Querying an SQL database

Usually data is more often read than it is written, and performing data queries is the most important task done by database-driven applications. The standard JDBC API is rather verbose and adds a lot of boilerplate code around actual queries. Groovy provides more elegance to the querying code by simplifying access and mapping logic.

This recipe contains a highlight of some of the methods you can use to query a database using Groovy.

Getting ready

As for the previous recipes from this chapter, we will use the DBUtil class defined in the Creating a database table recipe as well as the same database structure.

Considering that this recipe is about querying data, we need to populate our database first. The database population code is quite verbose, so we leave it out of this recipe and we ask the reader to refer to the accompanying code for this chapter. The DBUtil.groovy available in the download section has been refactored with two new methods:

• createSchema: It triggers...