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soq

v0.0.1

Published

Simple Object Query Interface for JSON Array

Downloads

2

Readme

#SOQ Simple Object Query Interface for JSON Array

##Synopsis

It's not going to be anther JSON Database. SOQ is made to find pure JSON Objects in a more elegant and unobstructive way. It may be extended to act as middle layer between client and server DB.

##Query Language We accept a simple string a query conditions. And at least you shuold tell the query object which type of objects you want to find.

var query = Query.build({
	type: "vehicle",
	conditions: "name = 'Ford'"
});

In fact, the query interface have learned a bunch of condition types:

  • =
  • >=
  • >
  • <=
  • <
  • !=
  • BEGINS_WITH
  • ENDS_WITH
  • MATCH
  • TYPE_IS

And these condition operators are straightfoward.

It also should be noted that the value of a condition can be:

  • Numbers: 1,2,3,0.5,1.4…
  • Strings: "Hello", "Nice",…
  • Reserved Words: true, false, null, undefined

What's more you can pass mutiple conditions:

…
conditions: "name = 'Ford' and age > 3 or price < 1000"
…

Maybe you are wondering the priority of condtions. Yes, we don't support group conditions with parenthesises currently, which I have added into my TODO list. Anyway, I simply treat the former condition as the one with higher priority for now.

##Store In most of time, you don't deal with Query class directly. A Store Class is provided as gateway to access your data;

A simple use case:

var store = new Store();
store.add({
	"name": "Ford",
	"type": "vehicle"
}).add({
	"name": "BMW",
	"type": "vehicle"
}).add({
	"name": "Bike",
	"type": "other"
});

And then, we find what we want in this store:

var r = store.find({
  type: "vehicle",
  conditions: "name BEGINS_WITH 'B'"
});
//result is always in form of an array
//r[0].name == "BMW"

Also a getting-all-of-we-have method:

var all = store.all("vehicle");
//all.length === 2

Feel free to modify the objects you find in the store. But in the future, updating a record will be taken seriously with a specialized update method.

Removing a record:

store.remove(r[0]);//BMW is gone from our store!

More examples can be found at /spec/

##TODO

  • Data source support for store
  • Improving performance of Collection internal
  • Improving traversal of logic tree by reducing the context gradually

##Changes

  • 2012-3-12 16:24
    • Better support for reserved words
  • 2012-3-14 21:50
    • Group conditions

##Contacts You can find me:

  • http://robinqu.me/
  • http://twitter.com/robinqu
  • http://weibo.com/robinqu