Advanced Database Operations in .NET framework

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22 Advanced Database Operations
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4 Creation of a data adapter (OleDbDataAdapter) for the command 5 Instantiating of an empty data container (DataSet) to be lled with data 6 Filling of the data container by the data adapter with help of the method Fill() 7 Access to the rst table in the data container (counting starts with 0) 8 Output of the data through pipelining of the table
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NOTE It is not possible to access the contents of the table with $Table Columnname, analogical to XML documents According to the ADONET object model, the DataTable object does not contain the columns directly, but DataRow objects instead WPS, however, can split DataTable objects in rows and columns when pipelining them With single DataRow objects, access to the columns via their names can be executed by the automatic mapping, as follows:
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$Table | % { $_UserSurname }
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You can also use two other syntax forms if the column name contains a blank:
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$Table | % { $_["User Surname"] } $Table | % { $_"User Surname" }
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Listing 221 Database Access with a DataSet via a Provider-Speci c Data Adapter to an
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Access Database
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# Parameters $CONNSTRING = "Provider=MicrosoftJetOLEDB40; Data Source=H:\demo\WPS\B_Database\usersmdb;" $SQL = "Select * from users order by UserSurname" # Open database "Open the database" $conn = New-Object SystemDataOLEDBOLEDBConnection($CONNSTRING) $connopen() "Status of database: " + $connState
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Data Access Using a DataSet
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# Execute SQL command "Execute command: " + $SQL $cmd = New-Object SystemDataOLEDBOLEDBCommand($sql,$conn) $ada = New-Object SystemDataOLEDBOLEDBDataAdapter($cmd) $ds = New-Object SystemDataDataSet $adaFill($ds, "user") | Out-null "Number of tables in dataset: " + $dsTablesCount "Number of datasets in table 1: " + $dsTables[0]RowsCount # Access to table $Table = $dsTables["user"] # Output "Output of the data:" $Table | Select UserFirstName, UserSurname, userid
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22 ADVANCED DATABASE OPERATIONS
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Figure 222 Output of the script
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22 Advanced Database Operations
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Provider-Independent Example
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In Listing 222, the database adapter is created by the provider factory Listing 222 Database Access with a DataSet via a Provider-Neutral Data Adapter
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to a Microsoft SQL Server Database
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# Parameters $PROVIDER = "SystemDataSqlClient" $CONNSTRING = "Data Source=\SQLEXPRESS;AttachDbFileName= H:\demo\wps\b_database\usersmdf;Integrated Security=True;" $SQL = "Select * from users" # Create Factory $provider = [SystemDataCommonDbProviderFactories]::GetFactory($PROVIDER) # Create Connection $conn = $providerCreateConnection() $connConnectionString = $CONNSTRING # Open Connection $connOpen(); "Status of database: " + $connState # Create Command $cmd = $providerCreateCommand() $cmdCommandText = $SQL $cmdConnection = $conn # Create Adapter [SystemDataCommonDbDataAdapter] $ada = $providerCreateDataAdapter() $adaSelectCommand = $cmd # Create Dataset $ds = New-Object SystemDataDataSet
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Data Access Using a DataSet
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# Retrieve data $e = $adaFill($ds, "User") 22 ADVANCED DATABASE OPERATIONS # Close database $ConnClose() "Status of database: " + $connState # Output "Number of Tables: " + $dsTablesCount "Number of Rows in Table 1: " + $dsTables[0]RowsCount # Access table $Table = $dsTables[0] # Print all rows "Rows:" $Table | Select UserFirstName, UserSurname, userid
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XML Export and Import
Single data tables or whole DataSets with multiple tables can be exported to XML les:
# Export to XML $TableWriteXml("H:\demo\WPS\B_Database\usersxml") $TableWriteXmlSchema("H:\demo\WPS\B_Database\usersxsd")
The export of the XML Schema (XSD) is useful for the later re-import of the XML document to a DataSet:
# Import DataSet XML $Table = New-Object SystemDataDataTable $TableReadXmlSchema("H:\demo\WPS\B_Database\usersxsd") $TableReadXml("H:\demo\WPS\B_Database\usersxml") $Table | ft
22 Advanced Database Operations
Data Access with the wwwIT-Visionsde PowerShell Extensions
Data access through ADONET classes is somewhat gossip because of the necessary handling of connections, commands, and adapters However, in most cases, only standard options are required The wwwIT-Visionsde PowerShell extensions provide the following commandlets to facilitate data access:
Test-DbConnection
Shows (True/False), if a connection can
be created Executes an SQL command on the data source The return value is a number indicating how many rows were affected Get-DataTable Displays a data volume according to an SQL command from a data source in form of a volume of DataRow objects (see Figure 223) Get-DataRow Delivers a row from a data source in the form of an ADONET DataRow object If the indicated SQL command retrieves more than one row, only the rst row is displayed (see Figure 224) Set-DataTable Saves changes in a DataTable object in the data source Set-DataRow Saves changes in a DataRow object in the data source