sync

I have two arrays, old and new, which hold objects at each position. How would I sync or find the delta (i.e. what is new, updated and deleted from the new array compared to the old array) var o = [ {id:1, title:"title 1", type:"foo"}, {id:2, title:"title 2", type:"foo"}, {id:3, title:"title 3", type:"foo"} ]; var n = [ {id:1, title:"title 1", type:"foo"}, {id:2, title:"title updated", type:"foo"}, {id:4, title:"title 4", type:"foo"} ]; With the above data, using id as the key, we'd find that item with id=2 has an updated title, item with id=3 is deleted, and item with id=4 is new. Is there an

It is really a pain keeping production and development databases in sync manually. Is there any tool that allows one to keep the two databases in sync? Something like the amazing Laravel framework's migrations thing? I am using MySQL and PHP. I searched here and there but wasn't able to spot the right tool for the job. You should definitely have a look at phinx . Here's an example of a complex database migration step I performed using MySQL and PHP: https://coderwall.com/p/v3qg2q If I am not wrong you need a tool to create database version control to keep track of schema changes. You may use

Are there any good references for synchronisation algorithms? I'm interested in algorithms that synchronize the following kinds of data between multiple users: Calendars Documents Lists and outlines I'm not just looking for synchronization of contents of directories a la rsync ; I am interested in merging the data within individual files. DGentry SyncML is a standard for data synchronization of things normally associated with someone's personal organizer. Nokia and Motorola were both using it heavily a few years ago, but I don't know its current state. iCalendar is a calendar synchronization

So this is what I need to do before my traineeship ends. connect android app with the database from a website store some information into the database retrieve some information back from the database I have already experience with the standard sqlite build in android apps. The problem is, I need to let people get some information from the server so they can share information with the others. I have 3 weeks left before I'm done with my traineeship, so any help would be much appriciated. 1) Create an SQLite database (Windows GUI SQLite prog: http://sqliteadmin.orbmu2k.de/ ) 2) Put it on a server

Consider the following simple entity model: Entity A has a to-one relationship to Entity B called b . Entity B has an inverse to-one relationship called a . Neither relationship is optional. A B b < ----- > a Assume we have two devices (1) and (2) that begin fully synced. Each has one object of class A, and one object of class B, and they are associated with one another. On device 1, we have objects A1 and B1, and on device B we have the same logical objects A1 and B1. Now assume that simulateous changes are made on each device: On device 1, we delete B1, insert B2, and associate A1 with B2.