Question

ORCL_XMLELEMENT

Asked by: sam15

I get an error when i use XMLELEMENT with a large XML label (more than 30 characters).
Does XML have this limitation on labels? Is there a way around this using XMLELEMENT instead of using PL/SQL to generate the tags by code.

SELECT XMLELEMENT("EmployeeListthatneedsprocessing",
XMLAGG(XMLELEMENT("Name", e.job_id || ' ' || e.last_name))) AS "Result"
FROM employees e
WHERE employee_id > 200;

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Asked On
2009-11-02 at 04:05:03ID24863313
Tags

oracle

Topics

Oracle 10.x

,

Extensible Markup Language (XML)

,

Oracle Database

Participating Experts
3
Points
500
Comments
13

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Answers

 

by: shru_0409Posted on 2009-11-02 at 04:47:25ID: 25718851

 

by: shru_0409Posted on 2009-11-02 at 05:04:12ID: 25718923

 

by: slightwvPosted on 2009-11-02 at 05:47:55ID: 25719187

I agree with shru, it shouldn't be a problem.

The following works for me in 10.2.0.3:
-----------------------
select xmlelement("Thisissomereallyreallyreallyreallyabsurdlongelementname",sysdate) from dual;

Please provide the error message you are receiving and exact database version.

I also set up a quick test using your SQL on 10.2.0.3 and it works.


drop table emp_test;
create table emp_test ( employee_id number, job_id number, last_name varchar2(10)); 
insert into emp_test values(999,10,'Smith');
commit; 
SELECT XMLELEMENT("EmployeeListthatneedsprocessing",
XMLAGG(XMLELEMENT("Name", e.job_id || ' ' || e.last_name))) AS "Result"
FROM emp_test e
WHERE employee_id > 200;
                                              
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by: sdstuberPosted on 2009-11-02 at 06:23:42ID: 25719497

slightwv's example seems pretty clear cut.
I don't see how either of the links above answer the question though.  neither mention name lengths.  if they do, please indicate where, because I missed it.

sam15,
If you are having errors please show them and list exactly what version you are perhaps it's simply a matter of patching.

 

by: sdstuberPosted on 2009-11-02 at 06:29:35ID: 25719570

another option (not recommended) would be to extract the clob value of your xml and then do a simple replace

SELECT REPLACE(
           XMLELEMENT(
               "ShortName",
               XMLAGG(XMLELEMENT("Name", e.job_id || ' ' || e.last_name))
           ).getclobval(),
           'ShortName>',
           'Thisissomereallyreallyreallyreallyabsurdlongelementname>'
       )
           AS "Result"
FROM employees e
WHERE employee_id > 200;

                                              
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by: sam15Posted on 2009-11-02 at 08:20:51ID: 25720744

i am using 9iR2. is this a limitation of 9i R2.1.4.

select xmlelement("ffffffvvvvvvvvvvvvvvvvvvvvvvvvvvv",sysdate) from dual
                  *
ERROR at line 1:
ORA-00972: identifier is too long

why the replace would not be good. is it slow?






 

by: sdstuberPosted on 2009-11-02 at 08:25:50ID: 25720790

you selected the oracle 10 zone hence the version 10 answers above.

For 9i, get patched up to most recent version

I just confirmed this works on 9.2.0.8

select xmlelement("Thisissomereallyreallyreallyreallyabsurdlongelementname",sysdate) from dual

 

by: sdstuberPosted on 2009-11-02 at 08:30:08ID: 25720823

I just checked 9.2.0.8, 10.2.0.4, 11.2.0.1

all support up to 150 characters in the tag names

 

by: sam15Posted on 2009-11-02 at 08:52:02ID: 25721055

I cannot control the patch thing now. Lot of red ink.
actually it is 9.2.0.2. do you have that.

I will either trim those labels or do REPLACE like you suggest. You did not like that though.

 

by: sdstuberPosted on 2009-11-02 at 09:02:13ID: 25721155

I don't have a 9.2.0.2,  the remaining 9i's I work with are all 9.2.0.8

I don't recommend the REPLACE because it "should" be an unnecessary extra step.

If however, you can't get patched, the REPLACE should work.
Note, you might not be able to convert it back to XMLTYPE after doing so if you already have smaller limitations

 

by: slightwvPosted on 2009-11-02 at 09:08:52ID: 25721232

If you don't want to use replace.

This will probably hit the same 'bug' but there are a few ways around creating the same XML in Oracle.

See if this hits the bug:

SELECT XMLFOREST(
XMLAGG(XMLELEMENT("Name", e.job_id || ' ' || e.last_name)) as "EmployeeListthatneedsprocessing") AS "Result"
FROM emp_test e
WHERE employee_id > 200;

 

by: sam15Posted on 2009-11-02 at 16:18:43ID: 25725143

yes, it did give me same error message with he XMLFOREST statement.

 

by: slightwvPosted on 2009-11-02 at 16:39:25ID: 25725233

I remember early 9.2 being VERY buggy when it comes to XML.  I'll try to think of another possible work-around but I'm thinking you might be back to using replace as long as you don't have to go back to XMLTYPE in Oracle as sdstuber suggested.

FYI:  Things really didn't get stable with XML until 9.2.0.4.

We use XML a lot and for what it's worth:  I'm now on 11.1.0.7 and would NEVER think of going back.  XML gets better and MUCH faster with every release and patch.  Can't wait for 11.2.

20120131-EE-VQP-002

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