User 类

The User object represents a SQL Server user.

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

语法

声明
<EvaluationModeAttribute(AutomatedPolicyEvaluationMode.None Or AutomatedPolicyEvaluationMode.Enforce Or AutomatedPolicyEvaluationMode.CheckOnChanges Or AutomatedPolicyEvaluationMode.CheckOnSchedule)> _
<StateChangeEventAttribute("CREATE_USER", "USER", "GROUP USER")> _
<StateChangeEventAttribute("CREATE_USER", "USER", "SQL USER")> _
<StateChangeEventAttribute("ALTER_USER", "USER", "SQL USER")> _
<StateChangeEventAttribute("CREATE_USER", "USER", "WINDOWS USER")> _
<StateChangeEventAttribute("ALTER_USER", "USER", "WINDOWS USER")> _
<StateChangeEventAttribute("ALTER_USER", "USER", "CERTIFICATE USER")> _
<PhysicalFacetAttribute> _
<StateChangeEventAttribute("CREATE_USER", "USER", "CERTIFICATE USER")> _
<StateChangeEventAttribute("ALTER_USER", "USER", "GROUP USER")> _
<StateChangeEventAttribute("CREATE_USER", "USER", "ASYMMETRIC KEY USER")> _
<StateChangeEventAttribute("ALTER_USER", "USER", "ASYMMETRIC KEY USER")> _
Public NotInheritable Class User _
    Inherits ScriptNameObjectBase _
    Implements IObjectPermission, ICreatable, IDroppable, IAlterable,  _
    IRenamable, IExtendedProperties, IScriptable
用法
Dim instance As User
[EvaluationModeAttribute(AutomatedPolicyEvaluationMode.None|AutomatedPolicyEvaluationMode.Enforce|AutomatedPolicyEvaluationMode.CheckOnChanges|AutomatedPolicyEvaluationMode.CheckOnSchedule)]
[StateChangeEventAttribute("CREATE_USER", "USER", "GROUP USER")]
[StateChangeEventAttribute("CREATE_USER", "USER", "SQL USER")]
[StateChangeEventAttribute("ALTER_USER", "USER", "SQL USER")]
[StateChangeEventAttribute("CREATE_USER", "USER", "WINDOWS USER")]
[StateChangeEventAttribute("ALTER_USER", "USER", "WINDOWS USER")]
[StateChangeEventAttribute("ALTER_USER", "USER", "CERTIFICATE USER")]
[PhysicalFacetAttribute]
[StateChangeEventAttribute("CREATE_USER", "USER", "CERTIFICATE USER")]
[StateChangeEventAttribute("ALTER_USER", "USER", "GROUP USER")]
[StateChangeEventAttribute("CREATE_USER", "USER", "ASYMMETRIC KEY USER")]
[StateChangeEventAttribute("ALTER_USER", "USER", "ASYMMETRIC KEY USER")]
public sealed class User : ScriptNameObjectBase, IObjectPermission, 
    ICreatable, IDroppable, IAlterable, IRenamable, IExtendedProperties, 
    IScriptable
[EvaluationModeAttribute(AutomatedPolicyEvaluationMode::None|AutomatedPolicyEvaluationMode::Enforce|AutomatedPolicyEvaluationMode::CheckOnChanges|AutomatedPolicyEvaluationMode::CheckOnSchedule)]
[StateChangeEventAttribute(L"CREATE_USER", L"USER", L"GROUP USER")]
[StateChangeEventAttribute(L"CREATE_USER", L"USER", L"SQL USER")]
[StateChangeEventAttribute(L"ALTER_USER", L"USER", L"SQL USER")]
[StateChangeEventAttribute(L"CREATE_USER", L"USER", L"WINDOWS USER")]
[StateChangeEventAttribute(L"ALTER_USER", L"USER", L"WINDOWS USER")]
[StateChangeEventAttribute(L"ALTER_USER", L"USER", L"CERTIFICATE USER")]
[PhysicalFacetAttribute]
[StateChangeEventAttribute(L"CREATE_USER", L"USER", L"CERTIFICATE USER")]
[StateChangeEventAttribute(L"ALTER_USER", L"USER", L"GROUP USER")]
[StateChangeEventAttribute(L"CREATE_USER", L"USER", L"ASYMMETRIC KEY USER")]
[StateChangeEventAttribute(L"ALTER_USER", L"USER", L"ASYMMETRIC KEY USER")]
public ref class User sealed : public ScriptNameObjectBase, 
    IObjectPermission, ICreatable, IDroppable, IAlterable, IRenamable, 
    IExtendedProperties, IScriptable
[<SealedAttribute>]
[<EvaluationModeAttribute(AutomatedPolicyEvaluationMode.None|AutomatedPolicyEvaluationMode.Enforce|AutomatedPolicyEvaluationMode.CheckOnChanges|AutomatedPolicyEvaluationMode.CheckOnSchedule)>]
[<StateChangeEventAttribute("CREATE_USER", "USER", "GROUP USER")>]
[<StateChangeEventAttribute("CREATE_USER", "USER", "SQL USER")>]
[<StateChangeEventAttribute("ALTER_USER", "USER", "SQL USER")>]
[<StateChangeEventAttribute("CREATE_USER", "USER", "WINDOWS USER")>]
[<StateChangeEventAttribute("ALTER_USER", "USER", "WINDOWS USER")>]
[<StateChangeEventAttribute("ALTER_USER", "USER", "CERTIFICATE USER")>]
[<PhysicalFacetAttribute>]
[<StateChangeEventAttribute("CREATE_USER", "USER", "CERTIFICATE USER")>]
[<StateChangeEventAttribute("ALTER_USER", "USER", "GROUP USER")>]
[<StateChangeEventAttribute("CREATE_USER", "USER", "ASYMMETRIC KEY USER")>]
[<StateChangeEventAttribute("ALTER_USER", "USER", "ASYMMETRIC KEY USER")>]
type User =  
    class
        inherit ScriptNameObjectBase
        interface IObjectPermission
        interface ICreatable
        interface IDroppable
        interface IAlterable
        interface IRenamable
        interface IExtendedProperties
        interface IScriptable
    end
public final class User extends ScriptNameObjectBase implements IObjectPermission, ICreatable, IDroppable, IAlterable, IRenamable, IExtendedProperties, IScriptable

