Re: PHP-Lucene Integration

[[EMAIL PROTECTED]]

Howdy,
For starters, compile and install the java bridge (and if necessary 
recompile PHP and Apache2) and make sure it works (there's a test php 
file supplied).

Then, here's a simplified part of my code, just to give you an example 
how it works. This is the part that does the searching, indexing is done 
in a similar way.

PHP:
...some code here for HTML page setup etc...
$lucene_dir = $GLOBALS["lucene_dir"];
java_set_library_path("/path/to/your/custom/lucene-classes.jar");
$obj = new Java("searcher"); // searcher is the custom written class 
that does actual searching and data output
$writer = new Java("java.io.StringWriter");
$obj->setWriter($writer);
$obj->initSearch($lucene_dir);
$obj->getQuery($query); // $query is the user supplied query from the 
HTML form, not visible here

// get the last exception
$e = java_last_exception_get();
if ($e) {
   // print error
   echo $e->toString();
} else {
   echo $writer->toString();
   $writer->flush();
   $writer->close();
}
java_last_exception_get();
// clear the exception
java_last_exception_clear();
---------------------------------
JAVA (custom written class located in the 
/path/to/your/custom/lucene-classes.jar):

import ...whatever is needed here for the class...
public class searcher {
  IndexReader reader     = null;
  IndexSearcher s        = null;          //the searcher used to 
open/search the index
  Query q                = null;          //the Query created by the 
QueryParser
  BooleanQuery query  = new BooleanQuery();
  Hits hits              = null;          //the search results
  
  public Writer out;

  public void setWriter(Writer out) {
               this.out=out;
  }
 public void initSearch(String indexName) throws Exception {
       try {
               File indexFile            = new File(indexName);
               Directory activeDir       = 
FSDirectory.getDirectory(indexFile, false);
               if(reader.isLocked(activeDir)) {
                       //out.write("Lucene index is locked, waiting 5 
sec.");
                       Thread.sleep(5000);
               }
               reader = IndexReader.open(indexName);
               s = new IndexSearcher(reader);
               //out.write("Index opened");
       } catch (Exception e) {
               throw new Exception(e.getMessage());
       }
  }

  public void getQuery(String queryString) throws Exception {
       int totalhits   = 0;
       Analyzer analyzer = new StandardAnalyzer();
      
       String[] queryFields = 
{"field1","field2","field3","field4","field5};
       float[] boostFields = {10, 6, 2, 1, 1};

       try {
               for ( int i = 0; i < queryFields.length; i++)
               {
               q = QueryParser.parse(queryString, queryFields[i], 
analyzer);
               if (boostFields[i] > 1)
                       q.setBoost(boostFields[i]);
               query.add(q, false, false);
               }
       } catch (ParseException e) {
               throw new Exception(e.getMessage());
       }

       try {
               hits = s.search(query);
       } catch (Exception e) {
               throw new Exception(e.getMessage());
       }
      
       totalhits = hits.length();

       if (totalhits == 0) {                             // if we find 
no hits, tell the user
               out.write("<br>I'm sorry I couldn't find your query: " + 
queryString);
       } else {

       for (int i = 0; i < totalhits; i++) {
           Document doc = hits.doc(i);
           String field1 = doc.get("field1");
           String field2 = doc.get("field2");
           String field3 = doc.get("field3");
           String field4 = doc.get("field4");
           String field5 = doc.get("field5");
           out.write("Field1: " + field1 + ", Field2: " + field2 + ", 
Field3: " + field3 + ", Field4: " + field4 + ", Field5: " + field5 + 
"<br>");
       }
 }
}


Sanyi said the following on 2/7/2005 3:54 AM:
Hi!
Can you please explain how did you implement the java and php part to let them 
communicate through
this bridge?
The brige's project summary talks about "java "application-server" or a dedicated 
java process"
and I'm not into Java that much.
Currenty I'm using a self-written command-line search program and it outputs 
its results to the
standard output.
I guess your solution must be better ;)
If the "communication parts" of your code aren't top secret, can you please 
share them with me/us?
Regards,
Sanyi

		
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