sql4o was written by Travis Reeder and provides an SQL interface to the db4o object datastore.
'org.datanucleus:sql4o:2.0.0-release'
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>sql4o</artifactId>
<version>2.0.0-release</version>
</dependency>
<dependency org="org.datanucleus" name="sql4o" rev="2.0.0-release"/>
"org.datanucleus", "sql4o", "2.0.0-release"