CData ADO.NET Provider for HDFS は、HDFSConnection に標準DbConnection オブジェクトを実装しています。HDFSConnectionStringBuilder を使用して、プログラムで接続文字列をビルド、パース、およびリビルドすることもできます。

Connection オブジェクトの作成

接続文字列の定義と認証については、接続の確立 を参照してください。HDFSConnection オブジェクトを作成する一般的な呼び出しは以下のとおりです。

C#

using (HDFSConnection connection =   
  new HDFSConnection("Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;"))  
{  
  connection.Open();  
}

VB.NET

Using connection As New HDFSConnection("Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;")
  connection.Open
End Using

HDFSConnectionStringBuilder の使用

次のコード例は、ADO.NET 接続文字列ビルダーを使用して接続文字列をパースする方法を示します。

C#

HDFSConnectionStringBuilder builder =
  new HDFSConnectionStringBuilder("Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;");
  //Pass the connection string builder an existing connection string, and you can get and set any of the elements as strongly typed properties.
  builder.ConnectionString = "Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;";
  //Now that the connection string has been parsed,
  // you can work with individual items:
  builder.MyString = "new property";
  builder.MyBoolean = true;

  // You can refer to connection keys using strings, 
  // as well. 
  builder["Logfile"] = "test.log";
  builder["Verbosity"] = 5;

VB.NET

Dim builder As HDFSConnectionStringBuilder = New HDFSConnectionStringBuilder("Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;")
'Pass the connection string builder an existing connection string, and you can get and set any of the elements using strongly typed properties.
builder.ConnectionString = Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;"
'Now that the connection string has been parsed,
' you can work with individual items:
builder.MyString = "new property"
builder.MyBoolean = True
  
' You can refer to connection keys using strings, 
' as well. 
builder("Logfile") = "test.log"
builder("Verbosity") = 5