Constraints enables business rules to be enforced by the database instead of via application code. Through the judicious use of constraints, application and SQL coding can be minimized and data integrity can be maximized. Constraints may be applied to columns in the form of uniqueness requirements, relational integrity constraints to other tables/rows, allowable values and data types.For example, a column containing a product price should probably only accept positive values. But there is no standard data type that accepts only positive numbers. Another issue is that you might want to constrain column data with respect to other columns or rows. For example, in a table containing product information, there should be only one row for each product number.

Automated analysis of real-time data plays an increasingly important role in our society. Real-time or near real-time systems in a variety of domains demand the ability to extract meaning from potentially disparate events from a variety of sources.

SSJS Rocks! I'm a fan of Server Side JavaScript (SSJS) and databases (sure, that's an odd combination, but hey, this is a geek zone). In any case, here's a quick take on JavaScript and DB interaction using Jaxer.

This article talks about what is Object-Relational Mapping (ORM). It also talks about PHP ORM solutions that can make you more productive by allowing the development of your PHP database driven sites progress faster.

IWho comes up with this? A dummies for dummies book? In The Manga Guide to Databases, Tico the fairy teaches the Princess how to simplify her data management. We follow along as they design a relational database, understand the entity-relationship model, perform basic database operations

sqlmap is an automatic SQL injection tool developed in Python. Its goal is to detect and take advantage of SQL injection vulnerabilities on web applications. Once it detects one or more SQL injections on the target host, the user can choose among a variety of options to perform an extensive back-end database management system fingerprint, retrieve DBMS session user and database, enumerate users, password hashes, privileges, databases, dump entire or user's specific DBMS tables/columns, run his own SQL SELECT statement, read specific files on the file system and much more.

David Axmark, a cofounder and former lead engineer for MySQL, has resigned from Sun Microsystems a few weeks after another cofounder said he may also leave the company.

This article describes the usage of the Spring JDBC Template in a standalone application.

You may think that you don’t need a temporary table. But, if you’ve ever retrieved data from your database retrieved data from a table and put it in a list of some sort simply to process it further with your code, you need to learn about temporary tables.

In most cases your DAOs needs some search methods and most developers are usually creating numerous of methods to perform all types of different search, like findByName , findByNameAndEmail, findByUsername etc. Also these methods are usually have "twins" methods for counting results. Some smarter developers using "example" beans for searching. But you should be very careful because of the default values assigned to the bean properties. I don't like both approaches...

But the thing I noticed is, there’s just no avoiding the fact that whatever your domain POJO’s are that need to be persisted, chances are good that the use of Hibernate will impose some constraints on how you must write those POJO’s. I have two examples of this to share.

When you have a query or stored procedure that needs performance tuning, what are some of the first things you try?

A tutorial to create a newsletter application for your website. It allows users to subscribe and unsubscribe from the newsletter. A simple online administration interface (an ASP.NET page) allows the admin to create and send newsletters/emails.

So... your shiny MySQL database is no longer running and you want to fix it? You've come to the right place! I've assembled a list of 7 ways to fix your MySQL database when a simple restart doesn't do the trick, or when you have corrupt tables.

A parameterized query is a query in which placeholders are used for parameters and the parameter values are supplied at execution time. The most important reason to use parameterized queries is to avoid SQL injection attacks.

Capistrano tips from one of the few Capistrano masters.

Create high-performing SQL code as well as assist in troubleshooting existing queries that aren't providing the response times you'd like.

This post presents my current approach for dealing with text files using LINQ, and includes a function for splitting CSV lines.

While Java DB is Sun's distribution of Apache Derby, we do not maintain a separate users' forum for it outside of the Apache Derby users' forum. So, the best place to post your Java DB questions is still the Apache Derby users' alias: derby-user.

A short screencast introduction to NHibernate: In this episode we will talk about what does NHibernate bring to the table

Why study patterns from 4GL applications? Writing 4GL applications yields a lot of productivity clues that may be applicable to programming at large. This series of articles attempt to document practices that I have seen. If you plan to write a large application, I hope these notes help you to create base libraries that will help develop your application faster, and create more maintainable software, and help your end-users become more productive.

An article about an aproach to hibernate session handling in two tier applications.

This is a list of ten useful articles about database design which includes some tips and practical suggests to help you to design quickly databases for your web projects. The list includes some tips to define relationships-entities model, common database design mistakes, database normalization, how to use PHP and SQL to create tables and relationships and a correct approach to define relationships between tables.

Manik is looking for feedback on the new features and performance characteristics, including: performance under load, performance in large clusters, and backward compatibility against code written for JBC 2.x.

The two questions that I needed to solve were: 1. How do I store these collections of information? 2. How do I reference individual items in that collection from elsewhere in the game?