method:getColumnCount ( )
return type:int
content:ใช้คืนค่า จำนวน column ทั้งหมด ของ ResultSet
example:Class.forName ( "sun.jdbc.odbc.JdbcOdbcDriver" );
Connection conn = DriverManager.getConnection ( "jdbc:odbc:Nutt" );
Statement stat = conn.createStatement ( ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY );
String sql = "SELECT firstname, lastname, sex FROM person";
Result rs = stat.executeQuery ( sql );
ResultSetMetadata rsmd = rs.getMetaData ( );
int numCol = rsmd.getColumnCount ( );
