Notes

This is a development version and works only with the latest code from source:Schevo/trunk

Tasks: #55

Evaluation

This is a simple standard use case.

A user starts to define a schema with several classes and relations step by step.

Results

Summary of the Evaluation Results

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Installation

Getting an overview on schevo website

Tasks: #56, #57

The windows installation is manually:

Tasks: #19, #20, #38

Create a Schema

Creates an folder "eval" which contains a "schema" directory:

evo db schema eval

tasks: #21, #23

Define an Schevo Class: Car

Create a Class Car

within eval/schema/schema_001.py

class Car(E.Entity):
    """Type of car."""

    manufacturer = f.string()
    model = f.string()
    modelYear = f.integer()

    _key(manufacturer, model, modelYear)

    def __str__(self):
        return '%s %s %s' % (self.modelYear, self.manufacturer, self.model)

Tasks: #26, #27, #28

Create the Schevo Database

within folder 'eval':

evo db evolve

the evolve command creates an "eval.evo" by default.

tasks: #24, #51

Add Instances

use the navigator to create instances:

evo nav

#52, #58

Create a Class: Owner

adding it to schema_001.py

class Owner(E.Entity):
    """Individual human being."""

    name = f.string()
    profession = f.string()

    _key(name)

    def __str__(self):
        return self.name

Create a Relation: 1:1

within schema_001.py

class Car:

after: modelYear = f.integer()

add : owner = f.entity('Owner')

Tasks: #29, #30, #31

Evolve the Database

evo db evolve

Tasks: #34, #43, #45

Add Instances and Relations

use the navigator to create instances:

evo nav

Create a Class: Driver

class Driver(E.Entity):
    """Individual human being."""

    name = f.string()
    licenseType = f.string()

    _key(name)

    def __str__(self):
       return self.name

Create a Relation: 1:N

Within class *Driver*

car = f.entity('Car')

Evolve the Database

evo db evolve

Add Instances and Relations

use the navigator to create instances:

evo nav

Define a Class: Road

class Road(E.Entity):
    """A Road. """

    name = f.string()
    length = f.integer()

    _key(name)

    def __str__(self):
        return self.name

Create a Relation: M:N

class Trip(E.Entity):
    """People can go places."""

    car = f.entity('Car')
    road = f.entity('Road')

    def __str__(self):
        return '%s is on %s' % (self.car, self.road)

Tasks: #32

Evolve the Database

evo db evolve

Add Instances and Relations

use the navigator to create instances:

evo nav

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Items which were removed from the initial evaluation sequence

Create an Example Database

fromt the command line:

• create a directory

• change into this directory

evo db create --app=schevo.example.todo todo.db

tasks: #42, #44

Launch Schevo Navigator

evo nav todo.db

tasks: #25