Row Not form ExecuteQurey

Question

Statement sql = con.createStatement();
ResultSet rs = sql.executeQuery("select * from emp);
How do you know if the executeQuery has returned any rows ? How do you test for row not found.
thanks

Answer 1

Therefore normally processing is done this way.
boolean haveResults = false;
while(rs.next()) {
  haveResults = true;
  // do your thing
If (!haveResults) {
  // no records were returned
}But you could do the following if the resultset is not forward only.
if(!rs.next()) {
  // no records were returned
else {
rs.beforeFirst() //move back to before first row
while(rs.next()){
  // do your thing
}or again if the resultset is not forward only.
int rowCount = (rs.last() ? rs.getRow() : 0);
rs.beforeFirst() //move back to before first row
if (rowCount == 0) {
  // no records were returned
else {
  while(rs.next()){
    // do your thing