User 类型公开以下成员。

构造函数

  名称 说明
公共方法 User() () () () Initializes a new instance of the User class.
公共方法 User(Database, String) Initializes a new instance of the User class on the specified database with the specified name.

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属性

  名称 说明
公共属性 AsymmetricKey Gets or sets the asymmetric key for the user.
公共属性 Certificate Gets or sets the certificate for the user.
公共属性 CreateDate Gets the date and time when the database user was created.
公共属性 DateLastModified Gets the date and time when the database user was last modified.
公共属性 DefaultSchema Gets the default schema for the database user.
公共属性 Events Gets the events that are associated with the database user.
受保护属性 ExecuteForScalar Gets or sets the Boolean property value that specifies whether the object is set to the execute for scalar option. (从 SqlSmoObject 继承。)
公共属性 ExtendedProperties Gets the extended properties of the database user.
公共属性 HasDBAccess Gets the Boolean property that specifies whether the database user has access to the database.
公共属性 ID Gets the ID value that uniquely identifies the database user.
公共属性 IsSystemObject Gets the Boolean property that specifies whether the database user is a system object.
受保护属性 IsTouched Gets the Boolean property value that specifies whether the object properties have been updated but not yet persisted on the server. (从 SqlSmoObject 继承。)
公共属性 Login Gets the login that is associated with the database user.
公共属性 LoginType Gets the type of login that is associated with the database user, such as whether it is a Windows group or a SQL Server standard login.
公共属性 Name Gets or sets the name of the object. (从 NamedSmoObject 继承。)
受保护属性 ObjectInSpace Gets the Boolean property value that specifies whether the object exists in isolation, or whether it is directly or indirectly connected to the instance of SQL Server. (从 SqlSmoObject 继承。)
公共属性 Parent Gets the Database object that is the parent of the User object.
公共属性 Properties Gets a collection of Property objects that represent the object properties. (从 SqlSmoObject 继承。)
受保护属性 ScalarResult Gets the scalar result for the referenced object. (从 SqlSmoObject 继承。)
公共属性 Sid Gets the security identification number (SID) value of the database user.
公共属性 State Gets the state of the referenced object. (从 SmoObjectBase 继承。)
公共属性 Urn Gets the Uniform Resource Name (URN) address value that uniquely identifies the object. (从 SqlSmoObject 继承。)
公共属性 UserData Gets or sets user-defined data associated with the referenced object. (从 SmoObjectBase 继承。)
公共属性 UserType Gets or sets the type of user.

