AdoDotNetParameter Class

Artigo
10/02/2013

Represents a data parameter that is derived from a data source command, or that is passed with a command to a data source whose underlying technology is ADO.NET.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.Data.DataParameter
Microsoft.VisualStudio.Data.AdoDotNet.AdoDotNetParameter

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

Syntax

'Declaration
Public Class AdoDotNetParameter _
    Inherits DataParameter

public class AdoDotNetParameter : DataParameter

public ref class AdoDotNetParameter : public DataParameter

type AdoDotNetParameter =  
    class 
        inherit DataParameter 
    end

public class AdoDotNetParameter extends DataParameter

The AdoDotNetParameter type exposes the following members.

Constructors

	Name	Description
	AdoDotNetParameter(String)	Class constructor. Initializes a parameterized instance of the AdoDotNetParameter class, along with the name of the ADO.NET data provider being serviced by the connection.
	AdoDotNetParameter(String, IDataParameter)	Class constructor. Initializes a parameterized instance of the AdoDotNetParameter class, providing a parameter for a Command object and the name of the DDEX provider.
	AdoDotNetParameter(String, IDataParameter, Boolean)	Class constructor. Initializes a parameterized instance of the AdoDotNetParameter class, providing a parameter for a Command object, the name of the DDEX provider, and an indication whether the parameter is derived using the DeriveParameters method.

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Properties

	Name	Description
	DefaultPrecision	Retrieves a byte value specifying the default precision for the current parameter type. (Inherited from DataParameter.)
	DefaultScale	Retrieves a byte value specifying the default scale for the current parameter type. (Inherited from DataParameter.)
	DefaultSize	Retrieves and integer value specifying the default size for the current parameter type. (Inherited from DataParameter.)
	Direction	Retrieves or sets a DataParameterDirection object specifying the direction of the parameter. (Inherited from DataParameter.)
	IsDerived	Retrieves a Boolean value that indicates whether this parameter was derived from the data source. (Inherited from DataParameter.)
	IsFixedPrecision	Retrieves a Boolean value indicating whether the precision for the current parameter type is fixed. (Overrides DataParameter.IsFixedPrecision.)
	IsFixedScale	Retrieves a Boolean value indicating whether the scale for the current parameter type is fixed. (Overrides DataParameter.IsFixedScale.)
	IsFixedSize	Retrieves a Boolean value indicating whether the size for the current parameter type is fixed. (Overrides DataParameter.IsFixedSize.)
	IsNullable	Retrieves a Boolean value indicating whether this parameter can have a nulla null reference (Nothing in Visual Basic) value. (Inherited from DataParameter.)
	IsOptional	Retrieves a Boolean value indicating whether this parameter is optional, in cases where this parameter is a derived parameter. (Inherited from DataParameter.)
	Name	Retrieves or sets the string literal name of the parameter. (Inherited from DataParameter.)
	Parameter	Retrieves the IDataParameter object representing the command parameter.
	Precision	Retrieves or sets a byte value specifying the precision of the parameter. (Inherited from DataParameter.)
	Scale	Retrieves or sets a byte value specifying the scale of the parameter. (Inherited from DataParameter.)
	Size	Retrieves or sets an integer value specifying the size of the parameter. (Inherited from DataParameter.)
	Type	Retrieves or sets the data-source-specific type of the parameter. (Inherited from DataParameter.)
	Value	Retrieves or sets the value of the parameter. (Inherited from DataParameter.)

