net.ontopia.topicmaps.query.spi
Class RDBMSSearcher

java.lang.Object
  net.ontopia.topicmaps.query.spi.AbstractSearcher
      net.ontopia.topicmaps.query.spi.RDBMSSearcher

All Implemented Interfaces:

SearcherIF

public class RDBMSSearcher
extends AbstractSearcher

EXPERIMENTAL: RDBMS searcher implementation that executes a SQL query in the same database as the topic map is stored in. The query must return two columns, the first the object id of the result topic map object (a string), the second the score (a float).

The name of the predicate is used as the key to look up the query itself. The queries are read from a properties file called RDBMSSearcher.props from the CLASSPATH.

The sql query can be specified directly via the 'sql' URI parameter on the searcher class. Just make sure that the query is URI encoded. The query file name can be overriden with the 'queryFile' parameter.

Field Summary

Fields inherited from class net.ontopia.topicmaps.query.spi.AbstractSearcher

moduleURI, parameters, predicateName, topicmap

Fields inherited from interface net.ontopia.topicmaps.query.spi.SearcherIF

ITEM_IDENTIFIER, OBJECT_ID, OBJECT_VALUE, OCCURRENCE_URI, STRING_VALUE, SUBJECT_IDENTIFIER, SUBJECT_LOCATOR

Constructor Summary

RDBMSSearcher()
PUBLIC: The mandatory default constructor.

Method Summary

SearchResultIF	getResult(java.lang.String query) PUBLIC: Returns the String value of the field.
int	getValueType() PUBLIC: Returns type of values returned by the search result.

Methods inherited from class net.ontopia.topicmaps.query.spi.AbstractSearcher

setModuleURI, setParameters, setPredicateName, setTopicMap

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RDBMSSearcher

public RDBMSSearcher()

PUBLIC: The mandatory default constructor.

Method Detail

getValueType

public int getValueType()

Description copied from interface: SearcherIF

PUBLIC: Returns type of values returned by the search result. See constants declared in this class.

getResult

public SearchResultIF getResult(java.lang.String query)

Description copied from interface: SearcherIF

PUBLIC: Returns the String value of the field. Note that null is returned if the field has a reader set.