说明
object 
db2_fetch_object ( resource stmt [, int row_number] )
   Returns an object in which each property represents a column returned in
   the row fetched from a result set.
  
返回值
   Returns an object representing a single row in the result set. The
   properties of the object map to the names of the columns in the result set.
  
   The IBM DB2, Cloudscape, and Apache Derby database servers typically fold
   column names to upper-case, so the object properties will reflect that case. 
  
   If your SELECT statement calls a scalar function to modify the value
   of a column, the database servers return the column number as the name of
   the column in the result set. If you prefer a more descriptive column name
   and object property, you can use the AS clause to assign a name to the
   column in the result set.
  
   Returns FALSE if no row was retrieved.