Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C# the
business layer?
Thanks a lot.
25  2216 
The 3-tier model is based upon separation of general functionality. You have
3 tiers:
Interface
Business
Data
Each tier is more specific than the one below.
The Data Tier is only for working with underlying data stores. It knows
nothing of specific business rules about how to handle the data. It only
knows how to fetch it, change it, delete it, that sort of thing. It is a
programming interface to the data that any application stores. As such, it
is agnostic of any rules concerning what the data is, or how it is to be
treated. It is the "supply clerk" of the organization. This way it can be
used by many applications.
The Business Tier is for manipulating the data. It contains the Business
logic and Business rules that comprise the "engine" of an application. It
knows everything about the Data Tier, while the Data Tier knows nothing
about the Business Tier. The Business Tier works with Data, but does nothing
to expose it to a user. It does expose what is necessary for any other
component or application to be able to work with the data, and is in charge
of making sure that everything is handled according to the Business rules.
It has a programming interface, but no user interface. This way, the
functionality of the Business tier can be used in many different types of
interfaces.
The User Interface is the most specific. It knows nothing about the Data
Tier; that is the Business Tier's job. It knows everything about the exposed
API of the Business tier, and its job is to present the data to the user,
and to take input from the User and relay it to the Business Tier. It is a
"universal translator" for the application, which speaks human at one end,
and business API at the other.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl... Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C#
the business layer?
Thanks a lot.
I'd add that each tier should be allowed to be physically seperated as
well. All the tiers can operate on seperate servers / workstations.
Thanks for replying,
I was looking more for a description of how the business layer can be
expressed: a DLL,
a COM object, a WEB service?
Theoretically I understand the concept, but the practical side is difficult
for me to grab.
As I see it WEB services would solve the business layer, but what's used
when the application is Windows based?
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl... The 3-tier model is based upon separation of general functionality. You
have 3 tiers:
Interface
Business
Data
Each tier is more specific than the one below.
The Data Tier is only for working with underlying data stores. It knows
nothing of specific business rules about how to handle the data. It only
knows how to fetch it, change it, delete it, that sort of thing. It is a
programming interface to the data that any application stores. As such, it
is agnostic of any rules concerning what the data is, or how it is to be
treated. It is the "supply clerk" of the organization. This way it can be
used by many applications.
The Business Tier is for manipulating the data. It contains the Business
logic and Business rules that comprise the "engine" of an application. It
knows everything about the Data Tier, while the Data Tier knows nothing
about the Business Tier. The Business Tier works with Data, but does
nothing to expose it to a user. It does expose what is necessary for any
other component or application to be able to work with the data, and is in
charge of making sure that everything is handled according to the Business
rules. It has a programming interface, but no user interface. This way,
the functionality of the Business tier can be used in many different types
of interfaces.
The User Interface is the most specific. It knows nothing about the Data
Tier; that is the Business Tier's job. It knows everything about the
exposed API of the Business tier, and its job is to present the data to
the user, and to take input from the User and relay it to the Business
Tier. It is a "universal translator" for the application, which speaks
human at one end, and business API at the other.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl... Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C#
the business layer?
Thanks a lot.
If you are working in .NET 2.0, you'll want to become familiar
with Generics. There are ways to make the different layers
see only portions of your classes so as not to violate
certain design principles. http://www.eggheadcafe.com/articles/...ion_layers.asp
--
Robbe Morris - 2004-2006 Microsoft MVP C#
Earn money answering .NET questions http://www.eggheadcafe.com/forums/merit.asp
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl... Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C#
the business layer?
Thanks a lot.
A Web Service is an interface. It is a form of presentation tier. It exposes
the API of a set of business classes. A Business tier is a set of classes. A
DLL is a container for code. A COM object isn't even .Net. A Data Tier is
also a set of classes. The classes can reside in one or more assemblies. An
assembly is stored in one or more DLLs.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:Oy******** ******@TK2MSFTN GP05.phx.gbl... Thanks for replying,
I was looking more for a description of how the business layer can be
expressed: a DLL,
a COM object, a WEB service?
Theoretically I understand the concept, but the practical side is
difficult for me to grab.
