Chapter 2: Transact-SQL Functions

has_role

Returns information about whether the user has been granted the specified role.

has_role ("role_name"[, 0])

Creates a procedure to check if the user is a System Administrator:

create procedure sa_check as 
if (has_role("sa_role", 0) > 0) 
begin 
    print "You are a System Administrator." 
    return(1) 
end

Checks that the user has been granted the System Security Officer role:

select has_role("sso_role", 0)

Checks that the user has been granted the Operator role:

select has_role("oper_role", 0)

has_role functions the same way proc_role does. Beginning with Adaptive Server version 15.0, Sybase supports—and recommends—that you use has_role instead of proc_role. You need not, hoever, convert all of your existing uses of proc_role to has_role.
has_role, a system function, checks whether an invoking user has been granted, and has activated, the specified role.
has_role returns 0 if the user has:
- Not been granted the specified role
- Not been granted a role which contains the specified role
- Been granted, but has not activated, the specified role
has_role returns 1 if the invoking user has been granted, and has activated, the specified role.
has_role returns 2 if the invoking user has a currently active role, which contains the specified role.
For general information about system functions, see “System functions”.

ANSI SQL – Compliance level: Transact-SQL extension.

Any user can execute has_role.