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Answer Posted / alok saxena
Data Access layer is actually a part of Architecture layer.
It has 2 tier,3 tier or N tier Layer. Generally we use 3
tier Layer 1) Presentation layer,Business Logic layer and
then Data Access Layer. Data Access layer is a medium to
talk between database and Business Logic layer. It helps to
maintain flexibility,resuablity and even secuity also. In
security SQL Injection can be stopped with 3 iter
Archietcture.
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