Ian Cutts’ transcript from Chris Wallace taught class 5/10/7 started 22:45 finished 11:30
I am afraid that you'll have to have the notes for this to make any sense at all..
Background Questionnaire :
B)
Get familiar with basics of CSS
Use the class tag
This will individualise your own CSS its CSS’s power!
C)
Protocol host path file port (because it has parameters it indicates the presence of a script)
Classic call to web functions or procedure call
Passing some data to that procedure governed by the parameters set in the url line
Simplest way of making one application or browser get something done
The guts of the web is about passing data
Flat files
By using this structure you can make your program available to anyone in the world! The crux of the web
D)
XML describing
The difference between a tag like subject and the content like nose
The vocabulary is different (unique) – chris created when producing semantic dictionary
Take medical dictionary what is the nose?
The respritory system is composed of the nose
The elemental relationship between different members
XML is a tree structure
But if you draw it out it is a network
Represent graphs
RDF
There must be a set of rules which you make up otherwise someone else could use it
E)
When you develop systems you use get then you can replace with post
Get is debuggable
Post is not saveable suppose you wanted to do the same computation all the time you can save the url! Or bookmark or send it to someone else – it becomes a reusable resource – it could be a button
Post is bad for development and reuse – you can mix post and get
You can bypass the limitations of the form with GET
Currency codes are standard ISO – don’t use sterling internally
The web works with standard codes – and identifiers
If you tell me the currency is in GBP you have used a good standard identifier
Currency rates change in the backend
Lookups to tables happens in the backend
Inside convert.php rates are all to USD as that is a common so to transfer from one obscure currency to another is done by going via USD which keeps the combinations down
H)
Factorial script
Javascript enables you to read and write the current document displayed
Document.data.value.limit is a long way down the tree
Document.write writes out into the current document
Recursion states the next value as some function of the previous version
Factorial 7 = factorial 6 *7
I)
Tricky SQL statement
Trying to convert from one currency and any other
You don’t want to hold all the different rates for 10currencies and 10 rates
What you might do is to use base currencies
There is no traffic over obscure currencies
There is only one table with two different views (aliases)
We want to view the table for both conversions
Different pointers to the table
One is from and the other is to
They point to the same table
It gives two lookups on the same table – it is like a join.
The crux is that you can use a table twice – tricky SQL
The more SQL you know the better!
The world is full of relational databases
SWT
Using socks and http proxy
Concentrate on keeping it local!
GETURLInfo is different program
HEAD is an HTTP method that gets the header
You want to look ahead rather than getting the document
To get the media type
If it’s a particular type of document you might not want to get
To get out through the proxy there is a setting in the compiler
Socket should enable you to set the proxy
Not done in java but has done in php
Low level socket programming
Socket layer to parse proxy addresses
It’s a frequent task
If your going to do any server programming then you need to bypass the firewall
Not being able to do it outside is useless
