springboot + Mybatis-plus
本文共 17477 字，大约阅读时间需要 58 分钟。
这是一个springboot 和 layui的小demo（单体应用）
第一步：创建数据库
-- MySQL dump 10.13 Distrib 8.0.19, for Win64 (x86_64)---- Host: 127.0.0.1 Database: mmall-- -------------------------------------------------------- Server version 8.0.19/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;/*!50503 SET NAMES utf8mb4 */;/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;/*!40103 SET TIME_ZONE='+00:00' */;/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;---- Table structure for table `product`--DROP TABLE IF EXISTS `product`;/*!40101 SET @saved_cs_client = @@character_set_client */;/*!50503 SET character_set_client = utf8mb4 */;CREATE TABLE `product` ( `id` int NOT NULL AUTO_INCREMENT COMMENT '主键', `name` varchar(200) NOT NULL COMMENT '名称', `description` varchar(1024) DEFAULT NULL COMMENT '描述', `price` float NOT NULL COMMENT '价格', `stock` int NOT NULL COMMENT '库存', `categorylevelone_id` int DEFAULT NULL COMMENT '分类1', `categoryleveltwo_id` int DEFAULT NULL COMMENT '分类2', `categorylevelthree_id` int DEFAULT NULL COMMENT '分类3', `file_name` varchar(200) DEFAULT NULL COMMENT '文件名称', PRIMARY KEY (`id`), UNIQUE KEY `PK__EASYBUY___94F6E55132E0915F` (`id`)) ENGINE=InnoDB AUTO_INCREMENT=777 DEFAULT CHARSET=utf8;/*!40101 SET character_set_client = @saved_cs_client */;---- Dumping data for table `product`--LOCK TABLES `product` WRITE;/*!40000 ALTER TABLE `product` DISABLE KEYS */;INSERT INTO `product` VALUES (733,'香奈儿','好闻的香水！！！',152,978,548,654,655,'baby_1.jpg'),(734,'洗面奶','',152.5,10,548,654,655,'baby_2.jpg'),(735,'啫喱水','',152,959,548,654,655,'baby_3.jpg'),(736,'香水','',152,1000,548,654,655,'baby_4.jpg'),(737,'香水','',152,111,548,654,655,'baby_5.jpg'),(738,'润肤露','',45,99,548,654,655,'baby_6.jpg'),(739,'洁面装','',156,33,548,654,655,'bk_2.jpg'),(740,'电饭锅','',158,94,628,656,659,'bk_1.jpg'),(741,'婴儿喂奶装','',569,100,632,637,653,'bk_3.jpg'),(742,'坚果套餐','',158,1000,660,661,662,'bk_4.jpg'),(743,'超甜蜜崭','',589,1000,660,661,663,'bk_5.jpg'),(744,'华为2566','',589,1000,670,671,672,'de1.jpg'),(745,'荣耀3C','',589,92,670,671,672,'de2.jpg'),(746,'小米手环','',963,98,670,674,675,'de3.jpg'),(747,'华为2265','',896,1000,670,671,673,'de4.jpg'),(748,'越南坚果','',520,1,660,661,662,'de5.jpg'),(749,'日本进口马桶','',5866,100,628,657,0,'food_1.jpg'),(750,'联想Y系列','',569,894,670,690,691,'food_2.jpg'),(751,'脑白金1号','',589,1000,676,677,680,'food_3.jpg'),(752,'莫里斯按','',589,1000,676,678,0,'food_4.jpg'),(753,'三鹿好奶粉','',859,100,676,679,0,'food_5.jpg'),(754,'儿童牛奶','',5896,100,676,679,0,'food_6.jpg'),(755,'软沙发','',8596,99,628,696,0,'food_b1.jpg'),(756,'收纳盒','',5966,100,628,696,0,'food_b2.jpg'),(757,'洗衣液','',58,1000,628,696,0,'food_r.jpg'),(758,'红短沙发','',596,113,628,696,0,'fre_1.jpg'),(759,'新西兰奶粉','',5896,100,676,679,0,'fre_2.jpg'),(760,'婴儿车','',11000,100,681,682,687,'fre_3.jpg'),(761,'夏款婴儿车','',963,99,681,682,688,'fre_4.jpg'),(762,'抗压旅行箱','',569,1000,681,683,685,'fre_5.jpg'),(763,'透明手提箱','',8596,1000,681,683,684,'fre_6.jpg'),(764,'婴儿果粉','',5896,999,660,661,662,'milk_1.jpg'),(765,'椰子粉','',5963,1000,660,661,662,'milk_2.jpg'),(766,'坚果蛋糕','',200,98,660,661,663,'milk_3.jpg'),(767,'编制手提箱','',5896,1000,681,682,688,'milk_4.jpg'),(768,'纸箱','',5896,3,681,682,687,'milk_5.jpg'),(769,'健胃液','',152,1000,676,679,0,'milk_6.jpg'),(770,'联想NTC','',8596,100,670,671,673,'milk_7.jpg'),(771,'香水1',NULL,100,100,548,654,655,'milk_8.jpg'),(772,'香水2',NULL,100,100,548,654,655,'pro1.jpg'),(773,'香水3',NULL,100,100,548,654,655,'pro2.jpg'),(774,'香水4',NULL,100,100,548,654,655,'pro3.jpg'),(775,'香水5',NULL,100,100,548,654,655,'pro4.jpg'),(776,'香水6',NULL,1,1,548,654,655,'pro5.jpg');/*!40000 