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| Re: Preprocessing table group data [message #660517 is a reply to message #660497] |
Fri, 18 March 2011 18:57  |
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Michal,
Could you not add a group aggregation to the binding then use the table
filter to filter on it. Take a look at this example. It only shows the
first two rows of every order (grouped by order number);
Jason
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<property name="position">3</property>
<property name="name">QUANTITYORDERED</property>
<property name="nativeName">QUANTITYORDERED</property>
<property name="dataType">integer</property>
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<property name="position">4</property>
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<property name="nativeDataType">8</property>
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<property name="position">5</property>
<property name="name">ORDERLINENUMBER</property>
<property name="nativeName">ORDERLINENUMBER</property>
<property name="dataType">integer</property>
<property name="nativeDataType">5</property>
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<xml-property name="queryText"><![CDATA[select *
from orderdetails
where ordernumber < 10106]]></xml-property>
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<design:displayName>ORDERLINENUMBER</design:displayName>
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</label>
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<label id="20">
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</label>
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<expression name="keyExpr"
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<cell id="59">
<data id="63">
<property name="resultSetColumn">Column
Binding</property>
</data>
</cell>
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<data id="23">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">ORDERNUMBER</property>
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<data id="25">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">PRODUCTCODE</property>
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<cell id="26">
<data id="27">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">QUANTITYORDERED</property>
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<data id="29">
<property name="whiteSpace">nowrap</property>
<property
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<cell id="30">
<data id="31">
<property name="whiteSpace">nowrap</property>
<property
name="resultSetColumn">ORDERLINENUMBER</property>
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<cell id="33"/>
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</table>
</body>
</report>
n 3/18/2011 12:14 PM, Michał Tkacz wrote:
> Hi,
>
> I have a table with several groups defined. Now for each group I need to
> preprocess the data for that group by removing some of the rows from
> that group. In particular the aggregations defined for these groups
> should not take these rows into account. The thing is that whether the
> row should be removed or not, does not depend only on the row itself,
> but rather on its relation to other rows in the group. Thus I can't see
> how I could use normal filtering here. Instead what I'm looking for is
> how to preprocess the set of rows for each group being created. Which
> element should I attach the script to? What event should I handle? How
> can I access the rows for the group?
>
> It would be nice if I could preprocess each group independently. i.e.
> removing some rows for the higer-level group should only impact
> aggregations for that group and should not remove rows from the
> lower-level groups it contains (unless I decide to remove them at that
> level). But I don't know yet if I will need it.
>
> To give you an idea of how I need to preprocess the data: each row is of
> some kind (which has nothing to do with the groups defined in table).
> Now if there're more than 50% of rows of a particular kind in a group, I
> should randomly remove rows of that kind so that there are no more than
> 50% of them in a group.
>
> Any hints would be appreciated,
>
> Michal
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