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From "Gareth Moorst" <Gareth.Moo...@Phones4u.co.uk>
Subject FW: Keyed sub selects
Date Mon, 17 Oct 2005 07:40:17 GMT
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-----Original Message-----
From: Gareth Moorst 
Sent: 11 October 2005 15:35
To: 'user-java@ibatis.apache.org'
Subject: FW: Keyed sub selects

Sorry if this show up three times - I posted it twice last week, and haven't yet seen it show,
so here it is again.

I want to be able to do a subselect where the child objects have a specific position in the
My database has three tables - 

Team (the parent)
Player (the child)
TeamPlayer (the relationship between them)

The Team and Player tables each have a primary key, and the TeamPlayer table has reference
to a team, a player, and the squad number of that player in the team.
Each player can be in one team or no team.

Can I implement this kind of relationship in Ibatis without having to implement a separate
class for the TeamPlayer table?
I'd like to be able to use ibatis to insert the player objects at the right position in the
team object (using squad number as key in a hashmap, say) but I'm at a loss as to how to build
my sqlmap.

Currently I have Java objects:

public interface Team
	public void setName(String name); //PK
	public void getName();
	public void getPlayer(int squadNo);
	public void setPlayer(int squadNo, Player player)
	public HashMap getPlayers();
	public void setPlayers(HashMap players);

public interface Player
	public void setName(String name); //PK
	public void getName();

My Player sqlmap is simple as, just doing a select * from players,
but my Team sqlmap is the one I'm having trouble with.
I wanted to be able to do something like 

	<resultMap id="teamResult" class="valueobject.newmodel.impl.TeamImpl">
		<result property="homeGround" column="home_ground"/>
		<result property="name" column="name"/>
		<result property="players" select="selectTeamPlayers" column="name">

where the selectTeamPlayers select creates a HashMap of Players keyed by squad number.

Is this possible using iBatis?
Any ideas how I could make it work?

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