Java在线笔记

YangeIT大约 6 分钟

day06业务题：

**训练目标：**掌握根据原型图，完成后台接口编写

**需求背景：**日常工作中，产品经理提供原型图后，由程序员完成功能实现。而实现功能的第一步，根据原型图，设计数据库表，且后台java程序需要对原型中展示的功能逐一实现。

需求描述：通过SpringBoot+Mybatis的方式完成如下菜品管理的需求

备注：根据接口文档开发接口，并给予postman/ApiFox进行测试即可，前端工程前端人员还未开发，所以无需联调测试。

图1：

操作步骤：

下载初始工程，然后导入idea中
配置mybatis的配置信息，包括数据库链接配置、日志配置、驼峰命名映射开关。
创建Controller、Service、Mapper三层架构：
1. controller层：DishController类
2. service层：DishService接口、impl-DishServiceImpl实现类
3. mapper层：DishMapper接口
resources添加DishMapper.xml映射文件。

需求：

新增菜品信息【定义mapper方法，往Dish表中插入数据】。
根据指定 ID 查询菜品信息。
定义DishMapper接口对应的XML映射配置文件，根据指定的ID 动态修改菜品的信息。【动态SQL】
根据条件，动态查询菜品信息，查询条件包括：菜品名称、分类、售卖状态：【动态SQL】+暂时不考虑多表
1. 菜品名称，支持模糊匹配
2. 状态和分类都是精确匹配
完成图片上传操作---->可以在修改菜品中，修改图片点击查看图片效果

数据准备：

数据库数据：以下代码，直接复制到数据库中运行即可。

-- 使用数据库。
use sky-take-out;
 
DROP TABLE IF EXISTS `dish`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!50503 SET character_set_client = utf8mb4 */;
CREATE TABLE `dish` (
  `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(32) COLLATE utf8_bin NOT NULL COMMENT '菜品名称',
  `category_id` bigint NOT NULL COMMENT '菜品分类id',
  `price` decimal(10,2) DEFAULT NULL COMMENT '菜品价格',
  `image` varchar(255) COLLATE utf8_bin DEFAULT NULL COMMENT '图片',
  `description` varchar(255) COLLATE utf8_bin DEFAULT NULL COMMENT '描述信息',
  `status` int DEFAULT '1' COMMENT '0 停售 1 起售',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  `update_time` datetime DEFAULT NULL COMMENT '更新时间',
  `create_user` bigint DEFAULT NULL COMMENT '创建人',
  `update_user` bigint DEFAULT NULL COMMENT '修改人',
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_dish_name` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=70 DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin COMMENT='菜品';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Dumping data for table `dish`
--

