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Setting Up the Variables for Our Main Script

The next step in our script is to initialize the variables required for our subscript. Later on, you will see that we use the same variables again and again within other subscripts, so any common variables (ones used in more than one script that still persist the same values) we initialize first; then the other variables that the subscript requires, we initialize right before we call our script. Table 3.1 lists the common variables that we have (and I envision) so far.

Table 3.1 Common Shared Variables for All Script within the Program

Variable Name

Description

AppShare

Tells the scripts where they can find the installation media.

DriveLetter

Specifies the drive letter to map for the install process.

MainLogFile

The log file for the Main.bat script. This is purposely kept separate from the other logs.

ScriptDir

Specifies where the scripts are.

ScriptName

The name of the script that is currently being executed.

SQLPath

The path to where the SQL Server program files will be installed.

SQLCollation

The collation order of the data pages of SQL Server.

CompanyName

The company name that SQL Server is registered to.

InstanceName

The named instance of SQL Server. We will use MSSQLSERVER, which is the default instance.


As you can see, there are a number of variables we share among the different scripts, and you will probably spot some more when we install SQL Server 2000 SP2.

Okay, so now our script begins to look like Listing 3.2.

Listing 3.2 Initializing the Common Variables within our Main Script.

:Main

       REM Set all the variables local to this script.
       setlocal

       REM Set up the parameters required to map a network drive to the 
       REM share that has the SQL Server installation media
       set appshare=\\<machinename>\<dir>
       set driveletter=Y:

       REM Set up the logging for the script
       REM NOTE: This log file is purposely kept separate from the other log files
       set MainLogFile=%TEMP%\main.log

       REM Set the directory that the scripts reside in
       set scriptdir=%SYSTEMDRIVE%\Personal
       set scriptname=main.bat

       REM  Set up the common parameters for all our scripts
       set SQLPath=%PROGRAMFILES%\Microsoft SQL Server\MSSQL
       set SQLCollation=SQL_Latin1_General_CP1_CI_AS
       set CompanyName=Microsoft
       set InstanceName=MSSQLSERVER

Now we need to simply initialize the variables that are required just for our first script (InstallSQLServer.bat); your code should look similar to Listing 3.3.

Listing 3.3 Initializing the Specific Variables Required by InstallSQLServer.bat.

       REM  Set up the parameters required for our sub script
       set SQLDataPath=%PROGRAMFILES%\Microsoft SQL Server\MSSQL\Data
       set SvcActDom=MSFT
       set SvcActName=ServiceSQL
       set SvcActPwd=097f738fb19d058f27b5
       set SQLsaPwd=password
       set TCPPort=1433
       set AppPath=%driveletter%\sql2k\x86\setup
       set ISSDir=%TEMP%
       set LogFile=%TEMP%\SQLInstall.log

Pretty simple so far isn't it? But that's the whole idea! The more complex the script(s), the harder it is to maintain them. Invest in a good script editor (I use EditPlus, a nice lightweight script editor); use comments well, and keep in mind the KISS (Keep It Simple, Stupid) principle.

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