Question

import java.net.URL;
import java.net.URLConnection;
import java.sql.*;
public class searchlink{
public static void main(String args[]) throws Exception {
    //String link="http://hosted.ap.org";
    Connection con=null;
    Statement stmt=null;
    Statement stmtR=null;
    if(con==null){
            SQLConnection.setURL("jdbc:sqlserver://192.168.2.53\\SQL2005;user=sa;password=365media;DatabaseName=LN_ADWEEK");
            con=SQLConnection.getNewConnection();
            stmt=con.createStatement();
            stmtR=con.createStatement();
    }
    ResultSet rs;
    rs=stmt.executeQuery("select url from urls where url='http://www.topix.com/rty/elyria-oh'");
    while(rs.next()){
    String mem=rs.getString(1);
    System.out.println("Result is "+mem);}
}
}

The above program prints the output if the query returns a row.
If the query does not return any, the program stops without printing anything.

Instead of it getting stopped without printing anything, I want the program to identify that the query has returned nothing and print the output saying something like this ” There is nothing returned after SQL query execution “.

How to identify using some method or variable that the query has been executed without returning any row?

Answer 1

boolean hasRows = false;
while(rs.next()){
  hasRows = true;
  // do other stuff required.
}

if(!hasRows)
{
  // do stuff when no rows present.
}

— or —

if(!rs.next())
{
  // do stuff when no rows prsent.
}
else
{
  do{
  // do stuff required
  }while(rs.next());
}

keeping in mind that the check if(!rs.next()) will advance the cursor in the result set. Don’t advance it again before you get the values.