Question

I’ve got a small problem. I launch my application and after launching a query and comparing rs == null I get error ResultSet is closed.

Here is the code:

error_code = NO_ERROR;
    try
    {
        ArrayList <Harmonogram> al = new ArrayList <Harmonogram> ();
        ResultSet rs = stat.executeQuery(myQuery);
        if (rs == null)
        {
            return null;
        }else{
            Harmonogram harm = new Harmonogram(rs.getLong(1), rs.getInt(2), rs.getInt(3), rs.getInt(4), rs.getLong(5), rs.getString(6));

After this I get a SQLException telling me: ResultSet is closed.

Answer 1

You are using incorrect method of checking whether ResultSet has any data.

Instead of

if ( rs == null )
{
    return null;
}

use

if ( ! rs.next( ) )
{
    return null;
}