The execution of this plugin's mojo can be bound to a phase of build lifecycle. Use the dependencies in plugin to specify the artifact that has your JDBC driver.
<project>
[...]
<build>
[...]
<plugins>
[...]
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>dbunit-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<!--jar file that has the jdbc driver -->
<dependencies>
<dependency>
<groupId></groupId>
<artifactId></artifactId>
<version></version>
</dependency>
</dependencies>
<!-- common configurations -->
<configuration>
<driver></driver>
<url></url>
<username></username>
<password><password>
[....]
</configuration>
</executions>
<execution>
<phase></phase>
<goals>
<goal></goal>
</goals>
<!-- specific configurations -->
<configuration>
[...]
</configuration>
</execution>
<execution>
<phase></phase>
<goals>
<goal></goal>
</goals>
<!-- specific configurations -->
<configuration>
[...]
</configuration>
</execution>
[...]
</executions>
[...]
</plugin>
[...]
</plugins>
[...]
</build>
[...]
</project>