🗊Презентация Data Access Patterns. Three Tier Architecture

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Data Access Patterns. Three Tier Architecture, слайд №1Data Access Patterns. Three Tier Architecture, слайд №2Data Access Patterns. Three Tier Architecture, слайд №3Data Access Patterns. Three Tier Architecture, слайд №4Data Access Patterns. Three Tier Architecture, слайд №5Data Access Patterns. Three Tier Architecture, слайд №6Data Access Patterns. Three Tier Architecture, слайд №7Data Access Patterns. Three Tier Architecture, слайд №8Data Access Patterns. Three Tier Architecture, слайд №9Data Access Patterns. Three Tier Architecture, слайд №10Data Access Patterns. Three Tier Architecture, слайд №11
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Data Access Patterns
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Data Access Patterns

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Three Tier Architecture
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Three Tier Architecture

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Three Tier Architecture
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Three Tier Architecture

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Three Tier Architecture
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Three Tier Architecture

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Facade
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Facade

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Motivation Most software systems require persistent data (i.e. data that persists between program executions). In general, distributing low-level data access logic throughout a program is not a good idea (design).
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Motivation Most software systems require persistent data (i.e. data that persists between program executions). In general, distributing low-level data access logic throughout a program is not a good idea (design).

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Data Access Layer A better design is one that includes a data access layer which encapsulates the details of the underlying persistence API. It abstracts the low-level details of persistent storage. It provides an interface that is usually a better match for the style of programming used in the domain logic. For example, the data access layer might provide an OO interface onto relational data.
Описание слайда:
Data Access Layer A better design is one that includes a data access layer which encapsulates the details of the underlying persistence API. It abstracts the low-level details of persistent storage. It provides an interface that is usually a better match for the style of programming used in the domain logic. For example, the data access layer might provide an OO interface onto relational data.

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Data Access Patterns. Three Tier Architecture, слайд №8
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Data Access Layer To avoid problems associated with mixing SQL and application logic, SQL statements and data base design details are often encapsulated in a data access layer The data access layer presents an interface that is convenient for application programs.
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Data Access Layer To avoid problems associated with mixing SQL and application logic, SQL statements and data base design details are often encapsulated in a data access layer The data access layer presents an interface that is convenient for application programs.

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Program to an Interface; Not Implementation
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Program to an Interface; Not Implementation

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Three Tier Architecture
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Three Tier Architecture

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