可以参看Martin.Fowler的企业应用架构设计模式。
"The Data Mapper is a layer of software that separates the in-memory
objects from the database. Its responsibility is to transfer data
between the two ends to isolate them from each other. With Data Mapper
the in-memory objects needn’t know even that there’s a database
present; they need no SQL interface code, and certainly no knowledge of
the database schema." (Fowler, Martin, Patterns of Enterprise
Application Architecture, p. 165) Data Mappers equate to what is known
as Data Access Logic Components (DALCs). This application block is
intended to make it easier for producers of business DALCs to create
common functionality that relates to managing "entities" with CRUD
functions. The DataMapper also promotes the use of stored procedures as
a best practice to abstract data access from the underlying data schema
and increase performance. Finally, the DataMapper allows capabilities
like the use of transactions, command timeouts, and caching properties
to be added, removed, and modified through configuration when needed.
For example, to add transactions or caching to a DALC, no code will
need to be modified -- only configuration settings
"The Data Mapper is a layer of software that separates the in-memory
objects from the database. Its responsibility is to transfer data
between the two ends to isolate them from each other. With Data Mapper
the in-memory objects needn’t know even that there’s a database
present; they need no SQL interface code, and certainly no knowledge of
the database schema." (Fowler, Martin, Patterns of Enterprise
Application Architecture, p. 165) Data Mappers equate to what is known
as Data Access Logic Components (DALCs). This application block is
intended to make it easier for producers of business DALCs to create
common functionality that relates to managing "entities" with CRUD
functions. The DataMapper also promotes the use of stored procedures as
a best practice to abstract data access from the underlying data schema
and increase performance. Finally, the DataMapper allows capabilities
like the use of transactions, command timeouts, and caching properties
to be added, removed, and modified through configuration when needed.
For example, to add transactions or caching to a DALC, no code will
need to be modified -- only configuration settings
下面是链接地址
http://www.gotdotnet.com/workspaces/workspace.aspx?id=452821ae-f375-4c59-aa15-3668815308d7