LinvoDB 特性: 介绍
LinvoDB 是一个 Node.js/NW.js
的嵌入式数据库引擎，类似 MongoDB 和类 Mongoose 数据库，提供类似的接口，基于
NeDB 开发。
特性:
-
类 MongoDB 的查询引擎
-
基于 LevelUP 的持久化，可选择不同后端
-
NW.js 友好 - JS-only backend is Medea
-
高性能 - steady performance unaffected by DB size - queries are always indexed
-
自动索引
-
Live queries - make the query, get constantly up-to-date results
-
Schemas - built-in schema support
-
Efficient Map / Reduce / Limit
示例代码：
var LinvoDB = require("linvodb3");
var modelName = "doc";
var schema = { }; // Non-strict always, can be left empty
var options = { };
// options.filename = "./test.db"; // Path to database - not necessary
// options.store = { db: require("medeadown") }; // Options passed to LevelUP constructor
var Doc = new LinvoDB(modelName, schema, options); // New model; Doc is the constructor
LinvoDB.dbPath // default path where data files are stored for each model
LinvoDB.defaults // default options for every model
插入数据：
// Construct a single document and then save it
var doc = new Doc({ a: 5, Now: new Date(), test: "this is a string" });
doc.b = 13; // you can modify the doc
doc.save(function(err) {
// Document is saved
console.log(doc._id);
});
// Insert document(s)
// you can use the .insert method to insert one or more documents
Doc.insert({ a: 3 }, function (err, newDoc) {
console.log(newDoc._id);
});
Doc.insert([{ a: 3 }, { a: 42 }], function (err, newDocs) {
// Two documents were inserted in the database
// newDocs is an array with these documents, augmented with their _id
// If there's an unique constraint on 'a', this will fail, and no changes will be made to the DB
// err is a 'uniqueViolated' error
});
// Save document(s)
// save is like an insert, except it allows saving existing document too
Doc.save([ doc, { a: 55, test: ".save is handy" } ], function(err, docs) {
// docs[0] is doc
// docs[1] is newly-inserted document with a=55 and has an assigned _id
// Doing that with .insert would throw an uniqueViolated error for _id on doc, because it assumes all documents are new
});