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Oracle PL/SQL - Creative Conditional Compilation

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Abstract: Oracle released a feature in 10g Release 2 they thought worthy of facilitating in previous versions via patch sets - so I thought it was worthy enough for a closer look.

Conditional compilation isn't a foreign concept in the programming world, and for the developer aficionado it's a wonderful paradigm to explore.

Conditional compilation was designed with the main intention of being able to create database version specific code. With the recent advent of 11g, developers can actually start adding 11g features to their 10g code today!

However it provides the savvy PL/SQL developer to enhance their code in more ways than just gearing up for the next release… Dust of your software engineering hats and discover how to utilise conditional compilation to explore concepts such as latent self tracing code; latent assertions; and enhanced prototyping for your unit tests.

This seminar will illustrate several examples of conditional compilation that will open your mind; ultimately benefit your users; and can be implemented as far back as 9.2!

Published in: Data & Analytics, Technology
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  • DOWNLOAD THIS BOOKS INTO AVAILABLE FORMAT (2019 Update) ......................................................................................................................... ......................................................................................................................... Download Full PDF EBOOK here { https://soo.gd/irt2 } ......................................................................................................................... Download Full EPUB Ebook here { https://soo.gd/irt2 } ......................................................................................................................... Download Full doc Ebook here { https://soo.gd/irt2 } ......................................................................................................................... Download PDF EBOOK here { https://soo.gd/irt2 } ......................................................................................................................... Download EPUB Ebook here { https://soo.gd/irt2 } ......................................................................................................................... Download doc Ebook here { https://soo.gd/irt2 } ......................................................................................................................... ......................................................................................................................... ................................................................................................................................... eBook is an electronic version of a traditional print book THIS can be read by using a personal computer or by using an eBook reader. (An eBook reader can be a software application for use on a computer such as Microsoft's free Reader application, or a book-sized computer THIS is used solely as a reading device such as Nuvomedia's Rocket eBook.) Users can purchase an eBook on diskette or CD, but the most popular method of getting an eBook is to purchase a downloadable file of the eBook (or other reading material) from a Web site (such as Barnes and Noble) to be read from the user's computer or reading device. Generally, an eBook can be downloaded in five minutes or less ......................................................................................................................... .............. Browse by Genre Available eBooks .............................................................................................................................. Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, ......................................................................................................................... ......................................................................................................................... .....BEST SELLER FOR EBOOK RECOMMEND............................................................. ......................................................................................................................... Blowout: Corrupted Democracy, Rogue State Russia, and the Richest, Most Destructive Industry on Earth,-- The Ride of a Lifetime: Lessons Learned from 15 Years as CEO of the Walt Disney Company,-- Call Sign Chaos: Learning to Lead,-- StrengthsFinder 2.0,-- Stillness Is the Key,-- She Said: Breaking the Sexual Harassment Story THIS Helped Ignite a Movement,-- Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones,-- Everything Is Figureoutable,-- What It Takes: Lessons in the Pursuit of Excellence,-- Rich Dad Poor Dad: What the Rich Teach Their Kids About Money THIS the Poor and Middle Class Do Not!,-- The Total Money Makeover: Classic Edition: A Proven Plan for Financial Fitness,-- Shut Up and Listen!: Hard Business Truths THIS Will Help You Succeed, ......................................................................................................................... .........................................................................................................................
