Сергей Калинец "Не SQL-ом единым..."

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Not just SQL…
Serhiy Kalinets
Rails Reactor
kalinets@gmail.com
@skalinets
@skalinets 1

About Me
16 year in the
business
In .NET since 2005
Love to code
@skalinets 2

@skalinets 3

.NET
ASP.NET
SQL Server
Entity Framework
@skalinets 4

What do all some .NET developers
think about
EF?
@skalinets 5

@skalinets 6

Why Pain
Too much configuration
Leaking abstractions
Object model does not fit business model
Things become complicated ve...

@skalinets 8

But we know SQL!
And ORMs treat a custom SQL an
“advanced” feature
@skalinets 9

Micro ORMs:
the best from both worlds
Handcraft SQL for queries
Handles mapping for you
Require less code (and provide les...

Dapper
By Stack exchange
Is very fast
Works with POCO and dynamics
@skalinets 11

PetaPoco
Fast like Dapper
Works with strictly undecorated POCOs, or
attributed almost-POCOs
Built-in paging
SqlBuilder hel...

Get data
var article1 = db.Single<Article>(123);
var article2 =
db.Single<Article>(
"WHERE ArticleKey = @0", "ART-123");
@...

Modify data
var a = new article();
a.title = "My new article";
...
db.Insert(a);
// Update it
a.content = "Blah blah";
db....

Or this way..
db.Delete<article>(
"WHERE article_id=@0",
123);
db.Update<article>(
"SET title=@0 WHERE article_id=@1",
"Ne...

Simple Data
Fun project of @markrendle
Seems to be dead
But still is fun
@skalinets 16

Simple Data
return Database.Open()
.Users.FindAllByEmail(email)
.FirstOrDefault();
@skalinets 17

Problems with SQL
It’s kind of old school
Object relational impedance mismatch
Poor scaling out
Schema first
@skalinets 18

NoSQL
Lot of options
NoSQL == no schema-first
Easy scale / deployment
Something new to give a try…
@skalinets 19

NoSQL types
Document
Key-value storage
Column Family
Graph
http://nosql-database.org/ lists over 255 DBs
@skalinets 20

NoSQL: cons
New kid on the block
Almost no analytics
And a lot of others…
@skalinets 21

But still…
Most approaches store only the current view
Changing things retrospectively == PAIN
@skalinets 22

Event sourcing to rescue!
@skalinets 23

ES Concepts
Event is something that has happened
Event can always be applied (no validation
needed)
Events are persisted i...

How it works
Changes in domain trigger events
Entities (aggregates) accept events to update
it’s state
Views (projections)...

Event sourcing
https://msdn.microsoft.com/en-us/library/dn589792.aspx
@skalinets 26

ES plays nice with CQRS
@skalinets 27

Benefits
Simple storage for events
Endless choices for projections
Projections can be changed at any time
Maximum data is ...

d60 Cirqus
Simple but powerful event sourcing + CQRS kit
Fluent configuration
Support for multiple storages (MS SQL, Azure...

Cirqus Focus
Raw performance Polished APIs and general
usefulness
=========================(+)=============
Complex event ...

NEventStore
Storage agnostic event store
Focus on DDD / CQRS applications
@skalinets 31

But…
SQL (and MS SQL) are still in the game
There are more than one approaches to SQL
handling
There are more than one app...

And the most important
Don’t try it on work!
@skalinets 33

Resources
http://www.toptensoftware.com/petapoco/
https://github.com/StackExchange/dapper-dot-net
https://msdn.microsoft.c...

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