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All commandlets are based on provider-neutral programming As long as commandlets expect a connecting string, they also allow the setting of a provider (parameter Provider) The setting of a provider is the optional, standard setting "MSSQL" Other possible values are "OLEDB", "ODBC", "ORACLE", and "ACCESS" Note that these short forms are expected, not the full provider-invariant name
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Data Access with the wwwIT-Visionsde PowerShell Extensions 397
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22 ADVANCED DATABASE OPERATIONS
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Figure 223 Use of Get-DataTable to access a Microsoft SQL Server table containing ight data
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Figure 224 Use of Get-DataRow to access the rst dataset in an Access table
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The script in Listing 223 shows the previously discussed commandlets in action The script executes all jobs of the prior scripts, but much more concisely! (Figure 225 shows the output) Listing 223 Database Access with the PowerShell Extensions of wwwIT-Visionsde
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# Requirements: wwwIT-Visionsde Commandlet Extension Library # http://wwwPowerShell doctorde # Parameters $SQL = "Select * from users order by UserSurname" $Conn = "Provider=MicrosoftJetOLEDB40;Data Source=H:\demo\PowerShell\B_Databases\usersmdb;" $Provider = "ACCESS" "----------Test database connections:" test-dbconnection -connection $Conn -provider $Provider "---------- Execute Commands:" $SQL1 = "Select count(*) from users" $SQL2 = "insert into users ( UserFirstName, UserSurname) values ('Hans', 'Meier')" $SQL3 = "delete from users where UserSurname='Meier'" invoke-ScalarDbCommand -connection $Conn -sql $SQL1 -provider $Provider invoke-DbCommand -connection $Conn -sql $SQL2 -provider $Provider invoke-ScalarDbCommand -connection $Conn -sql $SQL1 -provider $Provider invoke-DbCommand -connection $Conn -sql $SQL3 -provider $Provider invoke-ScalarDbCommand -connection $Conn -sql $SQL1 -provider $Provider "---------- Get Data " $table = Get-DbTable -connection $Conn -sql $SQL -provider $Provider $table | ft
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"---------- Select Row " $row = $table | where { $_usersurname -eq "P ster" } $Row "---------- Change Row " $rowUsercreateDate = [DateTime] "11/11/2005" $Row "---------- Update Data " $table | Set-DbTable -connection $Conn -sql $sql -provider $Provider -verbose "---------- Get Row" $SQL = "Select * from users where usersurname = 'P ster'" $row = Get-DbRow $Conn $SQL $Provider $row
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Figure 225 Output of the script in Listing 223
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In this chapter, you learned how to use the DataSet as a disconnected of ine cache for data This use, in contrast to the DataReader, allows changing data and writing the changes back to the database through the use of a data adapter However, you saw that a few steps are necessary each time you work with a DataSet This can be shortened a lot by the use of the www IT-Visionsde PowerShell Extension Library, which provides easy-to-use commandlets such as the following:
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Test-DbConnection Invoke-DbCommand Get-DataTable Get-DataRow Set-DataTable Set-DataRow
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C H A P T E R
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SECURITY SETTINGS
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In this chapter:
Windows Security Basics Classes Reading ACLs Reading ACEs 402 406 408 410
This chapter covers the management of access control lists for les, directories, and registry keys The access control list is a crucial concept of Windows that controls access to resources Resources such as le system objects and registry entries are protected by access control lists (ACLs) Windows PowerShell (WPS) offers two built-in commandlets for working with ACLs:
Get-Acl Set-Acl
Read the ACL of a resource Write the ACL of a resource
They include the basic functions of downloading and saving an ACL, depending on the displayed resource path With WPS 10, however, only the le system and the registry are supported
NOTE Besides the previously named commandlets, you need some knowledge from the NET namespace SystemSecurityAccessControl for the manipulation of ACLs
23 Security Settings
Windows Security Basics
For a better understanding using and changing security settings, the basics of Windows security are presented here
Accounts
User and groups are entities that can have rights on resources There are three different ways to describe an account:
Account name (for example, \\itv\hs) Security identi er, SID (for example, S-1-5-32-544) SDDL security identi er (for example, BA )
A SID is a number array in variable length In text form, the SID is indicated with a starting S
Security Descriptors
Each resource (for example, a le, a folder, an entry in the Active Directory, a registry key) possesses a so-called security descriptor (SD) for the saving of the access controls An SD consists of three parts:
The owner s security identi er (SID) of the account The discretionary ACL (DACL), which describes the access control The system ACL (SACL), which contains the auditing settings
Access Control Lists
An access control list (ACL) (DACL and SACL) consists of access control entries (ACEs) In turn, an ACE contains the following information:
Identity (trustee) The SID of the user or the group of users Access mask The access mask de nes the rights for the trustee For each object type (for example, le system entry, registry entry, Active Directory entry), there are different possible rights a trustee can receive Each right is a bit of a combination of bits with a 32-bit integer value As a rule, an access mask consists of an addition of several single access rights