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content/notes/10-routes-controllers.md

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+---
+title: "10-routes-controllers"
+aliases: 
+tags: 
+- cosc203
+- lecture
+---
+
+[slides](https://blackboard.otago.ac.nz/bbcswebdav/pid-2971203-dt-content-rid-19033355_1/courses/COSC203_S2DNI_2022/COSC203_lecture10%281%29.pdf)
+
+# Routes and controllers
+## MVC model
+- design pattern
+- used in ios development
+
+routes - foward requests to appropriate controller functions
+controller functions - get data from models, create html, display data, and return to view
+views (templates) - used by controllers to render data
+
+## Routes
+ - a section of express code that assocaites an HTTP verb, and url path, and a function to handle that pattern
+ - route is a middleware created by `var router = express.Router();`
+
+### route path
+- define endpoints at which requests can be made
+- can be string patterns similar to regex
+
+## route parameters
+- named url segments used to capture values at specific positions in the url
+- e.g., `/:user/`
+- captures values are stored in `req.params` object
+- names must be made up of "word characters"
+
+## route functions
+- express middleware — must respond to or call another function in the chain
+- each functionis added to the middleware chain and is executed in order
+
+## middleware
+- objects that have access to req, res, and the next middleware function in the req-res cycle
+- e.g.,
+```
+app.use()
+app.METHOD()
+router.use()
+express.static
+express.json
+express.urlencoded
+app.use(cookieParser())
+```
+
+- middleware can
+	- execute code
+	- change the req and response objects
+	- end the req-res cycle
+	- call next middleware function in stack
+
+![](https://i.imgur.com/H1BXggu.png)

content/notes/10-web-db-networks.md

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----
-title: "10-web-db-networks"
-aliases: 
-tags: 
-- cosc203
-- lecture
----
-
-[slides](https://blackboard.otago.ac.nz/bbcswebdav/pid-2971203-dt-content-rid-19033355_1/courses/COSC203_S2DNI_2022/COSC203_lecture10%281%29.pdf)