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Perl module P308
Using SQL Databases from Perl
Exercises, examples and other material relating to training module P308. This topic is presented on public courses MySQL, Perl for Larger Projects

Perl accesses information held in relational databases through the DBI module, with additional modules (known as DBD modules) used to provide the specific code for individual database products such as MySQL. This module covers the sourcing and downloading of the DBI and DBD modules, and the use of DBI from within Perl. You don't use DBD directly, which ensures that your Perl code is very portable.

Related technical and longer articles
Interfacing applications to a MySQL database engine

Articles and tips on this subjectupdated
3099Perl - database access - DBD, DBI and DBIx modules
Perl's DBI module provides an excellent link from SQL databases to Perl, and the assorted DBD modules that fit underneath it allow it to operate well for a whole lot of different databases. But they are only excellent as far as they go - for the SQL statements have to be generated in your application ...
2010-12-24
 
2561The future of MySQL
MySQL has grown from a very neat little open source database 10 years ago into a very powerful and widespread database that's not always fully open source any longer today. The MySQL company was bought out by Sun a couple of years back (January 2008), and in turn Oracle are now buying Sun. This deal ...
2010-01-03
 
2381Checking the database connection manually
For an initial database connectivity test from my own code, I use the mysql client program and 'check out' the commands manually through that. Noting all the parameters, I then check through a piece of code in my target language ... in this brief example from Wednesday, it was Perl: use DBI;   # ...
2009-08-28
 
1904Ruby, Perl, Linux, MySQL - some training notes
We have just come to the end of a solid 12 days of training ... and we are just getting ready for the next week, with delegates arriving this evening. There's a lot going on behind the scenes, even over this weekend, with the hotel to be prepared as well as the training course. (Picture - our clean ...
2008-11-24
(longest)
1885Hiding a MySQL database behind a web page
"Keep the browser simple - with a single route in (http) to a server." That's the philosophy behind the web and one of the things that's made it a huge success. It means that a straightforward browser can contact a single server, and Joe Public, Joan Whiting and Mahatma Ali can all view content. But ...
2008-11-16
 
1224Object Relation Mapping (ORM)
Another technical term? Yes - this one is a formal name for how you convert a database into Objects - applicable to any OO language (Perl, Python, PHP, Java ...) Let's reduce it to basics. * SQL Tables become object classes * Table rows each become individual objects * Individual columns become attributes. OK ...
2007-06-12
 
975Answering ALL the delegate's Perl questions
During courses, questions arise. "I'll get back to that" could make people feel that I'm brushing something off ... except that I explain, early on, that some questions require a great deal of background knowledge to be answered sensibly. And I keep a list of topics that I'll be getting back to ...
2006-12-09
 
515MySQL - an FAQ
We're becoming a serious MySQL resource, with many technical articles, examples, forum posts and blog entries answering those difficult-to-resolve issues you may have come across. You might like to bookmark (or link to) this page. Eleven recent articles on MySQL ... Flashbulb moments - facts that ...
2006-06-09
 
644Using a MySQL database from Perl
Both Perl and MySQL are major pieces of open source software with a multitude of facilities available - yet you can use them together with just a tiny piece of software "glue" - the DBI and DBD::MySQL module pair from the CPAN (comprehensive Perl archive network). Once you've got Perl and MySQL installed, ...
2006-06-09
 
Examples from our training material
D1.pl   SQLite - DBD and DBI - create, insert, select, drop
D2.pl   Adding DBIx on top of DBI and DBD - First simple example
D2.sql   Sample people database
D2_Main.pm   First DBIx Demonstration - headline file for loading Schema
D2_Main_People.pm   Define the table to object data mapping
D3.pl   Adding DBIx on top of DBI and DBD - Select on joined tables
D3.sql   SQL source data for D3 demo (SQLite / DBIx / Perl)
D3_Main.pm   Second DBIx Demonstration - headline file for loading Schema
D3_Main_Computers.pm   Define table to object data mapping for Computers and link to people
D3_Main_People.pm   Define table/object data mapping for People and how they relate to Computers
aclog2table   Set up database for web access log records
aggy   Connecting Perl to a MySQL database
dbdhash.pm   Tie a Perl hash to a MySQL table through DBI
edbi   Example using many database access methods from DBI
fifthdbi   Perl DBI - display contents of MySQL table
firstdbi   Simple Perl DBI Query
hellosql   Accessing and SQL database with DBI and DBD modules
orange.pl   DBI used in a CGI script as a GUI to a table
sqlping   Using DBI and DBD to establish a connection and list available tables
tie_main   Exercise - main program to die hash to database
trains.sql   Data to create and populate train table for other examples
traintimes   Connect to an SQL database of train times
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.
Topics covered in this module
Flat databases.
Relational databases through SQL - Setup.
Checking that your relational database is available.
Installing the database independent module (DBI).
Install the Database Dependent drivers for MySQL.
Using DBI to access a MySQL database.
A further example.
Other databases.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.


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