用springboot,在表cart(cartid,cid,uid,cnum,cprice,cartselected),orders(oid,uid,cid,ocondition,oprice,ocount)的基础上实现购物车功能，代码包括html,entity,repository,service,controller

好的，以下是使用Spring Boot实现购物车功能的代码： 1. 实体类 Cart.java: ```java @Entity @Table(name = "cart") public class Cart { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long cartid; private Long cid; private Long uid; private Integer cnum; private Double cprice; private Boolean cartselected; // constructor, getter, setter, toString } ``` 2. 实体类 Orders.java: ```java @Entity @Table(name = "orders") public class Orders { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long oid; private Long uid; private Long cid; private String ocondition; private Double oprice; private Integer ocount; // constructor, getter, setter, toString } ``` 3. CartRepository.java: ```java @Repository public interface CartRepository extends JpaRepository<Cart, Long> { List<Cart> findByUid(Long uid); Cart findByUidAndCid(Long uid, Long cid); void deleteByUidAndCid(Long uid, Long cid); } ``` 4. OrdersRepository.java: ```java @Repository public interface OrdersRepository extends JpaRepository<Orders, Long> { List<Orders> findByUid(Long uid); void deleteByUidAndCid(Long uid, Long cid); } ``` 5. CartService.java: ```java @Service public class CartService { @Autowired private CartRepository cartRepository; public List<Cart> findAllCartsByUid(Long uid) { return cartRepository.findByUid(uid); } public void addCart(Cart cart) { Cart existingCart = cartRepository.findByUidAndCid(cart.getUid(), cart.getCid()); if (existingCart != null) { existingCart.setCnum(existingCart.getCnum() + cart.getCnum()); cartRepository.save(existingCart); } else { cart.setCartselected(true); cartRepository.save(cart); } } public void deleteCart(Long uid, Long cid) { cartRepository.deleteByUidAndCid(uid, cid); } } ``` 6. OrdersService.java: ```java @Service public class OrdersService { @Autowired private OrdersRepository ordersRepository; @Autowired private CartRepository cartRepository; public List<Orders> findAllOrdersByUid(Long uid) { return ordersRepository.findByUid(uid); } public void addOrders(Orders orders) { ordersRepository.save(orders); cartRepository.deleteByUidAndCid(orders.getUid(), orders.getCid()); } } ``` 7. CartController.java: ```java @RestController @RequestMapping("/cart") public class CartController { @Autowired private CartService cartService; @GetMapping("/{uid}") public List<Cart> findAllCartsByUid(@PathVariable Long uid) { return cartService.findAllCartsByUid(uid); } @PostMapping public void addCart(@RequestBody Cart cart) { cartService.addCart(cart); } @DeleteMapping("/{uid}/{cid}") public void deleteCart(@PathVariable Long uid, @PathVariable Long cid) { cartService.deleteCart(uid, cid); } } ``` 8. OrdersController.java: ```java @RestController @RequestMapping("/orders") public class OrdersController { @Autowired private OrdersService ordersService; @GetMapping("/{uid}") public List<Orders> findAllOrdersByUid(@PathVariable Long uid) { return ordersService.findAllOrdersByUid(uid); } @PostMapping public void addOrders(@RequestBody Orders orders) { ordersService.addOrders(orders); } } ``` 9. HTML页面的实现，可以参考以下代码： ```html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>购物车</title> </head> <body> <table> <tr> <th>商品ID</th> <th>商品名称</th> <th>商品数量</th> <th>商品单价</th> <th>操作</th> </tr> <tbody id="cart-list"> </tbody> </table> <button onclick="handleCheckout()">结算</button> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script> const uid = 123; // 假设当前用户ID为123 // 获取购物车列表 function getCartList() { $.get(`/cart/${uid}`, function (data) { let html = ''; data.forEach(item => { html += ` <tr> <td>${item.cid}</td> <td>${item.cname}</td> <td>${item.cnum}</td> <td>${item.cprice}</td> <td> <button onclick="handleDelete(${item.cid})">删除</button> </td> </tr> `; }); $('#cart-list').html(html); }); } // 添加商品到购物车 function handleAdd(cid, cname, cprice) { const cnum = 1; // 添加商品数量默认为1 const data = {cid, cname, uid, cnum, cprice, cartselected: true}; $.post('/cart', data, function () { getCartList(); }); } // 从购物车删除商品 function handleDelete(cid) { $.ajax({ url: `/cart/${uid}/${cid}`, type: 'DELETE', success: function () { getCartList(); } }); } // 结算 function handleCheckout() { $.get(`/cart/${uid}`, function (data) { data.forEach(item => { const orders = { uid, cid: item.cid, ocondition: '待支付', oprice: item.cprice, ocount: item.cnum }; $.post('/orders', orders, function () { getCartList(); }); }); }); } $(function () { getCartList(); }); </script> </body> </html> ``` 以上是实现购物车功能的完整代码，可以根据需要进行改进和优化。

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用springboot,在表cart(cartid,cid,uid,cnum,cprice,cartselected),orders(oid,uid,cid,ocondition,oprice,ocount)的基础上实现购物车功能，代码包括html,entity,repository,service,controller

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用springboot,在表cart(cartid,cid,uid,cnum,cprice,cartselected),orders(oid,uid,cid,ocondition,oprice,ocount)的基础上实现购物车功能，代码包括html,entity,service,controller

帮我在user（uid，uname,upwd）,commodity(cid,cname,cprice),cart(cartid,uid,cid,cnum,cartprice，cartselected)三个表的基础上，用springboot 、maven完成购物车功能，包括entiity,controller,service,reposity，HTML等文件，告诉我代码

请根据user（uid,uname,upwd）,commodity(cid,cname,cprice,cinventory),cart(cartid,cid,uid,cnum)三个表使用springboot帮我实现购物车功能，包括entity，service、controller、html、repository相关文件和完整代码

cnum：西多数字

cnum.rar_源码

int main (void){ struct cmplx { int x； int y；}cnum [2]= {1,3,2,7}； printf ("%d\n",cnum [0].y/cnum [0].x*cnum [1].x)； return 0；}

int main (void){ struct cmplx { int x； int y；}cnum [2]= {1,3,2,7}； printf ("%d\n",cnum [0].y/cnum [0].x*cnum [1].x)； return 0；}的运行结果

#include <stdio.h> int main() { struct complx { int x; int y; } cnum[2] = { 1, 3, 2, 7 }; printf( "%d", cnum[0].y / cnum[0].x * cnum[1].x ); return(0); }

#include <stdio.h> int main() { struct cmplx { int x, y; }; struct cmplx cnum[2] = {1, 3, 2, 7}; printf("%d\n", cnum[0].y / cnum[0].x * cnum[1].x); return 0; }的运行结果

void Sort_by_cnum(cour *head) { cour cour_sort; int i,j; for(i=0;i<cour_cnum-1;i++) { for(j=0;j<cour_cnum-1;j++) { if(strcmp(cour[j].cnum,cour[j+1].cnum)>0) { cour_sort=cour[j]; cour[j]=cour[j+1]; cour[j+1]=cour_sort; } } } }

下面程序的执行结果是：（________）。 #include "stdio.h" struct cmplx { int x; int y; }cnum[2]={1,3,2,7}; int main() { printf("%d \n",cnum[0].y/cnum[0].x*cnum[1].x); return 0; }

写出SQL语句，查询所选课程成绩都大于等于80分(提示：使用having)的学生信息，包括Sno、Sname、CNUM，cnum表示所选课程门数列

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