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| bab |
 Posted: Thu Aug 04, 2016 3:28 am Post subject: How to return mbElement[] from Java to ESQL? |
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Novice
Joined: 05 Jul 2016
Posts: 17
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Hi I am new to IIB.
I want to pass REFERENCE as a argument to Java method and transform it then i want to return in the form of mbElement[].
Is there any way to do?
Kindly reply. |
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| mqjeff |
| Posted: Thu Aug 04, 2016 3:46 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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The documentation should be clear on what things can be passed into and out of a Java method.
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| bab |
| Posted: Thu Aug 04, 2016 3:59 am Post subject: |
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Joined: 05 Jul 2016
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| mqjeff |
| Posted: Thu Aug 04, 2016 4:30 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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That says that if you put a REFERENCE as a parameter in your Java method, and in the DEFINE PROCEDURE statement, then your java code will get either an MbElement object (singular) or an array of MbElements - depending on if it's an IN or INOUT parameter.
Then you just pass the reference value in your CALL statement.
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| bab |
| Posted: Thu Aug 04, 2016 5:03 am Post subject: |
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Novice
Joined: 05 Jul 2016
Posts: 17
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| I can able to pass REFERENCE type but i am unable to return mbElement[] type. |
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| bab |
| Posted: Mon Aug 08, 2016 2:32 am Post subject: Error: SqlRoutine::clearDownChildEnv |
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Novice
Joined: 05 Jul 2016
Posts: 17
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I am using the following code in ESQL
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CALL retrieveData(CAST(AGE AS INTEGER),OutputRoot.XMLNSC.employees) into RESULT;
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Calling java method as follows :
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create function retrieveData(IN empId INTEGER,INOUT outputXML REFERENCE)
returns integer
language java
external name "com.test.util.Database.retrieve"; |
Below is the java method:
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public static Long retrieve(Long employeeAge,MbElement[] outputRoot)
{
MbElement xmlnsc = outputRoot[0].getFirstElementByPath("XMLNSC");
MbElement employees = xmlnsc.createElementAsFirstChild(MbElement.TYPE_NAME, "employees", null);
MbElement employee =employees.createElementAsLastChild(MbElement.TYPE_NAME, "employee", "");
employee.createElementAsLastChild(MbElement.TYPE_NAME, "emp-id", 1001);
employee.createElementAsLastChild(MbElement.TYPE_NAME, "emp-name", "john");
employee.createElementAsLastChild(MbElement.TYPE_NAME, "emp-age", 30);
employee.createElementAsLastChild(MbElement.TYPE_NAME, "emp-city", "london");
return new Long(0);
} |
It is throwing SqlRoutine::clearDownChildEnv error. |
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| mqjeff |
| Posted: Mon Aug 08, 2016 3:59 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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You're passing in a reference to OutputRoot.XMLNSC.employees...
Unless you're doing something very odd, this won't have a child element named XMLNSC. It will only have children that belong to the employees structure.
So
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| MbElement xmlnsc = outputRoot[0].getFirstElementByPath("XMLNSC"); |
Won't return anything, yes?
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| bab |
| Posted: Mon Aug 08, 2016 8:38 pm Post subject: |
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Novice
Joined: 05 Jul 2016
Posts: 17
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| It is returning MbElement properly and I can able to add child element under OutputRoot->XMLNSC->employees and I can able to access the children of employees element in the Expressions tab while in debug mode. |
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| mqjeff |
| Posted: Tue Aug 09, 2016 3:49 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Your ESQL Code
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| CALL retrieveData(CAST(AGE AS INTEGER),OutputRoot.XMLNSC.employees) into RESULT; |
The reference you are passing in is to the employees structure, not to OutputRoot.
Your java code is trying to find the XMLNSC MbElement beneath the employees structure. It's not, or shouldn't be, there.
Run a usertrace. Use a tracenode with pattern ${Root.XMLNSC.employees} and ${Root} before the ComputeNode. Compare the two trees.
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| bab |
| Posted: Tue Aug 09, 2016 6:29 am Post subject: |
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Novice
Joined: 05 Jul 2016
Posts: 17
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Thanks for your reply.
I got output.
I have used in the following way:
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SET OutputRoot.XMLNSC.employees=null;
DECLARE outputref REFERENCE TO OutputRoot.XMLNSC.employees;
CALL retrieveData(CAST(AGE AS INTEGER),outputref) into RESULT; |
Its working fine.
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| smdavies99 |
| Posted: Tue Aug 09, 2016 9:30 am Post subject: |
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Jedi Council
Joined: 10 Feb 2003
Posts: 6076
Location: Somewhere over the Rainbow this side of Never-never land.
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May I humbly suggest that you take a usertrace of your flow and look at what happens when you execute
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SET OutputRoot.XMLNSC.employees=null;
DECLARE outputref REFERENCE TO OutputRoot.XMLNSC.employees
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You may well want to think again especially with regard to the first line of ESQL.
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Every time you reinvent the wheel the more square it gets (anon). If in doubt think and investigate before you ask silly questions. |
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| mqjeff |
| Posted: Tue Aug 09, 2016 10:01 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Also.
Were my remarks so obscure that changing your code from
| Code: |
| CALL retrieveData(CAST(AGE AS INTEGER),OutputRoot.XMLNSC.employees) into RESULT; |
to
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| CALL retrieveData(CAST(AGE AS INTEGER),OutputRoot) into RESULT; |
didn't seem like a thing to try?
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| ghoshly |
| Posted: Tue Aug 09, 2016 2:05 pm Post subject: Name / Value |
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Partisan
Joined: 10 Jan 2008
Posts: 333
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bab - Please try as suggested by mqjeff.
I would also like to point another may be silly mistake -
You are using MbElement.TYPE_NAME even when you are populating name and value. I believe we have different argument as MbElement.TYPE_NAME_VALUE.
Please rectify me if I am wrong. |
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| bab |
| Posted: Tue Aug 09, 2016 9:20 pm Post subject: |
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Novice
Joined: 05 Jul 2016
Posts: 17
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Thanks for your suggestions.
@mqjeff - I tried whatever you specified in the following statement
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| CALL retrieveData(CAST(AGE AS INTEGER),OutputRoot) into RESULT; |
But i didn't return even XMLNSC element also.
@ghoshly - Yes ghoshly you are correct. I have to use MbElement.TYPE_NAME_VALUE. Thanks for your correction.
May i know what is the difference between MbElement.TYPE_NAME and MbElement.TYPE_NAME_VALUE? . Because both producing the same output. |
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| mqjeff |
| Posted: Wed Aug 10, 2016 3:57 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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If it's not returning XMLNSC, then have you done anything with the OutputRoot at all? Like create an XMLNSC tree?
If your ESQL code does
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| SET OutputRoot.XMLNSC.employees=null; |
then this is *creating* the XMLNSC parser element, as well as the employees element, and setting the value of the employees element to Null.
If you pass in a reference to a field that doesn't exist, or otherwise create a reference in ESQL to a field that doesn't exist, the reference points to the first parent that does exist.
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