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Monthly Archives: April 2006

Converting unix or java timestamps (time since the epoch) to real dates with Oracle

By carson | Published: April 29, 2006
A few days ago I made use of a couple Oracle built in functions and it made me happy I didn't have to write a stored proc or some type of mini-app to do it. I needed to parse a timestamp out of a field that was put there by a java program. The timestamp [...]
Posted in database administration | Tagged | Leave a comment

Thread pooling with Java concurrency utilities new (java 1.5) and old (util.concurrent)

By carson | Published: April 24, 2006
Java Concurrency in Practice Threading in java is fairly easy and now with java 1.5 some of the stuff that was harder has become even easier. A few years ago someone pointed me to a site that had some concurrency utils that where the precursor to what are now the concurrent utils in java 1.5. [...]
Posted in java | Comments closed

Good Techcrunch review of mapping apis

By carson | Published: April 18, 2006
Techcrunch has a good review by Frank Gruber of the look and feel of mapping services. I think it is notable that ESRI's service is not included in the review. I think it is at least as good as the mapquest service. I may have to find time to redo my review of the acuracy [...]
Posted in gis | Leave a comment

Approximating a circle with a polygon

By carson | Published: April 18, 2006
I recently had an opportunity to use ESRI's ArcSDE again. It is a spatial database interface and in this instance I was using the java api. I wanted to change what used to be a query using a rectangle into a query using a circle. For some reason parts of the java api for ArcSDE [...]
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Using strptime to parse ISO 8601 formated timestamps

By carson | Published: April 15, 2006
A lot of dates that come back from XML based web services are in the ISO 8601 form. I found out recently that it isn't straight forward to parse such a date using C functions and have the time come out in the correct timezone. It isn't rocket science but it is a lot more [...]
Posted in programming | Tagged | 2 Comments

Howto base64 encode with C/C++ and OpenSSL

By carson | Published: April 11, 2006
I've been doing a little C programming lately and I have found that if you have a up to date distribution of linux there are a lot of libraries out there that make doing things you do in other languages like java easier.
Posted in programming | Tagged , , | 10 Comments

AJAX file upload progress for Java using commons fileupload and prototype

By carson | Published: April 2, 2006
This has been done before with PHP (AJAX upload progress meter for PHP) etc but I needed something a little different because I wanted to upload a file and then have it loaded into a database. I looked around and found that someone had already made something that used the commons file upload package to [...]
Posted in programming | Tagged , , | 9 Comments