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方法

  名称 说明
受保护方法 AddDatabaseContext (从 SqlSmoObject 继承。)
公共方法 AddToRole Adds the database user to the specified role.
公共方法 Alter Updates any User object property changes on the instance of Microsoft SQL Server. 
受保护方法 AlterImpl (从 SqlSmoObject 继承。)
受保护方法 AlterImplFinish (从 SqlSmoObject 继承。)
受保护方法 AlterImplInit (从 SqlSmoObject 继承。)
受保护方法 AlterImplWorker (从 SqlSmoObject 继承。)
受保护方法 AppendCommaText (从 ScriptNameObjectBase 继承。)
受保护方法 AppendWithCommaText (从 ScriptNameObjectBase 继承。)
受保护方法 AppendWithOption (从 ScriptNameObjectBase 继承。)
受保护方法 BindDefaultImpl (从 SqlSmoObject 继承。)
受保护方法 BindRuleImpl (从 SqlSmoObject 继承。)
受保护方法 CheckCollation (从 SqlSmoObject 继承。)
受保护方法 CheckObjectDirty (从 ScriptNameObjectBase 继承。)
受保护方法 CheckObjectState() () () () Validates the state of the referenced object. (从 SqlSmoObject 继承。)
受保护方法 CheckObjectState(Boolean) Validates the state of the referenced object with the option to specify that an exception is thrown if the object is not yet created. (从 SqlSmoObject 继承。)
受保护方法 CheckObjectStateImpl (从 SqlSmoObject 继承。)
受保护方法 CheckTextCorectness (从 ScriptNameObjectBase 继承。)
受保护方法 CheckTextModeSupport (从 ScriptNameObjectBase 继承。)
受保护方法 CheckVersion100 (从 SqlSmoObject 继承。)
受保护方法 CheckVersion80 Checks the validity of the object on SQL Server 2000. (从 SqlSmoObject 继承。)
受保护方法 CheckVersion80SP3 Checks the validity of the object on SQL Server 2000 SP3. (从 SqlSmoObject 继承。)
受保护方法 CheckVersion90 Check the validity of the object on SQL Server 2005. (从 SqlSmoObject 继承。)
受保护方法 CheckVersionBelow90 (从 SqlSmoObject 继承。)
受保护方法 CleanObject Cleans the referenced object. (从 ScriptNameObjectBase 继承。)
公共方法 Create Creates a database user on the instance of SQL Server as defined by the User object.
受保护方法 CreateImpl (从 SqlSmoObject 继承。)
受保护方法 CreateImplFinish (从 SqlSmoObject 继承。)
受保护方法 CreateImplInit (从 SqlSmoObject 继承。)
公共方法 Deny(ObjectPermissionSet, String) Denies access to the specified permission for the specified grantee on the database user.
公共方法 Deny(ObjectPermissionSet, array<String> [] () [] []) Denies access to the specified permission for the specified grantees on the database user.
公共方法 Deny(ObjectPermissionSet, String, Boolean) Denies access to the specified permission for the specified grantee and other users whom the grantee granted access on the database user.
公共方法 Deny(ObjectPermissionSet, array<String> [] () [] [], Boolean) Denies access to the specified permission for the specified grantees on the database user.
公共方法 Discover (从 SqlSmoObject 继承。)
公共方法 Drop Removes the user from the database.
受保护方法 DropImpl (从 SqlSmoObject 继承。)
受保护方法 DropImplWorker (从 SqlSmoObject 继承。)
公共方法 EnumObjectPermissions() () () () Enumerates a list of object permissions for the database user.
公共方法 EnumObjectPermissions(String) Enumerates a list of object permissions for a specified grantee on the database user.
公共方法 EnumObjectPermissions(ObjectPermissionSet) Enumerates a list of object permissions for a specified permission on the database user.
公共方法 EnumObjectPermissions(String, ObjectPermissionSet) Enumerates a list of object permissions for a specified grantee and a specified permission on the database user.
公共方法 EnumOwnedObjects Enumerates a list of object that the database user owns.
公共方法 EnumRoles Enumerates a list of roles of which the database user is a member.
受保护方法 EnumScriptImpl (从 SqlSmoObject 继承。)
受保护方法 EnumScriptImplWorker (从 SqlSmoObject 继承。)
公共方法 Equals (从 Object 继承。)
受保护方法 Finalize (从 Object 继承。)
受保护方法 ForceTextModeOnTextBody Enforces text mode on the text body. (从 ScriptNameObjectBase 继承。)
受保护方法 FormatSqlVariant (从 SqlSmoObject 继承。)
受保护方法 GenerateDataSpaceFileStreamScript (从 SqlSmoObject 继承。)
受保护方法 GenerateDataSpaceScript (从 SqlSmoObject 继承。)
受保护方法 GetBindDefaultScript (从 SqlSmoObject 继承。)
受保护方法 GetBindRuleScript (从 SqlSmoObject 继承。)
受保护方法 GetBoolParameter(StringBuilder, ScriptingOptions, String, String, Int32%) (从 SqlSmoObject 继承。)
受保护方法 GetBoolParameter(StringBuilder, ScriptingOptions, String, String, Int32%, Boolean) (从 SqlSmoObject 继承。)
