upsert xmltype data xpath - missing something obvious?

Version: 10.2.0 * 2 * EA

I'm doing a upsert (update / insert) of an xmltype for a given xpath.

The xml data is passed as an xmltype, xpath is a string (varchar2), the new value is a string, varchar2.

If the node specified by the xpath expression exists it is trivial using updatexml; of course if the node is not nothing happens. I can verify the existence of nodes using is node, but I just take off, trying to figure out how to insert the node.

All the APIs I can find who to insert XML (APPENDCHILDXML, INSERTXMLBEFORE, INSERTCHILDXML) do not take an xpath but require an xmltype. Which means that if I'm reading this right I have no other choice to the parse varchar2 string xpath to create an xmltype (ugh!).

I can't find any API that takes an xpath as a varchar2 and a value and gives me an xmltype. Ideally I want same, here an API that returns the XML updated which took the set xpath to update (or inserted if it did not exist) with the new value.

I'm not an XML expert but I'm pretty handy with SQL and PL/SQL. For me this seems incredibly heavy just to do something as mundane as an upsert, so I hope I'm missing something obvious!

Can soemone please put me everything right with a pointer or an example?

On top of the XML uses namespaces, but they are not registered, there is no record of current schema.

Marco Gralike wrote:
Could not be done through XQuery, although the version of database doesn't really help...

It would be possible with a dynamic, but 'painful' XQuery with a static expression expression because it would require parsing the XPath expression and rebuild the entire document of entry with the necessary adaptations.
I think XSLT would be more effective in this case.

Perhaps, one day, when the database is XQuery Update Facility, we will be able to do:

copy $a := $doc/Address
modify (
  if ($a/zip)
    then replace value of node $a/zip with "12345"
    else insert node element zip {"12345"} into $a
)
return $a

user12083137 wrote: for me, from a SQL background, I can't believe this simple case is simply not covered.

Perhaps not as simple as it sounds. :)

The feature can be simulated by an IF/THEN/ELSE logic, or a DELETE/INSERT sequence.
For example:

case when existsNode(doc, xpath) = 1
  then updateXML(
         doc
       , xpath || '/text()'
       , somevalue
       )
  else appendchildxml(
         doc
       , substr(xpath, 1, instr(xpath, '/', -1)-1)
       , xmlelement(
           evalname(substr(xpath, instr(xpath, '/', -1)+1))
         , somevalue
         )
       )
end

or,

appendChildXML(
  deleteXML(doc, xpath)
, substr(xpath, 1, instr(xpath, '/', -1)-1)
, xmlelement(
    evalname(substr(xpath, instr(xpath, '/', -1)+1))
  , somevalue
  )
)

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    Yes, when I run the code above I get the same problem.  It seems that the two finger gestures and pinching are fly events and not 'fault', so that it goes to the tap gesture.  If I rearrange the gesture_allocs to this

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    https://developer.BlackBerry.com/native/reference/BB10/com.QNX.doc.gestures.lib_ref/topic/about_even...

    In addition, time of the event is the time of the real event, not when you have received the event with bps_get_event.  Any delay should not affect the treatment of the gesture.

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    LABORD_CODE_ID,

    COMPENDIUM_ID,

    ORDER_CODE,

    ORDER_DESC,

    ACTIVE,

    TIMESTAMP,

    MODIFIED_BY)

    SELECT MLOCDS_SEQ. NEXTVAL,

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/COMPENDIUM_ID') AS COMPENDIUM_ID,

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/ORDER_CODE') AS ORDER_CODE,

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/ORDER_DESC') AS ORDER_DESC,.

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/LOINC_CODE') AS LOINC_CODE,

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/ACTIVE') AS ACTIVE.

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/TIMESTAMP') AS TIMESTAMP.

    EXTRACTVALUE (VALUE (MLOC), '/ ORDERCODE/MODIFIED_BY') AS MODIFIED_BY

    TABLE (XMLSEQUENCE (EXTRACT(X,'/ORDERCODES/ORDERCODE'))) NMCO;

    OUT_AFFECTEDROWS: = NUMBER OF ROWS SQL %;

    EXCEPTION

    WHILE OTHERS THEN

    dbms_output.put_line (SQLERRM);

    RAISE_APPLICATION_ERROR (-20001, SQLERRM);

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    declare

  in_ordercodesxml  clob :=
  '
  
    500
    696231
    ABO Group & Rh Type
    NULL
    12345
    Y
    2014-08-13
    1
  
';

begin

  merge into maint_labord_codes t
  using (
    select compendium_id
         , order_code
         , order_desc
         , loinc_code
         , active
         , timestamp
         , modified_by
    from xmltable('/ORDERCODES/ORDERCODE'
           passing xmltype(in_ordercodesxml)
           columns COMPENDIUM_ID    number(10)    path 'COMPENDIUM_ID'
                 , ORDER_CODE       varchar2(50)  path 'ORDER_CODE'
                 , ORDER_DESC       varchar2(250) path 'ORDER_DESC'
                 , LOINC_CODE       varchar2(10)  path 'LOINC_CODE'
                 , ACTIVE           varchar2(1)   path 'ACTIVE'
                 , TIMESTAMP        date          path 'TIMESTAMP'
                 , MODIFIED_BY      number(10)    path 'MODIFIED_BY'
         )
  ) x
  on (     t.compendium_id = x.compendium_id
       and t.order_code = x.order_code )
  when matched then update
    set t.order_desc = x.order_desc
      , t.loinc_code = x.loinc_code
      , t.active     = x.active
      , t.timestamp  = x.timestamp
      , t.modified_by = x.modified_by
  when not matched then insert
  (
    labord_code_id
  , compendium_id
  , order_code
  , order_desc
  , loinc_code
  , active
  , timestamp
  , modified_by
  )
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    mlocds_seq.nextval
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  , x.order_code
  , x.order_desc
  , x.loinc_code
  , x.active
  , x.timestamp
  , x.modified_by
  );

end;
/

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