XPATH Database Query Syntax in an Assign

Question

Trying to get an XPATH Database query to work by assigning the Input variable value in a simple BPEL Process to my query condition. I keep getting invalid XPATH errors. I cannot seem to figure out how get write it out.
Here is what I have:
<from expression="orcl:query-database( 'select ename from emp where ename = bpws:getVariableData('inputVariable','payload','/client:ReadDBProcessRequest/client:input')' ,false(),false(),'jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL')"/>
Here is my error:
Error(30): [Error ORABPEL-10039]: invalid xpath expression [Description]: in line 30 of "C:\OraBPELPM_1\integration\jdev\jdev\mywork\BPELws\ReadDB\ReadDB.bpel", xpath expression "orcl:query-database( 'select ename from emp where ename = bpws:getVariableData('inputVariable','payload','/client:ReadDBProcessRequest/client:input')' ,false(),false(),'jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL')" specified in <from> is not valid, because XPath query syntax error. Syntax error while parsing xpath expression "orcl:query-database( 'select ename from emp where ename = bpws:getVariableData('inputVariable','payload','/client:ReadDBProcessRequest/client:input')' ,false(),false(),'jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL')", at position "80" the exception is Expected: ). Please verify the xpath query "orcl:query-database( 'select ename from emp where ename = bpws:getVariableData('inputVariable','payload','/client:ReadDBProcessRequest/client:input')' ,false(),false(),'jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL')" which is defined in BPEL process. . [Potential fix]: Please make sure the expression is valid.
Any help?
Thanks!!!

Answer 1

Ok. I have figured out how to place the condition (variable value) inside a concatentated string. So my final result is the actual XPATH Query-Database statement. But the problem is it is being returned as a String. How can I turn that final string into the XPATH expression I need? I suspect another <COPY> block could pull this off but I am not sure how to do it.
Here is my code:
<process name="QueryBuild" targetNamespace="http://xmlns.oracle.com/QueryBuild" xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/" xmlns:bpws="http://schemas.xmlsoap.org/ws/2003/03/business-process/" xmlns:xp20="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.Xpath20" xmlns:ns1="http://www.w3.org/2001/XMLSchema" xmlns:ldap="http://schemas.oracle.com/xpath/extension/ldap" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:bpelx="http://schemas.oracle.com/bpel/extension" xmlns:client="http://xmlns.oracle.com/QueryBuild" xmlns:ora="http://schemas.oracle.com/xpath/extension" xmlns:orcl="http://www.oracle.com/XSL/Transform/java/oracle.tip.pc.services.functions.ExtFunc">
<partnerLinks>
<partnerLink name="client" partnerLinkType="client:QueryBuild" myRole="QueryBuildProvider"/>
</partnerLinks>
<variables>
<variable name="inputVariable" messageType="client:QueryBuildRequestMessage"/>
<variable name="outputVariable" messageType="client:QueryBuildResponseMessage"/>
<variable name="QueryText" type="ns1:string"/>
</variables>
<sequence name="main">
<receive name="receiveInput" partnerLink="client" portType="client:QueryBuild" operation="process" variable="inputVariable" createInstance="yes"/><!-- Generate reply to synchronous request -->
<assign name="Assign_1">
<copy>
<from expression="concat(&quot;orcl:query-database('select ename from emp where empno = &quot;, bpws:getVariableData('inputVariable','payload','/client:QueryBuildProcessRequest/client:input'), &quot;,false(),false(),'jdbc:oracle:thin:scott/tiger@localhost:1521:ORCL)'&quot;)"/>
<to variable="QueryText"/>
</copy>
<copy>
<from variable="QueryText"/>
<to variable="outputVariable" part="payload" query="/client:QueryBuildProcessResponse/client:result"/>
</copy>
</assign>
<reply name="replyOutput" partnerLink="client" portType="client:QueryBuild" operation="process" variable="outputVariable"/>
</sequence>
</process>