sp_helprole (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_helprole(nvarchar @rolename)

MetaData:

 create procedure sys.sp_helprole  
    @rolename       sysname = NULL  
AS  
    if @rolename is not null  
    begin  
        --  VALIDATE GIVEN NAME  
        if not exists (select * from sys.database_principals where name = @rolename and (type = 'R' or type = 'A'))  
        begin  
            raiserror(15409, -1, -1, @rolename)  
            return (1)  
        end  
  
        --  RESULT SET FOR SINGLE ROLE  
        select 'RoleName' = name, 'RoleId' = principal_id, 'IsAppRole' = case type when 'A' then 1 else 0 end  
            from sys.database_principals  
            where (name = @rolename) and (type = 'R' or type = 'A')  
    end  
    else  
    begin  
        --  RESULT SET FOR ALL ROLES  
        select 'RoleName' = name, 'RoleId' = principal_id, 'IsAppRole' = case type when 'A' then 1 else 0 end  
            from sys.database_principals where (type = 'R' or type = 'A')  
    end  
  
    return (0) --  sp_helprole