文件名称:
嵌入式文档数据库LinvoDB.zip
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文件大小: 399kb
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上传时间: 2019-07-17
详细说明： 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 resultsSchemas - 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 theres 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 }); 标签：LinvoDB
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