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The Simple Persist Module

This module defines two very simple Data Access Objects (DAOs). A DAO is an object that provides an interface for persistence operations. In an application that makes use of an Object-Relational Mapping (ORM) framework such as Hibernate, DAOs are usually defined around objects. In this project, we are defining two DAO objects: WeatherDAO and LocationDAO. The WeatherDAO class allows us to save a Weather object to a database and retrieve a Weather object by id, and to retrieve Weather objects that match a specific Location. The LocationDAO has a method that allows us to retrieve a Location object by zip code. First, let’s take a look at the simple-persist POM in Example 7-8.

Example 7-8. simple-persist POM

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.sonatype.mavenbook.ch07</groupId> <artifactId>simple-parent</artifactId> <version>1.0</version> </parent> <artifactId>simple-persist</artifactId> <packaging>jar</packaging> <name>Simple Persistence API</name> <dependencies> <dependency> <groupId>org.sonatype.mavenbook.ch07</groupId> <artifactId>simple-model</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate</artifactId> <version>3.2.5.ga</version> <exclusions> <exclusion> <groupId>javax.transaction</groupId> ...

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