1. Perl DBI usage at report building Joe Jiang [email_address]

2. Perl Language Practical Extraction and ... Reporting Language

3. Perl Programmer Laziness Impatience Hubris (Boldness)

4. DBMS Database Management (descide) System

5. DBI.pm The gate to Management level programming

6. Back to reporting The man in breau The game they played The suggestion I once made on OLAP

7. Chemical Perl (Gas-ware) PHP for website Python for architecture Ruby for rails Perl for what?

8. Reports again DMBS is the container SQL is for query Perl is the formater

9. Give me Excel Copy HTML table into Excel Or, name HTML as .xls Use some IDE tool?

10. Toolset basic $ echo 'select SESSION_ID, HIT_ID from hit where USERNAME=? and ACCESS_TIME between to_date(?,?) and to_date(?,?)' > session.sql ↵

11. It worked $ bofc < session.sql user-123 201106122345 YYYYMMDDHH24MI 201106122357 YYYYMMDDHH24MI | wc -l ↵ SESSION_ID HIT_ID 12

12. And ... $ bofc < session.sql user-123 201106122345 YYYYMMDDHH24MI 201106122357 YYYYMMDDHH24MI | sort ↵ SESSION_ID HIT_ID 20110612234046 1772475805 20110612234046 1772475807 20110612234046 1772475809 20110612234046 1772475811 20110612234046 1772475813 ...

14. works with parameter binding (Boldness)

15. purify the SQL with limited punctuaction (Impatience)

16. Camel coding PERL5LIB=/proj/Web/EMIS/Modules perl -MEMIS::Database -le '($s= do{$d=EMIS::Database::gethandle(q(CDB)); $d->do(q(begin; nls_format_setting; end;)); $d}->prepare_cached(join q(),<STDIN>))->execute(@ARGV); $,=qq(); print STDERR @{$s->{NAME}}; print @r while @r=$s->fetchrow_array; $d->disconnect' $*

18. -le ' ... '

19. $s = do { $d=...; ...; $d } -> prepare_cached( join q(),<STDIN>)

20. ( $s = ... ) -> excute ( @ARGV );

21. $, = qq( );

22. print STDERR @{$s->{NAME}};

23. print @r while @r=$s->fetchrow_array;

24. emp #!/usr/bin/perl -l use DBI; $s = do { DBI-> connect ( q(DBI:mysql:database=employees) , q() , q() ); }->prepare_cached( join ( q() ,<>) ); $s->execute ( @ARGV ); $, = qq( ) ; print STDERR @{$s->{ NAME }} ; print @r while @r = $s->fetchrow_array ;

25. Work Horse But I want query more than one DB ... Can you send me another column? Make a comma seperated list in one column ...

27. SQL no longer in STDIN

28. Here comes loop

30. $s->execute(@F);

31. @r=$s->fetchrow_array;

32. @x = map {q()} @r unless @x;

33. IO::Handle::autoflush STDOUT 1;

34. emp-for #!/usr/bin/perl -wlan use DBI; use IO::Handle; BEGIN { $s = do { DBI-> connect ( q(DBI:mysql:database=employees) , q() , q() ); }->prepare_cached( do { open ( SQL , q(<) , shift ); join ( q() , <SQL> ) }); autoflush STDOUT 1 ; $, = qq( ) ; } END { $s->finish ; $d->disconnect ; close SQL ; } $s->execute ( @F ); if ( @r = $s->fetchrow_array ) { print @r ; @x = map { q() } @r unless @x } else { print @x }

35. How to list last deptartment? $ echo 'select emp_no from employees limit 3'|emp 2>/dev/null ↵ 10001 10002 10003 $ echo 'select emp_no from employees limit 3'|emp 2>/dev/null| emp-for emp_dept.sql ↵ d005 d007 d004

37. xargs for columns

38. Easier than outer join

39. Update? It's easy

41. Avoid the &quot;no where&quot; update fault

42. Save a lot of coding with perl -lan

43. Or compose the code for debugging purpose

44. Extensions Merge Rotate Wrap

46. map { $_->getline } @f

47. join (qq(), map { m{(.*)} && $1 } ...

48. print ... until m{^+$}

50. push @lines, [@F];

51. END{ ... }

52. $ea=each_arrayref(@lines);

53. print join qq(), @x while @x=$ea->();

54. Demo usage How to describe a wide table? With sample data attached?

55. Columns $ echo 'select DATA_TYPE, CHARACTER_MAXIMUM_LENGTH from information_schema.columns where table_name=?'| emp employees | tee emp-desc ↵ DATA_TYPE CHARACTER_MAXIMUM_LENGTH int date varchar 14 varchar 16 enum 1 date

56. Demo Row $ echo 'select * from employees limit 1' | emp 2>&1 | row2col | tee emp-data ↵ emp_no 10001 birth_date 1953-09-02 first_name Georgi last_name Facello gender M hire_date 1986-06-26

57. And now? Run merge-tab over the two files $ merge-tab emp.data emp.desc ↵ emp_no 10001 int birth_date 1953-09-02 date first_name Georgi varchar 14 last_name Facello varchar 16 gender M enum 1 hire_date 1986-06-26 date

59. $s->write_unicode($.-1, $_, encode q(utf16), decode q(utf8), $F[$_])

60. perl -MText::CSV_XS

62. $z->addString($_, $F[0])->desiredCompressionMethod(8);

63. END { $z->writeToFileHandle(STDOUT) }

64. Thanks Any Question? http://weibo.com/saved2serve