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From "Bob Hanson" <mnbo...@gmail.com>
Subject Re: GroupBy & Constructors
Date Tue, 15 May 2007 19:55:16 GMT
Unfortunately GroupBy result maps do not currently support the
constructor element.

On 5/15/07, Chick, Brian <Brian.Chick@qg.com> wrote:
>  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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