MyBatis - How to join multiple columns from same table - spring

Question

I'm trying to learn how to join multiple columns from one table to a single column from another table, for a given Id.
Here is my team table:
create table teams (
id varchar(10),
name varchar(30),
primary key (id)
);
Here is my teammatch table:
create table teammatch (
id integer,
firstTeamId varchar,
secondTeamId varchar,
matchId integer,
primary key(id),
foreign key (firstTeamId) references teams (id),
foreign key (secondTeamId) references teams (id)
);
My sql:
select teammatch.*, t1.*, t2.*
from teammatch
inner join teams t1 on teammatch.firstTeamId = t1.id
inner join teams t2 on teammatch.secondTeamId = t2.id
where teammatch.id = #{id}
Data:
ID FIRSTTEAMID SECONDTEAMID
1 POR DEN
2 TOR PHI
This query returns POR team for both t1 and t2 but I need it to
return POR for t1 and DEN for t2
EDIT:
This works fine when I write sql query in H2 database, but when I write it with mybatis in xml mapper file, It returns same value for both fields.
Here is my ResultMap
<resultMap id="TeamMatchMap" type="TeamMatch">
<id column="id" property="id" />
<association property="firstTeamId" column="firstTeamId" javaType="Team">
<id column="id" property="id" />
<result column="name" property="name" />
</association>
<association property="secondTeamId" column="secondTeamId" javaType="Team">
<id column="id" property="id" />
<result column="name" property="name" />
</association>
</resultMap>

Answer 1

pleasy try to change your mapper to something like this
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper>
<select id="getTeammatches"
resultMap="teamMatchMap">
select
teammatch.id as matchid ,
t1.id as firstteam_id ,
t1.name as firstteam_name,
t2.id as secondteam_id ,
t2.name as secondteam_name
from teammatch
inner join teams t1 on teammatch.firstTeamId = t1.id
inner join teams t2 on teammatch.secondTeamId = t2.id
where teammatch.id = #{id}
</select>
<resultMap type="TeamMatch" id="teamMatchMap">
<result property="id" column="MATCHID"/>
<association property="team1" columnPrefix="FIRSTTEAM_" resultMap="teamMap"/>
<association property="team2" columnPrefix="SECONDTEAM_" resultMap="teamMap"/>
</resultMap>
<resultMap type="Team" id="teamMap">
<result property="id" column="ID"/>
<result property="name" column="NAME"/>
</resultMap>
</mapper>
by declaring a separate resultMap for a Team or referring to an existing ones, you dont need to map columns twice in the body-tag of association-tag
you used the column-Attribute for association - as far as i know, its only used if you want myBatis to execute anoter select-tag
Edit
i wrote the mapper before i read your edit and comment
if your Team-class provides a contructor that takes id and name, your teamMap can also look like this
<resultMap type="Team" id="teamMap">
<constructor>
<idArg column="ID"/>
<arg column="NAME"/>
</constructor>
</resultMap>