Is there any way to delete the index of only one row in solr using solrj - solrj

Question

I have made a java apllication which can index my last row (which is what I wabt)
But now I ask Is there any wa yo deete the index of this role! Can you give me directions how to do that or maybe simple code to change my code?
;
public class indexSolr {
private Connection conn = null;
private static HttpSolrServer server;
private Collection docs = new ArrayList();
private int _totalSql = 0;
private long _start = System.currentTimeMillis();
public static void main(String[] args) throws SolrServerException, IOException, SQLException
{ String url = "http://localhost:8983/solr/db";
indexSolr idxer = new indexSolr(url);
idxer.doSqlDocuments();
idxer.endIndexing();
}
private void doSqlDocuments() throws SQLException {
try {
Class.forName("org.postgresql.Driver");
conn = DriverManager.getConnection(
"jdbc:postgresql://localhost:5432/biz_cat",
"postgres", "pos");
java.sql.Statement st = null;
st = conn.createStatement();
ResultSet rs = st.executeQuery("select * from pl_biz order by id DESC LIMIT 1");
while (rs.next()) {
SolrInputDocument doc = new SolrInputDocument();
Integer id = rs.getInt("id");
String name = rs.getString("name");
String midname = rs.getString("midname");
String lastname = rs.getString("lastname");
String frlsname = rs.getString("frlsname");
String biz_subject = rs.getString("biz_subject");
String company_type = rs.getString("company_type");
String obshtina = rs.getString("obshtina");
String main_office_town = rs.getString("main_office_town");
String address = rs.getString("address");
String role = rs.getString("role");
String country = rs.getString("country");
String nace_code = rs.getString("nace_code");
String nace_text = rs.getString("nace_text");
String zip_code = rs.getString("zip_code");
String phone = rs.getString("phone");
String fax = rs.getString("fax");
String email = rs.getString("email");
String web = rs.getString("web");
String location = rs.getString("location");
String geohash = rs.getString("geohash");
Integer popularity = rs.getInt("popularity");
doc.addField("id", id);
doc.addField("name", name);
doc.addField("midname", midname);
doc.addField("lastname", lastname);
doc.addField("frlsname", frlsname);
doc.addField("biz_subject", biz_subject);
doc.addField("company_type", company_type);
doc.addField("obshtina", obshtina);
doc.addField("main_office_town", main_office_town);
doc.addField("address", address);
doc.addField("role", role);
doc.addField("country", country);
doc.addField("nace_code", nace_code);
doc.addField("nace_text", nace_text);
doc.addField("zip_code", zip_code);
doc.addField("phone", phone);
doc.addField("fax", fax);
doc.addField("email", email);
doc.addField("web", web);
doc.addField("location", location);
doc.addField("geohash", geohash);
doc.addField("popularity", popularity);
docs.add(doc);
++_totalSql;
if (docs.size() > 1) {
// Commit within 5 minutes.
UpdateResponse resp = server.add(docs);
System.out.println (resp);
if (resp.getStatus() != 0) {
log("Some horrible error has occurred, status is: " +
resp.getStatus());
}
docs.clear();
}
}
}
catch (Exception ex)
{
ex.printStackTrace();
}
finally {
if (conn != null) {
conn.close();
}
}
}
private void endIndexing() throws IOException, SolrServerException {
if (docs.size() > 0) { // Are there any documents left over?
server.add(docs, 300000); // Commit within 5 minutes
}
try
{
server.commit();
}
catch (Exception ex)
{
ex.printStackTrace();
}
long endTime = System.currentTimeMillis();
log("Total Time Taken: " + (endTime - _start) +
" milliseconds to index " + _totalSql +
" SQL rows" );
}
private indexSolr(String url) throws IOException, SolrServerException {
// Create a multi-threaded communications channel to the Solr server.
try {
server = new HttpSolrServer(url);
server.setSoTimeout(1000); // socket read timeout
server.setConnectionTimeout(1000);
server.setMaxRetries(1);
}
catch (Exception ex)
{
ex.printStackTrace();
}
}
}

Answer 1

That's all you need to do to delete the index of a row with id for example 30682 from solr
SolrServer solrServer;
String url = "http://localhost:8983/solr/db";
solrServer = new HttpSolrServer(url);
solrServer.deleteByQuery("id:30682");
solrServer.commit();
System.out.println("index deleted");
I Hope it helps someone