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Oracle PL/SQL - Creative Conditional Compilation

  1. 1. SAGE Computing Services Customised Oracle Training Workshops and Consulting Creative Conditional Compilation … and “raising the bar” with yourPL/SQL Sco tt We sle y Systems Consultant
  2. 2. The example everybody’s seen… FUNCTION qty_booked(p_resource IN VARCHAR2 ,p_date IN DATE) RETURN NUMBER $IF dbms_db_version.ver_le_10 $THEN $ELSE RESULT_CACHE $END IS li_total PLS_INTEGER := 0; BEGIN SELECT SUM(b.qty) INTO li_total FROM bookings b, events e WHERE p_date BETWEEN e.start_date AND e.end_date AND b.resource = p_resource; RETURN li_total END qty_booked;
  3. 3. The example everybody’s seen… FUNCTION qty_booked(p_resource IN VARCHAR2FUNCTION qty_booked(p_resource IN VARCHAR2 ,p_date IN DATE),p_date IN DATE) RETURN NUMBERRETURN NUMBER $IF dbms_db_version.ver_le_10 $THEN $ELSE RESULT_CACHE $END ISIS li_total PLS_INTEGER := 0;li_total PLS_INTEGER := 0; BEGINBEGIN SELECT SUM(b.qty)SELECT SUM(b.qty) INTO li_totalINTO li_total FROM bookings b, events eFROM bookings b, events e WHERE p_date BETWEEN e.start_date AND e.end_dateWHERE p_date BETWEEN e.start_date AND e.end_date AND b.resource = p_resource;AND b.resource = p_resource; RETURN li_totalRETURN li_total END qty_booked;END qty_booked;
  4. 4. • PL/SQL User’s Guide & Reference 10g Release 2 – Fundamentals of the PL/SQL Language • Conditional Compilation
  5. 5. Availability • 11g • 10g Release 2 – Enabled out of the box • 10.1.0.4 – Once patched, enabled by default – Disable using “_parameter” • 9.2.0.6 – Once patched, disabled by default – Enable using “_parameter”
  6. 6. Catch 22 INDICES OF
  7. 7. Catch 22 Conditional Compilation Patch INDICES OF
  8. 8. Facilitates removal of unnecessary code at compile time Performance Readability Accuracy Testing It's cool!
  9. 9. Selection Directives $IF boolean_static_expression $THEN text [ $ELSIF boolean_static_expression $THEN text ] [ $ELSE text ] $END Inquiry Directives DBMS_OUTPUT.PUT_LINE($$PLSQL_LINE); ALTER SESSION SET PLSQL_CCFLAGS='max_sentence:100'; IF sentence > $$max_sentence THEN Error Directives $IF $$PLSQL_OPTIMIZE_LEVEL != 2 $THEN $ERROR 'intensive_program must be compiled with maximum optimisation' $END $END Semantics
  10. 10. First demo cc1a cc1b cc1c cc1d
  11. 11. Inquiry Directives
  12. 12. << anon >> BEGIN DBMS_OUTPUT.PUT_LINE('Unit:'||$$PLSQL_UNIT); DBMS_OUTPUT.PUT_LINE('Line:'||$$PLSQL_LINE); END anon; / Unit: Line:4
  13. 13. > CREATE OR REPLACE PROCEDURE sw_test IS BEGIN DBMS_OUTPUT.PUT_LINE('Unit:'||$$PLSQL_UNIT); DBMS_OUTPUT.PUT_LINE('Line:'||$$PLSQL_LINE); END sw_test; / Procedure created. > exec sw_test Unit:SW_TEST Line:4
  14. 14. ALTER SESSION SET PLSQL_CCFLAGS = 'max_sentence:100'; Session altered.
  15. 15. > BEGIN IF p_sentence > $$max_sentence THEN DBMS_OUTPUT.PUT_LINE('Parole Available'); ELSE DBMS_OUTPUT.PUT_LINE('Life'); END IF; END; / Life
  16. 16. ALTER SYSTEM SET PLSQL_CCFLAGS = 'VARCHAR2_SIZE:100, DEF_APP_ERR:-20001'; DECLARE lc_variable_chr VARCHAR2($$VARCHAR2_SIZE); e_def_app_err EXCEPTION; PRAGMA EXCEPTION_INIT (e_def_app_err, $$DEF_APP_ERR); BEGIN --> rest of your code END anon; /
  17. 17. Reuse Settings
  18. 18. ALTER SESSION SET PLSQL_CCFLAGS = 'MY_PI:314'; CREATE OR REPLACE PROCEDURE universe_alpha IS BEGIN DBMS_OUTPUT.PUT_LINE('Alpha pi = '||$$my_pi/100); END; CREATE OR REPLACE PROCEDURE universe_gamma IS BEGIN DBMS_OUTPUT.PUT_LINE('Gamma pi = '||$$my_pi/100); END; CREATE OR REPLACE PROCEDURE universe_oz IS BEGIN DBMS_OUTPUT.PUT_LINE('Oz pi = '||$$my_pi/100); END;ALTER PROCEDURE universe_alpha COMPILE PLSQL_CCFLAGS = 'MY_PI:289' REUSE SETTINGS; ALTER PROCEDURE universe_gamma COMPILE PLSQL_CCFLAGS = 'MY_PI:423' REUSE SETTINGS; > BEGIN universe_alpha; universe_gamma; universe_oz; END; / Alpha pi = 2.89 Gamma pi = 4.23 Oz pi = 3.14
  19. 19. Some actual examples?