ALTER TABLE `product` ENABLE KEYS */;UNLOCK TABLES;---- Table structure for table `product_category`--DROP TABLE IF EXISTS `product_category`;/*!40101 SET @saved_cs_client = @@character_set_client */;/*!50503 SET character_set_client = utf8mb4 */;CREATE TABLE `product_category` ( `id` int NOT NULL AUTO_INCREMENT COMMENT '主键', `name` varchar(20) NOT NULL COMMENT '名称', `parent_id` int NOT NULL COMMENT '父级目录id', `type` int DEFAULT NULL COMMENT '级别(1:一级 2：二级 3：三级)', PRIMARY KEY (`id`), UNIQUE KEY `PK__EASYBUY___9EC2A4E236B12243` (`id`)) ENGINE=InnoDB AUTO_INCREMENT=697 DEFAULT CHARSET=utf8;/*!40101 SET character_set_client = @saved_cs_client */;---- Dumping data for table `product_category`--LOCK TABLES `product_category` WRITE;/*!40000 ALTER TABLE `product_category` DISABLE KEYS */;INSERT INTO `product_category` VALUES (548,'化妆品',0,1),(628,'家用商品',0,1),(654,'面部护理',548,2),(655,'少女派',654,3),(656,'餐具',628,2),(657,'卫具',628,2),(658,'叉子',656,3),(659,'锅',656,3),(660,'进口食品',0,1),(661,'零食/糖果/巧克力',660,2),(662,'坚果',661,3),(663,'蜜饯',661,3),(669,'孕期教育',546,3),(670,'电子商品',0,1),(671,'手机',670,2),(672,'华为手机',671,3),(673,'联想手机',671,3),(674,'手环',670,2),(675,'小米手环',674,3),(676,'保健食品',0,1),(677,'老年保健品',676,2),(678,'中年营养品',676,2),(679,'儿童保健品',676,2),(680,'脑白金',677,3),(681,'箱包',0,1),(682,'旅行箱',681,2),(683,'手提箱',681,2),(684,'大型',683,3),(685,'小型',683,3),(686,'中型',683,3),(687,'大型',682,3),(688,'中型',682,3),(689,'小型',682,3),(690,'电脑',670,2),(691,'联想电脑',690,3),(692,'刀叉',656,3),(693,'碗筷',656,3),(696,'客厅专用',628,2);/*!40000 ALTER TABLE `product_category` ENABLE KEYS */;UNLOCK TABLES;---- Table structure for table `order_detail`--DROP TABLE IF EXISTS `order_detail`;/*!40101 SET @saved_cs_client = @@character_set_client */;/*!50503 SET character_set_client = utf8mb4 */;CREATE TABLE `order_detail` ( `id` int NOT NULL AUTO_INCREMENT COMMENT '主键', `order_id` int NOT NULL COMMENT '订单主键', `product_id` int NOT NULL COMMENT '商品主键', `quantity` int NOT NULL COMMENT '数量', `cost` float NOT NULL COMMENT '消费', PRIMARY KEY (`id`), UNIQUE KEY `PK__EASYBUY___66E1BD8E2F10007B` (`id`)) ENGINE=InnoDB AUTO_INCREMENT=123 DEFAULT CHARSET=utf8;/*!40101 SET character_set_client = @saved_cs_client */;---- Dumping data for table `order_detail`--LOCK TABLES `order_detail` WRITE;/*!40000 ALTER TABLE `order_detail` DISABLE KEYS */;INSERT INTO `order_detail` VALUES (115,133,735,4,608),(116,133,745,3,1767),(117,134,738,10,450),(118,134,739,66,10296),(119,134,758,10,5960),(120,134,735,33,5016),(121,134,740,6,948),(122,134,750,100,56900);/*!40000 ALTER TABLE `order_detail` ENABLE KEYS */;UNLOCK TABLES;/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;-- Dump completed on 2020-06-01 14:06:09
第二部： 创建实体类 pojo
package com.jsp.pojo.admin;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class product { private Integer id; private String name; private String description; private Float price; private Integer stock; private Integer categoryleveloneId; private Integer categoryleveltwoId; private Integer categorylevelthreeId; private String fileName;} package com.jsp.pojo.admin;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@AllArgsConstructor@NoArgsConstructorpublic class ProductCategory { private Integer id; private String name;} 第三步：创建VO ：view object ：为了返回数据
- data.json
