我要评论本文主要介绍了mybatis plus 多表联合查询，分享给大家，具体如下：
//实体类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")
@data
public 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层
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);
//多表联合查询 按条件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层
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层
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;
@service
public 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) {
//新建分页
page<map<string,object>> page =new page<map<string,object>>(current,number);
//返回结果
return page.setrecords(this.basemapper.orderuserlist(page,id));
}
}
//controller层
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();
}
}
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