  20. 20. Using new version code today $IF dbms_db_version.ver_le_10 $THEN -- version 10 and earlier code $ELSIF dbms_db_version.ver_le_11 $THEN -- version 11 code $ELSE -- version 12 and later code $END
  21. 21. 10.1 vs 10.2 dbms_output
  22. 22. CREATE OR REPLACE PROCEDURE sw_debug (p_text IN VARCHAR2) IS $IF $$sw_debug_on $THEN l_text VARCHAR2(32767); $END BEGIN $IF $$sw_debug_on $THEN -- Let’s provide debugging info $IF dbms_db_version.ver_le_10_1 $THEN -- We have to truncate for <= 10.1 l_text := SUBSTR(p_text, 1 ,200); $ELSE l_text := p_text; $END DBMS_OUTPUT.PUT_LINE(p_text); $ELSE -- No debugging NULL; $END END sw_debug;
  23. 23. CREATE OR REPLACE PROCEDURE sw_debug (p_text INCREATE OR REPLACE PROCEDURE sw_debug (p_text IN VARCHAR2) ISVARCHAR2) IS $IF $$sw_debug_on $THEN l_text VARCHAR2(32767); $END BEGINBEGIN $IF $$sw_debug_on $THEN -- Let’s provide debugging info $IF dbms_db_version.ver_le_10_1 $THEN -- We have to truncate for <= 10.1 l_text := SUBSTR(p_text, 1 ,200); $ELSE l_text := p_text; $END DBMS_OUTPUT.PUT_LINE(p_text); $ELSE$ELSE -- No debugging-- No debugging NULL;NULL; $END$END END sw_debug;END sw_debug;
  24. 24. CREATE OR REPLACE PROCEDURE sw_debug (p_text INCREATE OR REPLACE PROCEDURE sw_debug (p_text IN VARCHAR2) ISVARCHAR2) IS $IF $$sw_debug_on $THEN$IF $$sw_debug_on $THEN l_text VARCHAR2(32767);l_text VARCHAR2(32767); $END$END BEGINBEGIN $IF $$sw_debug_on $THEN$IF $$sw_debug_on $THEN -- Let’s provide debugging info-- Let’s provide debugging info $IF dbms_db_version.ver_le_10_1 $THEN -- We have to truncate for <= 10.1 l_text := SUBSTR(p_text, 1 ,255); $ELSE$ELSE l_text := p_text;l_text := p_text; $END$END DBMS_OUTPUT.PUT_LINE(p_text);DBMS_OUTPUT.PUT_LINE(p_text); $ELSE$ELSE -- No debugging-- No debugging NULL;NULL; $END$END END sw_debug;END sw_debug;
  25. 25. 10g vs 11g result_cache FUNCTION quantity_ordered (p_item_id IN items.item_id%TYPE) RETURN NUMBER $IF dbms_version.ver_le_10 $THEN -- nothing $ELSE RESULT_CACHE $END IS BEGIN ...