As I see it WEB services would solve the business layer, but what's used
when the application is Windows based?
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl... The 3-tier model is based upon separation of general functionality. You
have 3 tiers:
Interface
Business
Data
Each tier is more specific than the one below.
The Data Tier is only for working with underlying data stores. It knows
nothing of specific business rules about how to handle the data. It only
knows how to fetch it, change it, delete it, that sort of thing. It is a
programming interface to the data that any application stores. As such,
it is agnostic of any rules concerning what the data is, or how it is to
be treated. It is the "supply clerk" of the organization. This way it can
be used by many applications.
The Business Tier is for manipulating the data. It contains the Business
logic and Business rules that comprise the "engine" of an application. It
knows everything about the Data Tier, while the Data Tier knows nothing
about the Business Tier. The Business Tier works with Data, but does
nothing to expose it to a user. It does expose what is necessary for any
other component or application to be able to work with the data, and is
in charge of making sure that everything is handled according to the
Business rules. It has a programming interface, but no user interface.
This way, the functionality of the Business tier can be used in many
different types of interfaces.
The User Interface is the most specific. It knows nothing about the Data
Tier; that is the Business Tier's job. It knows everything about the
exposed API of the Business tier, and its job is to present the data to
the user, and to take input from the User and relay it to the Business
Tier. It is a "universal translator" for the application, which speaks
human at one end, and business API at the other.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl... Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C#
the business layer?
Thanks a lot.
Nicely put Kevin.
--
William Stacey [MVP]
....
Thanks Kevin,
Couldn't be a WEB service considered a business layer as long as it is a
class with different methods and the application that makes a reference
becomes a presentation layer?
I can create a service on a separate server for example, where I can put all
the business logic in it, but it does not have a presentation until I create
an application on another server (that makes a reference to the service)
which uses controls for the user input.
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:Ox******** ******@TK2MSFTN GP02.phx.gbl... A Web Service is an interface. It is a form of presentation tier. It
exposes the API of a set of business classes. A Business tier is a set of
classes. A DLL is a container for code. A COM object isn't even .Net. A
Data Tier is also a set of classes. The classes can reside in one or more
assemblies. An assembly is stored in one or more DLLs.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:Oy******** ******@TK2MSFTN GP05.phx.gbl... Thanks for replying,
I was looking more for a description of how the business layer can be
expressed: a DLL,
a COM object, a WEB service?
Theoretically I understand the concept, but the practical side is
difficult for me to grab.
As I see it WEB services would solve the business layer, but what's used
when the application is Windows based?
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl... The 3-tier model is based upon separation of general functionality. You
have 3 tiers:
Interface
Business
Data
Each tier is more specific than the one below.
The Data Tier is only for working with underlying data stores. It knows
nothing of specific business rules about how to handle the data. It only
knows how to fetch it, change it, delete it, that sort of thing. It is a
programming interface to the data that any application stores. As such,
it is agnostic of any rules concerning what the data is, or how it is to
be treated. It is the "supply clerk" of the organization. This way it
can be used by many applications.
The Business Tier is for manipulating the data. It contains the Business
logic and Business rules that comprise the "engine" of an application.
It knows everything about the Data Tier, while the Data Tier knows
nothing about the Business Tier. The Business Tier works with Data, but
does nothing to expose it to a user. It does expose what is necessary
for any other component or application to be able to work with the data,
and is in charge of making sure that everything is handled according to
the Business rules. It has a programming interface, but no user
interface. This way, the functionality of the Business tier can be used
in many different types of interfaces.
The User Interface is the most specific. It knows nothing about the Data
Tier; that is the Business Tier's job. It knows everything about the
exposed API of the Business tier, and its job is to present the data to
the user, and to take input from the User and relay it to the Business
Tier. It is a "universal translator" for the application, which speaks
human at one end, and business API at the other.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl...
Hello,
I try to understand how the business and presentation layers would
practically
translate into programming reality.
I read lots of articles about 3-tier, but none of them gave a practical
example
and I managed to understand the data layer only.
Is for example web services and their consumption an instance of
n-tier,
covering the business and presentation layers?
