localDB.js provides couple of functions to interact with localStorage API. Inspired by mongoDB.
this methods are available
- schema()
- add()
- remove()
- update()
- find()
- findAll()
- watch()
- empty()
- collections()
<script src="localDB.js"></script>
localDB.schema("users", ["id", "username", "email", "age"]);
localDB.schema("posts", ["title", "description", "userID"]);
localDB.add("users", {
id: 1
username: "Max",
email: "[email protected]",
age: 34
});
localDB.remove('users', {is: {username: "max"}});
//{is: {}} is like "==="
//{not :{}} is like "!=="
//{gt :{}} is like ">"
//{gte :{}} is like ">="
//{lt :{}} is like "<="
//{lte :{}} is like "<="
//{has :{arr: 32}} search for field in an array
localDB.update('users', {is: {username: "max"}}, {set: {age: 35 } );
//if you have an array item you can use pull or push method
localDB.update('users', {is: {username: "max"}}, {push: {arr: 34}} );
localDB.update('users', {is: {username: "max"}}, {pull: {arr: 34}} );
var cursor = localDB.find('users', {is: {username: 'max'}});
//var cursor = localDB.find('users', {gt: {age: 30}});
//find method return cursor object that contain this methods:
cursor.count() //return number of your items
cursor.fetch() // return an array
cursor.limit() // limit(0, 5) return just five items
cursor.where({not: {username: 'max'}}) // return cursor object
you can observe add, update and remove methods
localDB.watch('add', function(obj, colname){
//
});
localDB.watch('remove', function(obj, colname){
//
});
localDB.watch('update', function(obj, colname){
//
});
localDB.empty(users);
localDB.collections();
- Author: Alexander Naumov
- Doc (German): Offline Datenbank mit Javascript