{ "code": 0 ,"msg": "" ,"count": 3000000 ,"data": [{ "id": "10001" ,"name": "香奈儿" ,"description": "好闻的香水！！！" ,"price": 152 ,"stock": 978 ,"categorylevelone": "化妆品" ,"categoryleveltwo": "面部护理" ,"categorylevelthree": "少女派" ,"fileName": "baby_1.jpg" }, { "id": "10001" ,"name": "香奈儿" ,"description": "好闻的香水！！！" ,"price": 152 ,"stock": 978 ,"categorylevelone": "化妆品" ,"categoryleveltwo": "面部护理" ,"categorylevelthree": "少女派" ,"fileName": "baby_1.jpg" }, { "id": "10001" ,"name": "香奈儿" ,"description": "好闻的香水！！！" ,"price": 152 ,"stock": 978 ,"categorylevelone": "化妆品" ,"categoryleveltwo": "面部护理" ,"categorylevelthree": "少女派" ,"fileName": "baby_1.jpg" }]} 1.DataVO
package com.jsp.vo;import lombok.Data;import java.util.List;@Datapublic class DataVO{ private Integer code; private String msg; private Integer count; private List data;}
2.productVO
package com.jsp.vo;import lombok.Data;@Datapublic class ProductVO { private Integer id; private String name; private String description; private Float price; private Integer stock; private String categorylevelone; private String categoryleveltwo; private String categorylevelthree; private String fileName;} 第四步：mapper层
package com.jsp.dao;import com.jsp.pojo.admin.product;import com.jsp.vo.ProductVO;import org.apache.ibatis.annotations.Select;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import java.util.List;public interface ProductMapper extends BaseMapper{ //查询全部 @Select("select p.name,sum(quantity) count from order_detail od,product p where od.product_id = p.id group by product_id") public List findAllProductBarVO();}
package com.jsp.dao;import com.jsp.pojo.admin.ProductCategory;import com.baomidou.mybatisplus.core.mapper.BaseMapper;public interface ProductCategoryMapper extends BaseMapper{ }
第五步：service层
package com.jsp.service.impl;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;import com.jsp.dao.ProductCategoryMapper;import com.jsp.dao.ProductMapper;import com.jsp.pojo.admin.ProductCategory;import com.jsp.pojo.admin.product;import com.jsp.service.ProductService;import com.jsp.vo.BarVO;import com.jsp.vo.DataVO;import com.jsp.vo.PieVO;import com.jsp.vo.ProductVO;import org.springframework.beans.BeanUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.ArrayList;import java.util.List;@Servicepublic class ProductServiceImpl implements ProductService { @Autowired private ProductMapper productMapper; @Autowired private ProductCategoryMapper productCategoryMapper; @Override public DataVO findData() { //返回数据 code msg count DataVO dataVO = new DataVO(); dataVO.setCode(0); dataVO.setMsg(""); dataVO.setCount(productMapper.selectCount(null)); //返回 data : //首先把所有数据查询出来 List productList = productMapper.selectList(null); //转换为VO类型的 List productVoList = new ArrayList<>(); for (product product : productList) { ProductVO productVO = new ProductVO(); //将product转换为productVO BeanUtils.copyProperties(product, productVO); QueryWrapper wrapper = new QueryWrapper(); wrapper.eq("id", product.getCategoryleveloneId()); ProductCategory productCategory = productCategoryMapper.selectOne(wrapper); //防止nullpoint if (productCategory != null) { productVO.setCategorylevelone(productCategory.getName()); } wrapper.eq("id", product.getCategoryleveltwoId()); productCategory = productCategoryMapper.selectOne(wrapper); if (productCategory != null) { productVO.setCategoryleveltwo(productCategory.getName()); } wrapper.eq("id", product.getCategorylevelthreeId()); productCategory = productCategoryMapper.selectOne(wrapper); if (productCategory != null) { productVO.setCategorylevelthree(productCategory.getName()); } //把VO放进List里 productVoList.add(productVO); } dataVO.setData(productList); return dataVO; } @Override public BarVO getBarVO() { return null; } @Override public List getPieVO() { return null; }} 第六步：Controller层
