You could also just keep a "special" document in your index with a known ID that contains meta-data fields. If this document had no fields in common with any other document it wouldn't satisfy searches (except the *:* search).
Or you could store this info somewhere else (file, DB, etc). Or you can commit with "user data", although this isn't exposed through Solr yet, see: https://issues.apache.org/jira/browse/SOLR-2701 Best Erick On Thu, Jul 12, 2012 at 5:22 AM, <karsten-s...@gmx.de> wrote: > Hi Avenka, > > you asked for a HowTo to add a field "inverseID" which allows to calculate > max(id) from its first term: > If you do not use solr you have to calculate "100000000 - id" and store it in > an extra field "inverseID". > If you fill solr with your own code, add a TrieLongField "inverseID" and fill > with the value "-id". > If you only want to change schema.xml (and add some classes): > * You need a new FieldType "inverseLongType" and a Field "inverseID" of > Type "inverseLongType" > * You need a line <copyField source="id" dest="inverseID"/> > (see http://wiki.apache.org/solr/SchemaXml#Copy_Fields) > > For inverseLongType I see two possibilities > a) use TextField and make your own filter to calculate "100000000 - id" > b) extends TrieLongField to a new FieldType "InverseTrieLongField" with: > @Override > public String readableToIndexed(String val) { > return super.readableToIndexed(Long.toString( -Long.parseLong(val))); > } > @Override > public Fieldable createField(SchemaField field, String externalVal, float > boost) { > return super.createField(field,Long.toString( -Long.parseLong(val)), > boost ); > } > @Override > public Object toObject(Fieldable f) { > Object result = super.toObject(f); > if(result instanceof Long){ > return new Long( -((Long)result).longValue()); > } > return result; > } > > Beste regards > Karsten > > View this message in context: > http://lucene.472066.n3.nabble.com/DataImport-using-last-indexed-id-or-getting-max-id-quickly-tp3993763p3994560.html > > > -------- Original-Nachricht -------- >> Datum: Wed, 11 Jul 2012 20:59:10 -0700 (PDT) >> Von: avenka <ave...@gmail.com> >> An: solr-user@lucene.apache.org >> Betreff: Re: DataImport using last_indexed_id or getting max(id) quickly > >> Thanks. Can you explain more the first TermsComponent option to obtain >> max(id)? Do I have to modify schema.xml to add a new field? How exactly do >> I >> query for the lowest value of "100000000 - id"? >> >> -- >> View this message in context: >> http://lucene.472066.n3.nabble.com/DataImport-using-last-indexed-id-or-getting-max-id-quickly-tp3993763p3994560.html >> Sent from the Solr - User mailing list archive at Nabble.com.