受保护方法 GetBraketNameForText (从 ScriptNameObjectBase 继承。)
受保护方法 GetDateTimeParameter (从 SqlSmoObject 继承。)
受保护方法 GetDateTimeParameterAsInt (从 SqlSmoObject 继承。)
受保护方法 GetDBName Gets the database name that is associated with the object. (从 SqlSmoObject 继承。)
受保护方法 GetEnumParameter (从 SqlSmoObject 继承。)
受保护方法 GetFragOptionString (从 SqlSmoObject 继承。)
受保护方法 GetGuidParameter (从 SqlSmoObject 继承。)
公共方法 GetHashCode (从 Object 继承。)
受保护方法 GetIsTextDirty Determines whether the text value is consistent with stored value. (从 ScriptNameObjectBase 继承。)
受保护方法 GetParameter(StringBuilder, ScriptingOptions, String, String, Int32%) (从 SqlSmoObject 继承。)
受保护方法 GetParameter(StringBuilder, ScriptingOptions, String, String, Int32%, Boolean) (从 SqlSmoObject 继承。)
受保护方法 GetPropValue (从 SqlSmoObject 继承。)
受保护方法 GetPropValueOptional (从 SqlSmoObject 继承。)
受保护方法 GetPropValueOptionalAllowNull (从 SqlSmoObject 继承。)
受保护方法 GetRealValue (从 SqlSmoObject 继承。)
受保护方法 GetScriptIncludeExists (从 ScriptNameObjectBase 继承。)
受保护方法 GetScriptingOptionsForCreate (从 SqlSmoObject 继承。)
受保护方法 GetServerName Gets the name of the instance of SQL Server with which the object is associated. (从 SqlSmoObject 继承。)
受保护方法 GetServerObject (从 SqlSmoObject 继承。)
受保护方法 GetSqlServerVersionName Gets the version name of the instance of SQL Server with which the object is associated. (从 SqlSmoObject 继承。)
受保护方法 GetStringParameter(StringBuilder, ScriptingOptions, String, String, Int32%) (从 SqlSmoObject 继承。)
受保护方法 GetStringParameter(StringBuilder, ScriptingOptions, String, String, Int32%, Boolean) (从 SqlSmoObject 继承。)
受保护方法 GetTextBody() () () () Returns the text body. (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextBody(Boolean) Returns the text body. (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextForScript(ScriptingOptions, Boolean, array<String> [] () [] []) Gets the text for scripting. (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextForScript(ScriptingOptions, Boolean, array<String> [] () [] [], Boolean) (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextHeader Returns the text header. (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextMode Determines whether the script name is using text mode. (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextProperty(String) (从 ScriptNameObjectBase 继承。)
受保护方法 GetTextProperty(String, ScriptingOptions) (从 ScriptNameObjectBase 继承。)
受保护方法 GetTimeSpanParameterAsInt (从 SqlSmoObject 继承。)
公共方法 GetType (从 Object 继承。)
受保护方法 GetUrnRecursive(StringBuilder) (从 SqlSmoObject 继承。)
受保护方法 GetUrnRecursive(StringBuilder, UrnIdOption) (从 SqlSmoObject 继承。)
公共方法 Grant(ObjectPermissionSet, String) Grants access to the specified permission for the specified grantee on the database user.
公共方法 Grant(ObjectPermissionSet, array<String> [] () [] []) Grants access to the specified permission for the specified grantees on the database user.
公共方法 Grant(ObjectPermissionSet, String, Boolean) Grants access to the specified permission and the ability to grant access to other users for the specified grantee on the database user.
公共方法 Grant(ObjectPermissionSet, array<String> [] () [] [], Boolean) Grants access to the specified permission and the ability to grant access to other users for the specified grantees on the database user.
公共方法 Grant(ObjectPermissionSet, String, Boolean, String) Grants access to the specified permission and the ability to grant access to other users for the specified grantee on the database user.
公共方法 Grant(ObjectPermissionSet, array<String> [] () [] [], Boolean, String) Grants access to the specified permission and the ability to grant access to other users for the specified grantee on the database user under an assumed role.
受保护方法 ImplInitialize (从 SqlSmoObject 继承。)
公共方法 Initialize() () () () Initializes the object and forces the properties be loaded. (从 SqlSmoObject 继承。)
公共方法 Initialize(Boolean) Initializes the object and forces the properties be loaded. (从 SqlSmoObject 继承。)
公共方法 IsMember Verifies whether the database user is a member of the specified role.
