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Debug PL/SQL Web Pages

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What happens when you can’t get a PL/SQL Web Toolkit to work because it only prints to a web page? That’s more tedious because any dbms_output.put_line command you embed only prints to a SQL*Plus session. The answer is quite simple, you create a test case and test it inside a SQL*Plus environment.

Here’s a sample web page that fails to run successfully …

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CREATE OR REPLACE
  PROCEDURE html_table_values
  ( name_array   OWA_UTIL.VC_ARR
  , value_array  OWA_UTIL.VC_ARR ) IS
  BEGIN
    /* Print debug to SQL*Plus session. */
    FOR i IN 1..name_array.COUNT LOOP
      DBMS_OUTPUT.put_line('Value ['||name_array(i)||'='||value_array(i)||']');
    END LOOP;
 
    /* Open HTML page with the PL/SQL toolkit. */
    htp.print('<!DOCTYPE html>');
    htp.htmlopen;
    htp.headopen;
    htp.htitle('Test');
    htp.headclose;
    htp.bodyopen;
    htp.line;
    htp.print('Test');
    htp.line;
    htp.bodyclose;
    htp.htmlclose;
END;
/

You can test the program with the following anonymous block as the SYSTEM user, which is equivalent to the following URL:

http://localhost:8080/db/html_table_values?begin=1004&end=1012

The following test program lets you work:

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DECLARE
  x  OWA_UTIL.VC_ARR;
  y  OWA_UTIL.VC_ARR;
BEGIN
  /* Insert first row element. */
  x(1) := 'begin';
  y(1) := '1004';
 
  /* Insert second row element. */
  x(2) := 'end';
  y(2) := '1012';
 
  /* Call the anonymous schema's web page. */
  anonymous.html_table_values(x,y);
END;
/

It should print:

Value [begin=1004]
Value [end=1012]

I hope this helps those looking for a solution.

Written by maclochlainn

May 16th, 2016 at 5:18 pm

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