需求分析:
后台系统中可以管理分类信息,分类包括两种信息,分别是菜品分类和套餐分类。当我们在后台系统中添加菜品时需要选择一个菜品分类,当我们在后台系统中添加一个套餐时需要选择一个套餐分类,在移动端也会按照菜品分类和套餐分类来展示对应的菜品和套餐
(1)实体类Category
package com.itheima.entity; import com.baomidou.mybatisplus.annotation.FieldFill; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableField; import com.baomidou.mybatisplus.annotation.TableId; import lombok.Data; import lombok.Getter; import lombok.Setter; import java.io.Serializable; import java.time.LocalDateTime; /** * 分类 */ @Data public class Category implements Serializable { private static final long serialVersionUID = 1L; private Long id; //类型 1 菜品分类 2 套餐分类 private Integer type; //分类名称 private String name; //顺序 private Integer sort; //创建时间 @TableField(fill = FieldFill.INSERT) private LocalDateTime createTime; //更新时间 @TableField(fill = FieldFill.INSERT_UPDATE) private LocalDateTime updateTime; //创建人 @TableField(fill = FieldFill.INSERT) private Long createUser; //修改人 @TableField(fill = FieldFill.INSERT_UPDATE) private Long updateUser; //是否删除 private Integer isDeleted; }
(2)Mapper接口CategoryMapper
package com.itheima.mapper; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.itheima.entity.Category; import org.apache.ibatis.annotations.Mapper; @Mapper public interface CategoryMapper extends BaseMapper<Category> { }
(3)业务层接口CategoryService
package com.itheima.service; import com.baomidou.mybatisplus.extension.service.IService; import com.itheima.entity.Category; public interface CategoryService extends IService<Category> { }
(4)业务层实现类CategoryServiceImpl
package com.itheima.service.impl; import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl; import com.itheima.entity.Category; import com.itheima.mapper.CategoryMapper; import com.itheima.service.CategoryService; import org.springframework.stereotype.Service; @Service public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService { }
(5)控制层CategoryController
package com.itheima.controller; import com.itheima.service.CategoryService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * 分类管理 */ @RestController @RequestMapping("/category") public class CategoryController { @Autowired private CategoryService categoryService; }
新增份分类:
1、页面发送ajax请求,将新增分类窗口输入的数据以json形式提交到服务端
2、服务端Controller接收页面提交的数据并调用Service将数据进行保存
3、Service调用Mapper操作数据库,保存数据
package com.itheima.controller;
import com.itheima.common.R;
import com.itheima.entity.Category;
import com.itheima.service.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* 分类管理
*/
@RestController
@RequestMapping("/category")
@Slf4j
public class CategoryController {
@Autowired
private CategoryService categoryService;
/**
* 新增分类
* @param category
* @return
*/
@PostMapping
public R<String> save(@RequestBody Category category){
categoryService.save(category);
log.info("category:{}", category);
return R.success("新增分类成功");
}
}
由于category中的name字段存在unique约束,因此不能重复。但此前在添加用户时已经做了全局异常处理来捕捉处理duplicate entry类异常。所以不需要再对该类异常重新定义处理方法。
标签:分类,新增,private,org,import,com,annotation,itheima From: https://www.cnblogs.com/fxzm/p/17169470.html