3 Tier Architecture
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Transcript of 3 Tier Architecture
Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring PartnerBaabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
3-Tier Architecture
3-Tier Architecture
1-Tier Architecture
1-Tier Architecture
• In 1-Tier Architecture the file you want to work with must be accessible from a local or shared drive
• This is the simplest of all the architectures, but also the least secure
• Since users have direct access to the files, they could accidentally modify, delete the file by accident or on purpose
• So 1-tier architecture is simple and cheap, but usually unsecured and data can easily be lost if you are not careful
2-Tier Architecture
2-Tier Architecture
• This architecture is also called Client-Server architecture because of the two components
• The client that runs the application and the server that handles the database back-end
• The client computer usually can’t see the database directly and can only access the data by starting the client
• This means that the data on the server is much more secure
• Now users are unable to change or delete data unless they have specific user rights to do so
2-Tier Architecture
• The client-server solution also allows multiple users to access the database at the same time
• One other huge benefit is that the server is processing data that allows the client to work on the presentation and business logic only
• This mean that the client and the server is sharing the workload and by scaling the server to be more powerful than the client
• you are usually able to load many clients to the server allowing more users to work on the system at the same time.
3-Tier Architecture
• This involves one more layer called the business logic tier, service tier or middle tier (layer)
• In the client-server solution the client was handling the business logic and that makes the client “thick”
• A thick client means that it requires heavy traffic with the server, thus making it difficult to use over slower network connections like Internet and Wireless
• This means that only little communication is needed between the client and the middle tier making the client “thin” or “thinner”
• An example of a thin client is an Internet browser that allows you to see and provide information fast and almost with no delay
3-Tier Architecture
• As more users access the system a three-tier solution is more scalable than the other solutions because you can add as many middle tiers (running on each own server) as needed to ensure good performance (N-tier or multiple-tier).
3-Tier Architecture
• Security is also the best in the three-tier architecture because the middle layer protects the database tier
• There is one major drawback to the N-tier architecture and that is that the additional tiers increase the complexity and cost of the installation
Differences among 1-Tier,2-Tier,3-Tier Architecture
1-Tier 2-Tier Multi-Tier
Benefits Very simpleInexpensiveNo server needed
Good securityMore scalable
Faster execution
Exceptional security Fastest
execution“Thin” clientVery scalable
Issues Poor securityMulti user issues
More costlyMore complex“Thick” client
Very costlyVery complex
Users Usually 1 (or a few)
2-100 50-2000 (+)
3-Tier ArchitectureUIfrom transferobj import tobj
from Blogic import Blogic
class gui:
def userip(self):
print 'enter the Airline code'
self.int_Airline_Code=raw_input()
print 'enter the Airline Name'
self.vchr_Airline_Name=raw_input()
print 'enter the Airline Numeric Code'
self.int_Airline_Numeric_Code=raw_input()
tob=tobj()
tob._init_(self.int_Airline_Code,self.vchr_Airline_Name,self.int_Airline_Numeric_Code)
b=Blogic()
b.getdata(tob)
3-Tier ArchitectureUI
def main():
g=gui()
g.userip()
main()
3-Tier ArchitectureLogic
from transferobj import tobj
from Database2 import Data
class Blogic:
def getdata(self,tob):
self.int_Airline_Code=tob.int_Airline_Code
self.vchr_Airline_Name=tob.vchr_Airline_Name
self.int_Airline_Numeric_Code=tob.int_Airline_Numeric_Code
obj3=Data()
obj3.getdetails(tob)
3-Tier ArchitectureDataBase
from transferobj import tobj
import psycopg2
import sys
#Define our connection string
conn_string = " dbname='firstdb'"
# print the connection string we will use to connect
print "Connecting to database\n ->%s" % (conn_string)
# get a connection, if a connect cannot be made an exception will be raised here
conn = psycopg2.connect(conn_string)
# conn.cursor will return a cursor object, you can use this cursor to perform queries
cursor = conn.cursor()
print "Connected!\n"
3-Tier ArchitectureDataBase
class Data:
def getdetails(self,tob):
self.int_Airline_Code=tob.int_Airline_Code
self.vchr_Airline_Name=tob.vchr_Airline_Name
self.int_Airline_Numeric_Code=tob.int_Airline_Numeric_Code
cursor.execute("insert into tbl_Airlines values(%s,%s,%s)",(self.int_Airline_Code,self.vchr_Airline_Name,self.int_Airline_Numeric_Code))
cursor.execute("select * from tbl_Airlines");
result=cursor.fetchall()
print result
conn.commit()
Reference http://blog.simcrest.com/what-is-3-tier-architecture-and-why-do-you-need-it
http://www.c-sharpcorner.com/uploadfile/gowth/two-tier-and-three-tier-architecture-with-example/
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