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Before Microsoft included support for OLE Automation and/or COM in SQL Server, administrators ran command prompt programs and commands using the xp_cmdshell extended stored procedure:
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xp_cmdshell {'command'} [, no_output]
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When xp_cmdshell is executed, a command string is passed to the command shell of the operating system to be executed. Any rows of text that are normally displayed by the command shell are returned
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by the extended stored procedure as a resultset. There is also an option to ignore the output. The status of the execution is set as a return parameter of the extended stored procedure. Its value is set to 0 , if successful, and 1 , if failed. In Windows 95 and Windows 98, its value will always be set to 0 . Figure 11-2 shows the use of the command prompt instruction to list files in the Backup folder. This output can be received in a temporary table and further processed in Transact-SQL code. The following batch copies files from the Backup folder to another drive.
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exec master..xp_cmdshell 'copy e:\w2kPro~1\Mocros~1\' + 'MSSQL\BACKUP\*.* m:', no_output
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Interaction with the SQL Server Environment
RUNNING WINDOWS SCRIPT FILES
The Windows Script Host enables users to write and execute scripts in VBScript, JavaScript, and other languages compatible with the Windows environment. It was initially developed as an additional component, but it is now integrated into the Windows 98, ME, and 2000 platforms. Script files usually have .vbs and .js extensions. They are executed from the Windows environment using Wscript.exe or from the command prompt using Csript.exe. Execution of script files can also be initiated from Transact-SQL code. The following statement runs a demo script that starts Excel and populates a worksheet with information:
exec xp_cmdshell 'c:\windows\command\cscript.exe ' + 'c:\windows\samples\wsh\Excel.vbs', NO_OUTPUT
INTERACTING WITH THE NT REGISTRY
Developers of client applications in a Win32 environment often use the Registry as a repository for application configuration data and defaults. The Registry is a database (but not an RDBMS) that stores configuration information centrally. It is a hierarchical database that consists of
w s s v
Subtrees Hives Keys (and sometimes subkeys) Value entries
Registry Subtrees
The largest division within the Registry hierarchy is the subtree, which is a folder within the Registry database that stores information of a particular type. These subtrees reside directly under the root of the Registry. Each subtree has an HKEY prefix to indicate to
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developers that it is a handle that can be used by a program. (A handle is a value that uniquely identifies a resource and allows programs to access that resource.) The Registry subtrees are
HKEY_LOCAL_MACHINE, which contains information about the local computer system, including hardware and operating system data, such as bus type, system memory, device drivers, and startup control data. HKEY_CLASSES_ROOT, which contains object linking and embedding (OLE) and file-class association data. HKEY_CURRENT_USER, which contains the user profile for the user who is currently logged on, including environment variables, desktop settings, network connections, printers, and application preferences. HKEY_USERS, which contains all actively loaded user profiles, including HKEY_CURRENT_USER, which always refers to a child of HKEY_USERS, and the default profile. Users accessing a server remotely do not have profiles under this key on the server; their profiles are loaded into the Registry on their own (local) computers. HKEY_CURRENT_CONFIG, which contains information about the hardware profile used by the local computer system at startup. This information is used to configure settings such as the device drivers to load and the display resolution to use.
Keys and Subkeys
Keys are the building blocks that compose the Registry hierarchy. Each key can contain data items (called value entries), as well as additional subkeys. Structurally, keys are analogous to directories, and value entries are analogous to files. A value entry is the value for a specific entry under a key or subkey in the Registry. Value entries appear as a string consisting of three components: the name of the value, the data type of the value, and the value itself, which can be data of any length. The Registry Editor is the main tool for viewing and editing contents of the Registry.
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