connection = connector.getConnection();
        query = connection.prepareStatement(INSERT INTO document_s (document_id, document_name, document_type, creation_date, parent_id) VALUES(?,?,?,?,?), Statement.RETURN_GENERATED_KEYS);
        query.setNull(1, Types.INTEGER);
        query.setString(2, docid.getDoc_name());
        query.setString(3, docid.getDoc_type());
        query.setString(4, docid.getCreation_date());
        query.setInt(5, docid.getParent_id());

        query.executeUpdate();
        resultSet = query.getGeneratedKeys();
        resultSet.next();
        int key = resultSet.getInt(1);
        query1 = connection.prepareStatement(INSERT INTO document_r(index, document_id, authors, keywords) VALUES(?,?,?,?));
        query1.setNull(1, Types.INTEGER);
        query1.setInt(2, key);
        query1.setString(3, docid.getAuthors());
        query1.setString(4, docid.getKeywords());
        query1.executeUpdate();
        return 0;
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        connector.close1(connection, query, resultSet);
    }
    return 0;

for (String retval: s.split(" ")) {
  query1.setString(1, retval);
  query1.executeUpdate();
  }

String[] authors = docid.getAuthors().split(" ");
String[] keywords = docid.getKeywords().split(" ");
int minLen = Math.min(authors.length, keywords.length);

for (int i = 0; i < minLen; i++) {
  query1.setString(3, authors[i]);
  query1.setString(4, keyword[i]);
  query1.executeUpdate();
}

query1.setNull(3, Types.STRING);
for (int i = minLen; i < keywords.length; i++) {
  query1.setString(4, keyword[i]);
  query1.executeUpdate();
}

query1.setNull(4, Types.STRING);
for (int i = minLen; i < authors.length; i++) {
  query1.setString(3, authors[i]);
  query1.executeUpdate();
}

String[] autors = docid.getAuthors().split( " " );
String[] keywords = docid.getKeywords().split( " " );
for ( int i = 0; i < Math.max( autors.length, keywords.lenght ); i++ ) {
   query.setInt( 1, i+1 );
//?   query.setTimestamp( 2, date );
   if ( i >= autors.length ) {
       query.setNull( 3, Types./*N*/VARCHAR );
   } else {
       query.setString( 3, autors[i] );
   }
   if ( i >= keywords.length ) {
       query.setNull( 4, Types./*N*/VARCHAR );
   } else {
       query.setString( 4, keywords[i] );
   }
   query.executeUpdate();
}