readme.txt

MSSQL备份及恢复的VC++源代码。提供给大家学习。

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       MICROSOFT FOUNDATION CLASS LIBRARY : RcMSSQL
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This source code drills down on administering SQL Server databases 
with the SQL Distributed Management Objects (SQL-DMO) object model.
This model is interesting to Office developers for three reasons:

1. It allows you to programmatically manipulate SQL Server with a hierarchical object model.
Most intermediate and advanced Access developers have substantial experience programming 
hierarchical object models working with the Office models. 
This means they can easily come up to speed on SQL-DMO. 

2.Microsoft used SQL-DMO to program SQL Server's Enterprise Manager. 
This graphical tool offers capabilities for SQL Server databases 
similar to those Database window offers for Jet databases. 
However, Enterprise Manager is not shipped with MSDE. 
Therefore, developers working with MSDE can build subsets of Enterprise Manager capabilities 
into their solutions by developing programs with SQL-DMO.

3.SQL-DMO exposes COM interfaces. This enables Access developers to program SQL-DMO 
as easily as creating a reference to its library and manipulating its objects - just as you 
do the object models of other Office components, such as Excel or Word. 



The SQL-DMO Object Model:
It displays selected objects referenced throughout this article while it 
presents an overview of the model's structure. At the top of the SQL-DMO model 
is the Application object. This is the source for all other SQL-DMO objects and collections. 

SQLObjectList
	|_______Application										The word no postfix 's' is Object
				|_______SQL Servers							The word add postfix 's' is Collenction
					|_______SQL Server
						|_______Databases
							|_______Database
								|_______Tables
									|_______Table
										|_______Indexes
										|_______Keys_______Key
										|_______Columns_______Column

FIGURE 1: Abridged SQL-DMO object model. 

Right below the Application object is the SQLServers collection. The members of 
this collection point at any SQL Server to which your workstation connects. 
Use a SQLServer object's Connect method to have the object reference a specific SQL Server, 
such as the one for the local workstation, which can be an MSDE server. 
In any computing environment, you can have multiple SQL Servers. 
My office has MSDE on one workstation, SQL Server 7 on a couple of other workstations, 
and SQL Server 2000 on two more workstations. Mid-sized and large organizations 
will often have one or more SQL Servers as development servers, and other SQL Servers 
that service a community of users for normal operating requirements. In these environments, 
developers sometimes need to copy databases for use on the road. 
These on-the-road applications often work best with disconnected computers. 
MSDE can be cost effective for these applications with disconnected computers, 
and SQL-DMO can help to efficiently administer those database applications. 

On any given server, you can have one or more databases. Each SQLServer object 
has its own Database collection. Within each database are database objects, 
such as tables, views, and stored procedures.
Views and stored procedures roughly correspond to stored queries for Jet databases. 
The Tables collection in a SQL Server database behaves similarly, but not identically, 
to the Tables collection in a Jet database. For example, any given table can have columns, 
keys, and indexes. A Column object enables you to manipulate the properties of a single column 
in a SQL Server table. You can also add and remove individual columns in a table 
with the Column object.

SQL Server also supports Key objects that can serve as the primary key and a foreign key 
for a table. Unlike Jet, SQL Server primary keys can be clustered, so records are physically 
stored in primary-key order. This greatly expedites retrieval. You have the choice of 
enabling the Clustered property of any other index for a table. Of course, 
because records can be physically ordered just one way on a storage device, 
you can enable the Clustered property of just one index per table.



Getting Started with SQL-DMO

The Help file for SQL-DMO is named sqldmo.hlp for SQL Server 7, 
and sqldmo80.hlp for SQL Server 2000.

HOWTO: Deploy SQL Distributed Management Objects 
with the Visual Basic Package and Deployment Wizard
File Name		Path 
Sqldmo.dll		\Mssql7\Binn\ 
Sqldmo.rll		\Mssql7\Binn\Resources\1033\ 
Sqlresld.dll	\Mssql7\Binn\ 
Sqlsvc.dll		\Mssql7\Binn\ 
Sqlsvc.rll		\Mssql7\Binn\Resources\1033\ 
Sqlwoa.dll		\Windows\System32\ 
Sqlwid.dll		\Windows\System32\ 
W95scm.dll		\Mssql7\Binn\