Query XML(CLOB) datatype

Question

Hello,
I am new to XML and have been trying this for few days and get no luck ...
First, I have an Excel file, which contains a list of bills for customers. It is a sample file to test my application.
In the future, my application will receive data of XML-datatype, so my job here is to import this Excel file into my Oracle database 11gr2, then transform it to XML datatype one.
I did import it by using Oracle SQL Developer and nicely stored it in a table called so_lieu.
After that, I run the following code to convert the table data to XML datatype:
CREATE TABLE xmlDoc(temp CLOB);
DECLARE
  qryCtx DBMS_XMLGEN.ctxHandle;
  temp CLOB;
BEGIN
  qryCtx := DBMS_XMLGEN.newContext('SELECT * FROM huy.so_lieu');
  -- Set the row header to be bill
  DBMS_XMLGEN.setRowTag(qryCtx, 'bill');
  -- Get the result
  temp := DBMS_XMLGEN.getXML(qryCtx);
  INSERT INTO xmlDoc VALUES(temp);
  --Close context
  DBMS_XMLGEN.closeContext(qryCtx);
END;
It is a success:
table XMLDOC created.
anonymous block completed
When I run: SELECT * from xmlDoc; I can get a data of XML-datatype as following:
<?xml version="1.0"?>
<ROWSET>
<bill>
  <MA_CQTT>5335</MA_CQTT>
  <ACCOUNT>P482668</ACCOUNT>
  <TEN_CQTT>Công ty TNHH FrieslandCampina Việt Nam</TEN_CQTT>
  <DIACHI>phường Bình Hòa, Thị xã Thuận An, Bình Dương</DIACHI>
  <MS_THUE>3700229344-   -</MS_THUE>
  <SDT>754422 ext 333</SDT>
  <LOAI_DV>48</LOAI_DV>
  <TEN>Mail - SMD</TEN>
  <CUOC_DV>0</CUOC_DV>
  <DC>0</DC>
  <CUOC_TBSD>0</CUOC_TBSD>
  <TRUY_THU>0</TRUY_THU>
  <TONG_TIEN>22254545</TONG_TIEN>
  <VAT>2225455</VAT>
</bill>
<bill>
  <MA_CQTT>90255</MA_CQTT>
  <ACCOUNT>P0421100</ACCOUNT>
  <TEN_CQTT>VPĐD HOME MERIDIAN INTERNATIONAL,INC TạI TP.HCM</TEN_CQTT>
  <DIACHI>Tầng trệt, Block C, Cao ốc An Khang, P. An Phú, Q.2, TP.HCM</DIACHI>
  <MS_THUE>0302199864-   -</MS_THUE>
  <SDT>838228511</SDT>
  <FAX>838293764</FAX>
  <LOAI_DV>7</LOAI_DV>
  <TEN>Internet trực tiếp</TEN>
  <CUOC_DV>0</CUOC_DV>
  <DC>0</DC>
  <CUOC_TBSD>35446000</CUOC_TBSD>
  <TRUY_THU>0</TRUY_THU>
  <TONG_TIEN>35446000</TONG_TIEN>
  <VAT>3544600</VAT>
</bill>
</ROWSET>
Then I try to select/query the XML elements inside that XML data (to parse them into another tables) but cannot. I tried:
SELECT XMLQuery('
    for $x in ora:view("xmlDoc")/ROW
       return $x/TEMP/ROWSET/bill/MA_CQTT
' RETURNING CONTENT) FROM DUAL;
It gave errors
ORA-19276: XPST0005 - XPath step specifies an invalid element/attribute name: (ROWSET)
19276. 00000 -  "XP0005 - XPath step specifies an invalid element/attribute name: (%s)"
*Cause:    The XPath step specified invalid element or attribute name that did not match any nodes according to the input XML schema or structure.
*Action:   Correct the element or attribute name as the name may be mis-spelled.
I read several threads and think that maybe my ROWSET element is not XML anymore. Thus, cannot select using XPath. How can I fix it?
Thank you in advance,
Huy Do.
PS: I tried using XMLTABLE as below:
SELECT x2.*
  from XMLDOC h,
    XMLTABLE(
      '//ROWSET/bill'
      PASSING xmltype(h.temp)
      COLUMNS ma_cqtt  varchar(20) path 'ma_cqtt'
      ) x2
The query gave me a table of 2566 row of "ma_cqtt" but their value are all "null" (excel file has 2566 rows of record)
Message was edited by: 2716502

Answer 1

Thank you Odie I tried:
INSERT INTO DM_TABLE (ma_cqtt, account, thang_ps)
    select x.ma_cqtt
         , x.account
         , thangps as thang
Of course it returned an error, how silly of me to complicate thing like that
And I have one more question about the speed to parse a xml data. Please, help me with it.
In my code, I usually store xml data as a row in a temporary table (table mau_so_lieu). Then when doing parsing, I call the xml data from that table and the processing time is usually ~0.5s only. The code is like below:
INSERT INTO mau_so_lieu VALUES(xmlData);
INSERT INTO DM (                         
                            ma_kh, account, thang_ps)
    select x.ma_kh, x.account, thang
      from mau_so_lieu m, xmltable
          ('//Bao_cuoc'
            passing m.BILL
            columns
               ma_kh varchar2(20) path '@ma_cqtt'
              , account varchar2(20) path '@account'
          ) x;
But one of my senior (SQL server expert) suggested to store xml data in a variable (xmlData XMLType) as he thought the processing time will be even shorter, as well as no temporary table needed (no trash left which need to be cleaned later). I tried that but somehow the processing time is > 5s with the code as below:
INSERT INTO DM (                         
                            ma_kh, account, thang_ps)
    select x.ma_kh, x.account, thang
      from xmltable
          ('//Bao_cuoc'
            passing xmlData
            columns
               ma_kh varchar2(20) path '@ma_cqtt'
              , account varchar2(20) path '@account'
          ) x;
Could you tell me why the processing time are so different? Is it because of the default RAM of Oracle XE 11g is too small to process?
Thank you very much,
Huy Do.