AdoDotNetSchemaReader Class

Artículo
10/02/2013

Provides a means for obtaining the schema of the IDataReader object encapsulating the result set.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.Data.DataReader
Microsoft.VisualStudio.Data.AdoDotNet.AdoDotNetSchemaReader

Namespace: Microsoft.VisualStudio.Data.AdoDotNet
Assembly: Microsoft.VisualStudio.Data (in Microsoft.VisualStudio.Data.dll)

Syntax

'Declaration
Public Class AdoDotNetSchemaReader _
    Inherits DataReader

public class AdoDotNetSchemaReader : DataReader

public ref class AdoDotNetSchemaReader : public DataReader

type AdoDotNetSchemaReader =  
    class 
        inherit DataReader 
    end

public class AdoDotNetSchemaReader extends DataReader

The AdoDotNetSchemaReader type exposes the following members.

Constructors

	Name	Description
	AdoDotNetSchemaReader(IDataReader)	Class constructor. Initializes a new instance of the AdoDotNetSchemaReader class with an IDataReader.
	AdoDotNetSchemaReader(IDataReader, IDbCommand)	Class constructor. Initializes a new instance of the AdoDotNetSchemaReader class with IDataReader and IDbCommand objects.

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Properties

	Name	Description
	InnerDataReader	Provides a means for accessing the underlying IDataReader object directly.
	IsClosed	Retrieves a Boolean value indicating whether or not the AdoDotNetSchemaReader is closed. (Overrides DataReader.IsClosed.)
	ItemCount	Retrieves an integer value specifying the number of data items contained in the current AdoDotNetSchemaReader instance. (Overrides DataReader.ItemCount.)
	SchemaTable	Retrieves the DataTable object that represents the schema of the IDataReader passed into the constructor of the AdoDotNetSchemaReader.
	Status	Retrieves a numerical status code returned by the method currently providing data to the DataReader object. (Overrides DataReader.Status.)

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Methods

	Name	Description
	Close	Closes the current AdoDotNetSchemaReader instance. (Overrides DataReader.Close().)
	Dispose()	Releases managed resources held for the current DataReader instance. (Inherited from DataReader.)
	Dispose(Boolean)	Cleans up resources associated with the current DataReader instance, both when the public Dispose method is called and as well as when the object is finalized with a call to the Finalize method. (Inherited from DataReader.)
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Finalizes the current DataReader instance. (Inherited from DataReader.)
	GetBytes	Reads a stream of bytes into the buffer as an array, starting at a specified offset (Overrides DataReader.GetBytes(Int32, array<Byte[], Int32, Int32).)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetItem(Int32)	Retrieves a data item at a specified index. (Overrides DataReader.GetItem(Int32).)
	GetItem(String)	Retrieves a data item with a specified name. (Overrides DataReader.GetItem(String).)
	GetItemMaxLength	Retrieves an integer value specifying the maximum length of the data item at the specified index. (Overrides DataReader.GetItemMaxLength(Int32).)
	GetItemName	Retrieves the string literal name of the data item at the specified index. (Overrides DataReader.GetItemName(Int32).)
	GetItemType	Retrieves the data type for a data item at a specified index and with a specified item type format. (Overrides DataReader.GetItemType(Int32, DataItemTypeFormat).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsNullItem	Retrieves a Boolean value indicating whether the data item at the specified index is nulla null reference (Nothing in Visual Basic). (Overrides DataReader.IsNullItem(Int32).)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	NextResult	Tests whether there is another result set and if true advances the AdoDotNetSchemaReader. (Overrides DataReader.NextResult().)
	Read	Tests whether there is another data record and if true advances the AdoDotNetSchemaReader to the next record. (Overrides DataReader.Read().)
	Terminate	Terminates the DataReader object immediately, without necessarily returning all of the data nor setting output parameters. (Overrides DataReader.Terminate().)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

Implements the IDataReader interface. This class takes as input an IDataReader object and expose the schema of the IDataReader object as a DDEX DataReader.

The format of the data reader exposed is that required by the DeriveSchema method, which has a fixed set of columns. It does not expose exactly the same information that is provided when calling the GetSchemaTable method on the underlying IDataReader instance.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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