If it is not necessary a WEB development how would the presentation and
business
layer come to life, through what? Is ASP the presentation layer and C#
the business layer?
Thanks a lot.
The business layer is usually just an assembly dll used directly. If
you have functionality of the business layer you need to expose to
untrusted sources (such as partner companies, etc), you usually build a
facade layer to communicate with the business layer. The facade layer
could be a web service.
A web service should not be the business layer though; the web service
should be just another 'UI' to the business layer. that way you could
use the business layer in a windows forms application (and wouldn't
need to go throuh a web service).
If you put your business logic into a Web Service, you have bound the API
for that business logic to a Web Service interface. The Web Service itself
is an interface, but not a programming interface, strictly. Not a good idea,
since there is latency involved, and severe restrictions on the interface
itself. Everything passed through it must be serialized as XML.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:%2******** ********@TK2MSF TNGP03.phx.gbl. .. Thanks Kevin,
Couldn't be a WEB service considered a business layer as long as it is a
class with different methods and the application that makes a reference
becomes a presentation layer?
I can create a service on a separate server for example, where I can put
all the business logic in it, but it does not have a presentation until I
create an application on another server (that makes a reference to the
service) which uses controls for the user input.
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:Ox******** ******@TK2MSFTN GP02.phx.gbl...A Web Service is an interface. It is a form of presentation tier. It
exposes the API of a set of business classes. A Business tier is a set of
classes. A DLL is a container for code. A COM object isn't even .Net. A
Data Tier is also a set of classes. The classes can reside in one or more
assemblies. An assembly is stored in one or more DLLs.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:Oy******** ******@TK2MSFTN GP05.phx.gbl... Thanks for replying,
I was looking more for a description of how the business layer can be
expressed: a DLL,
a COM object, a WEB service?
Theoretically I understand the concept, but the practical side is
difficult for me to grab.
As I see it WEB services would solve the business layer, but what's used
when the application is Windows based?
"Kevin Spencer" <ke***@DIESPAMM ERSDIEtakempis. com> wrote in message
news:OV******** ******@TK2MSFTN GP03.phx.gbl...
The 3-tier model is based upon separation of general functionality. You
have 3 tiers:
Interface
Business
Data
Each tier is more specific than the one below.
The Data Tier is only for working with underlying data stores. It knows
nothing of specific business rules about how to handle the data. It
only knows how to fetch it, change it, delete it, that sort of thing.
It is a programming interface to the data that any application stores.
As such, it is agnostic of any rules concerning what the data is, or
how it is to be treated. It is the "supply clerk" of the organization.
This way it can be used by many applications.
The Business Tier is for manipulating the data. It contains the
Business logic and Business rules that comprise the "engine" of an
application. It knows everything about the Data Tier, while the Data
Tier knows nothing about the Business Tier. The Business Tier works
with Data, but does nothing to expose it to a user. It does expose what
is necessary for any other component or application to be able to work
with the data, and is in charge of making sure that everything is
handled according to the Business rules. It has a programming
interface, but no user interface. This way, the functionality of the
Business tier can be used in many different types of interfaces.
The User Interface is the most specific. It knows nothing about the
Data Tier; that is the Business Tier's job. It knows everything about
the exposed API of the Business tier, and its job is to present the
data to the user, and to take input from the User and relay it to the
Business Tier. It is a "universal translator" for the application,
which speaks human at one end, and business API at the other.
--
HTH,
Kevin Spencer
Microsoft MVP
Professional Numbskull
Hard work is a medication for which
there is no placebo.
"Dan Aldean" <da*******@yaho o.com> wrote in message
news:ua******** ******@TK2MSFTN GP04.phx.gbl...
> Hello,
>
> I try to understand how the business and presentation layers would
> practically
> translate into programming reality.
> I read lots of articles about 3-tier, but none of them gave a
> practical example
> and I managed to understand the data layer only.
> Is for example web services and their consumption an instance of
> n-tier,
> covering the business and presentation layers?
> If it is not necessary a WEB development how would the presentation
> and business
> layer come to life, through what? Is ASP the presentation layer and
> C# the business layer?
>
> Thanks a lot.
>
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