Looping through Collection

Question

Hello I need to loop through the collection to process 500 records at a time from the resultset.
how do i do this?
I have created another variable of same type as resultset output variable type. but not sure how to assign nodes 1 to 1000 to the new variable.

Answer 1

Hi,
You can loop over your collection with a while loop. The following is from the bpel samples directory (112.Arrays) adapted to your needs. Define the variables:
<variable name="iterator" type="xsd:integer"/>
<variable name="count" type="xsd:integer"/>
<variable name="xpath" type="xsd:string"/>
Set the initial values:
<assign name="SetInitialValues">
<copy>
<from expression="1"/>
<to variable="iterator"/>
</copy>
<copy>
<from expression="ora:countNodes('input', 'payload','/tns:collection/tns:item')"/>
<to variable="count"/>
</copy>
</assign>
Make a while loop:
<while condition=" bpws:getVariableData('count') >= bpws:getVariableData('iterator')">
<sequence>
<assign name="setAttribute">
<copy>
<from expression="concat('/tns:collection/tns:item[',bpws:getVariableData('iterator'),']/tns:value')"/>
<to variable="xpath"/>
</copy>
<copy>
<from expression="bpws:getVariableData('input','payload',bpws:getVariableData('xpath'))/>
<to variable="output" part="payload" query="/tns:recordVariable/tns:value"/>
</copy>
<!--
Place here your own actions to be executed for every row
-->
<copy>
<from expression="bpws:getVariableData('iterator') + 1"/>
<to variable="iterator"/>
</copy>
</assign>
</sequence>
</while>
So the trick is to dynamically build an xpath expression based on the while loop counter.
Kind Regards,
Andre