/*!40000 ALTER TABLE `dish` DISABLE KEYS */;
INSERT INTO `dish` VALUES (46,'王老吉',11,6.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/41bfcacf-7ad4-4927-8b26-df366553a94c.png','',1,'2022-06-09 22:40:47','2022-06-09 22:40:47',1,1);
INSERT INTO `dish` VALUES (47,'北冰洋',11,4.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/4451d4be-89a2-4939-9c69-3a87151cb979.png','还是小时候的味道',1,'2022-06-10 09:18:49','2022-06-10 09:18:49',1,1);
INSERT INTO `dish` VALUES (48,'雪花啤酒',11,4.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/bf8cbfc1-04d2-40e8-9826-061ee41ab87c.png','',1,'2022-06-10 09:22:54','2022-06-10 09:22:54',1,1);
INSERT INTO `dish` VALUES (49,'米饭',12,2.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/76752350-2121-44d2-b477-10791c23a8ec.png','精选五常大米',1,'2022-06-10 09:30:17','2022-06-10 09:30:17',1,1);
INSERT INTO `dish` VALUES (50,'馒头',12,1.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/475cc599-8661-4899-8f9e-121dd8ef7d02.png','优质面粉',1,'2022-06-10 09:34:28','2022-06-10 09:34:28',1,1);
INSERT INTO `dish` VALUES (51,'老坛酸菜鱼',20,56.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/4a9cefba-6a74-467e-9fde-6e687ea725d7.png','原料：汤，草鱼，酸菜',1,'2022-06-10 09:40:51','2022-06-10 09:40:51',1,1);
INSERT INTO `dish` VALUES (52,'经典酸菜鮰鱼',20,66.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/5260ff39-986c-4a97-8850-2ec8c7583efc.png','原料：酸菜，江团，鮰鱼',1,'2022-06-10 09:46:02','2022-06-10 09:46:02',1,1);
INSERT INTO `dish` VALUES (53,'蜀味水煮草鱼',20,38.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/a6953d5a-4c18-4b30-9319-4926ee77261f.png','原料：草鱼，汤',1,'2022-06-10 09:48:37','2022-06-10 09:48:37',1,1);
INSERT INTO `dish` VALUES (54,'清炒小油菜',19,18.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/3613d38e-5614-41c2-90ed-ff175bf50716.png','原料：小油菜',1,'2022-06-10 09:51:46','2022-06-10 09:51:46',1,1);
INSERT INTO `dish` VALUES (55,'蒜蓉娃娃菜',19,18.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/4879ed66-3860-4b28-ba14-306ac025fdec.png','原料：蒜，娃娃菜',1,'2022-06-10 09:53:37','2022-06-10 09:53:37',1,1);
INSERT INTO `dish` VALUES (56,'清炒西兰花',19,18.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/e9ec4ba4-4b22-4fc8-9be0-4946e6aeb937.png','原料：西兰花',1,'2022-06-10 09:55:44','2022-06-10 09:55:44',1,1);
INSERT INTO `dish` VALUES (57,'炝炒圆白菜',19,18.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/22f59feb-0d44-430e-a6cd-6a49f27453ca.png','原料：圆白菜',1,'2022-06-10 09:58:35','2022-06-10 09:58:35',1,1);
INSERT INTO `dish` VALUES (58,'清蒸鲈鱼',18,98.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/c18b5c67-3b71-466c-a75a-e63c6449f21c.png','原料：鲈鱼',1,'2022-06-10 10:12:28','2022-06-10 10:12:28',1,1);
INSERT INTO `dish` VALUES (59,'东坡肘子',18,138.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/a80a4b8c-c93e-4f43-ac8a-856b0d5cc451.png','原料：猪肘棒',1,'2022-06-10 10:24:03','2022-06-10 10:24:03',1,1);
INSERT INTO `dish` VALUES (60,'梅菜扣肉',18,58.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/6080b118-e30a-4577-aab4-45042e3f88be.png','原料：猪肉，梅菜',1,'2022-06-10 10:26:03','2022-06-10 10:26:03',1,1);
INSERT INTO `dish` VALUES (61,'剁椒鱼头',18,66.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/13da832f-ef2c-484d-8370-5934a1045a06.png','原料：鲢鱼，剁椒',1,'2022-06-10 10:28:54','2022-06-10 10:28:54',1,1);
INSERT INTO `dish` VALUES (62,'金汤酸菜牛蛙',17,88.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/7694a5d8-7938-4e9d-8b9e-2075983a2e38.png','原料：鲜活牛蛙，酸菜',1,'2022-06-10 10:33:05','2022-06-10 10:33:05',1,1);
INSERT INTO `dish` VALUES (63,'香锅牛蛙',17,88.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/f5ac8455-4793-450c-97ba-173795c34626.png','配料：鲜活牛蛙，莲藕，青笋',1,'2022-06-10 10:35:40','2022-06-10 10:35:40',1,1);
INSERT INTO `dish` VALUES (64,'馋嘴牛蛙',17,88.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/7a55b845-1f2b-41fa-9486-76d187ee9ee1.png','配料：鲜活牛蛙，丝瓜，黄豆芽',1,'2022-06-10 10:37:52','2022-06-10 10:37:52',1,1);
INSERT INTO `dish` VALUES (65,'草鱼2斤',16,68.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/b544d3ba-a1ae-4d20-a860-81cb5dec9e03.png','原料：草鱼，黄豆芽，莲藕',1,'2022-06-10 10:41:08','2022-06-10 10:41:08',1,1);
INSERT INTO `dish` VALUES (66,'江团鱼2斤',16,119.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/a101a1e9-8f8b-47b2-afa4-1abd47ea0a87.png','配料：江团鱼，黄豆芽，莲藕',1,'2022-06-10 10:42:42','2022-06-10 10:42:42',1,1);
INSERT INTO `dish` VALUES (67,'鮰鱼2斤',16,72.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/8cfcc576-4b66-4a09-ac68-ad5b273c2590.png','原料：鮰鱼，黄豆芽，莲藕',1,'2022-06-10 10:43:56','2022-06-10 10:43:56',1,1);
INSERT INTO `dish` VALUES (68,'鸡蛋汤',21,4.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/c09a0ee8-9d19-428d-81b9-746221824113.png','配料：鸡蛋，紫菜',1,'2022-06-10 10:54:25','2022-06-10 10:54:25',1,1);
INSERT INTO `dish` VALUES (69,'平菇豆腐汤',21,6.00,'https://sky-itcast.oss-cn-beijing.aliyuncs.com/16d0a3d6-2253-4cfc-9b49-bf7bd9eb2ad2.png','配料：豆腐，平菇',1,'2022-06-10 10:55:02','2022-06-10 10:55:02',1,1);
/*!40000 ALTER TABLE `dish` ENABLE KEYS */;

实体类：以下代码，直接复制到idea中pojo包下即可。

public class Dish implements Serializable {
    private static final long serialVersionUID = 1L;
    private Long id;
    //菜品名称
    private String name;
    //菜品分类id
    private Long categoryId;
    //菜品价格
    private BigDecimal price;
    //图片
    private String image;
    //描述信息
    private String description;
    //0 停售 1 起售
    private Integer status;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
    private Long createUser;
    private Long updateUser;
}

# day06业务题：

day06业务题：