mysql 1064异常原因及解决方法

if(!$handle= @fopen($fname, "r")) {echo "open $fname failed\n";exit;};  
	$str="";$count=0;
	$ins="INSERT INTO pydot_g (id, aauthor) VALUES";
    while(($buf=fgets($handle, 1000)) !== false){
            list($id,$field) = explode("#",$buf);
			$str .= sprintf('(%d,'%s'),',$id,$field);
			$count++;
	}    
	$str.="(3955,'3955')";
	$dup="ON DUPLICATE KEY UPDATE aauthor=VALUES(aauthor);";
	$sql=$ins.$str.$dup;
	//echo $sql."\n";
	if(!mysql_query($sql)) 
	{echo "mysql failed\n";
	echo mysql_errno() . ": " . mysql_error() . "\n";}
	
	fclose($handle);
	mysql_close($link);

1320#CarryDream Int'l Co., Ltd.
1321#ES APP Group
1322#app4uu