Classe Column

Articolo
04/26/2013

The Column object represents a SQL Server column.

Gerarchia di ereditarietà

System.Object
  Microsoft.SqlServer.Management.Smo.SmoObjectBase
    Microsoft.SqlServer.Management.Smo.SqlSmoObject
      Microsoft.SqlServer.Management.Smo.NamedSmoObject
        Microsoft.SqlServer.Management.Smo.ScriptNameObjectBase
          Microsoft.SqlServer.Management.Smo.Column

Spazio dei nomi Microsoft.SqlServer.Management.Smo
Assembly: Microsoft.SqlServer.Smo (in Microsoft.SqlServer.Smo.dll)

Sintassi

'Dichiarazione
Public NotInheritable Class Column _
    Inherits ScriptNameObjectBase _
    Implements ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable,  _
    IMarkForDrop, IExtendedProperties, IRenamable
'Utilizzo
Dim instance As Column

public sealed class Column : ScriptNameObjectBase, 
    ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable, IMarkForDrop, 
    IExtendedProperties, IRenamable

public ref class Column sealed : public ScriptNameObjectBase, 
    ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable, IMarkForDrop, 
    IExtendedProperties, IRenamable

[<SealedAttribute>]
type Column =  
    class 
        inherit ScriptNameObjectBase 
        interface ISfcSupportsDesignMode 
        interface ICreatable 
        interface IAlterable 
        interface IDroppable 
        interface IMarkForDrop 
        interface IExtendedProperties 
        interface IRenamable 
    end

public final class Column extends ScriptNameObjectBase implements ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable, IMarkForDrop, IExtendedProperties, IRenamable

Nel tipo Column sono esposti i membri seguenti.

Costruttori

	Nome	Descrizione
	Column()	Initializes a new instance of the Column class.
	Column(SqlSmoObject, String)	Initializes a new instance of the Column class that has the specified parent and specified name.
	Column(SqlSmoObject, String, DataType)	Initializes a new instance of the Column class that has the specified parent and specified name.
	Column(SqlSmoObject, String, DataType, Boolean)	Initializes a new instance of the Column class that uses the specified parent, datayype, and optionally adding the FILESTREAM attribute.

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Proprietà

	Nome	Descrizione
	AnsiPaddingStatus	Gets a Boolean property value that specifies whether the ANSI_PADDING_ENABLED column option is active.
	Collation	Gets or sets the default collation that is used by the column.
	Computed	Gets the Boolean property value that specifies whether the column is the product of computed expression
	ComputedText	Gets or sets the Transact-SQL expression that is used to generate the value of a computed column
	DataType	Gets or sets the data type that is assigned to the column.
	Default	Gets or sets the default bound to the column.
	DefaultConstraint	Gets a default value for the column.
	DefaultSchema	Gets or sets the default schema that is bound to the column.
	ExtendedProperties	Represents a collection of ExtendedProperty objects. Each ExtendedProperty object represents an extended property for the Column object.
	ID	Gets the column ID that uniquely identifies the column.
	Identity	Gets or sets the Boolean property value that specifies whether the column is an identity column.
	IdentityIncrement	Gets or sets the identity increment for an identity column.
	IdentitySeed	Gets or sets the identity seed for an identity column.
	InPrimaryKey	Gets the Boolean property value that specifies whether the column is included in the definition of a primary key or unique key constraint.
	IsColumnSet	Gets or sets a Boolean value that specifies whether the column is a sparse column that is a member of a column set.
	IsDeterministic	Gets or sets the Boolean property value that specifies whether the value of a computed column can change in subsequent invocations.
	IsFileStream	Gets a boolean value that represents the FILESTREAM attribute of the column.
	IsForeignKey	Gets the Boolean property value that specifies whether the column is a foreign key.
	IsFullTextIndexed	Gets the Boolean property value that specifies whether the column participates in a full-text index.
	IsPersisted	Gets the Boolean property value that specifies whether the computed value of the Column object is saved with the data, thus avoiding a computation each time the column is accessed.
	IsPrecise	Gets or sets the Boolean property value that specifies whether a computed column is a precise value.
	IsSparse	Gets or sets the Boolean property value that specifies whether this is a sparse column. For more information about sparse columns, see Utilizzo di colonne di tipo sparse.
	Name	Gets or sets a String value that specifies the name of the column. Esegue l'override di NamedSmoObject.Name.
	NotForReplication	Gets the Boolean property value that specifies whether the column is participating in replication.
	Nullable	Gets or sets the Boolean property value that specifies whether the column can accept null values.
	Parent	Gets the SqlSmoObject object that is the parent of the Column object.
	Properties	Gets a collection of Property objects that represent the object properties. Ereditato da SqlSmoObject.
	RowGuidCol	Gets or sets the Boolean property value that specifies whether the column is automatically updated with a unique GUID value.
	Rule	Gets or sets the rule that is bound to the column.
	RuleSchema	Gets or sets the rule schema that is bound to the column.
	State	Gets the state of the referenced object. Ereditato da SmoObjectBase.
	StatisticalSemantics	Gets or sets a value to indicate whether a column has been enabled for Semantic Extraction and Indexing.
	Urn	Gets the Uniform Resource Name (URN) address value that uniquely identifies the object. Ereditato da SqlSmoObject.
	UserData	Gets or sets user-defined data associated with the referenced object. Ereditato da SmoObjectBase.

