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We can offer
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services on a wide range of web, database and development issues. We are
Microsoft
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specialists and can offer advice and assistance with
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- creating scaleable tiered architectures built on the Windows 2003 Server
family with
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.
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Part of a successful
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website is a well designed, robust database. We can design a Microsoft SQL
Server or Microsoft Access database that will suit your
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requirements whether it is to allow users to shop online, browse
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and search catalogs, perform research, store membership information or act as a
data repository for your company. We can also take the design further and
create a
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so that it can be accessed by managers, staff and customers with the
appropriate level of access security.
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All Web service interaction is performed by exchanging SOAP messages as described in the previous section. To provide for a robust development and operational environment, services are described using machine-readable metadata. Metadata enables interoperability. Web service metadata serves several purposes. It is used to describe the message interchange formats the service can support, and the valid message exchange patterns of a service. Metadata is also used to describe the capabilities and requirements of a service. This last form of metadata is called the policy of a service. Message interchange formats and message exchange patterns are expressed in WSDL. Policies are expressed using WS-Policy. Contracts are expressed using all three kinds of metadata described above. Contracts are abstractions that insulate applications from the internal implementation details of the services they rely upon.
If you are suffering from slow data access, duplicate details or just trying to
import data into your
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existing database we can help. We have many years tuning, cleaning
and importing data into databases. Not convinced? -
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give us a try and well guarantee you will come back time and time again.
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Message replay attacks, in which the attacker injects previously sent (and hence correctly authenticated) messages into a conversation can be detected and addressed through sequence numbers, or the combination of timestamps and message caches.
We have over 20 years solid IT design,
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architecture and integration experience. We offer a full range of
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solutions based around Microsoft technologies to satisfy even the most
demanding clients.
Whether you are looking to add a
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to your existing application or database, create a brand new web based solution
or simply want a few pages to show the world your latest
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offering we would be happy to work with you to find an optimum cost
effective solution for
The rest of this document provides a detailed introduction to the Web services architecture. We review the Web services components and mechanisms they build upon, in support of the architecture's design. Each feature of the architecture is presented in the context of the specifications where it is defined.
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The rest of this document provides a detailed introduction to the Web services architecture. We review the Web services components and mechanisms they build upon, in support of the architecture's design. Each feature of the architecture is presented in the context of the specifications where it is defined.
An important area in which Web services differ from the World Wide Web is
scope.
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HTTP and HTML were designed around "read-mostly" interactive browsing of
content that is often static, or at least highly cacheable.
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In contrast, the Web services architecture is designed for highly dynamic
program-to-program interactions. In the Web services architecture,
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many kinds of distributed systems may be implemented. Examples include
synchronous and asynchronous messaging systems, distributed
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computational clusters, mobile-networked systems, grid systems, and
peer-to-peer environments. The broad
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spectrum of requirements in program-to-program interactions forces the Web
services protocol stack to be much more general purpose than the first
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Web protocols. However, like the Web, Web services rely on a small number of
specific protocols.
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We discuss these at more length later.
SOAP provides a simple and lightweight mechanism for exchanging structured and typed information between peers in a decentralized, distributed environment using XML. SOAP was designed to reduce the engineering cost of integrating applications built on different platforms as much as possible with the assumption that the lowest-cost technology has the best chance of gaining universal acceptance. A SOAP message is an XML document information item that contains three elements: ,
We envision that the next generation of mainstream applications will be based
on autonomous Web services. The implications of autonomy are central to the
architecture, and they
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will be explored throughout this paper. The technical content of this paper
describes the infrastructure protocols defining the Web services architecture
and a key concept needed to build autonomous distributed applications—the
concept of contracts.
The architecture's SOAP messaging foundation assures wide reach. SOAP messaging supports both asynchronous and synchronous patterns in a transport-independent manner. There is no infrastructure more flexible. To accelerate broad adoption of the Web services architecture, the specifications have been authored with an extensive collection of technical partners. Partnering with these key technology providers accelerates the deployment of devices and of programming environments that support the on-the-wire protocols. Achieving wide reach, widespread adoption, and scale-independent constructs are three of our core goals.
The core principles that have driven the design and implementation of the Web
service architecture protocols are as follows:
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Broadcast transports popularized one-to-many message transmissions. The original sender imposing its messages on the recipients by just sending them is referred to as the push model. While this model is effective in local-area networks, it does not scale well to wide-area networks nor offer recipients an option to regulate the message flow.
Message orientation—using only messages to communicate between and realizing
that messages often have a life beyond a given transmission event.
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Protocol composability—avoiding monoliths through the use of
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infrastructure protocol building blocks that may be used in nearly any
combination.
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Autonomous services—allowing
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endpoints to be independently built, deployed, managed,
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versioned, and secured.
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Managed transparency—controlling
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which aspects of an endpoint are (and are not) visible to external services.
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Protocol-based integration—restrictingWeb Consulting
cross-application coupling to wire artifacts only.
All Web service interaction is performed by exchanging SOAP messages as described in the previous section. To provide for a robust development and operational environment, services are described using machine-readable metadata. Metadata enables interoperability. Web service metadata serves several purposes. It is used to describe the message interchange formats the service can support, and the valid message exchange patterns of a service. Metadata is also used to describe the capabilities and requirements of a service. This last form of metadata is called the policy of a service. Message interchange formats and message exchange patterns are expressed in WSDL. Policies are expressed using WS-Policy. Contracts are expressed using all three kinds of metadata described above. Contracts are abstractions that insulate applications from the internal implementation details of the services they rely upon.
Software developers are always concerned with
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performance. Sometimes they get over-concerned and make their code
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jump through hoops to just trim a little execution time, in places where it
ultimately isn't significant—but that is a subject for another article. When it
comes to ADO.NET 1.x
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particularly
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those containing a large amount of data, the performance concerns expressed by
developers are indeed justified. Large
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are slow—in two different
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contexts.
Affected Software: Windows NT Server 4.0, Windows NT Server 4.0, Enterprise Edition, Windows NT Server 4.0, Terminal Server Edition, Windows 2000 Advanced Server, Windows 2000 Datacenter Server, Windows 2000 Server, Windows 2000 Professional, Windows XP Home Edition, Windows XP Professional, Windows Server 2003, Enterprise Edition, Windows Server 2003, Standard Edition, Windows Server 2003, Web Edition, Windows Server 2003, Datacenter Edition, Windows 98, Windows 98 SE, Windows Me
The first time the sluggish performance
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is felt is when loading a DataSet (actually, a DataTable) with a large number
of rows. As the number of rows in a DataTable increases, the time to load a new
row increases almost proportionally to the number of rows in the
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DataTable. The other time the performance hit is felt is when serializing and
remoting a large
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A key feature of the
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DataSet is the fact that it automatically knows how to serialize itself,
especially when we want to pass it between application tiers. However, a close
look reveals that this serialization
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is quite verbose,
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consuming much memory and network bandwidth. Both of these performance
bottlenecks are addressed in ADO.NET 2.0.
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The Query Designer inserts the keyword DISTINCT in front of the list of display columns in the SQL statement. Note If you use the DISTINCT keyword in Microsoft SQL Server, you cannot modify the data in datasheet view.
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