Retrieving data from different node in SQL

Question

Hi friends,
First of all:
        BANNER
1     Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
2     PL/SQL Release 11.2.0.3.0 - Production
3     CORE     11.2.0.3.0     Production
4     TNS for Linux: Version 11.2.0.3.0 - Production
5     NLSRTL Version 11.2.0.3.0 - ProductionI have a small but annoying problem. I have to build a bank application which must take data from an input file, and, based on those information, to execute some stored procedures (create a new customer, create a new account, create a transaction for an account).
For example: the input file contain few new customers (FirstName, LastName, SocialSecurityNumber, BirthDay, Address and PhoneNo), for each customer at least 1 account to be created, for each account 1 or more transactions (the amount of transaction).
Let me be more specific. This is an XML as a input file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<doc>
  <PERS_INFO>
    <lastname>John</lastname>
    <firstname>Doe</firstname>
    <social_security_no>1800325171545</social_security_no>
    <birthday>25/03/1980</birthday>
    <address>Principal, 15</address>
    <phoneno>0040722222222</phoneno>
    <acc>
      <transaction>200</transaction>
      <transaction>150</transaction>
      <transaction>-23</transaction>
    </acc>
    <acc>
      <transaction>450</transaction>
    </acc>
    <acc>
      <transaction>800</transaction>
      <transaction>320</transaction>
      <transaction>-125</transaction>
    </acc>
  </PERS_INFO>
  <PERS_INFO>
    <lastname>Smith</lastname>
    <firstname>Pop</firstname>
    <social_security_no>2851211173377</social_security_no>
    <birthday>11/12/1985</birthday>
    <address>FirstAvenue, 20</address>
    <phoneno>0040744444444</phoneno>
    <acc>
      <transaction>444</transaction>
      <transaction>550</transaction>
    </acc>
    <acc>
      <transaction>113</transaction>
      <transaction>-50</transaction>
      <transaction>89</transaction>
    </acc>
    <acc>
      <transaction>300</transaction>
    </acc>
  </PERS_INFO>
</doc>This input file should start the following:
- create 2 new customers (using a stored procedure Pr_Add_New_Cust):
1. John Doe / 1800325171545 / 25.03.1980 / Principal, 15 / 0040722222222
2. Smith Pop / 2851211173377 / 11.12.1985 / FirstAvenue, 20 / 0040744444444
- for John Doe I have to create 3 new account (using a stored procedure Pr_Add_New_Account):
- account 1 - for this account I have to create 3 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 200$, DEPOSIT 150$, WITHDRAW 23$
- account 2 - for this account I have to create 1 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 450$
- account 3 - for this account I have to create 3 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 800$, DEPOSIT 320$, WITHDRAW 125$
- for Smith Pop I have to create 3 new account (using a stored procedure Pr_Add_New_Account):
- account 1 - for this account I have to create 2 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 444$, DEPOSIT 550$
- account 2 - for this account I have to create 3 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 113$, WITHDRAW 50$, DEPOSIT 89$
- account 3 - for this account I have to create 1 new transactions (using a stored procedure Pr_Create_New_Trans): DEPOSIT 300$
Well, I'm thinking to do that by loading that XML into a pre-staging table - INS_STG1 - (the loading part is not an issue for the moment) and by parsing the XML in order to get my necessary information (inserting into the second staging table INS_STG2) to launch those procedures.
