es-entity

ORM framework for Node js based on Ecmascript 6 and Typescript.

Contributors

Nitin Bansal https://github.com/nitinbansal1989

Installation

$ npm install es-entity

Usage

Create DB context and provide connection configuration.

const es = require("es-entity");

Entity Class

Entity class is the reference to the table in the database. The property in this class are field objects which refers to the columns of the table.

Note: The class members are camel cased from the snake case database columns. Annotation for custom column name will be implemented in future.

class Employee {
    constructor() {
        this.id = new es.Number();
        this.name = new es.String();
        this.description = new es.String();
    }
}

DB Configuration

Context is provided with the connection parameters of the database to connect.

var config = new es.ConnectionConfig();
config.handler = "mysql";
config.hostname = "localhost";
config.name = "mysql";
config.username = "root";
config.password = "application";
config.database = "test";

Context

Context class is created which extends from es.Context. This class works as database context for all your queries. The property in this class as queryable object to the respective classes.

const Employee_1 = require("./Employee");
class EmpContext extends es.Context {
    constructor(config, entityPath) {
        super(config, entityPath);
        this.employees = new es.DBSet(Employee_1.default);
        this.init();
    }
}

Provide the database config object and mapping folder object to the context object to bind.

const EmpContext_1 = require("./modal/EmpContext");
var context = new EmpContext_1.default(config);

Operations

Select Entities

let p = context.employees.where((a) => {
    return (a.id.lt(q)).or(a.id.eq(2));
}).list();

p.then((v) => {
    for (var i = 0; i < v.length; i++) {
        var j = v[i];
        console.log("id: " + j.id + ", name: " + j.name + ", desc: " + j.description);
    }
});

Select Entity By Id

let p = context.employees.get(1);

p.then((v) => {
    console.log("id: " + v.id + ", name: " + v.name + ", desc: " + v.description);
});

Updating Entity

v.description.set("test update 2");
let p = context.employees.update(v);
p.then((v) => {
    console.log("id: " + v.id + ", name: " + v.name + ", desc: " + v.description);
    console.log("updated");
});

Inserting Entity

let a = context.employees.getEntity();
a.name.set("name 2");
a.description.set("desc insert 2");
let p = context.employees.insert(a);
p.then((v) => {
    console.log("id: " + v.id + ", name: " + v.name + ", desc: " + v.description);
    console.log("inserted");
});

Deleting Entity

let p = context.employees.delete(v);
p.then(() => {
    console.log("deleted");
});

Note: Currently it is very basic and only supports mysql. Please provide suggestions if any.