package com.jsp.controller;import com.jsp.service.ProductService;import com.jsp.vo.DataVO;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class ProductController { @Autowired private ProductService productService; @GetMapping("/list") public DataVO list() { return productService.findData(); }} - 注意 ：
Result
分页
1: 修改ProductServicrImpl
package com.jsp.service.impl;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;import com.baomidou.mybatisplus.core.metadata.IPage;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.jsp.dao.ProductCategoryMapper;import com.jsp.dao.ProductMapper;import com.jsp.pojo.admin.ProductCategory;import com.jsp.pojo.admin.product;import com.jsp.service.ProductService;import com.jsp.vo.BarVO;import com.jsp.vo.DataVO;import com.jsp.vo.PieVO;import com.jsp.vo.ProductVO;import org.springframework.beans.BeanUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.ArrayList;import java.util.List;@Servicepublic class ProductServiceImpl implements ProductService { @Autowired private ProductMapper productMapper; @Autowired private ProductCategoryMapper productCategoryMapper; @Override public DataVO findData(Integer page,Integer limit) { //返回数据 code msg count DataVO dataVO = new DataVO(); dataVO.setCode(0); dataVO.setMsg(""); //分页 IPage productPage = new Page<>(page,limit); IPage selectPage = productMapper.selectPage(productPage, null); dataVO.setCount(selectPage.getTotal()); //返回 data : //首先把所有数据查询出来 List productList = selectPage.getRecords(); //转换为VO类型的 List productVoList = new ArrayList<>(); for (product product : productList) { ProductVO productVO = new ProductVO(); //将product转换为productVO BeanUtils.copyProperties(product, productVO); QueryWrapper wrapper = new QueryWrapper(); wrapper.eq("id", product.getCategoryleveloneId()); ProductCategory productCategory = productCategoryMapper.selectOne(wrapper); //防止nullpoint if (productCategory != null) { productVO.setCategorylevelone(productCategory.getName()); } wrapper = new QueryWrapper(); wrapper.eq("id", product.getCategoryleveltwoId()); productCategory = productCategoryMapper.selectOne(wrapper); if (productCategory != null) { productVO.setCategoryleveltwo(productCategory.getName()); } wrapper = new QueryWrapper(); wrapper.eq("id", product.getCategorylevelthreeId()); productCategory = productCategoryMapper.selectOne(wrapper); if (productCategory != null) { productVO.setCategorylevelthree(productCategory.getName()); } //把VO放进List里 productVoList.add(productVO); } dataVO.setData(productList); return dataVO; } @Override public BarVO getBarVO() { return null; } @Override public List getPieVO() { return null; }} 2:修改Controller
package com.jsp.controller;import com.jsp.service.ProductService;import com.jsp.vo.DataVO;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.*;//@RestController@Controllerpublic class ProductController { @Autowired private ProductService productService; @RequestMapping("/list") @ResponseBody public DataVO list(Integer page,Integer limit) { return productService.findData(page , limit); } @GetMapping("/{url}") public String redirect(@PathVariable("url") String url) { return url; }} Layui后台模板-admin
贤心 效果图:
小总结 :
- 前后端分离思想 ：前端有自己的服务器 后端有自己的服务器 ，前端可以调用后端的数据 后端只需要给前端开放一个接口即可。
- 在使用VO类的时候是为了将数据库中的数据封装成符合前端展示的格式，要注意观察表结构和字段类型
- 所谓的单体应用就是将Layui放进springboot中修改url 路径就行了
- 数据库的设计很重要！！！
未完 待更！！！
转载地址：http://pjyki.baihongyu.com/
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