JavaWeb项目开发案例精粹-第2章投票系统-003Dao层
1.
package com.sanqing.dao; import java.util.List; import com.sanqing.bean.Vote;
import com.sanqing.util.Page; public interface VoteDAO {
public void addVote(Vote vote); //添加投票
public void updateVote(Vote vote); //更新投票
public void deleteVote(int voteID); //删除投票
public List<Vote> findAllVote(Page page); //分页查询所有投票
public List<Vote> findVoteByChannel(Page page,int channelID);//分页查询每频道的投票
public Vote findVoteById(int voteID); //通过ID查询投票
public Vote findVoteByName(String voteName); //通过ID查询投票
public int findAllCount(); //查询所有记录数
public int fintCountByChannel(int channelID);//查询每频道下的记录数
}
2.
package com.sanqing.dao;
import java.util.List;
import com.sanqing.bean.VoteOption;
public interface VoteOptionDAO {
public void addVoteOption(VoteOption voteOption); //添加投票选项
public void updateVoteOption(VoteOption voteOption); //更新投票选项
public void deleteVoteOption(int voteOptionID); //删除投票选项
public List<VoteOption> findVoteOptionByVoteID(int voteID); //查询所有投票选项
public VoteOption findVoteOptionById(int voteOptionID); //通过ID查询投票选项
}
3.
package com.sanqing.daoImpl; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List; import com.sanqing.bean.Vote;
import com.sanqing.dao.VoteDAO;
import com.sanqing.util.DBConnection;
import com.sanqing.util.Page; public class VoteDAOImpl implements VoteDAO{ public void addVote(Vote vote) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String addSQL = "insert into " +
"tb_vote(voteName,channelID) values(?,?)";
PreparedStatement pstmt = null; //声明预处理对象
try {
pstmt = conn.prepareStatement(addSQL); //获得预处理对象并赋值
pstmt.setString(1, vote.getVoteName()); //设置投票名称
pstmt.setInt(2, vote.getChannelID()); //设置频道ID
pstmt.executeUpdate(); //执行添加
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
} public void deleteVote(int voteID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String deleteSQL = "delete from tb_vote where voteID=?";
PreparedStatement pstmt = null; //声明预处理对象
try {
pstmt = conn.prepareStatement(deleteSQL); //获得预处理对象并赋值
pstmt.setInt(1, voteID); //设置投票编号
pstmt.executeUpdate(); //执行删除
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
} public List<Vote> findAllVote(Page page) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findByIDSQL = "select * from tb_vote limit ?,?"; //查询SQL语句
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
List<Vote> votes = new ArrayList<Vote>();
try {
pstmt = conn.prepareStatement(findByIDSQL); //获得预处理对象并赋值
pstmt.setInt(1, page.getBeginIndex());
pstmt.setInt(2, page.getEveryPage());
rs = pstmt.executeQuery(); //执行查询
while(rs.next()) {
Vote vote = new Vote();
vote.setVoteID(rs.getInt(1));
vote.setVoteName(rs.getString(2));
vote.setChannelID(rs.getInt(3));
votes.add(vote);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return votes;
} public Vote findVoteById(int voteID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String querySQL = "select * from tb_vote where voteID = ?";
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
Vote vote = null;
try {
pstmt = conn.prepareStatement(querySQL); //获得预处理对象并赋值
pstmt.setInt(1, voteID);
rs = pstmt.executeQuery(); //执行查询
if(rs.next()) {
vote = new Vote();
vote.setVoteID(rs.getInt(1));
vote.setVoteName(rs.getString(2));
vote.setChannelID(rs.getInt(3));
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return vote;
} public void updateVote(Vote vote) { } public Vote findVoteByName(String voteName) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String querySQL = "select * from tb_vote where voteName = ?";
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
Vote vote = null;
try {
pstmt = conn.prepareStatement(querySQL); //获得预处理对象并赋值
pstmt.setString(1, voteName);
rs = pstmt.executeQuery(); //执行查询
if(rs.next()) {
vote = new Vote();
vote.setVoteID(rs.getInt(1));
vote.setVoteName(rs.getString(2));
vote.setChannelID(rs.getInt(3));
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return vote;
} public int findAllCount() {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findSQL = "select count(*) from tb_vote";
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
int count = 0;
try {
pstmt = conn.prepareStatement(findSQL); //获得预处理对象并赋值
rs = pstmt.executeQuery(); //执行查询
if(rs.next()) {
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return count;
} public List<Vote> findVoteByChannel(Page page, int channelID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findByIDSQL = "select * from tb_vote where channelID=? limit ?,?"; //查询SQL语句
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
List<Vote> votes = new ArrayList<Vote>();
try {
pstmt = conn.prepareStatement(findByIDSQL); //获得预处理对象并赋值
pstmt.setInt(1, channelID);
pstmt.setInt(2, page.getBeginIndex());
pstmt.setInt(3, page.getEveryPage());
rs = pstmt.executeQuery(); //执行查询
while(rs.next()) {
Vote vote = new Vote();
vote.setVoteID(rs.getInt(1));
vote.setVoteName(rs.getString(2));
vote.setChannelID(rs.getInt(3));
votes.add(vote);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return votes;
} public int fintCountByChannel(int channelID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findSQL = "select count(*) from tb_vote where channelID=?";
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
int count = 0;
try {
pstmt = conn.prepareStatement(findSQL); //获得预处理对象并赋值
pstmt.setInt(1, channelID);
rs = pstmt.executeQuery(); //执行查询
if(rs.next()) {
count = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return count;
}
}
4.