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Methods

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetDirectionImpl	Retrieves the parameter direction. (Overrides DataParameter.GetDirectionImpl().)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetIsNullableImpl	Retrieves a Boolean value indicating whether this parameter can be nulla null reference (Nothing in Visual Basic). (Overrides DataParameter.GetIsNullableImpl().)
	GetIsOptionalImpl	Retrieves a Boolean value indicating whether this parameter is optional. (Inherited from DataParameter.)
	GetNameImpl	Retrieves the name of the parameter. (Overrides DataParameter.GetNameImpl().)
	GetPrecisionImpl	Retrieves a byte value specifying the precision of the parameter. (Overrides DataParameter.GetPrecisionImpl().)
	GetScaleImpl	Retrieves a byte value specifying the scale of the parameter. (Overrides DataParameter.GetScaleImpl().)
	GetSizeImpl	Retrieves an integer value specifying the size of the parameter. (Overrides DataParameter.GetSizeImpl().)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetTypeFrom	Returns a AnsiString for a nulla null reference (Nothing in Visual Basic) or DBNull value; alternatively maps the value type to a DbType value and returns the string equivalent. (Overrides DataParameter.GetTypeFrom(Object).)
	GetTypeImpl	Retrieves the data-source-specific type of the parameter. (Overrides DataParameter.GetTypeImpl().)
	GetValueImpl	Retrieves the value of a specified parameter. (Overrides DataParameter.GetValueImpl().)
	IsSupportedDirection	Retrieves a Boolean value indicating whether the specified parameter direction is supported. (Inherited from DataParameter.)
	IsValidType	Retrieves a Boolean value indicating whether the specified data-source-specific type is a valid type. (Overrides DataParameter.IsValidType(String).)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnDirectionChanged	Called when the Direction property is changed to signal a change in the parameter direction. (Inherited from DataParameter.)
	OnDirectionChanging	Called when the Direction property is about to change. (Inherited from DataParameter.)
	OnNameChanged	Called when the Name property has changed. (Inherited from DataParameter.)
	OnNameChanging	Called when the Name property is about to change. (Inherited from DataParameter.)
	OnPrecisionChanged	Called when the Precision property has changed. (Inherited from DataParameter.)
	OnPrecisionChanging	Called when the Precision property is about to change. (Inherited from DataParameter.)
	OnScaleChanged	Called when the Scale property has changed. (Inherited from DataParameter.)
	OnScaleChanging	Called when the Scale property is about to change. (Inherited from DataParameter.)
	OnSizeChanged	Called when the Size property has changed. (Inherited from DataParameter.)
	OnSizeChanging	Called when the Size property is about to change. (Inherited from DataParameter.)
	OnTypeChanged	Called when the Type property has changed. (Inherited from DataParameter.)
	OnTypeChanging	Called when the Type property is about to change. (Inherited from DataParameter.)
	OnValueChanged	Called when the Value property has changed. (Inherited from DataParameter.)
	OnValueChanging	Called when the Value property is about to change. (Inherited from DataParameter.)
	Parse	Gets the DbType and attempts to parts the input string value into the correct type using primitive type conversions (like Byte.Parse and Int32.Parse). (Overrides DataParameter.Parse(String).)
	SetDirectionImpl	Sets the direction of the parameter using the DataParameterDirection enumeration. (Overrides DataParameter.SetDirectionImpl(DataParameterDirection).)
	SetNameImpl	Sets the name of the parameter. (Overrides DataParameter.SetNameImpl(String).)
	SetPrecisionImpl	Sets a byte value specifying the precision of the parameter. (Overrides DataParameter.SetPrecisionImpl(Byte).)
	SetScaleImpl	Sets a byte value specifying the scale of the parameter. (Overrides DataParameter.SetScaleImpl(Byte).)
	SetSizeImpl	Sets an integer value specifying the size of this parameter. (Overrides DataParameter.SetSizeImpl(Int32).)
	SetTypeImpl	Attempts to parse the string type into a DbType enumeration value using Enum.Parse and if this fails it assumes DbType.Object as the correct DbType. (Overrides DataParameter.SetTypeImpl(String).)
	SetValueImpl	Sets the value of this parameter. (Overrides DataParameter.SetValueImpl(Object).)
	ToString	Retrieves a string representation of the value of this parameter. (Inherited from DataParameter.)
	TryConvertValue	Attempts to convert the specified value to the specified type. (Inherited from DataParameter.)

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Remarks

This class provides a complete managed implementation that will be created by default from the AdoDotNetConnectionSupport class. The base implementation will deal in terms of the DbType enumeration when referencing parameter types. This is less than ideal, so it is recommended that a provider derive their own class from this one that overrides the various methods and properties to more closely represent their back-end-specific types and restrictions.

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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