138 lines
3.9 KiB
Markdown
138 lines
3.9 KiB
Markdown
## About
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JugglingDB -- cross-db ORM, providing **common interface** to access most popular database formats. Currently supported: mysql, mongodb, redis, neo4j and js-memory-storage (yep, self-written engine for test-usage only). You can add your favorite database adapter, checkout one of existing adapters to learn how, it's super-easy, I guarantee.
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## Installation
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git clone git://github.com/1602/jugglingdb.git
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## Usage
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```javascript
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var Schema = require('./jugglingdb').Schema;
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var s = new Schema('redis');
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// define models
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var Post = schema.define('Post', {
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title: { type: String, length: 255 },
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content: { type: Schema.Text },
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date: { type: Date, detault: Date.now },
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published: { type: Boolean, default: false }
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});
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var User = schema.define('User', {
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name: String,
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bio: Text,
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approved: Boolean,
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joinedAt: Date,
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age: Number
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});
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// setup relationships
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User.hasMany(Post, {as: 'posts', foreignKey: 'userId'});
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// creates instance methods:
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// user.posts(conds)
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// user.buildPost(data) // like new Post({userId: user.id});
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// user.createPost(data) // build and save
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Post.belongsTo(User, {as: 'author', foreignKey: 'userId'});
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// creates instance methods:
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// post.author(callback) -- getter when called with function
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// post.author() -- sync getter when called without params
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// post.author(user) -- setter when called with object
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s.automigrate(); // required only for mysql NOTE: it will drop User and Post tables
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// work with models:
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var user = new User;
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user.save(function (err) {
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var post = user.buildPost({title: 'Hello world'});
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post.save(console.log);
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});
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// Common API methods
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// just instantiate model
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new Post
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// save model (of course async)
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Post.create(cb);
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// all posts
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Post.all(cb)
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// all posts by user
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Post.all({userId: user.id});
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// the same as prev
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user.posts(cb)
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// same as new Post({userId: user.id});
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user.buildPost
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// save as Post.create({userId: user.id}, cb);
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user.createPost(cb)
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// find instance by id
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User.find(1, cb)
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// count instances
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User.count(cb)
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// destroy instance
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user.destroy(cb);
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// destroy all instances
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User.destroyAll(cb);
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```
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Read the tests for usage examples: ./test/common_test.js
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## Your own database adapter
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To use custom adapter, pass it package name as first argument to Schema constructor:
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mySchema = new Schema('couch-db-adapter', {host:.., port:...});
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Make sure, your adapter can be required (just put it into ./node_modules):
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require('couch-db-adapter');
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## Running tests
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All tests written using nodeunit:
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nodeunit test/common_test.js
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If you run this line, of course it will fall, because it requres different databases to be up and running, but you can use js-memory-engine out of box! Specify ONLY env var:
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ONLY=memory nodeunit test/common_test.js
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of course, if you have redis running, you can run
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ONLY=redis nodeunit test/common_test.js
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## Package structure
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Now all common logic desribed in ./index.js, and database-specific stuff in ./lib/*.js. It super-tiny, yep?
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## Project status
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This project written in one weekend (1,2 oct 2011), and of course it not pretend to be preduction-ready, but I plan to use this project as default ORM for RailwayJS in nearest future. So, if you familiar with some database engines - please help me to improve adapter for that database.
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For example, I know, mysql implementation sucks now, 'cause I'm not digging too deep into SequelizeJS code, and I think would be better to replace sequelize with something low-level in nearest future, such as `mysql` package from npm.
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## Contributing
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If you have found a bug please write unit test, and make sure all other tests still pass before pushing code to repo.
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## Roadmap
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### Common:
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+ validations
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+ -before and -after hooks on save, update, destroy
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+ default values
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+ more relationships stuff
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+ docs
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### Databases:
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+ riak
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+ couchdb
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+ low-level mysql
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+ postgres
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+ sqlite
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## License
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MIT
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