Set count of column in database......

Question

hi All,
i just wanna to ask, it is possible that i can set count of column depends on data/input.
for example;
in common, when 2 column, code sql like:
String query3 = "INSERT INTO Sheet5(Rule, Weight)" + "VALUES ('"+ finalRule+"', '"+weight+"')";but if n column, how?
anybody knows or give me some idea to handle that..
thanks.

Answer 1

what do you means by using preparedStatement?
is it like this
String sql1 = "SELECT empno FRom emp WHERE empno = ?";
String sql2 = "INSERT INTO emp VALUES (?,?,?,?,?,?,?,?)";
PreparedStatement pstmt1 = conn.prepareStatement(sql1);
PreparedStatement pstmt2 = conn.prepareStatement(sql2);
pstmt1.setInt(1, 9999);
ResultSet rset = pstmt1.executeQuery();
     if(rset.next()){
          System.out.println("The employee");
           rset.close();
     else {
                     pstmt2.setInt(1, 99990);
     pstmt2.setString(2, "CHARLIE");
     pstmt2.setString(3, "ANALYST");
     pstmt2.setInt(4, 7566);
     pstmt2.setString(5, "01-jan-01");
     pstmt2.setFloat(6, 12000);
     pstmt2.setFloat(7, (float)10.5);
     pstmt2.setInt(8, 10);
     pstmt2.executeUpdate();
     }so, i still need to write 8 times '?' for 8 column.
but how if i don't know count of column?