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From "Chick, Brian" <Brian.Ch...@qg.com>
Subject GroupBy & Constructors
Date Tue, 15 May 2007 19:41:53 GMT
 I'm trying to use the groupBy attribute in conjunction with a
constructor.  When using the groupBy attribute with the default no-args
constructor, it works great.  Having issues using it when specifing a
constructor.  My resultmap that looks like this:

<resultMap id="ResultId" class="ResultClass" groupBy="TheUniqueId">
    <constructor>
        <argument argumentName="inUniqueId" column="ID"
dbType="Integer"/>        
        <argument argumentName="inValOne" column="VAL_ONE"
dbType="string"/>   
        <argument argumentName="inValTwo" column="VAL_TWO"
dbType="string"/>
    </constructor>
    <result property="TheUniqueId" column ="ID" dbType ="Integer"/>
    <result property ="ChildObject"
resultMapping="Domain.DataAccess.SqlMaps.ChildMapping"/>
</resultMap>

Throws the following NullReferenceException:

System.NullReferenceException was unhandled by user code
  Message="Object reference not set to an instance of an object."
  Source="IBatisNet.DataMapper"
  StackTrace:
       at
IBatisNet.DataMapper.MappedStatements.BaseStrategy.GetUniqueKey(IResultM
ap resultMap, RequestScope request, IDataReader reader)
       at
IBatisNet.DataMapper.MappedStatements.ResultStrategy.GroupByStrategy.Pro
cess(RequestScope request, IDataReader& reader, Object resultObject)
       at
IBatisNet.DataMapper.MappedStatements.ResultStrategy.MapStrategy.Process
(RequestScope request, IDataReader& reader, Object resultObject)
       at
IBatisNet.DataMapper.MappedStatements.MappedStatement.RunQueryForList[T]
(RequestScope request, ISqlMapSession session, Object parameterObject,
IList`1 resultObject, RowDelegate`1 rowDelegate)
       at
IBatisNet.DataMapper.MappedStatements.MappedStatement.ExecuteQueryForLis
t[T](ISqlMapSession session, Object parameterObject)
       at IBatisNet.DataMapper.SqlMapper.QueryForList[T](String
statementName, Object parameterObject)
       at
Quad.App.DataAccess.IBatis.BaseDataSource.<>c__DisplayClass59`1.<QueryFo
rList>b__58()
	 . . .

Any ideas would be appreciated.  Thanks.

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