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* Design of the Microsoft SQL Server, Sybase, and TDS Data Providers in Mono
<ul>
* After much discussion among the Mono ADO.NET developers,
we have come up with the design of implementing a Sybase, Microsoft
SQL Server, and TDS Generic ADO.NET providers. These providers have
been created and are actively developed by Tim Coleman.
* Since Sybase and Microsoft SQL Server databases both
use the TDS protocol for data access, and other implementations
of TDS (FreeTDS and jTDS) have included support for multiple
versions of the TDS, we have decided to do the same.
* The TdsClient ADO.NET provider will be Mono's first provider
written completely in C# without any dependencies except
the usual suspects: corlib.dll, System.dll, and System.Xml.dll.
</ul>
* New ADO.NET Providers
<p>There will be three ADO.NET providers that will use TDS.
<ol>
<li><p>Mono.Data.SybaseClient namepace and assembly will
hold the ADO.NET provider for Sybase SQL Server database.
This provider uses TDS version 5.0 which
can only be used with Sybase databases.
<li><p>System.Data.SqlClient namespace and System.Data assembly
will hold the ADO.NET provider
for Microsoft SQL Server 7.0/2000 databases. This provider is to be
compatible with SqlClient in Microsoft .NET and uses TDS version 7.0
which only supports Microsoft SQL Server 7.0/2000.
There is TDS version 8.0
which we will need to support as well, but it is used for
Microsoft SQL Server 2000 databases.
<li><p>Mono.Data.TdsClient namespace and assembly is a generic
provider for older TDS databases. This provider will default to
using TDS version 4.2 which can be used by older Sybase and
Microsoft SQL Server databases.
</ol>
* Building The New Providers
<p> All three providers will use common internal code
at Mono.Data.TdsClient.Internal. Any classes in
Mono.Data.TdsClient.Internal will have the internal
keyword and will be built with the assembly of that provider.
<ol>
<li><p>SqlClient will build its assembly System.Data using files
from System.Data, System.Data.SqlClient, System.Data.SqlTypes,
System.Data.Common, and Mono.Data.TdsClient.Internal.
<p>SqlClient
will only reference the usual
suspects: corlib.dll, System.dll, and System.Xml.dll. SqlClient will be
a wrapper around TdsClient.Internal, but provide specific functionality to
Microsoft SQL Server 7.0/2000 databases.
<p>SqlClient build example:
<pre>
mcs -target:library -out:System.Data.dll \
System.Data.SqlClient/*.cs \
..\Mono.Data.TdsClient\Mono.Data.TdsClient.Internal\*.cs \
[any other classes in System.Data assembly...] \
-r corlib.dll -r System.dll -r System.Xml.dll
</pre>
<li><p>SybaseClient will build its assembly Mono.Data.SybaseClient using
files from Mono.Data.SybaseClient and Mono.Data.TdsClient.Internal.
SybaseClient will reference
the usual suspects plus System.Data.dll SybaseClient will
be a wrapper around TdsClient.Internal, but provide specific
functionality to Sybase.
<p>SybaseClient build example:
<pre>
mcs -target:library -out:Mono.Data.SybaseClient.dll \
Mono.Data.SybaseClient\*.cs \
..\Mono.Data.TdsClient\Mono.Data.TdsClient.Internal\*.cs
-r corlib.dll -r System.dll -r System.Xml.dll -r System.Data.dll
</pre>
<li><p>TdsClient will build its assembly Mono.Data.TdsClient
using files from Mono.Data.TdsClient
and Mono.Data.TdsClient.Internal. TdsClient will reference the
usual suspects plus System.Data.dll TdsClient is a wrapper
provider around TdsClient.Internal used for generic
unit tests. TdsClient will a wrapper around TdsClient.Internal
as a generic TDS provider
and allow TDS configuration options not exposed in SqlClient
nor SybaseClient, such as, TdsVersion will be exposed in TdsClient
but not in SqlClient nor SybaseClient.
<p>TdsClient build example:
<pre>
mcs -target:library -out:Mono.Data.TdsClient.dll \
Mono.Data.TdsClient\*.cs \
Mono.Data.TdsClient.Internal\*.cs \
-r corlib.dll -r System.dll -r System.Xml.dll -r System.Data.dll
</pre>
</ol>
* Classes in Mono.Data.TdsClient.Internal will:
<ul>
<li>use the internal keyword to prevent exposing these classes
to the System.Data.dll assembly.
<li> implement the ADO.NET interfaces just like any other ADO.NET provider, such as,
IDbConnection, IDbCommand, IDataReader, IDataRecord, IDataAdapter, etc...
<li> be sealed just like other providers
<li> provide features to be directly used by the SqlClient and SybaseClient
providers, such
as, setting the default TDS version: SqlClient to 7.0 and SybaseClient
to 5.0 and TdsClient to 4.2.
<li> be written completely in C# or IL assembly language (if need be).
<li> implement the TDS protocol version 4.2, 5.0, 7.0, and 8.0. This
is where most of the
work will take place.
<li> be an internal ADO.NET provider to the public ADO.NET providers:
System.Data.SqlClient, Mono.Data.SybaseClient, and Mono.Data.TdsClient.
</ul>
* Implementation Details of the TDS Protocol
<ul>
* will be implemented in pure C# from scratch
* will reside in Mono.Data.TdsClient.Internal
* will use FreeTDS and jTDS as rerferences.
</ul>
* More Information
<ul>
* <a href="http://www.freetds.org/">FreeTDS</a> is C API that implements
the TDS protocol. Has libraries for tds, ctlib, and dblib. It builds
and runs on Windows, Linux, and other platforms. FreeTDS provides
data access to Microsoft SQL Server and Sybase databases.
* <a href="http://jtds.sf.net/">jTDS</a> is a 100% Java JDBC provider
for Microsoft SQL Server and Sybase databases.
* <a href="http://www.freetds.org/tds.html">TDS Protocol</a>
</ul>
* Contribute
<p>Anybody willing to help? If so,
contact any of the people working on the ADO.NET support
in Mono: Rodrigo Moya, Tim Coleman, Daniel Morgan, Brian Ritchie,
Vladimir Vukicevic, Ville Palo, Franklin Wise, and others.
|
