https://hadoop.apache.org/docs/r1.2.1/api/org/apache/hadoop/mapred/lib/db/DBWritable.html
DBWritable (Hadoop 1.2.1 API)
hadoopapi
https://hadoop.apache.org/docs/r2.6.4/api/org/apache/hadoop/mapred/lib/db/class-use/DBWritable.html
Uses of Interface org.apache.hadoop.mapred.lib.db.DBWritable (Apache Hadoop Main 2.6.4 API)