JavaScript實現MongoDB查詢語言：Mingo

Mingo是MongoDB查詢語言的JavaScript實現。

安裝

$ npm install mingo

在瀏覽器中

<!-- DO NOT FORGET Underscore --> 
<script type="text/javascript" src="./underscore-min.js"></script>
<script type="text/javascript" src="./mingo-min.js"></script>

特性

• 比較操作符($gt, $gte, $lt, $lte, $ne, $nin, $in)
• 邏輯操作符 Operators ($and, $or, $nor, $not)
• Evaluation Operators ($regex, $mod, $where)
• 數組操作符 ($all, $elemMatch, $size)
• Element Operators ($exists, $type)
• Aggregation Pipeline Operators ($group, $match, $project, $sort, $limit, $unwind, $skip)
• Conditional Operators ($cond, $ifNull)
• Group Operators ($addToSet, $sum, $max, $min, $avg, $push, $first, $last)
• Arithmetic Operators ($add, $divide, $mod, $multiply, $subtract)
• String Operators ($cmp, $strcasecmp, $concat, $substr, $toLower, $toUpper)
• Set Operators ($setEquals, $setIntersection, $setDifference, $setUnion, $setIsSubset, $anyElementTrue, $allElementsTrue)
• Projection Operators ($elemMatch, $slice)
• JSON stream filtering and projection. NodeJS only

var Mingo = require('mingo');
// or just access *Mingo* global in browser

// setup the key field for your collection
Mingo.setup({
    key: '_id' // default
});

// create a query with criteria
// find all grades for homework with score >= 50
var query = new Mingo.Query({
    type: "homework",
    score: { $gte: 50 }
});

// filter collection with find()
var cursor = query.find(collection);

// shorthand with query criteria
// cursor = Mingo.find(collection, criteria);

// sort, skip and limit by chaining
cursor.sort({student_id: 1, score: -1})
    .skip(100)
    .limit(100);

// count matches
cursor.count();

// iterate cursor
// iteration is forward only
while (cursor.hasNext()) {
    console.log(cursor.next());
}

// use first(), last() and all() to retrieve matched objects
cursor.first();
cursor.last();
cursor.all();

// Filter non-matched objects (
var result = query.remove(collection);

項目主頁：http://www.baiduhome.net/lib/view/home/1422276537734