How can i initialize variables and append variable in bpelx:exec

Question

I want to know how to initialize variables in bpelx:exec.
I try to use java embedded activities for dynamic sql query. But I meet some problems that cannot assign the data to tempVariable. because I don't initialize tempVariable. but I can't initial variables in java embedded actitvities. How can i initialize variables in bpelx:exec ?
and I want to know to extend child Elment of tempVariables dynamically in bpelx:exec ?
here is my source.
<bpelx:exec name="callEmpDB" language="java" version="1.5">
<![CDATA[
String url = "jdbc:oracle:thin:@127.0.0.1:1521:wonchoi";
String user = "scott";
String passwd = "tiger";
int index = 1;
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
Node node = null;
try{                             
conn = DriverManager.getConnection (url, user, passwd);
stmt = conn.createStatement();
String wherescript = "";
Element empno = (Element)getVariableData("inputVariable","payload", "/client:selConnectDBProcessRequest/client:empno");
Element ename = (Element)getVariableData("inputVariable","payload", "/client:selConnectDBProcessRequest/client:ename");
Element job = (Element)getVariableData("inputVariable","payload", "/client:selConnectDBProcessRequest/client:job");
Element deptno = (Element)getVariableData("inputVariable","payload", "/client:selConnectDBProcessRequest/client:deptno");
String sql = "select empno, ename, job, mgr, hiredate, sal, comm, deptno from emp where 1 = 1 ";
if(empno != null && empno.getTextContent() != null && !empno.getTextContent().equals("") )
wherescript = wherescript + " and empno = " + empno.getTextContent() ;
if(ename != null && ename.getTextContent() != null && !ename.getTextContent().equals("") )
wherescript = wherescript + " and ename like '" + ename.getTextContent() +"' " ;
if(job != null && job.getTextContent() != null && !job.getTextContent().equals("") )
wherescript = wherescript + " and job = '" + job.getTextContent() +"' ";
if(deptno != null && deptno.getTextContent() != null && !deptno.getTextContent().equals("") )
wherescript = wherescript + " and deptno = " + deptno.getTextContent() ;
sql = sql + wherescript;
System.out.println("sql : "+sql);
rs = stmt.executeQuery(sql) ;
while (rs.next())
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:EMPNO", rs.getString("empno"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:ENAME", rs.getString("ename"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:JOB", rs.getString("job"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:MGR", (rs.getString("mgr")==null? "": rs.getString("mgr")));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:HIREDATE", rs.getString("hiredate"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:SAL", rs.getString("sal"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:COMM", rs.getString("comm"));
setVariableData("tempVariable", "payload", "/ns1:selEmpOutputCollection/child::*[position()="+index+"]/ns1:DEPTNO", rs.getString("deptno"));
index++;
}catch(SQLException sex){                          
System.out.println("sql error");
}catch(Exception ex){                             
System.out.println("error");
}finally{                             
try{                      
rs.close();
stmt.close();
conn.close();
}catch(Exception ex){}
}]]>
</bpelx:exec>
and here is tempVariable examples and schema.
<tempVariable>
     <part name="payload">
          <selEmpOutputCollection>
               <selEmpOutput>
               <EMPNO/>
               <ENAME/>
               <JOB/>
               <MGR/>
               <HIREDATE/>
               <SAL/>
               <COMM/>
               <DEPTNO/>
          </selEmpOutput>
          <selEmpOutputCollection>
     </part>
</tempVariable>     
<xsd:element name="selEmpOutputCollection" type="selEmpOutputCollection"/>
<xsd:element name="selEmpOutput" type="selEmpOutput"/>
<xsd:complexType name="selEmpOutputCollection">
<xsd:sequence>
<xsd:element name="selEmpOutput" type="selEmpOutput" minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="selEmpOutput">
<xsd:sequence>
<xsd:element name="EMPNO" type="xsd:decimal" nillable="true"/>
<xsd:element name="ENAME" type="xsd:string" nillable="true"/>
<xsd:element name="JOB" type="xsd:string" nillable="true"/>
<xsd:element name="MGR" type="xsd:decimal" nillable="true"/>
<xsd:element name="HIREDATE" type="xsd:dateTime" nillable="true"/>
<xsd:element name="SAL" type="xsd:decimal" nillable="true"/>
<xsd:element name="COMM" type="xsd:decimal" nillable="true"/>
<xsd:element name="DEPTNO" type="xsd:decimal" nillable="true"/>
</xsd:sequence>
</xsd:complexType>
thanks

Answer 1

My bpel project flow is as follows.
First, I initalize the temp varialbe like this.
<assign name="setInitialVar">
<copy>
<from>
<ns1:selEmpOutput xmlns:ns1="http://lgesoa.lge.com/EmpSpec/types">
<ns1:EMPNO/>
<ns1:ENAME/>
<ns1:JOB/>
<ns1:MGR/>
<ns1:HIREDATE/>
<ns1:SAL/>
<ns1:COMM/>
<ns1:DEPTNO/>
</ns1:selEmpOutput>
</from>
<to variable="tempVariable" part="payload"
query="/ns1:selEmpOutputCollection/ns1:selEmpOutput"/>
</copy>
</assign>
Second, get Data(ex. 10 Employee Information List) from DB for useing Java embedded activity.
Third, assing employee info to tempVariable, then BPEL assign just only one Employee Information. and next data can't assign and the BPEL make an error.
here is my error message..
<2007-03-02 11:23:26,125> <ERROR> <default.collaxa.cube.engine> <BPELXExecLet::setVariableData>
com.oracle.bpel.client.BPELFault: faultName: {{http://schemas.xmlsoap.org/ws/2003/03/business-process/}selectionFailure}
messageType: {null}
parts: {{summary=oracle.xml.parser.v2.XMLElement@15f80b}}
     at com.collaxa.cube.xml.dom.DOMUtil.copy(DOMUtil.java:536)
     at com.collaxa.cube.engine.ext.BPELXExecLet.setVariableData(BPELXExecLet.java:721)
     at com.collaxa.cube.engine.ext.BPELXExecLet.setVariableData(BPELXExecLet.java:700)
     at bpel.selconnectdb.ExecLetBxExe4.execute(ExecLetBxExe4.java:160)
     at com.collaxa.cube.engine.ext.wmp.BPELXExecWMP.__executeStatements(BPELXExecWMP.java:49)
     at com.collaxa.cube.engine.ext.wmp.BPELActivityWMP.perform(BPELActivityWMP.java:195)
     at com.collaxa.cube.engine.CubeEngine.performActivity(CubeEngine.java:3271)
     at com.collaxa.cube.engine.CubeEngine.handleWorkItem(CubeEngine.java:1697)
     at com.collaxa.cube.engine.dispatch.message.instance.PerformMessageHandler.handleLocal(PerformMessageHandler.java:75)
     at com.collaxa.cube.engine.dispatch.DispatchHelper.handleLocalMessage(DispatchHelper.java:184)
     at com.collaxa.cube.engine.dispatch.DispatchHelper.sendMemory(DispatchHelper.java:269)
     at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:5244)
     at com.collaxa.cube.engine.CubeEngine.createAndInvoke(CubeEngine.java:1083)
     at com.collaxa.cube.engine.ejb.impl.CubeEngineBean.createAndInvoke(CubeEngineBean.java:132)
     at com.collaxa.cube.engine.ejb.impl.CubeEngineBean.syncCreateAndInvoke(CubeEngineBean.java:161)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
I analyzed the problem. and I find the reason that is I just assing one XML flag to the temp variable. If i don't initalize the varaible like first step, BPEL make an error above error message.
thanks
Won.