How SignalR and SQL Dependency Work Process in ASP.NET with SQL Server?

Web Evolution
Static HTML Pages
Event-Based , Real-Time UI
Dynamic Pages , Forms
Partial Page Updates(Ajax),RIA

Server
Client
}
Delay
Request
Response
Time: requests event ‘n’ seconds (fixed time)

NOW WHAT TO DO…???
Right Path

What is a real time web application?

g
What is SQL Dependency?
As the word describes itself, it is
used to notify your application or
user when certain criteria or
condition is satisfied.
In short the SqlDependency provides
capabilities to your application to monitor
your database for data change without the
hassles of continuously querying the
database using timers or loops

It Means….!!!
When Data Changes in Database.
Server
Client 1
(With Sql SignalR & Sql Dependency)
Client 2
Server
(Without SignalR & Sql Dependency)
Client 2
Client 1

What happens when you don’t use SignaLR?
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
6 Month 12 Month 18 Month 24 Month
Speed

Types of SQL Dependency
Example:
Changes in notification
table then get all unread
notifications.
Example:
After Student Attendance
Send a SMS to Guardian of
the Student With
Attendance Date and Time.
Dependency
SQL
Dependency.
Table
Dependency
.

Table Dependency Code Example.

Top layer of Persistent Connection.
Can connect with 1-N clients.
Can send messages and call methods.
Routes automatically mapped.
SignalR handle the binding of complex object and arrays
of objects automatically.
Communication is serialized by JSON.
Hubs are per call, which means, each call from client to
the hub will create a new hub instance.
Server Side – Hub 2/2

client Side – 1/2
• Exposing methods from the server - The JavaScript
client can declare methods that the server can invoke.
• Method – name of the client side method.
• Callback – A function to execute when the server
invokes the method.
• - If you misspell names you will not get any warnings or
notifications even when logging is enabled.

Signalr requirements,
 Windows Server 2012.
 Windows Server 2008 R2.
 Windows 7/8/ Later Version.
 Windows Azure
 Operating System
 IIS – 7/7.5 (With Extension less URL(2); 8/8 Express)
 .Net – 4.5 framework.

How SignalR and SQL Dependency Work Process in ASP.NET with SQL Server?

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