| |||||||||||
| |||||||||||
SQLite - DBD and DBI - create, insert, select, drop
Using SQL Databases from Perl example from a Well House Consultants training course
More on Using SQL Databases from Perl [link]
Source code: D1.pl Module: P308
#!/usr/bin/env perl
# SQLite in Perl - DBD and DBI - create, insert, select, drop # Example from first principles use DBI; # Next statement is ONLY one to change for other databases # (you will need to load the right DBD and perhaps give host, user # name and password data too) $db_handle = DBI -> connect('DBI:SQLite:demodatabase.sqlite'); print "\nDemo ... run with \"populate\" parameter to create and load a database\n"; print " run without a parameter to show database content\n"; print " run with \"clear\" parameter to delete a database\n\n"; ########################################################## if ($ARGV[0] =~ /^pop/i){ print "Creating table\n"; %demodata = ( "Swansea" => "Paddington", "Weymouth" => "Waterloo", "Brighton" => "Victoria", "Hastings" => "Charing_Cross", "Margate" => "Victoria"); $db_handle -> do("CREATE TABLE arrivals (afar CHAR(20), near CHAR(20))"); foreach (keys %demodata){ $db_handle -> do("INSERT INTO arrivals VALUES( \"$_\", \"$demodata{$_}\" )"); } ######################################################### } elsif ($ARGV[0] =~ /^cle/i) { print "Dropping table\n"; $db_handle -> do ("DROP TABLE arrivals"); ######################################################### } else { print "Displaying table content\n"; $getkey = $db_handle -> prepare("SELECT * FROM arrivals"); $getkey -> execute; while (@row = $getkey->fetchrow) { print "@row\n"; } } ########################################################## print "Program Completed\n"; __END__ Example of running that: munchkin:pl grahamellis$ perl D1.pl populate Demo ... run with "populate" parameter to create and load a database run without a parameter to show database content run with "clear" parameter to delete a database Creating table Program Completed munchkin:pl grahamellis$ perl D1.pl Demo ... run with "populate" parameter to create and load a database run without a parameter to show database content run with "clear" parameter to delete a database Displaying table content Swansea Paddington Margate Victoria Hastings Charing_Cross Brighton Victoria Weymouth Waterloo Program Completed munchkin:pl grahamellis$ perl D1.pl clear Demo ... run with "populate" parameter to create and load a database run without a parameter to show database content run with "clear" parameter to delete a database Dropping table Program Completed munchkin:pl grahamellis$ perl D1.pl Demo ... run with "populate" parameter to create and load a database run without a parameter to show database content run with "clear" parameter to delete a database Displaying table content DBD::SQLite::db prepare failed: no such table: arrivals at D1.pl line 50. Can't call method "execute" on an undefined value at D1.pl line 51. munchkin:pl grahamellis$ Learn about this subject
This module and example are covered on the following public courses:
* MySQL * Perl for Larger Projects Also available on on site courses for larger groups Books covering this topic
Yes. We have over 700 books in our library. Books
covering Perl are listed here and when you've selected a
relevant book we'll link you on to Amazon to order.
Other Examples
This example comes from our "Using SQL Databases from Perl" training module. You'll find a description of the topic and some
other closely related examples on the "Using SQL Databases from Perl" module index page.
Full description of the source code
You can learn more about this example on the training courses listed on this page,
on which you'll be given a full set of training notes.
Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License. Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre. • The Horse's mouth provides a daily tip or thought. • Further resources are available via the resources centre. • All of these resources can be searched through through our search engine • And there's a global index here. Web site author
Purpose of this website
This is a sample program, class demonstration or answer from a
training course. It's main purpose
is to provide an after-course service to customers who have attended our
public private or
on site courses, but the examples are made
generally available under conditions described below.
Conditions of use
Past attendees on our training courses are welcome to use individual
examples in the course of their programming, but must check
the examples they use to ensure that they are suitable for their
job. Remember that some of our examples show you how not to do
things - check in your notes. Well House Consultants take no responsibility
for the suitability of these example programs to customer's needs.
This program is copyright Well House Consultants Ltd. You are forbidden from using it for running your own training courses without our prior written permission. See our page on courseware provision for more details. Any of our images within this code may NOT be reused on a public URL without our prior permission. For Bona Fide personal use, we will often grant you permission provided that you provide a link back. Commercial use on a website will incur a license fee for each image used - details on request. |
| ||||||||||
PH: 01144 1225 708225 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho PAGE: http://www.wellho.net/resources/ex.php • PAGE BUILT: Sun Oct 11 14:50:09 2020 • BUILD SYSTEM: JelliaJamb |