Column 类

The Column object represents a SQL Server column.

继承层次结构

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

命名空间：  Microsoft.SqlServer.Management.Smo
程序集：  Microsoft.SqlServer.Smo（在 Microsoft.SqlServer.Smo.dll 中）

语法

声明
Public NotInheritable Class Column _
    Inherits ScriptNameObjectBase _
    Implements ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable,  _
    IMarkForDrop, IExtendedProperties, IRenamable
用法
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

Column 类型公开以下成员。

构造函数

	名称	说明
	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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属性

	名称	说明
	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 使用稀疏列.
	Name	Gets or sets a String value that specifies the name of the column. （覆盖 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. （从 SqlSmoObject 继承。）
	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. （从 SmoObjectBase 继承。）
	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. （从 SqlSmoObject 继承。）
	UserData	Gets or sets user-defined data associated with the referenced object. （从 SmoObjectBase 继承。）

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方法

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

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事件

	名称	说明
	PropertyChanged	Represents the event that occurs when a property is changed. （从 SqlSmoObject 继承。）
	PropertyMetadataChanged	Represents the event that occurs when property metadata changes. （从 SqlSmoObject 继承。）

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显式接口实现

	名称	说明
	IAlienObject.Discover	Discovers any dependencies. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.GetDomainRoot	Returns the root of the domain. （从 SqlSmoObject 继承。）
	IAlienObject.GetParent	Gets the parent of this object. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.GetPropertyType	Gets the type of the specified property. （从 SqlSmoObject 继承。）
	IAlienObject.GetPropertyValue	Gets the value of the specified property. （从 SqlSmoObject 继承。）
	IAlienObject.GetUrn	Gets the Unified Resource Name (URN) of the object. 不要在您的代码中直接引用此成员。它支持 SQL Server 基础结构。 （从 SqlSmoObject 继承。）
	IAlienObject.Resolve	Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. （从 SqlSmoObject 继承。）
	IAlienObject.SetObjectState	Sets the object state to the specified SfcObjectState value. （从 SqlSmoObject 继承。）
	IAlienObject.SetPropertyValue	Sets the property value. （从 SqlSmoObject 继承。）
	ISfcPropertyProvider.GetPropertySet	Gets the interface reference to the set of properties of this object. （从 SqlSmoObject 继承。）
	ISfcSupportsDesignMode.IsDesignMode	Gets a Boolean value that specifies whether the column supports design mode.

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注释

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

此类型的任何公共静态（Microsoft Visual Basic 中的 Shared）成员在多线程操作中是安全的。但不保证所有实例成员都是线程安全的。

示例

使用数据库对象

线程安全

此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。不保证所有实例成员都是线程安全的。

请参阅

参考

Microsoft.SqlServer.Management.Smo 命名空间

其他资源

CREATE TABLE (Transact-SQL)