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    copied!<p>I assume you only have one database active at a time. If this is a valid assumption, you don't really need a loop, instead you need to be able to switch between databases.</p> <p>You can achieve this by declaring the DB-specific properties in profiles, then activate the relevant profile.</p> <p>The configuration below shows how to set profiles for the 3 databases you mention, and use a default in case none is specified. You can omit the default and the build will then fail unless a profile is declared. </p> <p>You'd activate each profile from the command line as follows:</p> <pre><code>mvn test -P h2 mvn test -P mysql mvn test -P postgresql &lt;profiles&gt; &lt;profile&gt; &lt;id&gt;h2&lt;/id&gt; &lt;properties&gt; &lt;db.groupId&gt;com.h2database&lt;/db.groupId&gt; &lt;db.artifactId&gt;h2&lt;/db.artifactId&gt; &lt;db.version&gt;1.1.117&lt;/db.version&gt; &lt;/properties&gt; &lt;/profile&gt; &lt;profile&gt; &lt;id&gt;mysql&lt;/id&gt; &lt;properties&gt; &lt;db.groupId&gt;mysql&lt;/db.groupId&gt; &lt;db.artifactId&gt;mysql-connector-java&lt;/db.artifactId&gt; &lt;db.version&gt;5.1.6&lt;/db.version&gt; &lt;/properties&gt; &lt;/profile&gt; &lt;profile&gt; &lt;id&gt;postgresql&lt;/id&gt; &lt;properties&gt; &lt;db.groupId&gt;postgresql&lt;/db.groupId&gt; &lt;db.artifactId&gt;postgresql&lt;/db.artifactId&gt; &lt;db.version&gt;8.3-603.jdbc4&lt;/db.version&gt; &lt;/properties&gt; &lt;/profile&gt; &lt;/profiles&gt; ... &lt;!--default database, say mysql--&gt; &lt;properties&gt; &lt;db.groupId&gt;mysql&lt;/db.groupId&gt; &lt;db.artifactId&gt;mysql-connector-java&lt;/db.artifactId&gt; &lt;db.version&gt;5.1.6&lt;/db.version&gt; &lt;/properties&gt; </code></pre> <p>You can activate a profile based on the value of an environment variable, for example the configuration below activates the h2 profile if the ACTIVE_DB environment variable is set to "h2".</p> <pre><code> &lt;profile&gt; &lt;id&gt;h2&lt;/id&gt; &lt;activation&gt; &lt;property&gt; &lt;name&gt;ACTIVE_DB&lt;/name&gt; &lt;value&gt;h2&lt;/value&gt; &lt;/property&gt; &lt;/activation&gt; &lt;properties&gt; &lt;db.groupId&gt;com.h2database&lt;/db.groupId&gt; &lt;db.artifactId&gt;h2&lt;/db.artifactId&gt; &lt;db.version&gt;1.1.117&lt;/db.version&gt; &lt;/properties&gt; &lt;/profile&gt; </code></pre>
 

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