Question

I’m fairly new to Java and I was wondering how I could get all of the columns of a returned via MySQL query. For instance,

SELECT * FROM `login`

And then I had this code to return the results:

        while (rs.next()) {
            for (byte i = 1; i < 10; i++) {
                result = result+" "+rs.getString(i);
            }
        }

I want 10 in the for loop to be the maximum number of columns because of dynamic MySQL queries. Is there a simple way to do this? Thanks.

Answer 1

Although, as duffymo suggested, it’s better to spell out the columns you want to receive in the query, you can use ResultSet metadata to fetch the number of columns returned:

 ResultSetMetaData rsmd = rs.getMetaData();
 int numberOfColumns =rsmd.getColumnCount();

 while (rs.next()) {
      for (byte i = 1; i <= numberOfColumns; i++) {
           result = result+" "+rs.getString(i);
      }
 }