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From "Gareth Moorst" <Gareth.Moo...@Phones4u.co.uk>
Subject 1:M problem
Date Wed, 12 Oct 2005 10:40:10 GMT
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I have two tables, one containing Receipts and the other containing receipt items.
I also have java objects Receipt and ReceiptLine where a Receipt contains a List of ReceiptLine
objects.

I have followed the instructions on the wiki to try to get around the N+1 selects problem,
but instead of returning a List of unique Receipts with a list of ReceiptLine objects, I get
a list of duplicate receipts, each with one ReceiptLine objects.
It seems as if the group by part of the solution isn't doing anything - I;ve tried running
the sql in a bare sql client, and the records seem to be ordered correctly, but iBatis isn;t
collating them?

My (simplified) sqlmap looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd"
>
<sqlMap namespace="VarianceSummaryReceipt">
	
	<typeAlias alias="Receipt" type="com.phones4u.datamanagement.datamodel.varianceSummary.impl.VarianceSummaryReceiptImpl"/>
	<typeAlias alias="ReceiptLine" type="com.phones4u.datamanagement.datamodel.varianceSummary.impl.VarianceSummaryReceiptLineImpl"/>
	
	<resultMap class="ReceiptLine" id="ReceiptLinesResult">
		<result property="consignmentNumber" column="consignment_no"/>
	</resultMap>
	
	<resultMap class="Receipt" id="ReceiptResult">
		<result property="deliveryId" column="delivery_id"/>
		<result property="lines" resultMap="VarianceSummaryReceipt.ReceiptLinesResult"/>
	</resultMap>
	
	<select id="getVarianceSummaryReceipt" parameterClass="map" resultMap="ReceiptResult">
	select distinct
		head.delivery_id,
		lines.consignment_no
	from variancesummaryreceipthead head, variancesummaryreceiptlines lines 
	where head.delivery_id=lines.delivery_id
	<dynamic prepend="and">
		<isParameterPresent>
			<isPropertyAvailable property="deliveryId">
			head.delivery_id=#deliveryId#
			</isPropertyAvailable>
		</isParameterPresent>
	</dynamic>
	group by 
		head.delivery_id,
		lines.consignment_no
	</select>
</sqlMap>


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