作爲一名新人,這是我這個廢柴大一狗大一狗的練習作業,要用什麼似懂非懂的DAO程序設計模式寫
要求過程是這樣的
過程大概是這樣的,講實話我看的是一臉懵逼,不過作業總是要交差的,只能硬着頭皮,寫一點是一點了
首先建表
然後我就頭一次破天荒一臉懵逼的分了五個包
大概就是一個連接數據庫用的,還有一個接口包,還有一個包是實體類,還有一個是用來寫具體的實現,最後一個就是測試了
import java.sql.ResultSet;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;
import com.cn.Test.Main;
import com.cn.Test.Manager;
import com.cn.dao.BaseDao;
import com.cn.entity.Account;
import com.cn.entity.Pet;
import com.cn.entity.PetOwner;
import com.cn.entity.PetStore;
import com.cn.impl.PetOwnerService;
public class PetOwnerServiceImpl extends BaseDao implements PetOwnerService{
private String sname;
public static int i;
Scanner sc = new Scanner(System.in);
private int sell;
//登錄驗證實現方法
@Override
public HashMap LoginCheck() throws Exception {
BaseDao.selectPetOwnerServiceDao();
System.out.println("請先登錄,請輸入主人名字:");
sname=sc.next();
System.out.println("\n請輸入主人密碼:");
String spassword=sc.next();
Set keySet = hm.keySet();
Iterator it = keySet.iterator();
boolean falg = false;
while (it.hasNext()) {
Object user = it.next();
Object pw = hm.get(user);
if (sname.equals(user)&&spassword.equals(pw)) {
System.out.println("登錄成功");
Manager.PetDeal();
falg = true;
}
}
if (falg==false) {
System.out.println("用戶不存在,請重新輸入!!!");
LoginCheck();
}
return hm;
}
@Override
//查看登錄的寵物主人實現方法
public ResultSet selectPetOwnerService(PetOwner po) throws Exception {
String sql="select * from petowner where name='"+sname+"';";
ResultSet i = this.selectPetOwnerServiceDao(sql);
return i;
}
//查看寵物庫存實現方法
@Override
public ResultSet InventoryPetOwnerService(Pet p) throws Exception {
String sql="select * from pet;";
ResultSet i = this.selectInventoryPetDao(sql);
return i;
}
//購買庫存寵物實現方法
@Override
public int BuyInventoryPetOwner(Pet p, Account ac) throws Exception {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
System.out.println("---請選擇要購買哪一個寵物,並輸入序號---");
int id=sc.nextInt();
System.out.println("請輸入交易金額:");
int money=sc.nextInt();
String sql1="UPDATE pet SET owner_id ="+i+" WHERE id="+id+" ;";
String sql4="UPDATE pet SET store_id ="+"null"+" WHERE id="+id+" ;";
String sql2="insert account(deal_type,pet_id,seller_id,buyer_id,price,deal_time) values("+1+","+id+","+i+","+"(SELECT store_id FROM pet WHERE id="+id+"),"+money+","+"YEAR(NOW())"+");";
String sql3="update petowner set money=money-"+money+" where id="+i+";";
int i=this.BuyPet(sql1,sql2,sql3,sql4);
return i;
}
//查詢我的寵物
@Override
public ResultSet SellSelectPetOwner(Pet p, Account ac) throws Exception {
// TODO Auto-generated method stub
System.out.println("---我的寵物列表---");
String sql="select * from pet where id="+i+";";
ResultSet i = this.OwnerselectPetDao(sql);
return i;
}
//選擇出售寵物
@Override
public ResultSet SellPetOwner(Pet p) throws Exception {
System.out.println("---請輸入要出售的寵物序號---");
sell=sc.nextInt();
String sql="select * from pet where owner_id="+i+";";
ResultSet i=this.SellSelectPetDao(sql);
return i;
}
//出售寵物執行
@Override
public int SellPetOwnerExecute() throws Exception{
int store=sc.nextInt();
String sql1="update pet set store_id="+store+" where id="+sell+";";
String sql4="update pet set owner_id="+"null"+" where id="+sell+";";
System.out.println("請輸入交易金額:");
int money=sc.nextInt();
String sql2="update petowner set money=money+"+money+" where id="+i+";";
String sql3="insert account(deal_type,pet_id,seller_id,buyer_id,price,deal_time) values("+2+","+sell+","+i+","+store+","+money+","+"YEAR(NOW())"+");";
int i=this.BuyPet(sql1,sql2,sql3,sql4);
return i;
}
}具體的我就把主人登錄頁面寫完了,具體就一個登錄驗證,購買和出售的方法
大概就是這樣了
package com.cn.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;
import com.cn.dao.impl.PetOwnerServiceImpl;
import com.cn.entity.Pet;
public class BaseDao {
private static String driver; // 驅動
private static String url; // 鏈接地址
private static String user; // 用戶名
private static Connection conn; // 連接對象
private static String password; // 密碼
public static HashMap hm=new HashMap();
private static String name;
//連接Mysql
public static Connection getConnection() throws Exception {
driver = "com.mysql.jdbc.Driver";
Class.forName(driver);
url = "jdbc:MYSQL://localhost:3306/ljt";
user = "root";
password = "root";
conn = DriverManager.getConnection(url, user, password);
return conn;
}
/**
* 增,刪,該的操作方法
* */
public int execute(String sql,Object[] parmar) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement st = conn.prepareStatement(sql);
