageSize1);
                return query.list();
            }
        });
    }

    /** *//**
     * 函数说明：获得一条的信息
     * 参数说明： ID
     * 返回值：对象
     */
    public Books getBook(String bookId) {
        return (Books)this.getHibernateTemplate().get(Books.class,bookId);
    }

    /** *//**
     * 函数说明：获得最大ID
     * 参数说明：
     * 返回值：最大ID
     */
    public String getMaxID() {
        String date=PublicUtil.getStrNowDate();
        String sql="SELECT MAX(bookId)+1 FROM Books  ";
        String noStr = null;
        List ll = (List) this.getHibernateTemplate().find(sql);
        Iterator itr = ll.iterator();
        if (itr.hasNext()) {
            Object noint = itr.next();
            if(noint == null){
                noStr = "1";               
            }else{
                noStr = noint.toString();
            }
        }
       
        if(noStr.length()==1){
            noStr="000"+noStr;
        }else if(noStr.length()==2){
            noStr="00"+noStr;
        }else if(noStr.length()==3){
            noStr="0"+noStr;
        }else{
            noStr=noStr;
        }
        return noStr;
    }

    /** *//**
     * 函数说明：修改信息
     * 参数说明： 对象
     * 返回值：
     */
    public void updateBook(Books pd) {
        this.getHibernateTemplate().update(pd);
    }

    /** *//**
     * 函数说明：查询信息
     * 参数说明： 集合
     * 返回值：
     */
    public List queryBooks(String fieldname,String value) {
        System.out.println("value: "+value);
        String sql="FROM Books where "+fieldname+" like '%"+value+"%'"+"ORDER BY bookName";
        return this.getHibernateTemplate().find(sql);
    }
   
    /** *//**
     * 函数说明：获得总行数
     * 参数说明：
     * 返回值：总行数
     */
    public int getRows(String fieldname,String value) {
        String sql="";
        if(fieldname==null||fieldname.equals("")||fieldname==null||fieldname.equals(""))
            sql="FROM Books ORDER BY bookName";
        else   
            sql="FROM Books where "+fieldname+" like '%"+value+"%'"+"ORDER BY bookName";
        List list=this.getHibernateTemplate().find(sql);
        return list.size();
    }
   
    /** *//**
     * 函数说明：查询信息
     * 参数说明： 集合
     * 返回值：
     */
    public List getBooks(String fieldname,String value,int pageSize, int startRow) {
        final int pageSize1=pageSize;
        final int startRow1=startRow;
        final String queryName=fieldname;
        final String queryValue=value;
        String sql="";
       
        if(queryName==null||queryName.equals("")||queryValue==null||queryValue.equals(""))
            sql="FROM Books ORDER BY bookName";
        else   
            sql="FROM Books where "+fieldname+" like '%"+value+"%'"+"ORDER BY bookName";
       
        final String sql1=sql;
        return this.getHibernateTemplate().executeFind(new HibernateCallback(){

            public List doInHibernate(Session session) throws HibernateException, SQLException {
                // TODO 自动生成方法存根
                Query query=session.createQuery(sql1);
                query.setFirstResult(startRow1);
                query.setMaxResults(pageSize1);
                return query.list();
            }
        });
    }

}