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Category Archives: Databases
Book review: PHP and MySQL for Dynamic Web Sites: Visual QuickPro Guide, 4th Edition by Larry Ullman
I bought PHP and MySQL for Dynamic Web Sites: Visual QuickPro Guide (4th Edition) to use as a set book for an online intermediate PHP class that I teach. I previously used Web Database Applications with PHP & MySQL by … Continue reading
More nifty SQL: insert if not exists
Quite often you want to insert a record into a table, but only if it doesn’t already exist. OK, you could first do a SELECT query to check for existence, and then do the insert, but it’s clumsy and raises … Continue reading
ADODB database abstraction library for PHP
I’ve been using this library for years to make my database interface code database-independent, but I am still discovering new useful functions. Case in point: today I was using the handy rs2csv function, which outputs a recordset to a CSV … Continue reading
SQL query to find duplicate rows
This is one of those things I can never remember how to do when I need to do it. I don’t know why, it’s really quite simple: SELECT emailaddress, firstname, lastname, COUNT(emailaddress) FROM customers GROUP BY emailaddress HAVING COUNT(emailaddress) > … Continue reading
Chocs To Go is here!
The goal for students on the intermediate PHP and MySQL course that I’m running for IWA/HWG is to create a working shopping cart. The course starts in only three days, and I decided I’d better walk the walk and prove … Continue reading
Another handy SQL Server utility
Why doesn’t SQL Server come with a built-in method for generating SQL dump files so you can easily port your data to another database? Microsoft in its own little walled garden I suppose; while the facilities in Enterprise Manager for … Continue reading
Intermediate PHP and MySQL course
Since 1999 I’ve been teaching online for the Open University. It may not pay brilliantly, but it’s regular income and I really enjoy doing it; OU students often overcome major barriers to achieve a qualification they missed out on earlier … Continue reading
Date handling in PHP and MySQL
It’s always a real headache manipulating dates between PHP and MySQL, because PHP’s date functions assume Unix timestamps, while MySQL has its own internal date format. They both have excellent built-in functions for handling dates, but they are fundamentally incompatible. … Continue reading
SQSH!
About the only reason I ever boot into Windows on the spare PC nowadays is because I need to use Enterprise Manager or Query Analyser to manage a SQL Server database. Today it was inconvenient to reboot, because I was … Continue reading
How to install ODBC on Linux
I have been looking for a while for a tool to create Entity Relationship Diagrams (ERDs) on Linux. On Windows I used Dezign for Databases, an excellent tool which I would still be using if it was available for Linux. … Continue reading