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2649 - Length, size or capacity in Java?
You get the length of an array, but you ask about the size() of an ArrayList, and you can inquire into the capacity() of a StringBuffer. Aren't they really all the same sort of thing? Which does Java use in which circumstance? Java uses the word length when you're asking about something that can b ....

2648 - Java arrays - are they true arrays or not?
Java's arrays are "true" arrays, in that they occupy sequential memory locations in which they are looked up by position number, so that access can be very fast. But that does mean that once an array has been defined to be a certain size, it cannot be resized in situ. Fortunately, Java is a dynami ....

2647 - Removing duplicates from a MySQL table
Surely there's got to be an easy way to remove duplicate records from a MySQL table? With a well designed table that has a unique primary key, you can simply get rid of a few duplicates, but if there are a lot of 'em, it's time consuming. You could write some sort of complex delete based on a sele ....

2646 - Compile but do not run PHP - syntax check only
The -l option to PHP on the command line compiles but does not run the code in the file - so it's very useful for syntax checking your code. Here's an example where I tested a file with a deliberate mistake: -bash-3.2$ php -l wsse.php Parse error: syntax error, unexpected '{', expecting '(' in ws ....

2645 - Optimising and caching your MySQL enquiries
If you want to get a list of all the different values in a column, but don't care how many times each occurs, you can apply the DISTINCT keyword on your SELECT. See [here]. The DISTINCTROW is a synonym of DISTINCT, and the default is ALL which you may also state. MySQL Caches queries - so that if ....

2644 - Counting rows in joined MySQL tables
Yesterday, I showed you how to join two database tables and get out all matching records, and records which are "orphans" too - records in the left hand table that don't match anything in the right hand table, and vice versa. Yesterday's archive is [here] and our long standing tutorial on joins whi ....

2643 - Relating tables with joins in MySQL
Relational Databases are stores of data in which that data can be matched using common characteristics. For example, I have a table of data about programming languages (which includes a columns for the name of the language and the author) and another table of data about our courses which includes th ....

2642 - What does a web application look like under Tomcat?
When you're deploying a Java application on your web server, you're likely to be using a container engine such as Tomcat ([learn about tomcat]). If you're not the author of the application, it will probably come to you in a file with a .war extension - a Web ARchive file. A .war file contains load ....

2641 - Object Oriented Programming in PHP
New ... for the first time ever ... our Object Oriented PHP Programming training course is running on a Monday. That's Monday, 26th April 2010. It then revert to Friday - its more normal day of the week - in May. PHP's roots were not object oriented ... and in the early days of it being used for ....

2640 - How is your tax pound spent?
Where does the UK Government Spend your Money? What proportion goes on Defence, on Pensions, or Foreign Aid, on Economic Development, and on Health? Is the same amount spent for each person in the South West as in London and in Scotland? If you can answer these questions I'll be very impressed . ....

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