Rest Api | Api | Oracle Tutorial

Introduction to REST API with Oracle

REST API allows you to access and manipulate Oracle data over HTTP. This tutorial covers the basics of setting up and using REST APIs with Oracle databases.

Prerequisites

Before proceeding, ensure you have an Oracle database instance set up and accessible. You should also have basic knowledge of RESTful principles and HTTP methods.

Setting Up REST API in Oracle

Oracle REST Data Services (ORDS) is used to develop and deploy RESTful services for Oracle Database. Install and configure ORDS on your server.

Example command to install ORDS:

java -jar ords.war install simple

Creating RESTful Endpoints

Define RESTful endpoints to expose Oracle data. This involves mapping SQL queries to HTTP methods like GET, POST, PUT, and DELETE.

Example SQL query to create an endpoint:

BEGIN
  ORDS.ENABLE_OBJECT(p_enabled => TRUE);
  ORDS.DEFINE_MODULE(
    p_module_name    => 'my_module',
    p_base_path      => '/api',
    p_items_per_page => 0,
    p_status         => 'PUBLISHED'
  );
  ORDS.DEFINE_TEMPLATE(
    p_module_name    => 'my_module',
    p_pattern        => 'employees/',
    p_method         => 'GET',
    p_source_type    => 'json/collection',
    p_items_per_page => 0,
    p_status         => 'PUBLISHED',
    p_comments       => 'Get all employees'
  );
  ORDS.DEFINE_HANDLER(
    p_module_name    => 'my_module',
    p_pattern        => 'employees/',
    p_method         => 'GET',
    p_source_type    => 'plsql/block',
    p_items_per_page => 0,
    p_status         => 'PUBLISHED',
    p_comments       => 'Get all employees',
    p_source         => 
'BEGIN
  OPEN :employees FOR
    SELECT * FROM employees;
END;'
  );
  COMMIT;
END;

Consuming REST API

Use tools like cURL, Postman, or programming languages (e.g., JavaScript) to consume the REST API endpoints and interact with Oracle data.

Example cURL command to fetch employees:

curl -X GET http://example.com/api/employees/

Security Considerations

Implement authentication and authorization mechanisms to secure your Oracle data accessed via REST API. Use HTTPS for secure communication.

Conclusion

Using REST API with Oracle provides a flexible and efficient way to access and manipulate data over HTTP, integrating Oracle databases with modern web and mobile applications.

Accessing Oracle Data via REST API