Difference between revisions of "WebFund 2014W Lecture 13"
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* commit changes if none of the specified data has been changed by others | * 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 | * if others have changed documents/records, abort transactions and undo all changes | ||
* Airline example: reserve seat and record payment | |||
==Ethics== | ==Ethics== | ||
==client-side JS== | ==client-side JS== | ||
Revision as of 15:02, 28 February 2014
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