Answer / subbaraja

Here 3 tier then we need to talk about UIlayer, Business
layer, Data layer.
UI layer: Requests the data form Business layer
Business layer : Acts according Business rules fetch or
insert data through the Data Layer.
Data Layer: Responsible for all Data base operations
requests from business layer

Answer / kavithasm

Three layers are
UI - User Interface
Busines Logic Layer
Data Access Layer

User Interface - Client sends request to the server.
Business Logic Layer - its for validation purpose.
Data Access Layer - Interacts with the server and returns
back to the business logic layer

Answer / p.ramakrishna

The three-tier or a multi tier architecture has client,
server and database. Where the client request is sent to
the server and the server in turn sends the request to the
database. The database sends back the information/data
required to the server which inturn sends it to the client.

code to generate a excel sheet and to write data into it --- -it has to fetch the excel sheet which is in one folder placed by us inside a project folder(i,e it has to create a instance of that excel sheet) and write the data into it row by row please respond as early as possible

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