FastLegS

PostgreSQL ORM on top of node-postgres.

Installation

npm install FastLegS

Quickstart

NOTE: As of version0.2.0, both PostgreSQL and MySQL are supported. You indicate which database you are using at object instantiation time. All other operations and interfaces behave the same as older versions.

Setup for versions < 0.2.0

var FastLegS = require('FastLegS');
...
FastLegS.connect(connectionParams);
...

Setup for versions >= 0.2.0

MySQL:

var FastLegSBase = require('FastLegS');
var FastLegS = new FastLegSBase('mysql');
...
FastLegS.connect(connectionParams);
...

PostgreSQL:

var FastLegSBase = require('FastLegS');
var FastLegS = new FastLegSBase('pg');
...
FastLegS.connect(connectionParams);
...

Example:

var FastLegSBase = require('FastLegS');

// gonna use PostgreSQL
var FastLegS = new FastLegSBase('pg');

var connectionParams = {
  user: 'shes'
, password: 'got'
, database: 'legs'
, host: 'localhost'
, port: 5432
}

FastLegS.connect(connectionParams);

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id'
});

Post.create({ title: 'Some Title 1', body: 'Some body 1' }, function(err, results) {
  Post.find({ 'title.ilike': '%title%' }, { only: ['id', 'body'] }, function(err, post) {
    // Hooray!
  });
});

The Full Monty

The following examples use these database tables as examples:

posts

comments

Given this setup:

var FastLegSBase = require('FastLegS');

// gonna use PostgreSQL
var FastLegS = new FastLegSBase('pg');

var connectionParams = {
  user: 'shes', password: 'got',
  database: 'legs', host: 'localhost', port: 5432
}

FastLegS.connect(connectionParams);

var callback = function(err, results) {
  console.dir(err);
  console.dir(results);
}

var Comment = FastLegS.Base.extend({
  tableName: 'comments',
  primaryKey: 'id'
});

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id'
});

The following are examples of basic CRUD operations:

Create

Calls to create can take an object or an array of objects.

Post.create(
  { id: 5, title: 'Some Title 5', body: 'Some body 5' },
  callback
)

Post.create(
  [{ id: 6, title: 'Some Title 6', body: 'Some body 6' },
   { id: 7, title: 'Some Title 7', body: 'Some body 7' }],
  callback
)

The results passed to the callback are different depending on the database.

In the case of PostgreSQL, the results will be an object of the form:

{
  rows: [{ id: 5,
         title: 'Some Title 5',
         blurb: null,
         body: 'Some body 5',
         published: null }],
  command: INSERT,
  rowCount: 1,
  oid: 0
}

In the case of MySQL, the results will be an object of the form:

{
  fieldCount: 0,
  affectedRows: 1,
  insertId: 0,
  serverStatus: 2,
  warningCount: 0,
  message: ''
}

Read

The various forms of the find command are very flexible. We'll present a few of them here.

All:

Post.find({}, callback)

outputs:

[ 
  { id: 1,
    title: 'Some Title 1',
    blurb: null,
    body: 'Some body 1',
    published: null,
    created_at: null,
    updated_at: null },
  ...
  { id: 5,
    title: 'Some Title 5',
    blurb: null,
    body: 'Some body 5',
    published: null,
    created_at: null,
    updated_at: null },
  { id: 6,
    title: 'Some Title 6',
    blurb: null,
    body: 'Some body 6',
    published: null,
    created_at: null,
    updated_at: null },
  { id: 7,
    title: 'Some Title 7',
    blurb: null,
    body: 'Some body 7',
    published: null,
    created_at: null,
    updated_at: null } 
]

By primary key:

Post.find(6, callback)

outputs:

{
  id: 6,
  title: 'Some Title 6',
  blurb: null,
  body: 'Some body 6',
  published: null,
  created_at: null,
  updated_at: null
}

Only show some fields:

Post.find(6, {only: ['id','title']}, callback)

outputs:

{ id: 6, title: 'Some Title 6' }

Some clauses:

Post.find({'title.like': 'Some%'}, callback)
Post.find({'id.in': [6, 7]}, callback)
Post.find({'id.nin': [6]}, callback)
Post.find({'$or': {'id.equals': 5, 'body.like': '%body 7'}}, callback)

Order, offset, limit

Post.find({}, { order: ['-id'] }, callback)
Post.find({}, { offset: 1, limit: 1 }, callback)

Count:

Post.find({}, {count: true}, callback)

outputs:

{ count: 7 }

Update

Post.update(
  { title: 'Some Title 6' },
  { title: 'Renamed title' },
  callback
)

Delete

Post.destroy({ 'id.in': [5, 7]}, callback)
Post.truncate(callback)

A Taste of Relationships

You can call out relationships when you extend FastLegS.Base:

var Post = FastLegS.Base.extend({
  tableName: 'posts',
  primaryKey: 'id',
  many: [
    { 'comments': Comment, joinOn: 'post_id' }
  ]
});

You can then create complex object relationships with join logic:

Post.find(
  {}, 
  { include: { comments: { only: ['id', 'comment'] } } },
  callback
)

outputs:

[
  {
      body: 'Some body 1',
      title: 'Some Title 1',
      id: 1,
      updated_at: null,
      published: false,
      blurb: 'Some blurb 1',
      created_at: null,
      comments: [
          { id: 1, comment: 'Comment 1' },
          { id: 2, comment: 'Comment 2' }
      ]
  },
  {
      body: 'Some body 2',
      title: 'Some Title 2',
      id: 2,
      updated_at: null,
      published: true,
      blurb: null,
      created_at: null,
      comments: [
          { id: 3, comment: 'Comment 3' },
          { id: 4, comment: 'Comment 4' }
      ]
  },
  ...
]

Summary

The tests are an excellent reference for the various modifiers and syntactic sugar you can use in FastLegS.

ToDo

Watch for updates to examples in the near future to show features like relationships and advanced queries.