简单的一个月之设计实现内容1

需求:简单的新闻管理系统,实现简单的增删改查功能

1.数据库表的建立 ID非空,数据类型看着给

2.写实体(entity)News.java 要与数据库中的字段相对应,(id,optimistic我没写,问题不大)

  1 package com.pay.boss.entity; //封装好的entity包,直接引用2 3 import java.util.Date;  //日期工具4 5 import javax.persistence.Column;6 import javax.persistence.Entity;7 import javax.persistence.EnumType;8 import javax.persistence.Enumerated;9 import javax.persistence.SequenceGenerator;10 import javax.persistence.Table;11 12 import com.pay.boss.enums.NewsCategory;//枚举13 import com.pay.boss.enums.NewsStatus;14 15 /**16  * Title: 新闻需求17  */18 19 @Entity20 @SequenceGenerator(name = "SEQ_STORE", sequenceName = "SEQ_NEWS_ID", allocationSize=1)  //主键生成策略21 @Table(name = "NEWS")   //映射数据库的一个表,表名为news22 public class News extends AutoIDEntity{23     24     private String newsNo;       //新闻编号25     private String summary;      // 摘要26     private String title;        //题目27     private String content;      //内容28     private String imgUrl;       // 图片路径29     private String author;       //作者30     private NewsCategory newsCategory; //新闻类别31     private NewsStatus status;        //新闻状态;      32     private Date createTime;     // 创建时间33     private Date updateTime;     //修改时间34     35     36     @Column(name = "NEWS_NO") //列的注解,显示name37     public String getNewsNo() {38         return newsNo;39     }40     public void setNewsNo(String newsNo) {41         this.newsNo = newsNo;42     }43     44     @Column(name = "SUMMARY")45     public String getSummary() {46         return summary;47     }48     public void setSummary(String summary) {49         this.summary = summary;50     }51     52     @Column(name = "TITLE")53     public String getTitle() {54         return title;55     }56     public void setTitle(String title) {57         this.title = title;58     }59     60     @Column(name = "CONTENT")61     public String getContent() {62         return content;63     }64     public void setContent(String content) {65         this.content = content;66     }67     68 69     @Column(name = "IMG_URL")70     public String getImgUrl() {71         return imgUrl;72     }73     public void setImgUrl(String imgUrl) {74         this.imgUrl = imgUrl;75     }76     77     @Column(name = "AUTHOR")78     public String getAuthor() {79         return author;80     }81     public void setAuthor(String author) {82         this.author = author;83     }84     85     @Enumerated(EnumType.STRING)  //枚举注解86     @Column(name = "NEWS_CATEGORY")87     public NewsCategory getNewsCategory() {88         return newsCategory;89     }90     public void setNewsCategory(NewsCategory newsCategory)         91        {92         this.newsCategory = newsCategory;93     }94     95     @Enumerated(EnumType.STRING)96     @Column(name = "STATUS")97     public NewsStatus getStatus() {98         return status;99     }
100     public void setStatus(NewsStatus status) {
101         this.status = status;
102     }
103     
104     @Column(name = "CREATE_TIME", columnDefinition = "DATE")
105     public Date getCreateTime() {
106         return createTime;
107     }
108     public void setCreateTime(Date createTime) {
109         this.createTime = createTime;
110     }
111     
112     @Column(name = "UPDATE_TIME", columnDefinition = "DATE")
113     public Date getUpdateTime() {
114         return updateTime;
115     }
116     public void setUpdateTime(Date updateTime) {
117         this.updateTime = updateTime;
118     }
119 }

3.写对应的dao接口及其实现

接口:NewsDao

package com.pay.boss.dao;import com.pay.boss.entity.News;public interface NewsDao {public News create(News news);  //增加信息；public News update(News news);  //更新信息；public void delete(News news);  //删除信息；public News findByNewsNo(String newsNO);  //通过编号查找    public News findById(Long id);  //通过id查找     id:逻辑主键；
    
}

实现:NewsDaoImpl

package com.pay.boss.dao.impl;import com.pay.boss.dao.DAOException;  //dao异常，用于抛出;
import com.pay.boss.dao.NewsDao;
import com.pay.boss.entity.News;
import com.pay.boss.dao.EntityDao;   //Ioc容器（依赖）注入sessionFactory;可以不定义这个dao，直接进行session注入;public class NewsDaoImpl implements NewsDao {private EntityDao entityDao;    //注入sessionFactory；public EntityDao getEntityDao(){return entityDao;                    //get可以不需要;
    }public void setEntityDao(EntityDao entityDao) {this.entityDao = entityDao;}@Override    //重写public News create(News news) throws DAOException {entityDao.persist(news);  //将实体保存在数据库中;return news;}@Overridepublic News update(News news) throws DAOException {return entityDao.merge(news);  //更新实体对象或者将实体保存在数据库中；
    }@Overridepublic void delete(News news) {entityDao.remove(news);}@Overridepublic News findByNewsNo(String newsNo) {String hql = "from News where newsNo=?";  //利用hql语言进行预编译；return entityDao.findUnique(News.class, hql, newsNo);}@Overridepublic News findById(Long id) {return entityDao.findById(News.class, id);}}