package com.sanqing.daoImpl; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List; import com.sanqing.bean.Vote;
import com.sanqing.bean.VoteOption;
import com.sanqing.dao.VoteOptionDAO;
import com.sanqing.util.DBConnection; public class VoteOptionDAOImpl implements VoteOptionDAO { public void addVoteOption(VoteOption voteOption) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String addSQL = "insert into " +
"tb_voteoption(voteOptionName,voteID,ticketNum) values(?,?,?)";
PreparedStatement pstmt = null; //声明预处理对象
try {
pstmt = conn.prepareStatement(addSQL); //获得预处理对象并赋值
pstmt.setString(1, voteOption.getVoteOptionName()); //设置投票选项名称
pstmt.setInt(2, voteOption.getVoteID()); //设置投票ID
pstmt.setInt(3, voteOption.getTicketNum()); //设置投票数
pstmt.executeUpdate(); //执行添加
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
} public void deleteVoteOption(int voteOptionID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String deleteSQL = "delete from tb_voteoption where voteOptionID=?";
PreparedStatement pstmt = null; //声明预处理对象
try {
pstmt = conn.prepareStatement(deleteSQL); //获得预处理对象并赋值
pstmt.setInt(1, voteOptionID); //设置投票编号
pstmt.executeUpdate(); //执行删除
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
} public List<VoteOption> findVoteOptionByVoteID(int voteID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findByIDSQL = "select * from tb_voteoption where voteID = ?";//查询SQL语句
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
List<VoteOption> voteOptions = new ArrayList<VoteOption>();
try {
pstmt = conn.prepareStatement(findByIDSQL); //获得预处理对象并赋值
pstmt.setInt(1, voteID);
rs = pstmt.executeQuery(); //执行查询
while(rs.next()) {
VoteOption voteOption = new VoteOption();
voteOption.setVoteOptionID(rs.getInt(1));
voteOption.setVoteID(rs.getInt(2));
voteOption.setVoteOptionName(rs.getString(3));
voteOption.setTicketNum(rs.getInt(4));
voteOptions.add(voteOption);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return voteOptions;
} public VoteOption findVoteOptionById(int voteOptionID) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String findByIDSQL = "select * from tb_voteoption where voteOptionID = ?";//查询SQL语句
PreparedStatement pstmt = null; //声明预处理对象
ResultSet rs = null;
VoteOption voteOption = null;
try {
pstmt = conn.prepareStatement(findByIDSQL); //获得预处理对象并赋值
pstmt.setInt(1, voteOptionID);
rs = pstmt.executeQuery(); //执行查询
if(rs.next()) {
voteOption = new VoteOption();
voteOption.setVoteOptionID(rs.getInt(1));
voteOption.setVoteID(rs.getInt(2));
voteOption.setVoteOptionName(rs.getString(3));
voteOption.setTicketNum(rs.getInt(4));
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(rs); //关闭结果集对象
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
return voteOption;
} public void updateVoteOption(VoteOption voteOption) {
Connection conn = DBConnection.getConnection(); //获得连接对象
String deleteSQL = "update tb_voteoption set ticketNum = ? where voteOptionID = ?";
PreparedStatement pstmt = null; //声明预处理对象
try {
pstmt = conn.prepareStatement(deleteSQL); //获得预处理对象并赋值
pstmt.setInt(1, voteOption.getTicketNum()); //设置票数
pstmt.setInt(2, voteOption.getVoteOptionID());
pstmt.executeUpdate(); //执行删除
} catch (SQLException e) {
e.printStackTrace();
} finally{
DBConnection.close(pstmt); //关闭预处理对象
DBConnection.close(conn); //关闭连接对象
}
} }
5.
package com.sanqing.daoFactory; import com.sanqing.dao.VoteDAO;
import com.sanqing.daoImpl.VoteDAOImpl; public class VoteDAOFactory {
public static VoteDAO getVoteDAOInstance(){ //工厂方法，用来返回DAO实现类实例
return new VoteDAOImpl(); //返回DAO实现类实例
}
}
6.
