How to pass parameter in the function extract (for XMLTYPE)

I have a table with XMLTYPE field xml_column PROBLEMXML. In this column, there are many deffinitions for the problem. There is no amount deffinitions max and there can be no definition at all. I need to return all the definitions of all the problems a string wirh separate definitions by '; '.

Query
SELECT extract (prob. Def,'/definitions/definition[1]/@var'). ';'|| excerpt (prob. Def,'/definitions/definition[2]/@var')
OF PROBLEMXML j.
XMLTABLE)
"/ problem.
PASSAGE j.xml_column
Probid VARCHAR COLUMNS (31) PATH ' / problem/@id',
Prob def XMLTYPE PATH ' / problem/definitions ")
where PROBLEM_ID = 1;
Returns exactly what I want one; m.
But
declare
my_variable varchar2 (2000): = null;
number of N1;
number of N2;
Start
N1: = 1;
N2: = 2;
SELECT extract (prob. Def,'/definitions/definition[N1]/@var'). '|'|| excerpt (prob. Def,'/definitions/definition[N2]/@var') in my_variable
OF ETL_PROBLEMXML_STG_T j.
XMLTABLE)
"/ problem.
PASSAGE j.xml_column
Probid VARCHAR COLUMNS (31) PATH ' / problem/@id',
Prob def XMLTYPE PATH ' / problem/definitions ")
where PROBLEM_ID = 1;
dbms_output.put_line ($my_var);
end;
Returns null.
Is there a way to switch the setting to extract the function?

You have string literal death of n1 and n2. Note the change to select it.

DECLARE
  my_var VARCHAR2(2000) := NULL;
  n1     NUMBER;
  n2     NUMBER;
BEGIN
  n1 := 1;
  n2 := 2;
  SELECT extract(prob.def, '/Definitions/Definition[' || n1 || ']/@var') || '|' ||
         extract(prob.def, '/Definitions/Definition[' || n2 || ']/@var')
    INTO my_var
    FROM etl_problemxml_stg_t j,
         xmltable('/problem' passing j.xml_column columns probid VARCHAR(31) path '/problem/@id',
                  def xmltype path '/problem/Definitions') prob
   WHERE problem_id = 1;
  dbms_output.put_line(my_var);
END;

Published by: RPuttagunta on December 13, 2010 09:18

Tags: Database

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