nodejs的跨数据库ORM框架：JugglingDB
jopen
12年前
JugglingDB为nodejs提供了一个跨数据库的ORM框架，通过一个共同的接口来访问大部分流行的数据库。当前支持：mysql, sqlite3, postgres, couchdb, mongodb, redis, neo4j 和js-memory-storage (yep, 自写的引擎仅用于测试使用)。你可以为没有支持的数据库添加适配器。可以模仿已有的例子编写，超级简单。
var Schema = require('jugglingdb').Schema; var schema = new Schema('redis', {port: 6379}); //port number depends on your configuration // define models var Post = schema.define('Post', { title: { type: String, length: 255 }, content: { type: Schema.Text }, date: { type: Date, default: Date.now }, published: { type: Boolean, default: false, index: true } }); // simplier way to describe model var User = schema.define('User', { name: String, bio: Schema.Text, approved: Boolean, joinedAt: Date, age: Number }, { restPath: '/users' // tell WebService adapter which path use as API endpoint }); // define any custom method User.prototype.getNameAndAge = function () { return this.name + ', ' + this.age; }; // models also accessible in schema: schema.models.User; schema.models.Post; // setup relationships User.hasMany(Post, {as: 'posts', foreignKey: 'userId'}); // creates instance methods: // user.posts(conds) // user.posts.build(data) // like new Post({userId: user.id}); // user.posts.create(data) // build and save Post.belongsTo(User, {as: 'author', foreignKey: 'userId'}); // creates instance methods: // post.author(callback) -- getter when called with function // post.author() -- sync getter when called without params // post.author(user) -- setter when called with object schema.automigrate(); // required only for mysql NOTE: it will drop User and Post tables // work with models: var user = new User; user.save(function (err) { var post = user.posts.build({title: 'Hello world'}); post.save(console.log); }); // or just call it as function (with the same result): var user = User(); user.save(...); // Common API methods // just instantiate model new Post // save model (of course async) Post.create(cb); // all posts Post.all(cb) // all posts by user Post.all({where: {userId: user.id}, order: 'id', limit: 10, skip: 20}); // the same as prev user.posts(cb) // get one latest post Post.findOne({where: {published: true}, order: 'date DESC'}, cb); // same as new Post({userId: user.id}); user.posts.build // save as Post.create({userId: user.id}, cb); user.posts.create(cb) // find instance by id User.find(1, cb) // count instances User.count([conditions, ]cb) // destroy instance user.destroy(cb); // destroy all instances User.destroyAll(cb); // Setup validations User.validatesPresenceOf('name', 'email') User.validatesLengthOf('password', {min: 5, message: {min: 'Password is too short'}}); User.validatesInclusionOf('gender', {in: ['male', 'female']}); User.validatesExclusionOf('domain', {in: ['www', 'billing', 'admin']}); User.validatesNumericalityOf('age', {int: true}); User.validatesUniquenessOf('email', {message: 'email is not unique'}); user.isValid(function (valid) { if (!valid) { user.errors // hash of errors {attr: [errmessage, errmessage, ...], attr: ...} } })