how to update data in XML file with SAX?

wompgx

I use SAX open and parse an exist XML file.

how to append node in the XML file with SAX?

and how to update the data in startElementHandler and characterDataHandler?

of course. At last, the XML file should be saved.

Thanks a lot.

daveyboy

AFAIK, sax is read only. you can't directly update a file through its api. the simple way is for your parser to regenerate the file as is as it parses it, only changing/adding the relevant data. you would then overwrite the original file with the new one.

wompgx

if do like this,it seemed the speed will be slowly.

daveyboy

you're going to have to parse the file anyway, unless you can get away with a regular expression, so it comes back down to the SAX/DOM argument.

i would say SAX is quicker here, because you don't need to parse and store the whole document - you can write it straight back out.

i would like to know why you are using XML as a data format. i used it myself for a couple of years, but using MySQL is 15 times quicker and 5 times easier for the programmer. you can always export XML from MySQL.