本文主要介紹了mybatis Plus 多表聯合查詢，分享給大家，具體如下：

//實體類package com.sk.skkill.entity;import com.baomidou.mybatisplus.annotation.TableField;import com.baomidou.mybatisplus.annotation.TableName;import lombok.Data;import java.io.Serializable;import java.util.Date;import java.util.List;@TableName('orders')@Datapublic class Order implements Serializable{ public static final long serialVersionUID =1L; private String id; private String orderName; private Date createTime; private Date updateTime; private String userID; @TableField(exist = false) private List<Users> listUsers; public Order(){ } public Order(String id, String orderName) { this.id = id; this.orderName = orderName; }}

//dao層package com.sk.skkill.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.sk.skkill.entity.Order;import com.sun.javafx.collections.MappingChange;import org.apache.ibatis.annotations.Select;import java.util.List;import java.util.Map;public interface OrderMapper extends BaseMapper<Order>{List<Order> selectOrder();int addOrder(Order order);

//多表聯合查詢 按條件orderID@Select('select t1.*,t2.user_name,t2.nick_name from orders t1 LEFT JOIN users t2 ON t1.user_id =t2.id WHERE t1.user_id= #{id}') List<Map<String,Object>> orderUserList(Page<Map<String,Object>> page,String id);}

//service層package com.sk.skkill.service;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.baomidou.mybatisplus.extension.service.IService;import com.sk.skkill.entity.Order;import java.util.List;import java.util.Map;public interface OrderService extends IService<Order>{ List<Order> selectOrder(); int addOrder(Order order);// List<Map<String,Object>> orderUserList(Page<Map<String,Object>> page, String id); Page<Map<String,Object>> selectListPage(int current,int number,String id);}

//serviceImpl層package com.sk.skkill.service.impl;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;import com.sk.skkill.entity.Order;import com.sk.skkill.mapper.OrderMapper;import com.sk.skkill.service.OrderService;import org.springframework.stereotype.Service;import java.util.List;import java.util.Map;@Servicepublic class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements OrderService{ @Override public List<Order> selectOrder() { return baseMapper.selectList(null); } @Override public int addOrder(Order order) { return baseMapper.insert(order); } @Override public Page<Map<String, Object>> selectListPage(int current, int number,String id) { //新建分頁 Page<Map<String,Object>> page =new Page<Map<String,Object>>(current,number); //返回結果 return page.setRecords(this.baseMapper.orderUserList(page,id)); }}

//controller層 package com.sk.skkill.controller;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.sk.skkill.entity.Order;import com.sk.skkill.service.impl.OrderServiceImpl;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.List;import java.util.Map;@RestController@RequestMapping('order')public class OrderController{ @Autowired private OrderServiceImpl service; @RequestMapping('selectOrder') public List<Order> selectOrder() { return service.selectOrder(); } @RequestMapping('addOrder') public int addOrder(Order order){ order=new Order('FGGG','蒙牛MILK'); return service.addOrder(order); } @RequestMapping('selectListPage') public List<Map<String,Object>> selectListPage(String id) { Page<Map<String, Object>> page = service.selectListPage(1, 2,id); return page.getRecords(); }}

到此這篇關于mybatis Plus 多表聯合查詢的實現示例的文章就介紹到這了,更多相關mybatis Plus 多表聯合查詢內容請搜索好吧啦網以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持好吧啦網！