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ADO.NET Architecture
MIS3502: Application Integration and Evaluation
Paul Weinberg
weinberg@temple.edu
Adapted from material by Arnold Kurtz, David Schuff, and Paul Weinberg
The Database Server

Made up of

Database Management
System (DBMS)

Network Operating System
(NOS)
Database Server Has:
Oracle 10
Oracle’s API
• SQL APIs
Windows Server 2003
• Database-level Security
TCP/IP
• Network Protocols
• OS-level Security
Client/Application
Server Has:
Windows XP
Oracle Driver
TCP/IP
When things
get messy…
Client/Application
Server Has:
Windows XP
Oracle Driver
MSSQL Driver
DB2 Driver
TCP/IP
Database Server A:
Oracle 10
Oracle’s API
Windows
Server 2000
TCP/IP
Database Server B:
MSSQL 2005
MSSQL API
Windows Server
2003
TCP/IP
Database Server C:
The node communicating
with the database servers
have to have a driver for
each type of server (a lot of
management).
IBM DB2 9
DB2 API
Solaris (Sun)
TCP/IP
One solution: Microsoft Data
Access Components (MDAC)

Defines a standard set of routines with which an
application can access data in a data source
(from Windows online help)

Several components




ODBC – Open Database Connectivity
OLEDB – Object Linking and Embedding for
Databases
ADO (.NET) – ActiveX Data Objects for .NET
We’ll look at ODBC/OLEDB


The server has a single API, and the clients know how
to “talk” that API
Works through the Operating System
How it looks with
OleDB…
Client/Application
Server Has:
Windows XP
MS OleDB driver
Oracle DSN
MSSQL DSN
DB2 DSN
TCP/IP
Database Server A:
Oracle 10
OleDb API
Windows 2000
TCP/IP
Database Server B:
MSSQL 2005
OleDb API
Windows 2000
TCP/IP
Database Server C:
Instead of three drivers on the
client, there is a single driver with
multiple data sources defined.
IBM DB2 9
OleDb API
Solaris (Sun)
TCP/IP
Basic ADO.NET objects
(Microsoft Access example)
DataSet
Data table
.NET data provider
Data adapter
• The adapter is the interface
between the application and
.NET
• The command object
contains the SQL statement
The GUI is
populated
with data
from the
DataSet
Command
• The connection object
manages the direct interaction
with the database server
Database server
Connection
Database
“Disconnected data model”
The connection is only established
when data is retrieved or sent to
the database server
From Murach, M. and Boehm, A. “ASP.NET 2.0 Web Programming with C# 2005,” 2006, page 363.
via the
Microsoft
“Jet Engine”
topmovies.mdb
Closer look at the Dataset
• The data table object
consists of columns, rows,
and constraints.
• A column object represents
the metadata for a field in the
table.
Dataset
Data
relation
Data table
• A row object represents a
record (set of column data).
Constraint
Data
row
Data
column
• A constraint object
maintains data integrity
through primary key rules
and referential integrity.
• A relation object contains
information about the
relationships between the
tables.
From Murach, M. “C# 2005,” 2006, page 519.