Java寒假17

 com.maike.dao

TradeDao

package com.maike.dao;

import java.util.List;

import com.maike.model.Trade;

public interface TradeDao {

List<Trade> selectAll();
Trade selectByName(Integer tradeId);
int insert(Trade trade);
int update(Trade trade);
int delete(Integer pid);

}

 

TradeDaoImpl 

package com.maike.dao;

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.maike.model.Trade;
import com.maike.util.ConnectionUtil;

public class TradeDaoImpl implements TradeDao {
Trade trade;
Connection con = null;
PreparedStatement pt = null;
ResultSet rs = null;
String sql;

/**
* 查询所有宿舍
*/
@Override
public List<Trade> selectAll() {
// TODO Auto-generated method stub
System.out.println("---------------10-----------------------");
List<Trade> list = new ArrayList<Trade>();
sql = "select * from trade";
try {
System.out.println("---------------11-----------------------");
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
rs = pt.executeQuery();

while(rs.next()) {
System.out.println("---------------12-----------------------");
trade = new Trade();
trade.setTradeId(rs.getInt("tradeId"));
trade.setTradeName(rs.getString("tradename"));
trade.setTradePrice(rs.getString("tradeprice"));
System.out.println("---------------13-----------------------");
list.add(trade);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt, rs);
}
return list;
}

/**
* 查询
*/
@Override
public Trade selectByName(Integer tradeId) {
// TODO Auto-generated method stub
sql = "select * from trade where tradeId = ?";
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setLong(1, tradeId);
rs = pt.executeQuery();

while(rs.next()) {
trade = new Trade();
trade.setTradeId(rs.getInt("tradeId"));
trade.setTradeName(rs.getString("tradename"));
trade.setTradePrice(rs.getString("tradeprice"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt, rs);
}
return trade;
}

/**
* 插入、添加
*/
@Override
public int insert(Trade trade) {
// TODO Auto-generated method stub
System.out.println("--------------4----------------");
int k = 0;
sql = "insert into trade values(null,?,?)";
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setString(1, trade.getTradeName());
pt.setString(2, trade.getTradePrice());
System.out.println("--------------5----------------");

k = pt.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt);
}
return k;
}

/**
* 修改
*/
@Override
public int update(Trade trade) {
// TODO Auto-generated method stub
int k = 0;
sql = "update trade set tradeprice = ?, tradename = ? where tradeid = ?";
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setString(1, trade.getTradePrice());
pt.setString(2, trade.getTradeName());
pt.setInt(3, trade.getTradeId());

k = pt.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt);
}
return k;
}

/**
* 删除
*/
@Override
public int delete(Integer pid) {
// TODO Auto-generated method stub
int k = 0;
sql = "delete from trade where tradeId = ?";
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setLong(1, pid);

k = pt.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt);
}
return k;
}

}

UserDao 

package com.maike.dao;

import com.maike.model.User;

public interface UserDao {

int insert(String userName,String userPwd);
User selectByName(String userName);

}

 

 

UserDaoImpl 

package com.maike.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.maike.model.User;
import com.maike.util.ConnectionUtil;

public class UserDaoImpl implements UserDao {
Connection con = null;
PreparedStatement pt = null;
ResultSet rs = null;
String sql;

@Override
public int insert(String userName, String userPwd) {
System.out.println("注册");
System.out.println(userName);
System.out.println(userPwd);
// TODO Auto-generated method stub
int k = 0;
sql = "insert into user values(null,?,?)";
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setString(1, userName);
pt.setString(2, userPwd);
k = pt.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt);
}
System.out.println(k);
return k;
}

@Override
public User selectByName(String userName) {
// TODO Auto-generated method stub
sql = "select * from user where user_name = ?";
User user = new User();
try {
con = ConnectionUtil.getConnection();
pt = con.prepareStatement(sql);
pt.setString(1, userName);
rs = pt.executeQuery();

while(rs.next()) {
user.setUserId(rs.getInt("user_id"));
user.setUserName(rs.getString("user_name"));
user.setUserPwd(rs.getString("user_pwd"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
ConnectionUtil.closeRe(con, pt, rs);
}
return user;
}

}

标签：Java,17,pt,rs,trade,寒假,sql,import,con
来源： https://www.cnblogs.com/gj-zzh2021/p/15907672.html