package com.sanqing.daoFactory; import com.sanqing.dao.VoteOptionDAO;
import com.sanqing.daoImpl.VoteOptionDAOImpl; public class VoteOptionDAOFactory {
public static VoteOptionDAO getVoteOptionDAOInstance(){ //工厂方法，用来返回DAO实现类实例
return new VoteOptionDAOImpl(); //返回DAO实现类实例
}
}
JavaWeb项目开发案例精粹-第2章投票系统-003Dao层的更多相关文章
- JavaWeb项目开发案例精粹-第2章投票系统-006view层
1.index.jsp <%@ page language="java" import="java.util.*" pageEncoding=" ...
- JavaWeb项目开发案例精粹-第2章投票系统-004action层
1. package com.sanqing.action; import java.util.UUID; import com.opensymphony.xwork2.ActionSupport; ...
- JavaWeb项目开发案例精粹-第2章投票系统-001设计
1.项目结构 2.数据库设计 # MySQL-Front 5.0 (Build 1.0) /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE */; /*!40101 SET ...
- JavaWeb项目开发案例精粹-第2章投票系统-005实体层
1. package com.sanqing.bean; /** * * 投票选项类 * */ public class VoteOption { private int voteOptionID; ...
- JavaWeb项目开发案例精粹-第2章投票系统-002配置文件及公共类
1. <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5&qu ...
- JavaWeb项目开发案例精粹-第6章报价管理系统-05Action层
0. <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC &quo ...
- JavaWeb项目开发案例精粹-第6章报价管理系统-07View层
1. 2.back_index.html <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT= ...
- JavaWeb项目开发案例精粹-第6章报价管理系统-06po层
1. <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www ...
- JavaWeb项目开发案例精粹-第6章报价管理系统-04Service层
1. package com.sanqing.service; import com.sanqing.dao.DAO; import com.sanqing.po.Customer; /** * 客户 ...
随机推荐
- php判断ip黑名单程序代码
学校的新闻系统要求有些新闻只开放校内ip浏览,于是重写了一个代码来实现此功能,实现后的结果是,只要把允许访问的ip列入ip.txt这个文件中即可,同时支持c类ip,例如: ip.txt192.1682 ...
- 扒一扒各大电商网站的m站都用的什么前端技术输入日志标题
凡客首页使用Swiper和zepto,没有使用jquery , 静态首页+js交互, 资源加载使用 lazyLoad X-AspNet-Version: 4.0.30319 X-AspNetMvc- ...
- C#调用Python 脚本语言
1. 安装IronPython http://pan.baidu.com/s/1qW4jNJ2 下载IronPython 2.7 安装下载下来的安装包 2. 创建项目 创建一个C#的Windows窗 ...
- 【UIScrollView】基本方法+基本描述
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(, , , )]; scrollView.backgroundColor = [ ...
- sql2008还原问题
2003的服务器系统不知是因为对SSD的支持不好还是别的原因,系统使用有很多奇怪的问题,所以就升级一下系统,在备份数据库的时候出现了各种问题 源数据库与现数据库都为sqlserver2008,并都安装 ...
- iOS点击cell查看大图，点击大图还原小图-b
一.项目需求 用collectionView展示很多照片,点击某个照片,用全屏scrollView无限循环的方式查看图片.点击放大的图片,图片缩小到原先的尺寸. 如图gif1.gif所示,点击中间的图 ...
- iOS 23 种设计模式
设计模式主要分三个类型:创建型.结构型和行为型. 其中创建型有: 一.Singleton,单例模式:保证一个类只有一个实例,并提供一个访问它的全局访问点 二.Abstract Factory,抽象工厂 ...
- 基于AgileEAS.NET企业应用平台实现基于SOA架构的应用整合方案-开篇
开篇 系统架构的文章,准备在这段时间好好的梳理和整理一下,然后发布基于AgileEAS.NET平台之上的企业级应用架构实践,结合具体的案例来说明AgileEAS.NET平 台之上如何进行系统的逻辑架构 ...
- 【tarjan】BZOJ 1051:受欢迎的牛
1051: [HAOI2006]受欢迎的牛 Time Limit: 10 Sec Memory Limit: 162 MBSubmit: 3134 Solved: 1642[Submit][Sta ...
- 中国餐馆过程（CRP）
查如何事先确定聚类簇数目发现的,是对狄利克雷过程的(DP)的一种解释. 假设一个中国餐馆有无限的桌子,第一个顾客到来之后坐在第一张桌子上.第二个顾客来到可以选择坐在第一张桌子上,也可以选择坐在一张新的 ...