Classe Column

The Column object represents a SQL Server column.

Hierarquia de herança

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

Namespace:  Microsoft.SqlServer.Management.Smo
Assembly:  Microsoft.SqlServer.Smo (em Microsoft.SqlServer.Smo.dll)

Sintaxe

'Declaração
Public NotInheritable Class Column _
    Inherits ScriptNameObjectBase _
    Implements ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable,  _
    IMarkForDrop, IExtendedProperties, IRenamable
'Uso
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

O tipo Column expõe os membros a seguir.

Construtores

	Nome	Descrição
	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.

Início

Propriedades

	Nome	Descrição
	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 Usar colunas esparsas.
	Name	Gets or sets a String value that specifies the name of the column. (Substitui 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. (Herdado de 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. (Herdado de 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. (Herdado de SqlSmoObject.)
	UserData	Gets or sets user-defined data associated with the referenced object. (Herdado de SmoObjectBase.)

Início

Métodos

	Nome	Descrição
	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. (Herdado de 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	(Herdado de Object.)
	FormatSqlVariant	Formats an object as SqlVariant type. (Herdado de SqlSmoObject.)
	GetContextDB	Gets the context database that is associated with this object. (Herdado de SqlSmoObject.)
	GetDBName	Gets the database name that is associated with the object. (Herdado de SqlSmoObject.)
	GetHashCode	(Herdado de Object.)
	GetPropValue	Gets a property value of the SqlSmoObject object. (Herdado de SqlSmoObject.)
	GetPropValueOptional	Gets a property value of the SqlSmoObject object. (Herdado de SqlSmoObject.)
	GetPropValueOptionalAllowNull	Gets a property value of the SqlSmoObject object. (Herdado de SqlSmoObject.)
	GetServerObject	Gets the server of the SqlSmoObject object. (Herdado de SqlSmoObject.)
	GetType	(Herdado de Object.)
	Initialize()	Initializes the object and forces the properties be loaded. (Herdado de SqlSmoObject.)
	Initialize(Boolean)	Initializes the object and forces the properties be loaded. (Herdado de SqlSmoObject.)
	IsObjectInitialized	Verifies whether the object has been initialized. (Herdado de SqlSmoObject.)
	IsObjectInSpace	Verifies whether the object is isolated or connected to the instance of SQL Server. (Herdado de 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. (Substitui ScriptNameObjectBase.Refresh().)
	Rename	Renames the column.
	SetParentImpl	Sets the parent of the SqlSmoObject to the newParent parameter. (Herdado de SqlSmoObject.)
	ToString	Returns a String that represents the referenced object. (Herdado de 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. (Herdado de SmoObjectBase.)

Início

Eventos

	Nome	Descrição
	PropertyChanged	Represents the event that occurs when a property is changed. (Herdado de SqlSmoObject.)
	PropertyMetadataChanged	Represents the event that occurs when property metadata changes. (Herdado de SqlSmoObject.)

Início

Implementações de interfaces explícitas

	Nome	Descrição
	IAlienObject.Discover	Discovers any dependencies. Não referencie esse membro diretamente no código. Ele dá suporte à infraestrutura do SQL Server. (Herdado de SqlSmoObject.)
	IAlienObject.GetDomainRoot	Returns the root of the domain. (Herdado de SqlSmoObject.)
	IAlienObject.GetParent	Gets the parent of this object. Não referencie esse membro diretamente no código. Ele dá suporte à infraestrutura do SQL Server. (Herdado de SqlSmoObject.)
	IAlienObject.GetPropertyType	Gets the type of the specified property. (Herdado de SqlSmoObject.)
	IAlienObject.GetPropertyValue	Gets the value of the specified property. (Herdado de SqlSmoObject.)
	IAlienObject.GetUrn	Gets the Unified Resource Name (URN) of the object. Não referencie esse membro diretamente no código. Ele dá suporte à infraestrutura do SQL Server. (Herdado de SqlSmoObject.)
	IAlienObject.Resolve	Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. (Herdado de SqlSmoObject.)
	IAlienObject.SetObjectState	Sets the object state to the specified SfcObjectState value. (Herdado de SqlSmoObject.)
	IAlienObject.SetPropertyValue	Sets the property value. (Herdado de SqlSmoObject.)
	ISfcPropertyProvider.GetPropertySet	Gets the interface reference to the set of properties of this object. (Herdado de SqlSmoObject.)
	ISfcSupportsDesignMode.IsDesignMode	Gets a Boolean value that specifies whether the column supports design mode.

Início

Comentários

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

Qualquer membro público estático (Compartilhado no Microsoft Visual Basic) desse tipo é seguro para operações multi-threaded. Não há garantia de que qualquer membro de instância seja seguro para threads.

Exemplos

Trabalhando com objetos de banco de dados

Segurança de thread

Qualquer membro público static (Shared no Visual Basic) desse tipo é seguro para threads. Não há garantia de que qualquer membro de instância seja seguro para threads.

Consulte também

Referência

Namespace Microsoft.SqlServer.Management.Smo

Outros recursos

CREATE TABLE (Transact-SQL)