How to query free text and how to efficiently process upper/lower case

Question

Hi friends,
I'm now have two questions need your helps.
1, i want to query free text base on oracle semantic, i tried create a Full Text Index on object like ‘CREATE INDEX di_obj_idx ON data_integration(to_char(triple.GET_OBJECT())) indextype is ctxsys.context’, but i got an error 'DRG-11304:function-based indexes are not supported by this indextype’. it seems that can't specified a column with functions. so any way for this?
2, base on some reasons, we need to query something ignores upper/lower. of course, we can use upper/lower functions, but the performance is very low. what my question is is there any functions can be used in SEM_MATCH table function or any way can give me the higher performance?
best regards,
steven
Sep 9,2009

Answer 1

Hope this helps
import java.io.*;
public class Copy {
public static void main(String[] args) throws IOException {
File inputFile = new File("farrago.txt");
File outputFile = new File("outagain.txt");
FileReader in = new FileReader(inputFile);
FileWriter out = new FileWriter(outputFile);
BufferedReader buff = new BufferedReader(in);
String c;
while ((c = buff.readLine()) != null)
out.write(c.toUpperCase());
in.close();
out.close();
}