Something like this (for the moment I insert only the customer information since I don't know how to get to the second level):
DECLARE 
   TYPE ty_rec_1    IS RECORD (v_cust_firstname       VARCHAR2(32),
                               v_cust_lastname        VARCHAR2(32),
                               v_cust_persnumcode     VARCHAR2(32),
                               v_cust_birthday        VARCHAR2(32),
                               v_cust_address         VARCHAR2(32),
                               v_cust_phoneno         VARCHAR2(32));
   TYPE ty_cur_1       IS REF CURSOR RETURN ty_rec_1;
   TYPE ty_arr_rec_1   IS TABLE OF ty_rec_1 INDEX BY PLS_INTEGER;
   cur_1               ty_cur_1;
   arr_rec_1           ty_arr_rec_1;
   my_xml              xmltype;
   N_BULK_SIZE         NUMBER := 1000;
BEGIN
  SELECT xml_column INTO my_xml FROM INS_STG1;
  OPEN cur_1 FOR
    SELECT extractvalue(column_value, '/PERS_INFO/firstname')          "v_cust_firstname",
           extractvalue(column_value, '/PERS_INFO/lastname')           "v_cust_lastname",
           extractvalue(column_value, '/PERS_INFO/social_security_no') "v_cust_persnumcode",
           extractvalue(column_value, '/PERS_INFO/birthday')           "v_cust_birthday",
           extractvalue(column_value, '/PERS_INFO/address')            "v_cust_address",
           extractvalue(column_value, '/PERS_INFO/phoneno')            "v_cust_phoneno"      
    FROM TABLE(XMLSequence(my_xml.extract('/doc/PERS_INFO'))) t;
    LOOP
       FETCH cur_1 BULK COLLECT INTO arr_rec_1 LIMIT N_BULK_SIZE;
       EXIT WHEN arr_rec_1.COUNT() = 0;
       FORALL n_idx1 IN 1..arr_rec_1.COUNT()
         INSERT INTO INS_STG2
           (cust_firstname, cust_lastname, cust_persnumcode, cust_birthday, cust_address, cust_phoneno)
          VALUES
          (arr_rec_1(n_idx1).v_cust_firstname, arr_rec_1(n_idx1).v_cust_lastname,
           arr_rec_1(n_idx1).v_cust_persnumcode, arr_rec_1(n_idx1).v_cust_birthday,
           arr_rec_1(n_idx1).v_cust_address, arr_rec_1(n_idx1).v_cust_phoneno);
     END LOOP;
   CLOSE cur_1; 
  COMMIT;             
END;That procedure is based on the SQL query that I start to ply with in order to understand how to get the information from XML using SQL (the XML is hard-coded)
SELECT extractvalue(column_value, '/PERS_INFO/firstname')    "First Name",
       extractvalue(column_value, '/PERS_INFO/lastname')     "Last Name",
       extractvalue(column_value, '/PERS_INFO/social_security_no')  "Social Security No",
       extractvalue(column_value, '/PERS_INFO/birthday')     "Birth-day",
       extractvalue(column_value, '/PERS_INFO/address')      "Address",
       extractvalue(column_value, '/PERS_INFO/phoneno')      "Phone No"
  FROM TABLE(XMLSequence(
             XMLTYPE(
             '<?xml version="1.0" encoding="ISO-8859-1"?>
              <doc>
                <PERS_INFO>
                  <lastname>John</lastname>
                  <firstname>Doe</firstname>
                  <social_security_no>1800325171545</social_security_no>
                  <birthday>25/03/1980</birthday>
                  <address>Principal, 15</address>
                  <phoneno>0040722222222</phoneno>
                  <acc>
                    <transaction>200</transaction>
                    <transaction>150</transaction>
                    <transaction>-23</transaction>
                  </acc>
                  <acc>
                    <transaction>450</transaction>
                  </acc>
                  <acc>
                    <transaction>800</transaction>
                    <transaction>320</transaction>
                    <transaction>-125</transaction>
                  </acc>
                </PERS_INFO>
                <PERS_INFO>
                  <lastname>Smith</lastname>
                  <firstname>Pop</firstname>
                  <social_security_no>2851211173377</social_security_no>
                  <birthday>11/12/1985</birthday>
                  <address>FirstAvenue, 20</address>
                  <phoneno>0040744444444</phoneno>
                  <acc>
                    <transaction>444</transaction>
                    <transaction>550</transaction>
                  </acc>
                  <acc>
                    <transaction>113</transaction>
                    <transaction>-50</transaction>
                    <transaction>89</transaction>
                  </acc>
                  <acc>
                    <transaction>300</transaction>
                  </acc>
                </PERS_INFO>
              </doc>').extract('/doc/PERS_INFO'))) t;My problem is that query goes only at the first level (the customer level). I don't know how to get to the second/third level (account/transactions level).
