orm

NodeJS ORM

About

Node-ORM is a NodeJS module for multiple databases using Object-Relational Mapping.

Installing

Install using NPM:

npm install orm

Connecting to a Database (MySQL in the example)

var orm = require("orm");
var db = orm.connect("mysql://username:password@hostname/database", function (success, db) {
    if (!success) {
        console.log("Could not connect to database!");
        return;
    }
    
    // you can now use db variable to define models
});

Defining a model

var Person = db.define("person", {
    "name"   : { "type": "string" },
    "surname": { "type": "string", "default": "" },
    "age"    : { "type": "int" }
}, {
    "methods" : {
        "fullName" :function () {
            return this.name + " " + this.surname;
        }
    }
});

Adding associations

Person.hasOne("father", Person);
// or just
Person.hasOne("mother"); // defaults to same model

Person.hasMany("friends", Person, "friend"); // will create a table "person_friends" with 2 fields (person_id and friend_id)

Creating the model on the database

Person.sync();

Creating and using a record

var John = new Person({
	"name"		: "John",
	"surname"	: "Doe",
	"age"		: 20
});
console.log("Hello, my name is " + John.fullName() + " and I'm " + John.age + " years old");

Saving record to database

John.save(function (err, JohnCopy) {
	if (!err) {
		console.log("Saved! ID=" + John.id); // you can use John or JohnCopy
	} else {
		console.log("Something went wrong...");
		console.dir(err);
	}
});

Changing associations

I think an example is better to explain.

John.setFather(Jeremy, function () {
	John.setMother(Jane, function () {
		John.addFriends(Jeremy, Jane, function () {
			console.log("Jeremy and Jane (John's parents) are now his friends too");
		});
	});
});

If you want there's also this methods:

John.getFather(function (JohnFather) {
	console.log("John's father is " + JohnFather.name);
});
John.unsetMother(function () {
	console.log("John has no mother now!");
});
John.removeFriends(Jeremy, Jane, function () {
	console.log("John has no friends now!");
});
// or just don't send any, all will be removed
John.removeFriends(function () {
	console.log("John has no friends now!");
});

Supported Types

This values are still just supported for .sync() (table creations), not for other instance operations like .save() (yet).

Name	Description	MySQL Type	PostgreSQL Type
string	Small text	VARCHAR(255)	VARCHAR(255)
text	Big text	TEXT	TEXT
int, integer, num, number	Signed integer	INT	INTEGER
float	Floating point number	FLOAT	REAL
bool, boolean	True or false value	TINYINT(1) (true=1, false=0)	BOOLEAN
date	Date/time value (seconds precision)	DATETIME	TIMESTAMP
data	Binary data	BLOB	BYTEA
enum	Enumerated value	ENUM	ENUM
struct	Generic (and simple) object	TEXT (saved as JSON)	TEXT (saved as JSON)