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Metodi

	Nome	Descrizione
	AddDefaultConstraint()	Adds a default constraint to the column.
	AddDefaultConstraint(String)	Adds a default constraint to the column.
	Alter	Updates any Column object property changes on the instance of SQL Server.
	BindDefault	Binds a default to the column.
	BindRule	Binds a rule to the column.
	Create	Creates a column on the instance of Microsoft SQL Server as defined by the Column object.
	Discover	Discovers a list of type Object. Ereditato da SqlSmoObject.
	Drop	Drops the column.
	EnumForeignKeys	Enumerates a list of foreign keys that reference the column.
	EnumIndexes	Enumerates a list of indexes that include the column.
	EnumUserPermissions	Enumerates a list of permissions for a specified user.
	Equals	Ereditato da Object.
	FormatSqlVariant	Formats an object as SqlVariant type. Ereditato da SqlSmoObject.
	GetContextDB	Gets the context database that is associated with this object. Ereditato da SqlSmoObject.
	GetDBName	Gets the database name that is associated with the object. Ereditato da SqlSmoObject.
	GetHashCode	Ereditato da Object.
	GetPropValue	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetPropValueOptional	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetPropValueOptionalAllowNull	Gets a property value of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetServerObject	Gets the server of the SqlSmoObject object. Ereditato da SqlSmoObject.
	GetType	Ereditato da Object.
	Initialize()	Initializes the object and forces the properties be loaded. Ereditato da SqlSmoObject.
	Initialize(Boolean)	Initializes the object and forces the properties be loaded. Ereditato da SqlSmoObject.
	IsObjectInitialized	Verifies whether the object has been initialized. Ereditato da SqlSmoObject.
	IsObjectInSpace	Verifies whether the object is isolated or connected to the instance of SQL Server. Ereditato da SqlSmoObject.
	MarkForDrop	Marks the column to be dropped when the Alter method is run on the column's parent Table object.
	Refresh	Refreshes the Column object properties. Esegue l'override di ScriptNameObjectBase.Refresh().
	Rename	Renames the column.
	SetParentImpl	Sets the parent of the SqlSmoObject to the newParent parameter. Ereditato da SqlSmoObject.
	ToString	Returns a String that represents the referenced object. Ereditato da SqlSmoObject.
	UnbindDefault	Unbinds the currently bound default from the column.
	UnbindRule	Unbinds the currently bound rule from the column.
	UpdateStatistics()	Updates Statistic objects that monitor this column.
	UpdateStatistics(StatisticsScanType)	Updates Statistic objects that monitor this column.
	UpdateStatistics(StatisticsScanType, Int32)	Updates Statistic objects that monitor this column using a sampled scan.
	UpdateStatistics(StatisticsScanType, Int32, Boolean)	Updates Statistic objects that monitor this column using a sampled scan.
	Validate	Validates the state of an object. Ereditato da SmoObjectBase.

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Eventi

	Nome	Descrizione
	PropertyChanged	Represents the event that occurs when a property is changed. Ereditato da SqlSmoObject.
	PropertyMetadataChanged	Represents the event that occurs when property metadata changes. Ereditato da SqlSmoObject.

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Implementazioni esplicite dell'interfaccia

	Nome	Descrizione
	IAlienObject.Discover	Discovers any dependencies. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.GetDomainRoot	Returns the root of the domain. Ereditato da SqlSmoObject.
	IAlienObject.GetParent	Gets the parent of this object. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.GetPropertyType	Gets the type of the specified property. Ereditato da SqlSmoObject.
	IAlienObject.GetPropertyValue	Gets the value of the specified property. Ereditato da SqlSmoObject.
	IAlienObject.GetUrn	Gets the Unified Resource Name (URN) of the object. Non fare riferimento direttamente a questo membro nel codice. Supporta l'infrastruttura di SQL Server. Ereditato da SqlSmoObject.
	IAlienObject.Resolve	Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. Ereditato da SqlSmoObject.
	IAlienObject.SetObjectState	Sets the object state to the specified SfcObjectState value. Ereditato da SqlSmoObject.
	IAlienObject.SetPropertyValue	Sets the property value. Ereditato da SqlSmoObject.
	ISfcPropertyProvider.GetPropertySet	Gets the interface reference to the set of properties of this object. Ereditato da SqlSmoObject.
	ISfcSupportsDesignMode.IsDesignMode	Gets a Boolean value that specifies whether the column supports design mode.

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Osservazioni

To get Column object properties, users can be a member of the public fixed server role.

To do any of the following, users must have ALTER permission on the parent table, or be a member of the db_owner fixed database role:

Set Column object properties and run the Alter method
Create a column
Drop a column

Thread Safety

Tutti i membri statici pubblici (Shared in Microsoft Visual Basic) di questo tipo sono sicuri per le operazioni a thread multipli. Non è invece garantita la sicurezza dei membri dell'istanza.

Esempi

Utilizzo degli oggetti di database

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.

Condividi tramite

Classe Column

Gerarchia di ereditarietà

Sintassi

Costruttori

Proprietà

Metodi

Eventi

Implementazioni esplicite dell'interfaccia

Osservazioni

Thread Safety

Esempi

Protezione dei thread

Vedere anche

Riferimento

Altre risorse

Risorse aggiuntive