Springboot图书管理系统（MybatisPlus）

package com.itheima.Contorller; import com.itheima.bean.Book; import com.itheima.common.Result; import com.itheima.service.BookService; import org.apache.ibatis.annotations.Delete; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; /** 控制层，业务控制，就是控制业务层Service的， 它的作用主要是架起了外界与业务层沟通的桥梁，移动端， 前端在调用接口访问相关业务时， 都会通过Controller， 由Controller去调相关的业务层代码并把数据返回给移动端和前端。 */ @RestController @RequestMapping("/books") public class BookController { @Autowired/**页面查询功能*/ private BookService bookService; @GetMapping public Result<List<Book>> getAll(){ List<Book>list= bookService.list(); if (list.size()<=0){ return Result.error(0,"查询失败，请重新查询"); } return Result.success(1,list); } @PostMapping/**页面添加功能**/ public Result<String> save(@RequestBody Book book){ boolean flag = bookService.save(book); if (flag){ return Result.success(20011,"添加成功"); } return Result.error(20010,"添加失败"); } @GetMapping("/{id}")/**页面编辑功能 */ public Result<String> getById(@PathVariable Integer id){ Book book=bookService.getById(id); if (book!=null){ return Result.error(20040,"查询失败，请重新操作"); } return Result.success(20041,book); } @PutMapping public Result<String> update(@RequestBody Book book){ boolean flag = bookService.updateById(book); if (flag){ return Result.success(20031,"修改成功"); } return Result.error(20030,"修改失败"); } @DeleteMapping("/{id}") public Result<String> delete(@PathVariable Integer id) { boolean b = bookService.removeById(id); if (b) { return Result.success(20021, "删除成功"); } return Result.error(20020,"删除失败"); } }