Data Access with ADO.NET

Data Access with ADO.NETADO.NET
3
= Is the .NET technology for accessing structured data
= Uniform object oriented interface for different data sources
– relational data bases
– XML data
– other data sources
= Designed for distributed and Web applications
= Provides 2 models for data access
– connection-oriented
– connectionless

…
Connection-oriented versus Connectionless
= Connection-oriented
– Keeps the connection to the data base alive
– Intended for applications with:
= short running transactions
= only a few parallel accesses
= up-to-date data
= Connectionless
– No permanent connection to the data source
– Data cached in main memory
– Changes in main memory ≠ changes in data source
– Intended for applications with:
= many parallel and long lasting accesses (e.g.: web applications)
…

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