With the CData Cmdlets users can install a data module, set the connection properties, and start scripting. This section provides examples of using our OracleOci Cmdlets with native PowerShell cmdlets, like the CSV import and export cmdlets.

Connecting to Oracle OCI

Oracle OCI supports the following connection types:

• Oracle Server
• OracleTNS
• LDAP

Oracle Server

After you have added the appropriate libraries to your PATH (as described in Before You Connect), set these properties:

• User: The user Id provided for authentication with the Oracle database.
• Password: The password provided for authentication with the Oracle database.
• Port: The port used to connect to the server hosting the Oracle database.
• ServiceName: The service name of the Oracle database. You can obtain this value by querying global_name (select * from global_name) using the Oracle SQL*PLUS command line.
• Server: The host name or IP address of the server hosting the Oracle database.

OracleTNS

To authenticate via OracleTNS, set these properties:

• User: The user Id provided for authentication with the Oracle database.
• Password: The password provided for authentication with the Oracle database.
• DataSource: The connect descriptor (TNS connect string) or a connection name identifies the database you need to connect to. You can find these values in your tnsnames.ora file.

For example,

DataSource='(DESCRIPTION=(ADDRESS=(protocol_address_information))(CONNECT_DATA= (SERVICE_NAME=service_name)))'

LDAP

To authenticate via the LDAP server, set these properties.

• User: The user Id of a user account associated with the Oracle database.
• Password: The password associated with the specified user account.
• LDAPUri: The LDAP URI associated with the LDAP server you want to connect to.
• LDAPUser: The name of the user account on the specified LDAP server that you want to use to connect to Oracle OCI data.
  • Optional if your system administrator allows anonymous LDAP logins.
• LDAPPassword: The password associated with the specified LDAP user.
  • Optional if your system administrator allows anonymous LDAP logins.

Your connection string should look similar to this:

LDAPUri=ldap://myldap.com:389/SERVICE_EXMPL,cn=OracleContext,dc=example,dc=com; User=ORACLEUSER; Password=OracleUserPassword;

Creating a Connection Object

You can then use the Connect-OracleOci cmdlet to create a connection object that can be passed to other cmdlets:

$conn = Connect-OracleOci -User 'myUser' -Password 'myPassword' -Database 'NorthWind' -Server 'myServer'

Retrieving Data

After you have created a connection, you can use the other cmdlets to perform operations that you would normally expect to be able to perform against a relational database. The Select-OracleOci cmdlet provides a native PowerShell interface for retrieving data:

$results = Select-OracleOci -Connection $conn -Table ""CData"."SYSTEM".Customers" -Columns @("CompanyName, City") -Where "Country='US'"

The Invoke-OracleOci cmdlet provides an SQL interface. This cmdlet can be used to execute an SQL query via the Query parameter.

Piping Cmdlet Output

The cmdlets return row objects to the pipeline one row at a time. The following line exports results to a CSV file:

Select-OracleOci -Connection $conn -Table "CData"."SYSTEM".Customers -Where "Country = 'US'" | Select -Property * -ExcludeProperty Connection,Table,Columns | Export-Csv -Path c:\my"CData"."SYSTEM".CustomersData.csv -NoTypeInformation

You will notice that we piped the results from Select-OracleOci into a Select-Object cmdlet and excluded some properties before piping them into an Export-CSV cmdlet. We do this because the CData Cmdlets append Connection, Table, and Columns information onto each row object in the result set, and we do not necessarily want that information in our CSV file.

However, this makes it easy to pipe the output of one cmdlet to another. The following is an example of converting a result set to JSON:

 
PS C:\> $conn  = Connect-OracleOci -User 'myUser' -Password 'myPassword' -Database 'NorthWind' -Server 'myServer'
PS C:\> $row = Select-OracleOci -Connection $conn -Table ""CData"."SYSTEM".Customers" -Columns (CompanyName, City) -Where "Country = 'US'" | select -first 1
PS C:\> $row | ConvertTo-Json
{
  "Connection":  {

  },
  "Table":  ""CData"."SYSTEM".Customers",
  "Columns":  [

  ],
  "CompanyName":  "MyCompanyName",
  "City":  "MyCity"
} 

Deleting Data

The following line deletes any records that match the criteria:

Select-OracleOci -Connection $conn -Table "CData"."SYSTEM".Customers -Where "Country = 'US'" | Remove-OracleOci

Modifying Data

The cmdlets make data transformation easy as well as data cleansing. The following example loads data from a CSV file into Oracle OCI, checking first whether a record already exists and needs to be updated instead of inserted.

Import-Csv -Path C:\My"CData"."SYSTEM".CustomersUpdates.csv | %{
  $record = Select-OracleOci -Connection $conn -Table "CData"."SYSTEM".Customers -Where ("Id = `'"+$_.Id+"`'")
  if($record){
    Update-OracleOci -Connection $conn -Table "CData"."SYSTEM".Customers -Columns @("CompanyName","City") -Values @($_.CompanyName, $_.City) -Where "Id  = `'$_.Id`'"
  }else{
    Add-OracleOci -Connection $conn -Table "CData"."SYSTEM".Customers -Columns @("CompanyName","City") -Values @($_.CompanyName, $_.City)
  }
}