ldbjs

ldbjs

A lib to create and manage local db files and data, whit a simple send and get system,
save any data, html content, js objects and arrays, json, some texts, anything.

The erros in the operations is automatically returned not include in yours callbacks.

Creating a db location folder

const ldb = require('ldbjs');

ldb.createDB('.', 'myDB'); // optional callback

And your db are created.

Creating DB file

const ldb = require('ldbjs');

ldb.createDB('.', 'myDB'); // optional callback
ldb.createDBFile('.', 'myDB', 'myDBFile'); // optional callback

The file extension are .ldb.

Sending data to my dbfile

const ldb = require('ldbjs');

ldb.createDB('.', 'myDB');
ldb.createDBFile('.', 'myDB', 'myDBFile');

let myData = 'Hello World!';

ldb.sendData('.', 'myDB', 'myDBFile', myData, ()=>{
	// this callback is optional
	console.log(`${myData} as been sended to my ldb DB!`);
});

Sent data is saved exactly as sent

Getting data from dbfile

const ldb = require('ldbjs');

ldb.getData('.', 'myDB', 'myDBFile', (data)=>{ // use callback
	console.log(data);
});

The returned value is the data of the file.
This function is used only with a callback to get the parameter.

Getting the DB files name

const ldb = require('ldbjs');

// ldb.dir is the project location
ldb.createDB(ldb.dir, 'db');

ldb.createDBFile(ldb.dir, 'db', 'test');
ldb.createDBFile(ldb.dir, 'db', 'hello');
ldb.json.createDBFile(ldb.dir, 'db', 'world');

// this return a table on console with the all files in the db
ldb.getDBFiles(ldb.dir, 'db');

To use a callback in that function use like this

ldb.getDBFiles(ldb.dir, 'db', (files)=>{
    console.log(files);
});

This function return the files name.

To overwrite data of the file

const ldb = require('ldbjs');

ldb.createDB('.', 'myDB');
ldb.createDBFile('.', 'myDB', 'myDBFile');

let myData = 'I overwrited data!';

ldb.overwriteData('.', 'myDB', 'myDBFile', myData); // optional callback

That action is irreversible.

Cloning the content to other dbfile

const ldb = require('ldbjs');

ldb.createDB('.', 'myDB');
ldb.createDBFile('.', 'myDB', 'myDBFile');

let myData = 'I overwrited data!';

ldb.sendData('.', 'myDB', 'myDBFile', myData); // optional callback

ldb.cloneDBFile('.', 'myDB', 'myDBFile', '.', 'myDB', 'myOtherDBFile', ()=>{ // optional callback
	console.log('cloned a db file');
});

To clone a file you need the two files created.

Deleting a dbfile

const ldb = require('ldbjs');

ldb.deleteDBFile('.', 'myDB', 'myDBFile', ()=>{ // optional callback
	console.log('the dbfile as been deleted');
});

That action is irreversible.

To rename a dbfile

const ldb = require('ldbjs');

ldb.renameDBFile('.', 'myDB', 'myDBFile', 'myNewDBFileName');

This function not receive a callback, are shown in the console the new stats of the file

Using events

const ldb = require('ldbjs');

ldb.event.on('create a DB', (path, name)=>{
	ldb.createDB(path, name);
});

ldb.event.emit('create a DB', '.', 'myDB');

Events are a very simple way to create and manage DBs and DBfiles in your application, don't repeat code anymore.

Sending and getting data from json

const ldb = require('ldbjs');

// createing a json dbfile
ldb.json.createDBFile('.', 'myJSONDBName', 'myJSONFileName', ()=>{
    // optional callback
    console.log('json dbfile created');
});

// sending the data

let myJSObj = {
    name: "Jhon",
    age: 27
};

ldb.json.sendData('.', 'myJSONDBName', 'myJSONFileName', myJSObj);

// getting the data
ldb.json.getData('.', 'myJSONDBName', 'myJSONFileName', (data)=>{
    cosole.log(data);
});

While a data are getted a js obj are return, the api automatically convert the json to a js object for you.

JSON insert

const ldb = require('ldbjs');

ldb.json.createDBFile('.', 'myJSONDBName', 'myJSONFileName');

let myJSObj = {
    name: "Jhon",
    age: 27
};

ldb.json.sendData('.', 'myJSONDBName', 'myJSONFileName', myJSObj);

ldb.json.insert('.', 'myJSONDBName', 'myJSONFileName', 'name', 'Alex', ()=>{
  // some code
});

To insert data use the index propertie to put a new value, this function must  
have a json file not empty to work.

### Base64 encode and decode

```javascript
const ldb = require('ldbjs');

let str = 'Hello World!';

// to encode a string
ldb.base64.encode(str);
// returns SGVsbG8gV29ybGQh

// to decode a string
ldb.base64.decode(str);
// returns Hello World!

This process use the base-64 module, this is downloaded like a dependecie.

Backup and rollback

const ldb = require('ldbjs');

ldb.backup('.', 'dbName', 'fileName');
// create a fileName.backup.ldb file

ldb.rollback('.', 'dbName', 'fileName');
// get the fileName.backup.ldb data and put in fileName.ldb

// To use in json is very similar, put the json module
ldb.json.backup('.', 'dbName', 'fileName');
// use the same logic

To report bugs or open a inssue in github repo or send a email to [e-mail] no spam pls.