WebFund 2014W Lecture 13: Difference between revisions
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The video from the lecture given on February 28, 2014 is available: | |||
* [http://www.screencast.com/t/PBuN6voQ7mw Small from screencast.com] | |||
* [http://www.screencast.com/t/vgmtsqJV6 Large from screencast.com] | |||
* [http://dl.cuol.ca/capture/Anil.Somayaji/COMP_2406_2014W_Lecture_13_-_20140301_010241_27.mp4 Original from CUOL] | |||
==MongoDB== | ==MongoDB== | ||
| Line 25: | Line 31: | ||
* retrieve value of a property | * retrieve value of a property | ||
* => key/value store or associative array | * => key/value store or associative array | ||
Transactions: (not in MongoDB) | |||
* start a transaction | |||
* specify queries to match documents/records | |||
* specify changes to those documents/records | |||
* commit changes if none of the specified data has been changed by others | |||
* if others have changed documents/records, abort transactions and undo all changes | |||
* Airline example: reserve seat and record payment | |||
* If you want transactions, use SQL (e.g., PostgreSQL, Oracle, MySQL (sort of)), at the price of some performance | |||
==Ethics== | ==Ethics== | ||
==client-side JS== | ==client-side JS== | ||
Key difference between client-side and server-side JS: THE DOM | |||
* DOM = document object model | |||
* tree representation of an HTML document | |||
* with lots of access methods | |||
* purpose: read and change HTML page under control of JS | |||
jQuery | |||
* standardized methods for accessing DOM (and other stuff) | |||
* pattern: specify nodes => change nodes | |||
* specify nodes via tag, id, & class (same identifiers used by CSS) | |||
Latest revision as of 01:10, 6 March 2014
The video from the lecture given on February 28, 2014 is available:
MongoDB
Data "types":
- Databases: sets of collections
- collections: sets of documents
- documents: sets of properties and values
Database operations:
- create/add a database
- drop/delete a database
- add a collection to a database
- remove a collection from a database
- select a collection to use
Collection operations:
- retrieve all documents
- retrieve specific documents matching a set of conditions
- add/insert a document
- remove/delete a document
- replace a set of document
Document operations:
- stored as a JS object with _id unique identifier
- set/change value of a property
- retrieve value of a property
- => key/value store or associative array
Transactions: (not in MongoDB)
- start a transaction
- specify queries to match documents/records
- specify changes to those documents/records
- commit changes if none of the specified data has been changed by others
- if others have changed documents/records, abort transactions and undo all changes
- Airline example: reserve seat and record payment
- If you want transactions, use SQL (e.g., PostgreSQL, Oracle, MySQL (sort of)), at the price of some performance
Ethics
client-side JS
Key difference between client-side and server-side JS: THE DOM
- DOM = document object model
- tree representation of an HTML document
- with lots of access methods
- purpose: read and change HTML page under control of JS
jQuery
- standardized methods for accessing DOM (and other stuff)
- pattern: specify nodes => change nodes
- specify nodes via tag, id, & class (same identifiers used by CSS)