c# - How to generate a reference number by using customer name and year? -


i want generate unique number based on customer name , date of birth.

if customer name chandra shekar , date of birth 28/12/1990.

i want xxxx-1990

xxxx should number should generate based on customer name.

how can generate number string value?

thank you.

this tricky if need able guarantee uniqueness immediately. scheme tries convert string "small" number (one smaller in terms of information original string) suffer possible collisions.

so depends on requirements. if need able reliably generate id later on give name , number purely algorithmically, you've got problem.

on other hand, if can store "name, date of birth, generated id" in table somewhere, start using hash of form (i wouldn't suggest using gethashcode there's no guarantee stay stable on time, common cryptographic hash should fine) , results in table. use part uniqueness, too. example, if hash "fred blogs" gave 1234, , did hash "jim smith", might end with:

fred blogs => 1234-0-1990 jim smith =>  1234-1-1990

but again, if you're in situation consider generating globally unique id start with. it's working out exact requirements before try solve them. say, should abandon idea of "a number unique" - that's doomed due pigeonhole principle.

as habib mentions, need consider possibility of multiple customers same name , birth date.


Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more