Saturday, December 1, 2012

Minimal Membership Provider for Oracle

Requirements

A minimal membership provider requires a dedicated table to keep track of user names and passwords.

'Users' table diagram.

This is a sample “Users” table with “identity” primary key. It is necessary to create a sequence and trigger to update the identity key every time a new user is created.

SQL:

create sequence users_seq;

create table 
users
(
    user_id 
int not null primary key,
    user_name varchar2(128) not null,
    password varchar2(128) not null
);

create or replace trigger 
users_trigger
    before 
insert
    on 
users
   
for each 
row
declare

    u_id users.user_id%type;
begin
    select users_id_seq.nextval into u_id from dual;
    :new.user_id := u_id;
end users_trigger;
/

Here is how the table may look if a “unique identifier” primary key is implemented. Oracle will automatically assign a unique identifier when a new user is created.

SQL:

create table users
(
    user_id 
raw(16) default sys_guid() not null primary key,
    user_name varchar2(128) not null,
    password varchar2(128) not null
);

User roles are hardcoded in the minimal Role Provider implementation.

Configuration

Create a table in your database using one of the scripts specified above.

Select the project name on the start page of the application generator and choose Settings.

Proceed to Authentication and Membership.

Select “Enable custom membership and role providers” option and enter the following configuration settings.

table Users=Users
column [int|uiid] UserID = user_id
column [text] UserName = user_name
column [text] Password = password

role Administrators = admin
role Users = admin, user
role Everybody = *

The configuration maps logical table Users required for membership provider implementation to the physical database table Users. It also defines three user roles – Administrators, Users, and Everybody.

Generate the project to see the membership provider in action.

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