Класс Column
The Column object represents a SQL Server column.
Иерархия наследования
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
Пространство имен: Microsoft.SqlServer.Management.Smo
Сборка: Microsoft.SqlServer.Smo (в Microsoft.SqlServer.Smo.dll)
Синтаксис
'Декларация
Public NotInheritable Class Column _
Inherits ScriptNameObjectBase _
Implements ISfcSupportsDesignMode, ICreatable, IAlterable, IDroppable, _
IMarkForDrop, IExtendedProperties, IRenamable
'Применение
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
Тип Column обеспечивает доступ к следующим элементам.
Конструкторы
Имя | Описание | |
---|---|---|
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. |
В начало
Свойства
Имя | Описание | |
---|---|---|
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 Использование разреженных столбцов. | |
Name | Gets or sets a String value that specifies the name of the column. (Переопределяет 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. (Производный от 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. (Производный от 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. (Производный от SqlSmoObject.) | |
UserData | Gets or sets user-defined data associated with the referenced object. (Производный от SmoObjectBase.) |
В начало
Методы
Имя | Описание | |
---|---|---|
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. (Производный от 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 | (Производный от Object.) | |
FormatSqlVariant | Formats an object as SqlVariant type. (Производный от SqlSmoObject.) | |
GetContextDB | Gets the context database that is associated with this object. (Производный от SqlSmoObject.) | |
GetDBName | Gets the database name that is associated with the object. (Производный от SqlSmoObject.) | |
GetHashCode | (Производный от Object.) | |
GetPropValue | Gets a property value of the SqlSmoObject object. (Производный от SqlSmoObject.) | |
GetPropValueOptional | Gets a property value of the SqlSmoObject object. (Производный от SqlSmoObject.) | |
GetPropValueOptionalAllowNull | Gets a property value of the SqlSmoObject object. (Производный от SqlSmoObject.) | |
GetServerObject | Gets the server of the SqlSmoObject object. (Производный от SqlSmoObject.) | |
GetType | (Производный от Object.) | |
Initialize() | Initializes the object and forces the properties be loaded. (Производный от SqlSmoObject.) | |
Initialize(Boolean) | Initializes the object and forces the properties be loaded. (Производный от SqlSmoObject.) | |
IsObjectInitialized | Verifies whether the object has been initialized. (Производный от SqlSmoObject.) | |
IsObjectInSpace | Verifies whether the object is isolated or connected to the instance of SQL Server. (Производный от 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. (Переопределяет ScriptNameObjectBase.Refresh().) | |
Rename | Renames the column. | |
SetParentImpl | Sets the parent of the SqlSmoObject to the newParent parameter. (Производный от SqlSmoObject.) | |
ToString | Returns a String that represents the referenced object. (Производный от 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. (Производный от SmoObjectBase.) |
В начало
События
Имя | Описание | |
---|---|---|
PropertyChanged | Represents the event that occurs when a property is changed. (Производный от SqlSmoObject.) | |
PropertyMetadataChanged | Represents the event that occurs when property metadata changes. (Производный от SqlSmoObject.) |
В начало
Явные реализации интерфейса
Имя | Описание | |
---|---|---|
IAlienObject.Discover | Discovers any dependencies. Не ссылайтесь на этот элемент непосредственно из кода. Он поддерживает работу инфраструктуры SQL Server. (Производный от SqlSmoObject.) | |
IAlienObject.GetDomainRoot | Returns the root of the domain. (Производный от SqlSmoObject.) | |
IAlienObject.GetParent | Gets the parent of this object. Не ссылайтесь на этот элемент непосредственно из кода. Он поддерживает работу инфраструктуры SQL Server. (Производный от SqlSmoObject.) | |
IAlienObject.GetPropertyType | Gets the type of the specified property. (Производный от SqlSmoObject.) | |
IAlienObject.GetPropertyValue | Gets the value of the specified property. (Производный от SqlSmoObject.) | |
IAlienObject.GetUrn | Gets the Unified Resource Name (URN) of the object. Не ссылайтесь на этот элемент непосредственно из кода. Он поддерживает работу инфраструктуры SQL Server. (Производный от SqlSmoObject.) | |
IAlienObject.Resolve | Gets the instance that contains the information about the object from the Unified Resource Name (URN) of the object. (Производный от SqlSmoObject.) | |
IAlienObject.SetObjectState | Sets the object state to the specified SfcObjectState value. (Производный от SqlSmoObject.) | |
IAlienObject.SetPropertyValue | Sets the property value. (Производный от SqlSmoObject.) | |
ISfcPropertyProvider.GetPropertySet | Gets the interface reference to the set of properties of this object. (Производный от SqlSmoObject.) | |
ISfcSupportsDesignMode.IsDesignMode | Gets a Boolean value that specifies whether the column supports design mode. |
В начало
Замечания
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
Все общие статические члены этого типа (Shared в Microsoft Visual Basic) можно использовать в многопоточных операциях. Потокобезопасная работа с членами экземпляров типа не гарантируется.
Примеры
Работа с объектами базы данных
Безопасность многопоточности
Любые открытые статический (Shared в Visual Basic) элементы этого типа потокобезопасны. Потокобезопасность с элементами экземпляров не гарантируется.
См. также
Справочник
Пространство имен Microsoft.SqlServer.Management.Smo