模拟用户操作购物车添加商品修改数量
项目结构
数据库
JdbcUtil.java
package com.jdbc.util;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
import org.apache.commons.dbcp.BasicDataSource;
public class JdbcUtil {
private static BasicDataSource dataSource = null;
static{
dataSource = new BasicDataSource();
Properties prop = new Properties();
try {
prop.load(JdbcUtil.class.getClassLoader().getResourceAsStream("db.properties"));
String url = prop.getProperty("jdbc.url");
String username = prop.getProperty("jdbc.username");
String password = prop.getProperty("jdbc.password");
String initialSizeStr = prop.getProperty("jdbc.initialSize");
int initialSize = Integer.parseInt(initialSizeStr);
String maxActiveStr = prop.getProperty("jdbc.maxActive");
int maxActive = Integer.parseInt(maxActiveStr);
String maxWaitStr = prop.getProperty("jdbc.maxWait");
int maxWait = Integer.parseInt(maxWaitStr);
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
dataSource.setInitialSize(initialSize);
dataSource.setMaxActive(maxActive);
dataSource.setMaxWait(maxWait);
} catch (IOException e) {
e.printStackTrace();
}
}
public static Connection getConn() throws SQLException{
return dataSource.getConnection();
}
public static void close(Connection conn){
if (conn!=null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) throws SQLException {
System.out.println(dataSource.getUrl()+getConn());
}
}db.properties
jdbc.url=jdbc:mysql://localhost:3306/gjxfj?useSSL=true
jdbc.username=root
jdbc.password=root
jdbc.initialSize=20
jdbc.maxActive=100
jdbc.maxWait=5000CartItem.java
package com.jdbc.entity;
import java.io.Serializable;
import java.sql.Timestamp;
public class CartItem implements Serializable{
private static final long serialVersionUID = 1L;
private Integer id;
private Integer userId;
private Integer itemId;
private int num;
/*购物车信息的状态 1.未被删除 2.被删除*/
private int status;
private Timestamp created;
private Timestamp updated;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public Integer getItemId() {
return itemId;
}
public void setItemId(Integer itemId) {
this.itemId = itemId;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
public Timestamp getCreated() {
return new Timestamp(System.currentTimeMillis());
}
public Timestamp getUpdated() {
return new Timestamp(System.currentTimeMillis());
}
@Override
public String toString() {
return "CartItem [id=" + id + ", userId=" + userId + ", itemId=" + itemId + ", num=" + num + ", status="
+ status + ", created=" + created + ", updated=" + updated + "]";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
CartItem other = (CartItem) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
public CartItem(Integer id, Integer userId, Integer itemId, int num, int status, Timestamp created,
Timestamp updated) {
super();
this.id = id;
this.userId = userId;
this.itemId = itemId;
this.num = num;
this.status = status;
this.created = created;
this.updated = updated;
}
public CartItem() {
super();
}
public CartItem(Integer id, Integer userId, Integer itemId, int num, int status) {
super();
this.id = id;
this.userId = userId;
this.itemId = itemId;
this.num = num;
this.status = status;
}
}CartItemImpl.java
package com.jdbc.dao.impl;
import java.sql.SQLException;
import javax.sql.rowset.CachedRowSet;
import com.jdbc.entity.CartItem;
public class CartItemImpl extends BaseDao{
/**
* 根据用户id和商品id查询购物车信息
* @param userId 用户id
* @param itemId 商品id
* @return CartItem 购物车中商品信息
* @throws SQLException
*/
public CartItem findByUserIdItemId(Integer userId,Integer itemId) throws SQLException{
String sql = "select * from ajia_cart_item where userId = ? and itemId = ?";
CartItem cartItem = null;
CachedRowSet rs = findData(sql, userId,itemId);
if (rs.next()) {
cartItem = new CartItem(rs.getInt("id"),rs.getInt("userId"),
rs.getInt("itemId"),rs.getInt("num"),rs.getInt("status"));
}
return cartItem;
}
/**
* 修改购物车商品信息的数量，状态，更新时间
* @param cartItem 被修改数量和状态的
* 原购物车商品信息
* @return int 更新的记录数
*/
public int updateStatus(CartItem cartItem){
String sql = "update ajia_cart_item set num = ?,status = ?,updated = ? where id = ?";
return update(sql, cartItem.getNum(),cartItem.getStatus(),cartItem.getUpdated()
,cartItem.getId());
}
/**
* 修改购物车商品信息的数量，更新时间
* @param cartItem 被添加数量原购物车商品信息
* @return int 更新的记录数
*/
public int updateNum(CartItem cartItem){
String sql = "update ajia_cart_item set num = ?,updated = ? where id = ?";
return update(sql, cartItem.getNum(),cartItem.getUpdated(),cartItem.getId());
}
/**
* 添加商品到购物车
* @param cartItem 购物车信息
* @return int 添加信息的数量
*/
public int save(CartItem cartItem){
String sql = "insert into ajia_cart_item(userId,itemId,num,status,created,updated) "
+ "values(?,?,?,?,?,?)";
return update(sql, cartItem.getUserId(),cartItem.getItemId(),cartItem.getNum(),
cartItem.getStatus(),cartItem.getCreated(),cartItem.getUpdated());
}
public static void main(String[] args) throws SQLException {
/**
* 查询被添加商品是否是同一个用户
* user_id item_id
*
* 如果存在数据，再查询购物车信息的状态
* 如果status=2,改数量，改状态2-1，改时间
*
* 如果status=1,改数量
* （原来的数量+新的数量），改时间
* 如果不存在数据，添加信息到购物车
*/
CartItemImpl dao = new CartItemImpl();
Integer userId = 11;
Integer itemId = 111;
int num = 5;
CartItem cartItem = dao.findByUserIdItemId(userId, itemId);
if (cartItem!=null) {
if (cartItem.getStatus()==1) {
CartItem cartItem1 = new CartItem();
cartItem1.setId(cartItem.getId());
cartItem1.setNum(cartItem.getNum()+num);
dao.updateNum(cartItem1);
}else if (cartItem.getStatus()==2) {
CartItem cartItem1 = new CartItem();
cartItem1.setId(cartItem.getId());
cartItem1.setStatus(1);
cartItem1.setNum(num);
dao.updateStatus(cartItem1);
}
}else{
CartItem cartItem1 = new CartItem();
cartItem1.setUserId(userId);
cartItem1.setItemId(itemId);
cartItem1.setNum(num);
cartItem1.setStatus(1);
dao.save(cartItem1);
}
}
}