public int getMimeId(String mimeString) {
        return mimeBuffer.getId(mimeString);
    }
This is still in its early stages.  The idea is to
get something working with h2 and then add to that
as necessary.
<p>
Beware, this deletes the db file with each initialization.
<p>
Each thread must construct its own DBWriter because each
DBWriter creates its own PreparedStatements at initialization.
tika-eval/tika-eval-app/src/main/java/org/apache/tika/eval/app/io/DBWriter.java