XML from the interlaced lines of two Tables?

I'm trying to generate XML data from interlaced lines of two relational tables that have a common FK, and I can't have enough to get the concept / syntax right. for example:
CREATE TABLE A (
  PK_A NUMBER ,
  FK     NUMBER ,
  C       VARCHAR2(100) ,
  D       VARCHAR2(100) 
) ;

CREATE TABLE B (
  PK_B NUMBER ,
  FK     NUMBER ,
  E       VARCHAR2(100) ,
  F       VARCHAR2(100) 
) ;

... load some data into both tables so B always has one more row than A for the any FK ...

  FUNCTION Get_XML(
    FK_In IN a.fk%TYPE
  ) RETURN XMLType
  IS
    TYPE A_Table_Type IS TABLE OF a%ROWTYPE ;
    TYPE B_Table_Type IS TABLE OF b%ROWTYPE ;
    TYPE XML_Table_Type IS TABLE OF XMLType INDEX BY PLS_INTEGER ;
    my_A_Table A_Table_Type ;
    my_B_Table B_Table_Type ;
    my_XML_Table XML_Table_Type ;
    my_Return_XML XMLType ;
    t NUMBER := 0 ;  -- my_A_Table index
    x PLS_INTEGER := 1 ;  -- my_XML_Table index
  BEGIN
    SELECT * BULK COLLECT INTO my_A_Table FROM a WHERE ( fk = FK_In ) ;
    SELECT * BULK COLLECT INTO my_B_Table FROM b WHERE ( fk = FK_In ) ;
    FOR i IN 1..my_B_Table.COUNT LOOP
      SELECT XMLElement( "B" , XMLAttributes( my_B_Table(i).E AS "ID" ) )
        INTO my_XML_Table( x ) FROM dual ;
      x := x + 1 ;
      IF ( t < my_B_Table.COUNT ) THEN
        t := t + 1 ;
        SELECT XMLElement( "A" , XMLAttributes( my_A_Table(t).C AS "ID" ) )
          INTO my_XML_Table( x ) FROM dual ;
        x := x + 1 ;
      END IF ;
    END LOOP ;
    SELECT XMLAgg( SELECT * FROM TABLE( my_XML_Table ) INTO my_Return_XML FROM dual ;
    RETURN my_Return_XML ;
  END Get_XML ;
-----

The statement "SELECT XMLAgg (... "does not, compile with one" ORA-00936: lack the expression "error." Using an associative array of XMLType is my last attempt to build up interlaced table A / B XML fragments in a single global XML fragment. At first, I just tried to XMLConcat each query results directly in my_Return_XML.

--
Alex

Hello

I see two problems here:

(1) lack of parentheses around SELECT it and closing XMLAgg:

SELECT XMLAgg( ( SELECT * FROM TABLE( my_XML_Table ) ) ) INTO my_Return_XML FROM dual ;

(2) you cannot use the TABLE function with a type declared for PL/SQL. You must create a SQL type and declare a collection of this type.
Alternatively, you can use SYS. XMLSEQUENCETYPE (varray of XMLType).

Anyway, is there a simpler approach?
For example, using a single SELECT statement:

SQL*Plus: Release 10.1.0.4.2 - Production on Mar. Mars 30 11:32:08 2010

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Connecté à :
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> CREATE TABLE A (
  2    PK_A NUMBER ,
  3    FK     NUMBER ,
  4    C       VARCHAR2(100) ,
  5    D       VARCHAR2(100)
  6  ) ;

Table créée.

SQL> CREATE TABLE B (
  2    PK_B NUMBER ,
  3    FK     NUMBER ,
  4    E       VARCHAR2(100) ,
  5    F       VARCHAR2(100)
  6  ) ;

Table créée.

SQL> INSERT INTO a
  2  SELECT level, '1', 'A:VALUE '||to_char(level,'fm09'), 'A:VALUE '||to_char(level,'fm09')
  3  FROM dual
  4  CONNECT BY level <= 10;

10 ligne(s) créée(s).

SQL> INSERT INTO b
  2  SELECT level, '1', 'B:VALUE '||to_char(level,'fm09'), 'B:VALUE '||to_char(level,'fm09')
  3  FROM dual
  4  CONNECT BY level <= 11;

11 ligne(s) créée(s).

SQL> commit;

Validation effectuée.

SQL> set long 500
SQL> set pagesize 50
SQL> variable fk number;
SQL> exec :fk := 1;

Procédure PL/SQL terminée avec succès.

SQL> SELECT xmlagg(
  2           xmlelement(evalname(ename), xmlattributes(id)) order by rn
  3         ).extract('/*') --< for formatting purpose
  4         as xmldoc
  5  FROM (
  6    SELECT 2*rownum-1 as rn,
  7           'B'        as ename,
  8           e          as id
  9    FROM b
 10    WHERE fk = :fk
 11    UNION ALL
 12    SELECT 2*rownum,
 13           'A',
 14           c
 15    FROM a
 16    WHERE fk = :fk
 17  );

XMLDOC
--------------------------------------------------------------------------------

Interlacing is made in the inner query by assigning same ROWNUMs odd and table A to table B.

Tags: Database

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