postgresql

Scala JDBC FAQ: How can I use the Java JDBC API in my Scala application?

If you want to use a SQL database with your Scala applications, it's good to know you can still use the traditional Java JDBC programming library to access databases. I just ran a simple JDBC connection and SQL SELECT test, and everything seems to work just as it does in Java.

Here's a quick demonstration of how to create a Tomcat connection pool (database connection pool) using the Tomcat DBCP library.

I'm not going to go into a detailed explanation here of how Tomcat DBCP works, other than to say that it works for me, and I've tried to include everything here that you'll need to implement your own Tomcat DBCP database connection pool in your web applications.

In need of a Java JDBC driver for your database? I thought I'd put together a quick list here showing the URLs where you can download the latest JDBC drivers for databases like Postgresql (Postgres), MySQL, and Microsoft SQL Server.

MySQL JDBC driver

MySQL Connector/J is the official MySQL JDBC driver. Here's a link to their JDBC driver: 

Wow, it had been a long time since I last started Postgres on my Mac computer (a MacBook Pro, to be specific), and it took almost almost 20 minutes to remember how to do it. So, to keep that from happening again, here's a quick tip on how to start Postgres (Postgresql) on a Mac OS X computer.

Okay, maybe this is lame, but when I've been away from writing SQL database queries for a while I can never remember how to search for database table fields that are either NULL, or NOT NULL. I always try to use the = operator or something else.

So, for you Al, here's how to perform a SQL query and find all records where a field in a database table is NULL:

SELECT * FROM foo WHERE bar IS NULL;

And here's how to perform a SQL query showing all records in a database table where a field is NOT NULL: