public function FetchByIndex
Prototype:
public function FetchByIndex(index)
Parameters
	
		
			index
		
		
			the index of the desired row
		
	 
 
Description:
Fetches a row by its index.
Warning: Not all databases support this operation. Check 
First and 
Next which are supported by any driver.
 
Return value:
Returns 0 is index is invalid; non-zero if index is valid.