A Simple ORM Module

!UNDER DEVELOPMENT!

[] Improve cache system. [] Rewrite inner code with promise and simplify it.

GO TO ISSUES TO SEE KNOWN BUGS.

Install: npm install dbcover

Common Usage (in coffeescript):

{Observe, Model, Validators}   = require 'dbcover'
# Require whatever validator you need.
# List of validators: integer, string, email, required

# Define database connection
Observe.define 'repo',
  name: 'default'
  provider:
    type: 'mysql'
    options:
      host: 'localhost'
      port: 3306
      password: '123123'
      user: 'root'
      database: 'test'
      
Observe.define 'repo',
  name: 'pg'
  provider:
    type: 'postgresql'
    options:
      host: 'localhost'
      port: 3306
      password: '123123'
      user: 'root'
      database: 'test'

Observe.define 'cache',
  name: 'default'
  provider:
    type: 'redis'
    options:
      host: 'localhost'
      port: 6379

# Define an model
User = new Model
  meta:
    table: 'users'
    repo: 'pg'   # default repo name is 'default'
    cache: 'default' # leave meta.cache blank or set it false to disable caching
    ttl: 10  # cache expire time(seconds), must be set if cache is enabled for this model. if ttl < 1, then no expire time would be applied.
    fields: [
      # set auto to true to support auto increment columns
      {name: 'id', type: 'integer', auto: true, primkey: true, uniq: true}
      {name: 'email',   type: 'string', validator: 'email', primkey: true, uniq: true}
      {name: 'random_key', type: 'string', primkey: true}
      {name: 'age',     type: 'integer', validator: new Validators.integer(10, 100)}
      {name: 'extra',   type: 'json'}
      {name: 'created', type: 'timestamp'}
    ]
    # primkey(s) with one or more columns. remember to use the name you definded above, not the real column name.
    indices: [
      {name: 'pk', fields: ['email', 'age']}
    ]

  sayHi: () ->
    console.log 'hi'

  rename: (name, id)->
    deferred = Q.defer()
    raw_sql = "UPDATE #{@$table} SET name = ?, updated_at='#{new Date}' WHERE id = ?"
    # You may use @$repo.query to make customized queries.
    # Use ? or :var instead of raw variables to avoid SQL injection.
    @$repo.query raw_sql, [name, id], (err, result)->
      deferred.reject err if err?
      deferred.resolve result
    return deferred.promise

# Turn on debug, default is false
User.turnOnDebug(true)

# Creating instance
user = User.new
  userId: 23
  email: '[email protected]'
  age: 22

# Save instance 
promise = user.save()

# Updating attributes 
user.age = 23
user.extra = { nick: 'rankjie' }
promise = user.update()

# Deleting instance 
promise = user.delete()

# Count rows
promise = user.count()

# Count rows with WHERE age > 30
promise = user.count("age > 30")


# Query 
# All promises returned by Query or findBy, will be resolved with a set of instances ( first() and findByIndeices which has `uniq:true` will return just one object )
# Or, rejected with errors.
promise = User.findById(123)
# You can append '__gt' or '__lt' to the field name, that would equals to '>' and '<'
promise = User.find(age: 30, created__gt: 2334343).first()
promise = User.find(age__lt: 30, created: 2334343).first()
# Get all the entries
promise = User.find(age: 30).all()
# Find by primkeys 
promise = User.findByPk(userID: 234, age: 99)
# prim keys like random_key will be transformed to camel case like RandomKey
promise = User.findByRandomKey('someValue')


# list all the data
promise = User.find()
  .orderBy('created', 'desc')
  .all()

# list from 0 to 10
promise = User.find('age > ? and created > ?', [30, 234242])
  .orderBy('created', 'desc')
  .list(0, 10)

# get them all
promise = User.find('age > :age and created > :created')
  .set(age: 30, created: 1234324234)
  .orderBy('created', 'desc')
  .all()

# get the first one
promise = User.find('age > :age and created > :created')
  .set(age: 30, created: 1234324234)
  .orderBy('created', 'desc')
  .first()