Condividi tramite

Classe AdomdDataReader

  • Articolo

Provides a means of reading a forward-only result set that is obtained by running a command, and can be used to access analytical data sources.

Gerarchia di ereditarietà

System.Object
  System.MarshalByRefObject
    Microsoft.AnalysisServices.AdomdClient.AdomdDataReader

Spazio dei nomi  Microsoft.AnalysisServices.AdomdClient
Assembly:  Microsoft.AnalysisServices.AdomdClient (in Microsoft.AnalysisServices.AdomdClient.dll)

Sintassi

'Dichiarazione
Public NotInheritable Class AdomdDataReader _
    Inherits MarshalByRefObject _
    Implements IDataReader, IDisposable, IDataRecord, IEnumerable
'Utilizzo
Dim instance As AdomdDataReader

public sealed class AdomdDataReader : MarshalByRefObject, 
    IDataReader, IDisposable, IDataRecord, IEnumerable

public ref class AdomdDataReader sealed : public MarshalByRefObject, 
    IDataReader, IDisposable, IDataRecord, IEnumerable

[<SealedAttribute>]
type AdomdDataReader =  
    class 
        inherit MarshalByRefObject 
        interface IDataReader 
        interface IDisposable 
        interface IDataRecord 
        interface IEnumerable 
    end

public final class AdomdDataReader extends MarshalByRefObject implements IDataReader, IDisposable, IDataRecord, IEnumerable

Nel tipo AdomdDataReader sono esposti i membri seguenti.

Proprietà

  Nome Descrizione
Proprietà pubblica Depth Gets a value indicating the depth of nesting for the current row.
Proprietà pubblica FieldCount Gets a value indicating the number of columns in the current row.
Proprietà pubblica IsClosed Gets a value indicating whether the data reader is closed.
Proprietà pubblica Item[Int32] Gets the value of a specified column in its native format, given the ordinal position of the column. In Microsoft Visual C#, this property is the indexer for the AdomdDataReader class.
Proprietà pubblica Item[String] Gets the value of a specified column in its native format, given the name of the column. In Microsoft Visual C#, this property is the indexer for the AdomdDataReader class.
Proprietà pubblica RecordsAffected This member is reserved for future use.

In alto

Metodi

  Nome Descrizione
Metodo pubblico Close Closes the AdomdDataReader.
Metodo pubblico CreateObjRef Criticità per la sicurezza. Ereditato da MarshalByRefObject.
Metodo pubblico Dispose Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
Metodo pubblico Equals Ereditato da Object.
Metodo pubblico GetBoolean Returns a Boolean that contains the value from the specified column.
Metodo pubblico GetByte Returns a Byte that contains the value from the specified column.
Metodo pubblico GetBytes This member is reserved for future use.
Metodo pubblico GetChar Returns a Char that contains the value from the specified column.
Metodo pubblico GetChars Returns an array of Char objects that contain a stream of values from the specified column.
Metodo pubblico GetData Returns a System.Data.IDataReader interface to be used when a column points to more remote structured data.
Metodo pubblico GetDataReader Gets an AdomdDataReader object from the specified column.
Metodo pubblico GetDataTypeName Returns a String that contains the full name of the data type for the specified column.
Metodo pubblico GetDateTime Returns a DateTime that contains the value from the specified column.
Metodo pubblico GetDecimal Returns a Decimal that contains the value from the specified column.
Metodo pubblico GetDouble Returns a Double that contains the value from the specified column.
Metodo pubblico GetEnumerator Gets an IEnumerator interface for iterating through the collection.
Metodo pubblico GetFieldType Returns a Type that represents the data type of the specified column.
Metodo pubblico GetFloat Returns a Float that contains the value from the specified column.
Metodo pubblico GetGuid Returns a Guid that contains the value from the specified column.
Metodo pubblico GetHashCode Ereditato da Object.
Metodo pubblico GetInt16 Returns an Int16 that contains the value from the specified column.
Metodo pubblico GetInt32 Returns an Int32 that contains the value from the specified column.
Metodo pubblico GetInt64 Returns an Int64 that contains the value from the specified column.
Metodo pubblico GetLifetimeService Criticità per la sicurezza. Ereditato da MarshalByRefObject.
Metodo pubblico GetName Returns the name of the specified column.
Metodo pubblico GetOrdinal Returns the ordinal position of the specified column.
Metodo pubblico GetSchemaTable Returns a DataTable that describes the column metadata of the AdomdDataReader.
Metodo pubblico GetString Returns a String that contains the value from the specified column.
Metodo pubblico GetTimeSpan Gets the value of the specified column as a TimeSpan object.
Metodo pubblico GetType Ereditato da Object.
Metodo pubblico GetValue Returns the value for the specified column in its native format.
Metodo pubblico GetValues Gets an array of values for all of the columns in the current row.
Metodo pubblico InitializeLifetimeService Criticità per la sicurezza. Ereditato da MarshalByRefObject.
Metodo pubblico IsDBNull Returns a Boolean that contains a value indicating whether the column is set to null.
Metodo pubblico NextResult This member is reserved for future use.
Metodo pubblico Read Advances the AdomdDataReader to the next row.
Metodo pubblico ToString Ereditato da Object.

In alto

Implementazioni esplicite dell'interfaccia

  Nome Descrizione
Implementazione esplicita dell'interfacciaMetodo privato IEnumerable.GetEnumerator Gets the enumerator that iterates through the collection.

In alto

Osservazioni

The AdomdDataReader class is the implementation of the [System.Data.IDataReader] interface for ADOMD.NET. All Microsoft .NET Framework data providers implement the [System.Data.IDataReader] interface as a way of quickly reading forward-only result sets.

To create an AdomdDataReader, you must call the ExecuteReader method of the AdomdCommand, rather than directly using a constructor.

While the AdomdDataReader is in use, the AdomdCommand and the associated AdomdConnection is busy serving the AdomdDataReader. While in this state, no operations can be performed on the AdomdConnection or AdomdCommand objects other than closing them. This remains the case until the Close or Dispose method of the AdomdDataReader is called. Changes made to a result set by another process or thread while data is being read may be visible to the user of the AdomdDataReader. However, the precise behavior is timing dependent.

IsClosed and RecordsAffected are the only properties that you can call after the AdomdDataReader is closed.

Protezione dei thread

I membri static (Shared in Visual Basic) pubblici di questo tipo sono affidabili. Non è invece garantita la sicurezza dei membri dell'istanza.

Vedere anche

Riferimento

Spazio dei nomi Microsoft.AnalysisServices.AdomdClient