  26. 26. 9i vs 10g Bulk Insert
  27. 27. CREATE OR REPLACE PACKAGE BODY sw_bulk_insert IS PROCEDURE sw_insert (sw_tab IN t_sw_tab) IS BEGIN $IF dbms_db_version.ver_le_9 $THEN DECLARE l_dense t_sw_tab; ln_index PLS_INTEGER := sw_tab.FIRST; BEGIN << dense_loop >> WHILE (l_index IS NOT NULL) LOOP l_dense(l_dense.COUNT + 1) := sw_tab(l_index); l_index := sw_tab.NEXT(l_index); END LOOP dense_loop; FORALL i IN 1..l_dense.COUNT INSERT INTO sw_table VALUES l_dense(i); END; $ELSE FORALL i IN INDICES OF sw_tab INSERT INTO sw_table VALUES sw_tab(i); $END END sw_insert; END sw_bulk_insert;
  28. 28. CREATE OR REPLACE PACKAGE BODY sw_bulk_insert IS PROCEDURE sw_insert (sw_tab IN t_sw_tab) IS BEGIN $IF dbms_db_version.ver_le_9 $THEN DECLARE l_dense t_sw_tab; ln_index PLS_INTEGER := sw_tab.FIRST; BEGIN << dense_loop >> WHILE (l_index IS NOT NULL) LOOP l_dense(l_dense.COUNT + 1) := sw_tab(l_index); l_index := sw_tab.NEXT(l_index); END LOOP dense_loop; FORALL i IN 1..l_dense.COUNT INSERT INTO sw_table VALUES l_dense(i); END; $ELSE$ELSE FORALL i IN INDICES OF sw_tabFORALL i IN INDICES OF sw_tab INSERT INTO sw_tableINSERT INTO sw_table VALUES sw_tab(i);VALUES sw_tab(i); $END$END END sw_insert; END sw_bulk_insert;
  29. 29. CREATE OR REPLACE PACKAGE BODY sw_bulk_insert IS PROCEDURE sw_insert (sw_tab IN t_sw_tab) IS BEGIN $IF dbms_db_version.ver_le_9 $THEN$IF dbms_db_version.ver_le_9 $THEN DECLAREDECLARE l_dense t_sw_tab;l_dense t_sw_tab; ln_index PLS_INTEGER := sw_tab.FIRST;ln_index PLS_INTEGER := sw_tab.FIRST; BEGINBEGIN << dense_loop >><< dense_loop >> WHILE (l_index IS NOT NULL) LOOPWHILE (l_index IS NOT NULL) LOOP l_dense(l_dense.COUNT + 1) := sw_tab(l_index);l_dense(l_dense.COUNT + 1) := sw_tab(l_index); l_index := sw_tab.NEXT(l_index);l_index := sw_tab.NEXT(l_index); END LOOP dense_loop;END LOOP dense_loop; FORALL i IN 1..l_dense.COUNTFORALL i IN 1..l_dense.COUNT INSERT INTO sw_table VALUES l_dense(i);INSERT INTO sw_table VALUES l_dense(i); END;END; $ELSE FORALL i IN INDICES OF sw_tab INSERT INTO sw_table VALUES sw_tab(i); $END END sw_insert; END sw_bulk_insert;
  30. 30. Paradigm Examples
  31. 31. Latent debugging code
  32. 32. CREATE OR REPLACE PACKAGE pkg_debug IS debug_flag CONSTANT BOOLEAN := FALSE; END pkg_debug; / CREATE OR REPLACE PROCEDURE sw_proc IS BEGIN $IF pkg_debug.debug_flag $THEN dbms_output.put_line ('Debug=T'); $ELSE dbms_output.put_line ('Debug=F'); $END END sw_proc; /
  33. 33. Assertions
  34. 34. “Assertions should be used to document logically impossible situations — Development tool Testing Aid In-line Documentation if the ‘impossible’ occurs, then something fundamental is clearly wrong. This is distinct from error handling.” Run-time Cost
  35. 35. Latent Assertions
  36. 36. “The removal of assertions from production code is almost always done automatically. It usually is done via conditional compilation.”
