• com.jsj.dao.Impl====新闻发布系统(6)


    是对dao层的实现

    AdminDaoImpl

     1 package com.jsj.dao.Impl;
     2 
     3 import com.jsj.dao.AdminDao;
     4 import com.jsj.entity.Admin;
     5 import com.jsj.utils.BeanHandler;
     6 import com.jsj.utils.JdbcTemplate;
     7 
     8 public class AdminDaoImpl implements AdminDao {
     9     //实现上面对应的接口的方法
    10     //接收到username和password参数
    11     @Override
    12     public Admin getAdminByPassword(String username, String password) throws Exception {
    13        //sql语句,?可以看做是变量,你可以添加数据的
    14         String sql = "select * from admin where username = ? and password = ?";
    15         //然后调用工具类,(Admin)这是强制转换,
    16         //类名.方法名,是因为方法是static类型的,所以不要创建对象,然后在调用
    17         //query的参数有:sql语句,new BeanHandler(Admin.class)是对象、username、password
    18         //Admin.class是:返回的Adimin的Class对象,如果后面加newINnstace()就好创建对象
    19         return (Admin) JdbcTemplate.query(sql, new BeanHandler(Admin.class), username, password);
    20     }
    21 }
    View Code

    NewCateDaoImpl

     1 package com.jsj.dao.Impl;
     2 
     3 import com.jsj.dao.NewsCateDao;
     4 import com.jsj.entity.NewsCate;
     5 import com.jsj.utils.BeanHandler;
     6 import com.jsj.utils.BeanListHandler;
     7 import com.jsj.utils.JdbcTemplate;
     8 
     9 import java.util.List;
    10 
    11 public class NewsCateDaoImpl implements NewsCateDao {
    12 
    13     @Override
    14     public List<NewsCate> getAll() throws Exception {
    15         //sql语句,实现查找
    16         String sql = "select * from news_cate";
    17         //就是直接调用工具类
    18         return (List<NewsCate>) JdbcTemplate.query(sql,new BeanListHandler(NewsCate.class));
    19     }
    20 
    21     @Override
    22     public NewsCate getById(Integer id) throws Exception {
    23         String sql = "select * from news_cate where id = ?";
    24         return (NewsCate) JdbcTemplate.query(sql, new BeanHandler(NewsCate.class),id);
    25     }
    26 
    27     @Override
    28     public int insert(NewsCate newsCate) throws Exception {
    29         String sql = "insert into news_cate(name) values (?)";
    30         return JdbcTemplate.update(sql, newsCate.getName());
    31     }
    32 
    33     @Override
    34     public int update(NewsCate newsCate) throws Exception {
    35         String sql = "update news_cate set name=? where id=?";
    36         return JdbcTemplate.update(sql, newsCate.getName(),newsCate.getId());
    37     }
    38 
    39     @Override
    40     public int deleteById(Integer id) throws Exception {
    41         String sql = "delete from news_cate where id = ?";
    42         return JdbcTemplate.update(sql, id);
    43     }
    44 }
    View Code

    NewDaoImpl

     1 package com.jsj.dao.Impl;
     2 
     3 import com.jsj.dao.NewsDao;
     4 import com.jsj.entity.News;
     5 import com.jsj.utils.BeanHandler;
     6 import com.jsj.utils.BeanListHandler;
     7 import com.jsj.utils.JdbcTemplate;
     8 
     9 import java.sql.*;
    10 import java.util.List;
    11 
    12 public class NewsDaoImpl implements NewsDao {
    13 
    14     @Override
    15     public int getCount() throws Exception {
    16         String sql = "select count(*) from news";
    17         return JdbcTemplate.queryCount(sql);
    18     }
    19 
    20     @Override
    21     public int getCountByCate(Integer cateId) throws Exception {
    22         String sql = "select count(*) from news where cate_id = ? order by time desc";
    23         return JdbcTemplate.queryCount(sql, cateId);
    24     }
    25 
    26     @Override
    27     public List<News> getNewsList(Integer beginIndex, Integer length) throws Exception {
    28         String sql = "select * from news order by time desc limit ?, ?";
    29         return (List<News>) JdbcTemplate.query(sql,new BeanListHandler(News.class),beginIndex, length);
    30     }
    31 
    32     @Override
    33     public List<News> getNewsListByCate(Integer cateId,Integer beginIndex,Integer length) throws Exception {
    34         String sql = "select * from news where cate_id = ? limit ?, ?";
    35         return (List<News>) JdbcTemplate.query(sql, new BeanListHandler(News.class),cateId,beginIndex, length);
    36     }
    37 
    38     @Override
    39     public int insert(News news) throws Exception {
    40         String sql = "insert into news(cate_id,title,author,time,content) values (?,?,?,?,?)";
    41         return JdbcTemplate.update(sql, news.getCateId(),news.getTitle(),news.getAuthor(),
    42                 new Date(news.getTime().getTime()),news.getContent());
    43     }
    44 
    45     @Override
    46     public News getById(Integer id) throws Exception {
    47         String sql = "select * from news where id = ?";
    48         return (News) JdbcTemplate.query(sql, new BeanHandler(News.class),id);
    49     }
    50 
    51     @Override
    52     public List<News> getAll() throws Exception {
    53         String sql = "select * from news";
    54         return (List<News>) JdbcTemplate.query(sql, new BeanListHandler(News.class));
    55     }
    56 
    57     @Override
    58     public int deleteById(Integer id) throws SQLException {
    59         String sql = "delete from news where id = ?";
    60         return JdbcTemplate.update(sql, id);
    61     }
    62 }
    View Code

    UserDaoImpl

     1 package com.jsj.dao.Impl;
     2 
     3 import com.jsj.dao.UserDao;
     4 import com.jsj.entity.User;
     5 import com.jsj.utils.BeanHandler;
     6 import com.jsj.utils.JdbcTemplate;
     7 
     8 public class UserDaoImpl implements UserDao {
     9 
    10     @Override
    11     public int insert(User user) throws Exception {
    12         String sql = "insert into user(username,password,birthday,email,tel_number) values (?,?,?,?,?)";
    13         return JdbcTemplate.update(sql, user.getUsername(),user.getPassword(),user.getBirthday(),user.getEmail(),user.getTelNumber());
    14     }
    15 
    16     @Override
    17     public User getUserByPassword(String username, String password) throws Exception {
    18         String sql = "select * from user where username = ? and password = ?";
    19         return (User) JdbcTemplate.query(sql,new BeanHandler(User.class),username, password);
    20     }
    21 
    22 }
    View Code
    会当凌绝顶,一览众山小
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  • 原文地址:https://www.cnblogs.com/quenvpengyou/p/12896138.html
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