IVsDataCommand.DeriveSchema Method

Definition

Namespace:

Microsoft.VisualStudio.Data.Services.SupportEntities

Assembly:

Microsoft.VisualStudio.Data.Services.dll

Package:

Microsoft.VisualStudio.Data.Services v17.10.40170

Overloads

DeriveSchema(String)	When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.
DeriveSchema(String, DataCommandType)	When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.
DeriveSchema(String, DataCommandType, IVsDataParameter[])	When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.
DeriveSchema(String, DataCommandType, IVsDataParameter[], Int32)	When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.

DeriveSchema(String)

When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.

public:
 Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataReader ^ DeriveSchema(System::String ^ command);

public Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader DeriveSchema (string command);

abstract member DeriveSchema : string -> Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader

Public Function DeriveSchema (command As String) As IVsDataReader

Parameters

command

String

A command for which to derive the schema that is specific to a data source.

Returns

IVsDataReader

An IVsDataReader object. This object provides a forward-only, read-only data stream that describes the layout of items and blocks, that is, the schema, for the reader object returned upon executing the specified command.

DeriveSchema(String, DataCommandType)

When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.

public:
 Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataReader ^ DeriveSchema(System::String ^ command, Microsoft::VisualStudio::Data::Services::SupportEntities::DataCommandType commandType);

public Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader DeriveSchema (string command, Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType commandType);

abstract member DeriveSchema : string * Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType -> Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader

Public Function DeriveSchema (command As String, commandType As DataCommandType) As IVsDataReader

Parameters

command

String

A command for which to derive the schema that is specific to a data source.

commandType

DataCommandType

A value from the DataCommandType enumeration representing the command type for the indicated command, specifying how to interpret the contents of the command parameter.

Returns

IVsDataReader

An IVsDataReader object. This object provides a forward-only, read-only data stream that describes the layout of items and blocks, that is, the schema, for the reader object returned upon executing the specified command.

DeriveSchema(String, DataCommandType, IVsDataParameter[])

When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.

public:
 Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataReader ^ DeriveSchema(System::String ^ command, Microsoft::VisualStudio::Data::Services::SupportEntities::DataCommandType commandType, cli::array <Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataParameter ^> ^ parameters);

public Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader DeriveSchema (string command, Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType commandType, Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataParameter[] parameters);

abstract member DeriveSchema : string * Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType * Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataParameter[] -> Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader

Public Function DeriveSchema (command As String, commandType As DataCommandType, parameters As IVsDataParameter()) As IVsDataReader

Parameters

command

String

A command for which to derive the schema specific that is to a data source.

commandType

DataCommandType

A value from the DataCommandType enumeration representing the command type for the indicated command, specifying how to interpret the contents of the command parameter.

parameters

IVsDataParameter[]

An array of DataParameter objects for the specified command type. While this is an input parameter, the DDEX provider is still able to set properties on individual out and return value parameters. However, these will not be populated when deriving schemas.

Returns

IVsDataReader

An IVsDataReader object. This object provides a forward-only, read-only data stream that describes the layout of items and blocks, that is, the schema, for the reader object returned upon executing the specified command.

DeriveSchema(String, DataCommandType, IVsDataParameter[], Int32)

When implemented by a class, derives the schema returned from a specified command. The schema indicates the layout of items and blocks in a data reader.

public:
 Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataReader ^ DeriveSchema(System::String ^ command, Microsoft::VisualStudio::Data::Services::SupportEntities::DataCommandType commandType, cli::array <Microsoft::VisualStudio::Data::Services::SupportEntities::IVsDataParameter ^> ^ parameters, int commandTimeout);

public Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader DeriveSchema (string command, Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType commandType, Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataParameter[] parameters, int commandTimeout);

abstract member DeriveSchema : string * Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType * Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataParameter[] * int -> Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader

Public Function DeriveSchema (command As String, commandType As DataCommandType, parameters As IVsDataParameter(), commandTimeout As Integer) As IVsDataReader

Parameters

command

String

A command for which to derive the schema that is specific to a data source.

commandType

DataCommandType

A value from the DataCommandType enumeration representing the command type for the indicated command, specifying how to interpret the contents of the command parameter.

parameters

IVsDataParameter[]

An array of DataParameter objects for the specified command type. While this is an input parameter, the DDEX provider is still able to set properties on individual out and return value parameters. However, these will not be populated when deriving schemas.

commandTimeout

Int32

The length of time, in seconds, to block the client before canceling the schema derivation and returning to the caller. A value of 0 indicates infinite time-out; a value of -1 indicates a provider default.

Returns

IVsDataReader

An IVsDataReader object. This object provides a forward-only, read-only data stream that describes the layout of items and blocks, that is, the schema, for the reader object returned upon executing the specified command.