  37. 37. $IF $$asserting OR CC_assertion.asserting $THEN IF p_param != c_pi*r*r THEN raise_application_error(.. END IF; $END -- individual program unit -- entire application
  38. 38. Testing subprograms only in package body
  39. 39. CREATE PACKAGE universe IS PROCEDURE create_sun; PROCEDURE create_planets; -- CC test procedure PROCEDURE test_orbit; END universe; CREATE PACKAGE BODY universe IS -- Private PROCEDURE orbit IS .. END; -- Public PROCEDURE create_sun IS .. END; PROCEDURE create_planets IS .. END; -- Testers PROCEDURE test_orbit IS BEGIN $IF $$testing $THEN orbit; $ELSE RAISE program_error; $END END test_orbit; END universe;
  40. 40. CREATE PACKAGE universe IS PROCEDURE create_sun; PROCEDURE create_planets; -- CC test sequence PROCEDURE test_run; END universe; CREATE PACKAGE BODY universe IS -- Private PROCEDURE orbit IS .. END; -- Public PROCEDURE create_sun IS .. END; PROCEDURE create_planets IS .. END; -- Test sequence PROCEDURE test_run IS BEGIN $IF $$testing $THEN create_sun; create_planets; orbit; $ELSE RAISE program_error; $END END test_run; END universe;
  41. 41. Mock objects
  42. 42. FUNCTION get_emp(p_emp_id IN emp.emp_id%TYPE) RETURN t_emp IS l_emp t_emp; BEGIN $IF $$mock_emp $THEN l_emp.emp_name := 'Scott'; .. RETURN l_emp; $ELSE SELECT * FROM emp INTO l_emp WHERE emp_id = p_emp_id; RETURN l_emp; $END END get_emp;
  43. 43. Comparing competing implementations during prototyping
  44. 44. PROCEDURE xyz IS $IF $$alternative = 1 $THEN -- varray declaration $$ELSIF $$alternative = 2 $THEN -- nested table declaration $END BEGIN $IF $$alternative = 1 $THEN -- simple varray solution $$ELSIF $$alternative = 2 $THEN -- elegant nested table solution $END END xyz; PROCEDURE xyz ISPROCEDURE xyz IS $IF $$alternative = 1 $THEN$IF $$alternative = 1 $THEN -- varray declaration-- varray declaration $$ELSIF $$alternative = 2 $THEN$$ELSIF $$alternative = 2 $THEN -- nested table declaration-- nested table declaration $END$END BEGINBEGIN $IF $$alternative = 1 $THEN$IF $$alternative = 1 $THEN -- simple varray solution-- simple varray solution $$ELSIF $$alternative = 2 $THEN$$ELSIF $$alternative = 2 $THEN -- elegant nested table solution-- elegant nested table solution $END$END END xyz;END xyz; $IF $$alternative = 1 $THEN -- first verbose solution that came to mind $$ELSIF $$alternative = 2 $THEN -- some crazy idea you came up with at 3am you need to try out $END
  45. 45. Component Based Installation
  46. 46. PACKAGE BODY core IS PROCEDURE execute_component(p_choice IN VARCHAR2) IS BEGIN CASE p_choice -- Base is always installed. WHEN 'base' THEN base.main(); $IF CC_licence.cheap_installed $THEN WHEN 'cheap' THEN cheap.main(); $END ... $IF CC_licence.pricey_installed $THEN WHEN 'pricey' THEN pricey.main(); $END END CASE; EXCEPTION WHEN case_not_found THEN dbms_output.put_line('Component '||p_choice||' is not installed.'); END execute_component; END core;
  47. 47. Get It Right with the Error Directive
  48. 48. $IF $$PLSQL_OPTIMIZE_LEVEL != 2 $THEN $ERROR 'intensive_program must be compiled with maximum optimisation' $END $END
  49. 49. BEGIN ... /* * * Note to self: Must remember to finish this bit * */ ... END;
  50. 50. BEGIN ... -- Jacko: this doesn’t work, fix before moving to prod! ... END;
  51. 51. 1 CREATE PROCEDURE process_court_outcome IS 2 BEGIN 3 IF lr_victim.age > 18 THEN 4 send_to_prison(lr_victim); 5 ELSE 6 $ERROR 7 'Waiting for business to advise '|| 8 $$PLSQL_UNIT||' line: '||$$PLSQL_LINE 9 $END 10 END IF; 11 END process_court_outcome; 12 / Warning: Procedure created with compilation errors. SQL> sho err LINE/COL ERROR -------- ---------------------------------------- 6/6 PLS-00179: $ERROR: Waiting for business to advise PROCESS_COURT_OUTCOME line: 8
  52. 52. Post-processed Source Demo: cc2
  53. 53. Smaller, Faster Run-Time Code Is in Your Future
  54. 54. Good Practices
  55. 55. Inquiry directives have null values for normal behaviour $IF $$cc_flag = 'x' $THEN cc_code; $END
  56. 56. Choose restriction type carefully $IF $$debug_on OR module_y.cc_debug $THEN sw_debug('Error'); $END
  57. 57. but there’s always this...
  58. 58. SQL> define debug=/* begin &debug select 'conditionally' from dual; -- */ select 'always' from dual; end; /
  59. 59. SAGE Computing Services Customised Oracle Training Workshops and Consulting Questions and Answers? Presentations are available from our website: http: //www. sag e co m puting . co m . au e nq uirie s@ sag e co m puting . co m . au sco tt. we sle y@ sag e co m puting . co m . au http: //triang le -circle -sq uare . blo g spo t. co m

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