//遍歷
for (int i = 0; i < parmar.length; i++) {
//通過循環添加值
st.setObject(i+1, parmar[i]);
}
//執行
int i = st.executeUpdate();
return i;
}
//購買寵物執行方法
public int BuyPet(String sql,String sql2,String sql3,String sql4) throws Exception{
conn = getConnection();
//獲取st對象
PreparedStatement st = conn.prepareStatement(sql);
PreparedStatement st2 = conn.prepareStatement(sql2);
PreparedStatement st3 = conn.prepareStatement(sql3);
PreparedStatement st4= conn.prepareStatement(sql4);
int i = st.executeUpdate();
i=st2.executeUpdate();
i=st3.executeUpdate();
i=st4.executeUpdate();
System.out.println("交易成功!!!");
System.out.println("臺賬正確插入一條信息!!!");
return i;
}
//查詢Account表
public ResultSet selectAccountDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
while (i.next()) {
int id = i.getInt("id");
int deal_type = i.getInt("deal_type");
int pet_id = i.getInt("pet_id");
int seller_id = i.getInt("seller_id");
int buyer_id = i.getInt("buyer_id");
int price = i.getInt("price");
int deal_time = i.getInt("deal_time");
System.out.println(id+"\t"+deal_type+"\t"+pet_id+"\t"+seller_id+"\t"+buyer_id+"\t"+price+"\t"+deal_time );
}
return i;
}
//查詢Pet表執行
public ResultSet selectPetDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"寵物名稱");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String type_name=i.getString("type_name");
int health=i.getInt("health");
int love=i.getInt("love");
String birthday=i.getString("birthday");
int owner_id=i.getInt("owner_id");
int store_id=i.getInt("store_id");
System.out.println(id+"\t"+name);
}
return i;
}
//選擇出售寵物信息
public ResultSet SellSelectPetDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"寵物名稱");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String type_name=i.getString("type_name");
int health=i.getInt("health");
int love=i.getInt("love");
String birthday=i.getString("birthday");
int owner_id=i.getInt("owner_id");
int store_id=i.getInt("store_id");
System.out.println("寵物名字叫:"+name+"\t"+"寵物類別是:"+type_name);
}
return i;
}
//查詢庫存寵物執行
public ResultSet selectInventoryPetDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"寵物名稱"+"\t"+"類型"+"\t"+"元寶數");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String type_name=i.getString("type_name");
int health=i.getInt("health");
int love=i.getInt("love");
String birthday=i.getString("birthday");
int owner_id=i.getInt("owner_id");
int store_id=i.getInt("store_id");
System.out.println(id+"\t"+name+"\t"+type_name);
}
return i;
}
//查詢PetStore表執行
public ResultSet selectPetStoreDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"寵物商店");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String password=i.getString("password");
int balance=i.getInt("balance");
System.out.println(id+"\t"+name);
}
return i;
}
//
public static HashMap selectPetOwnerServiceDao() throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
String sql="select * from petowner;";
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
while (i.next()) {
int id = i.getInt("id");
name=i.getString("name");
password=i.getString("password");
int money=i.getInt("money");
hm.put(name, password);
}
return hm;
}
public ResultSet selectPetOwnerDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"主人姓名");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String password=i.getString("password");
int money=i.getInt("money");
System.out.println(id+"\t"+name);
}
return i;
}
public ResultSet selectPetOwnerServiceDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
while (i.next()) {
PetOwnerServiceImpl.i = i.getInt("id");
String name=i.getString("name");
String password=i.getString("password");
int money=i.getInt("money");
System.out.println("名字:"+name);
System.out.println("元寶數:"+money);
}
return i;
}
//查詢主人擁有的寵物
public ResultSet OwnerselectPetDao(String sql) throws Exception{
//獲取連接對象
conn = getConnection();
//獲取st對象
PreparedStatement pt=conn.prepareStatement(sql);
ResultSet i = pt.executeQuery();
System.out.println("序號"+"\t"+"寵物名稱"+"\t"+"類型");
while (i.next()) {
int id = i.getInt("id");
String name=i.getString("name");
String type_name=i.getString("type_name");
int health=i.getInt("health");
int love=i.getInt("love");
String birthday=i.getString("birthday");
int owner_id=i.getInt("owner_id");
int store_id=i.getInt("store_id");
System.out.println(id+"\t"+name+"\t"+type_name);
}
return i;
}
}大部分也就這樣了,雖然全是bug,但勉強能把老師糊弄過去了,