Now, that query return:
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444and I want it to return like this:
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1   200
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1   150
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1  -23
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  2   450
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3   800
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3   320
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3  -125
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  1   444
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  1   550
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2   113
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2  -50
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2   89
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  3   300What I have to do to that SQL query to get the result at the transaction level (as in the second table)? That XML can be subject of improvement as well. If another structure serve better for my purpose, please let me know.
Thanks!

Answer 1

As [url http://docs.oracle.com/cd/E11882_01/server.112/e26088/functions061.htm#SQLRF06173]extractvalue is deprecated in your version, you need to switch to another method as the documentation suggests.
Going forward with that, here is a starter SQL that gives you the desired output
WITH INS_STG1 AS
(SELECT XMLTYPE('<?xml version="1.0" encoding="ISO-8859-1"?>
              <doc>
                <PERS_INFO>
                  <lastname>John</lastname>
                  <firstname>Doe</firstname>
                  <social_security_no>1800325171545</social_security_no>
                  <birthday>25/03/1980</birthday>
                  <address>Principal, 15</address>
                  <phoneno>0040722222222</phoneno>
                  <acc>
                    <transaction>200</transaction>
                    <transaction>150</transaction>
                    <transaction>-23</transaction>
                  </acc>
                  <acc>
                    <transaction>450</transaction>
                  </acc>
                  <acc>
                    <transaction>800</transaction>
                    <transaction>320</transaction>
                    <transaction>-125</transaction>
                  </acc>
                </PERS_INFO>
                <PERS_INFO>
                  <lastname>Smith</lastname>
                  <firstname>Pop</firstname>
                  <social_security_no>2851211173377</social_security_no>
                  <birthday>11/12/1985</birthday>
                  <address>FirstAvenue, 20</address>
                  <phoneno>0040744444444</phoneno>
                  <acc>
                    <transaction>444</transaction>
                    <transaction>550</transaction>
                  </acc>
                  <acc>
                    <transaction>113</transaction>
                    <transaction>-50</transaction>
                    <transaction>89</transaction>
                  </acc>
                  <acc>
                    <transaction>300</transaction>
                  </acc>
                </PERS_INFO>
              </doc>') xml_column FROM DUAL
-- The above simulates your table.  Only the below matters.
SELECT xt.First_Name, xt.birth_day, xt2.acc_rn, xt3.trans
  FROM INS_STG1,
       XMLTable('/doc/PERS_INFO'
                PASSING INS_STG1.xml_column
                COLUMNS
                First_Name   VARCHAR2(20) PATH 'firstname',
                Birth_day    VARCHAR2(10) PATH 'birthday',
                acc_xml      XMLType      PATH 'acc') xt,
       XMLTable('/acc'
                PASSING xt.acc_xml
                COLUMNS
                acc_rn       FOR ORDINALITY,
                tran_xml     XMLTYPE      PATH 'transaction') xt2,
       XMLTable('/transaction'
                PASSING xt2.tran_xml
                COLUMNS
                trans        NUMBER       PATH '.') xt3;producesFIRST_NAME           BIRTH_DAY      ACC_RN      TRANS
Doe                  25/03/1980          1        200
Doe                  25/03/1980          1        150
Doe                  25/03/1980          1        -23
Doe                  25/03/1980          2        450
Doe                  25/03/1980          3        800
Doe                  25/03/1980          3        320
Doe                  25/03/1980          3       -125
Pop                  11/12/1985          1        444
Pop                  11/12/1985          1        550
Pop                  11/12/1985          2        113
Pop                  11/12/1985          2        -50
Pop                  11/12/1985          2         89
Pop                  11/12/1985          3        300Now ... there is probably a better XQuery way to pull that off, but I'll save that example for someone better at XQuery than myself.
I will also include that it is possible all this work could be done in a single SQL statement as shown by
[url http://odieweblog.wordpress.com/2012/05/10/how-to-load-xml-data-into-multiple-tables/]How To : Load XML data into multiple tables