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From "Zarar Siddiqi" <zarar.sidd...@utoronto.ca>
Subject Re: Nested Lists [signed]
Date Thu, 17 Nov 2005 21:50:35 GMT
When you're calling "getGamesForChannel", you're specifying the 
parameterClass as a String whlie you're passing it a channelID which I am 
assuming is an Integer.

Also, regarding this syntax:

<result property="leagueFlags" column="{channelID=channelID,gameID=gameID}" 
select="getLeaguesForGame" />

I'm not too sure you can do what you're doing in the column attribute. 
Maybe an IBatis team member can jump in and show us how to pass in multiple 
values into a select query from a result map.

You also might want to have a look at the "Avoiding N+1 Selects" part in the 
documentation but that's after you get this working.

Zarar


----- Original Message ----- 
From: "Michael Laccetti" <michael@s2g-limited.com>
To: <user-java@ibatis.apache.org>
Sent: Thursday, November 17, 2005 4:37 PM
Subject: RE: Nested Lists [signed]


> So nobody has any ideas?
>
> Mike
>
> -----Original Message-----
> From: Michael Laccetti [mailto:michael@s2g-limited.com]
> Sent: November 16, 2005 10:56 PM
> To: user-java@ibatis.apache.org
> Subject: Nested Lists [signed]
>
> I've got a bit of a tricky question.  I'm trying to retrieve a list of
> objects from the database.  That's the easy part.  The hard part is that 
> two
> properties in the object are also lists.  So, when I call the list query, 
> it
> in turn will call two sub-queries to populate the properties.  I've read
> about doing it, and thought that I knew what to do, but I cannot make it
> work.  The other problem is that no actual exceptions get thrown.  If I
> wasn't debugging the app I would have never even noticed it (aside from a
> lack of objects in the lists).
>
> Here are links to two screenshots that will show you the exceptions:
> (Note: they're somewhat large, I apologize in advance.)
>
> http://images.nihilist.ca/gallery/main.php?g2_view=core.ShowItem&g2_itemId=6
> 6&g2_imageViewsIndex=2&g2_navId=xb4c396b6
> http://images.nihilist.ca/gallery/main.php?g2_view=core.ShowItem&g2_itemId=7
> 0&g2_imageViewsIndex=2&g2_navId=xb4c396b6
>
>
> Here is the actual configuration for everything.  The query starts at the
> bottom, the statement with id getChannelInformation.  That then calls
> getLeaguesForGame and getLocationsForGame.  It is also attempting to pass 
> in
> two properties, though I do not know if I've got it right, or got it at 
> all.
> I'm trying to pass in the channel ID, but that's from the first query, and 
> I
> do not know if it propagates properly.
>
> <resultMap id="get-locations-for-game" class="java.lang.String">
>      <result property="value" column="flag_location" />
>   </resultMap>
>
>   <statement id="getLocationsForGame" resultMap="get-locations-for-game">
>      SELECT
>         flag_location
>      FROM
>         scrimbot_location
>      WHERE
>         id IN (
>         SELECT
>            scrimbot_channel_games.scrim_location_id
>         FROM
>            scrimbot_channels
>         INNER JOIN
>            scrimbot_channel_games ON
> (scrimbot_channels.id=scrimbot_channel_games.channel_id)
>         WHERE
>            scrimbot_channels.channel = '#channelID#'
>         AND
>            scrimbot_channel_games.game_id=#gameID#
>      )
>   </statement>
>
>   <resultMap id="get-leagues-for-game" class="java.lang.String">
>      <result property="value" column="league" />
>   </resultMap>
>
>   <statement id="getLeaguesForGame" resultMap="get-leagues-for-game">
>      SELECT
>         scrimbot_leagues.league
>      FROM
>         scrimbot_leagues
>      WHERE
>         id IN (
>         SELECT
>            scrimbot_channel_games.league_id
>         FROM
>            scrimbot_channels
>         INNER JOIN
>            scrimbot_channel_games ON (scrimbot_channels.id =
> scrimbot_channel_games.channel_id)
>         WHERE
>            scrimbot_channels.channel = '#channelID#'
>         AND
>            scrimbot_channel_games.game_id=#gameID#
>      )
>   </statement>
>
>   <resultMap id="get-games-for-channel" class="game">
>      <result property="gameID" column="gameID" />
>      <result property="gameFlag" column="game"/>
>      <result property="gametypeID" column="gametypeID"/>
>      <result property="gametypeFlag" column="gametype"/>
>      <result property="leagueFlags"
> column="{channelID=channelID,gameID=gameID}" select="getLeaguesForGame" />
>      <result property="locationFlags"
> column="{channelID=channelID,gameID=gameID}" select="getLocationsForGame" 
> />
>   </resultMap>
>
>   <statement id="getGamesForChannel" resultMap="get-games-for-channel"
> parameterClass="java.lang.String">
>      SELECT
>         scrimbot_games.id as gameID,
>         scrimbot_games.game,
>         scrimbot_gametypes.id as gametypeID,
>         scrimbot_gametypes.gametype,
>         scrimbot_channels.id as channelID
>      FROM
>         scrimbot_channels
>      INNER JOIN
>         scrimbot_channel_games ON
> (scrimbot_channels.id=scrimbot_channel_games.channel_id)
>      INNER JOIN
>         scrimbot_games ON
> (scrimbot_channel_games.game_id=scrimbot_games.id)
>      INNER JOIN
>         scrimbot_gametypes ON
> (scrimbot_channel_games.gametype_id=scrimbot_gametypes.id)
>      WHERE
>         scrimbot_channels.channel = #value#
>   </statement>
>
>   <resultMap id="get-channel-info" class="channel">
>      <result property="channelID" column="id"/>
>      <result property="channel" column="channel"/>
>      <result property="channelLocation" column="location"/>
>      <result property="owner" column="username" />
>      <result property="ownerEmail" column="emailaddress" />
>      <result property="dateAdded" column="date_added" />
>      <result property="games" column="channelID"
> select="getGamesForChannel"/>
>   </resultMap>
>
>   <statement id="getChannelInformation" resultMap="get-channel-info">
>      SELECT
>         scrimbot_channels.id,
>         scrimbot_channels.channel,
>         scrimbot_channels.date_added,
>         gg_users.username,
>         gg_users.emailaddress,
>         scrimbot_location.flag_location as location,
>      FROM
>         scrimbot_channels
>      INNER JOIN
>         scrimbot_location ON
> (scrimbot_channels.location=scrimbot_location.id)
>      INNER JOIN
>         gg_users ON (scrimbot_channels.owner=gg_users.userID)
>      WHERE
>         scrimbot_channels.channel='#value#'
>   </statement>
>
> So, if anybody can shed some light on what I'm doing wrong, or not doing 
> at
> all, I'd appreciate it.
>
> Mike
>
>
>
>
>
>
> 



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