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Oracle
Tuesday, December 4, 2012PrintSubscribe
Basic Membership Provider for Oracle Server

Requirements

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

A role provider will require two tables to keep track of roles and associations of users with roles.

"Users", "Roles", and "User_Roles" table schema for basic membership provider.

These are the basic membership and role provider tables with “identity” primary keys.

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,
    email varchar2(128)
)
;

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;
/

create 
sequence roles_seq;

create table roles
(
    role_id 
int not null primary key,
    role_name varchar2(50)
)
;

create or replace trigger roles_trigger
    before 
insert
  on roles
   
for each row
declare

    r_id roles.role_id%type;
begin
  select roles_seq.nextval into r_id from dual;
  :new.role_id := r_id;
end roles_trigger;
/

create table 
user_roles
(
    user_id 
int not null,
    role_id int not null,
  constraint pk_user_roles primary key(user_id, role_id),
  constraint fk_users foreign key(user_id) references users(user_id),
  constraint fk_roles foreign key(role_id) references roles(role_id)
)
;

These are the basic membership and role provider tables with “unique identifier” primary keys.

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,
    email varchar2(128)
);

create table 
roles
(
    role_id 
raw(16) default sys_guid() not null primary key,
    role_name varchar2(50
)
)
;

create table 
user_roles
(
    user_id 
raw(16) not null,
    role_id raw(16) not null,
    constraint pk_user_roles primary key(user_id, role_id),
    constraint fk_users foreign key(user_id) references users(user_id),
    constraint fk_roles foreign key(role_id) references 
roles(role_id)
)
;

Configuration

Use one of the scripts above to create the tables in your database.

Start Code On Time web application generator, select the project name on the start page, and choose Settings. Select 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
column [text] Email = email

table Roles = roles
column [int|uiid] RoleID = role_id
column [text] RoleName = role_name

table UserRoles = user_roles
column [int|uiid] UserID = user_id
column [int|uiid] RoleID = role_id

The configuration will guide the code generator in mapping the logical tables Users, Roles, and UserRoles to the physical tables in the database.

Generate the project to create the custom membership and role provider.

Saturday, December 1, 2012PrintSubscribe
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.

Monday, November 26, 2012PrintSubscribe
SQL Business Rules for Oracle Databases

SQL business rules are implemented in the programing language supported by application database engine.

If an Oracle database is the foundation of your data tier, then the programming language of SQL business rules is PL/SQL.

Consider Employees page displaying createForm1 in a project created straight from HR sample database.

Page 'Employees' displaying 'createForm1' view in a project created from the sample HR database available with Oracle database engines

None of the fields has a default value. Let’s assign default values to First Name, Last Name, Hire Date, and Salary.

Start Project Designer, activate Controllers tab, locate EMPLOYEES data controller and start creating a new SQL business rule.

Creating a new SQL business rule in Code On Time application generator

Configure the rule as follows:

Property Value
Command Name New
Type SQL
Phase Execute
Script

begin
    :FIRST_NAME := 'John';
    :LAST_NAME := 'Doe';
    :HIRE_DATE := sysdate;
    select avg(SALARY) into :SALARY from EMPLOYEES;
end;

Save the rule.

The script is written in PL/SQL. The highlighted field names are referenced as parameters in the script text.

image

When executed, the script will assign static values to First Name and Last Name fields.

The current system date will be assigned to Hire Date field.

An average of all employee salaries will be assigned to Salary field.

SQL business rule writtent in PL/SQL assigns default values to the field when a user starts creating a new record

The full power of PL/SQL is available to application developers when creating applications with Code On Time.