ResultSet: Exception: set type is TYPE_FORWARD_ONLY — why?

Question

I have very simple code:

pstat=con.prepareStatement(\"select typeid from users where username=? and password=?\");             
pstat.setString(1, username);         


        

Answer 1

java.sql.SQLException: Result set type is TYPE_FORWARD_ONLY

with JDBC 2.0 API, the user has the flexibility to move the cursor either forward or backward.

Your error can be removed by creating the statemnt as follows

Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);

Also, a better way to count the number of rows would be

rs=pstat.executeQuery();                //execute the query
rs.last();                              //move the cursor to the last row
int numberOfRows = rs.getRow();         //get the number of rows
rs.beforeFirst();                       //back to initial state