受保护方法 IsObjectDirty Determines whether the referenced object is consistent with the stored object. (从 ScriptNameObjectBase 继承。)
受保护方法 IsObjectInitialized Verifies whether the object has been initialized. (从 SqlSmoObject 继承。)
受保护方法 IsObjectInSpace Verifies whether the object is isolated or connected to the instance of SQL Server. (从 SqlSmoObject 继承。)
受保护方法 IsVersion80SP3 (从 SqlSmoObject 继承。)
受保护方法 MarkDropped (从 SqlSmoObject 继承。)
受保护方法 MarkForDropImpl (从 SqlSmoObject 继承。)
受保护方法 MemberwiseClone (从 Object 继承。)
受保护方法 PostAlter (从 SqlSmoObject 继承。)
受保护方法 PostCreate (从 SqlSmoObject 继承。)
受保护方法 PostDrop (从 SqlSmoObject 继承。)
公共方法 Refresh Refreshes the script name. (从 ScriptNameObjectBase 继承。)
公共方法 Rename Renames the database user.
受保护方法 RenameImpl This method supports the SMO infrastructure and is not intended to be used directly from your code. (从 NamedSmoObject 继承。)
受保护方法 RenameImplWorker This method supports the SMO infrastructure and is not intended to be used directly from your code. (从 NamedSmoObject 继承。)
公共方法 Revoke(ObjectPermissionSet, String) Revokes previously granted permissions from a grantee on the database user.
公共方法 Revoke(ObjectPermissionSet, array<String> [] () [] []) Revokes previously granted permissions from a list of grantees on the database user.
公共方法 Revoke(ObjectPermissionSet, String, Boolean, Boolean) Revokes previously granted permissions from a grantee on the database user and any other users to whom the grantee has granted access. The grantee is also given the ability to revoke other users' access.
公共方法 Revoke(ObjectPermissionSet, array<String> [] () [] [], Boolean, Boolean) Revokes previously granted permissions from the grantees on the database user and any other users to whom the grantees have granted access. The grantees are also given the ability to revoke other users' access.
公共方法 Revoke(ObjectPermissionSet, String, Boolean, Boolean, String) Revokes previously granted permissions from a grantee on the database user and any other users to whom the grantee has granted access. The grantee is also given the ability to revoke other users' access under an assumed role.
公共方法 Revoke(ObjectPermissionSet, array<String> [] () [] [], Boolean, Boolean, String) Revokes previously granted permissions from grantees on the database user and any other users to whom the grantees have granted access. The grantees are also given the ability to revoke other users' access under an assumed role.
公共方法 Script() () () () Generates a Transact-SQL script that can be used to re-create the database user.
公共方法 Script(ScriptingOptions) Generates a Transact-SQL script that can be used to re-create the database user as specified by the script options.
受保护方法 ScriptAlter (从 SqlSmoObject 继承。)
受保护方法 ScriptAnsiQI (从 ScriptNameObjectBase 继承。)
受保护方法 ScriptChangeOwner This method supports the SMO infrastructure and is not intended to be used directly from your code. (从 NamedSmoObject 继承。)
受保护方法 ScriptCreate (从 SqlSmoObject 继承。)
受保护方法 ScriptDdl (从 SqlSmoObject 继承。)
受保护方法 ScriptDrop (从 SqlSmoObject 继承。)
受保护方法 ScriptImpl() () () () (从 SqlSmoObject 继承。)
受保护方法 ScriptImpl(ScriptingOptions) (从 SqlSmoObject 继承。)
受保护方法 ScriptImplWorker (从 SqlSmoObject 继承。)
受保护方法 ScriptInformativeHeaders (从 ScriptNameObjectBase 继承。)
受保护方法 ScriptRename This method supports the SMO infrastructure and is not intended to be used directly from your code. (从 NamedSmoObject 继承。)
受保护方法 SetCollectionTextMode Sets the collection text mode. (从 ScriptNameObjectBase 继承。)
受保护方法 SetParentImpl (从 SqlSmoObject 继承。)
受保护方法 SetTextBody Specifies the text body. (从 ScriptNameObjectBase 继承。)
受保护方法 SetTextHeader Specifies the text header. (从 ScriptNameObjectBase 继承。)
受保护方法 SetTextMode Specifies the text mode. (从 ScriptNameObjectBase 继承。)
受保护方法 SwitchTextMode Switches the text mode. (从 ScriptNameObjectBase 继承。)
受保护方法 ThrowIfTextIsDirtyForAlter (从 ScriptNameObjectBase 继承。)
公共方法 ToString Returns a String that represents the referenced object. (从 SqlSmoObject 继承。)
受保护方法 TouchImpl (从 SqlSmoObject 继承。)
受保护方法 UnbindDefaultImpl (从 SqlSmoObject 继承。)
受保护方法 UnbindRuleImpl (从 SqlSmoObject 继承。)
公共方法 Validate (从 SmoObjectBase 继承。)

