Anteckning
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Indicates whether a SQL Server 2005 login is a member of the specified fixed server role.
Transact-SQL Syntax Conventions
Syntax
IS_SRVROLEMEMBER ('role' [ , 'login' ] )
Arguments
'role'
Is the name of the server role that is being checked. role is sysname.Valid values for role include the following:
sysadmin
- dbcreator
 - bulkadmin
 - diskadmin
 - processadmin
 - serveradmin
 - setupadmin
 - securityadmin
 
- 'login'
Is the name of the SQL Server 2005 login to check. login is sysname, with a default of NULL. If no value is specified, the SQL Server login of the current user is used. 
Return Types
int
Remarks
IS_SRVROLEMEMBER returns the following values.
| Return value | Description | 
|---|---|
0  | 
login is not a member of role.  | 
1  | 
login is a member of role.  | 
NULL  | 
role or login is not valid.  | 
Use this function to determine whether the current user can perform an action requiring the server role's permissions.
If a Microsoft Windows login, such as London\JoeB, is specified for login, IS_SRVROLEMEMBER returns NULL, unless the login has been granted or denied direct access to SQL Server 2005.
If login is a Windows domain login, it may be a member of a fixed server role through membership in a Windows group. To resolve such indirect memberships, IS_SRVROLEMEMBER requests Windows group membership information from the domain controller. If the domain controller is not accessible or does not respond, IS_SRVROLEMEMBER returns role membership information taking into account the user and its local groups only.
Examples
The following example indicates whether the SQL Server login for the current user is a member of the sysadmin fixed server role.
IF IS_SRVROLEMEMBER ('sysadmin') = 1
   print 'Current user''s login is a member of the sysadmin role'
ELSE IF IS_SRVROLEMEMBER ('sysadmin') = 0
   print 'Current user''s login is NOT a member of the sysadmin role'
ELSE IF IS_SRVROLEMEMBER ('sysadmin') IS NULL
   print 'ERROR: The server role specified is not valid.'
See Also
Reference
IS_MEMBER (Transact-SQL)
Security Functions (Transact-SQL)