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事件

  名称 说明
公共事件 PropertyChanged (从 SqlSmoObject 继承。)
公共事件 PropertyMetadataChanged (从 SqlSmoObject 继承。)

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字段

  名称 说明
受保护字段 m_ExtendedProperties (从 SqlSmoObject 继承。)

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显式接口实现

  名称 说明
显式接口实现私有方法 IAlienObjectDiscover (从 SqlSmoObject 继承。)
显式接口实现私有方法 IAlienObjectGetParent (从 SqlSmoObject 继承。)
显式接口实现私有方法 IAlienObjectGetProperty (从 SqlSmoObject 继承。)
显式接口实现私有方法 ISfcPropertyProviderGetPropertySet (从 SqlSmoObject 继承。)
显式接口实现私有方法 IAlienObjectGetUrn (从 SqlSmoObject 继承。)
显式接口实现私有方法 IAlienObjectResolve (从 SqlSmoObject 继承。)
显式接口实现私有方法 IAlienObjectSetProperty (从 SqlSmoObject 继承。)

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注释

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

To set User object properties, uses must have ALTE ANY USER permission on the database or be a member of the db_owner fixed database role.

To change the default schema, users must have ALTER permission on the specified user or be the owner of the user.

To create or drop a user, users must have ALTER ANY USER permission on the fixed server role or be a member of the db_owner fixed database role.

To grant, deny, or revoke permission on the specified user to other users, users must have CONTROL permission on the specified user.

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。 不保证所有实例成员都对于线程安全的。

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。