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Module 5 Web Programing Setting Up Postgres.pptx
- 2. • Setting Up Postgres and a Repository Layer with TypeORM • Technical requirements • Setting up our Postgres database • Understanding object relational mappers by using TypeORM • Building our repository layer using Postgres and TypeORM
- 3. What is data • Data can come in the form of text, observations, figures, images, numbers, graphs, or symbols. • For example, data might include individual prices, weights, addresses, ages, names, temperatures, dates, or distances. • Data is a raw form of knowledge and, on its own, doesn't carry any significance or purpose.
- 4. What Is a Database? • A database is an organized collection of structured information, or data, typically stored electronically in a computer system. • Some real-life examples of databases include student database, employee database, eCommerce, healthcare, online banking systems, hotel booking systems, airline reservation systems.
- 7. Types of Databases • Hierarchical Databases. • Relational Databases. • Network Databases. • Object oriented databases
- 8. Types of Databases • Hierarchical Databases. data model in which the data are organized into a tree-like structure
- 9. A relational database is a type of database that stores and provides access to data points
- 10. • Network Databases. a database model where numerous records or files can link to multiple owner files
- 11. object-oriented database (OOD) • An object-oriented database (OOD) is a database system that can work with complex data objects — that is, objects that mirror those used in object-oriented programming languages. In object-oriented programming (OOP), everything is an object.
- 13. What Is a Database Management System? • Database Management Systems (DBMS) are software systems used to store, retrieve, and run queries on data. • A DBMS serves as an interface between an end-user and a database, allowing users to create, read, update, and delete data in the database. • Eg. MySql, Oracle, PostgreSQL, Access, MongoDB
- 14. SQL • What is SQL? • SQL stands for Structured Query Language • SQL lets you access and manipulate databases
- 15. What Can SQL do? • SQL can execute queries against a database • SQL can retrieve data from a database • SQL can insert records in a database • SQL can update records in a database • SQL can delete records from a database • SQL can create new databases • SQL can create new tables in a database
- 16. What is PostgreSQL and why it is used? • It is a highly stable database management system, backed by more than 20 years of community development which has contributed to its high levels of resilience, integrity, and correctness.
- 17. The minimum hardware required to install and run PostgreSQL is: • 1 GHz processor. • 2 GB of RAM. • 512 MB of HDD.
- 18. Who uses PostgreSQL? Top Companies using PostgreSQL Company Name Website Revenue Netflix www.netflix.co m $24.9 Billion Uber auth.uber.com $14.6 Billion Instacart www.instacart.c om $1.8 Billion LaunchDarkly launchdarkly.co m $57 Million
- 19. Benefits of PostgreSQL • In other words, it offers atomicity, consistency, isolation and durability features. PostgreSQL's advanced features include stored procedures, triggers, user-defined functions, transactions and replication. • PostgreSQL provides enterprise-grade scalability performance, availability and functionality. Thus, you can deploy PostgreSQL in a distributed architecture, which can handle large volumes of data. • Another important feature of PostgreSQL is that it’s open source, which makes it an affordable solution for businesses to keep costs low. • PostgreSQL has an excellent track record of reliability and data security. • It’s been used in production by customers for decades and is trusted by many organizations and businesses worldwide.
- 20. How to setup the PostgreSQL? 1.Download the installer from the official PostgreSQL website: https://www.postgresql.org/download/windows/ 2.Run the installer and follow the instructions. 3.Start the PostgreSQL Service: 4.Windows: PostgreSQL service should start automatically after installation. 5.Access PostgreSQL Shell: 6.Windows: Open the SQL Shell (psql) from the PostgreSQL folder in the Start menu. 7.Change Password for the PostgreSQL User:
- 21. 8. Windows: Open the SQL Shell (psql). 9. CREATE DATABASE your_database; 10. Switch to the New Database: 11. Create a User for the Database: 12. CREATE USER your_user WITH PASSWORD 'your_password'; 13. GRANT ALL PRIVILEGES ON DATABASE your_database TO your_user; 14. Exit the PostgreSQL ShellConnect to PostgreSQL: 15. You can now connect to PostgreSQL using a database client or your preferred programming language.For example, using the psql command- line client:
- 22. Class • A class is a template for creating objects in program. • Example: Car. Object • The object is an instance of a class. • Example: Jaguar, BMW, Tesla, etc.
- 24. Object Relational Mapper (ORM) • ORM stands for Object-Relational Mapping. It is a programming technique that allows you to interact with a relational database using an object-oriented programming language. • The main purpose of an ORM is to bridge the gap between the relational model of a database and the object-oriented model of a programming language. With an ORM, you can interact with the database using objects and their methods, rather than writing raw SQL queries.
- 25. TypeScript is an open-source programming language developed by Microsoft. TypeScript offers numerous benefits for developers • Improved Developer Experience: • Enhanced Code Quality: • Large and complex web applications: • API development: • Reduced runtime errors: • Improved performance:
- 26. • TypeORM is an Object-Relational Mapping (ORM) library for TypeScript • It enables developers to interact with relational databases using TypeScript • TypeORM supports a variety of database management systems, including PostgreSQL, MySQL, MariaDB, SQLite, and Microsoft SQL Server.
- 27. Building our repository layer using Postgres and TypeORM • Building a repository layer using PostgreSQL and TypeORM involves setting up a database, defining entities, creating a repository, and integrating TypeORM into your project. • Below is a step-by-step guide using Node.js and TypeScript, assuming you have Node.js and npm installed.
- 28. Step 1: Project Setup • Create a new project and initialize it with npm: Step 2: TypeScript Configuration • Create a tsconfig.json file in the root directory: Step 3: PostgreSQL Configuration • Create a PostgreSQL database and note down the connection details (host, username, password, database name). Step 4: TypeORM Configuration • Create an ormconfig.json file in the root directory:
- 29. • Replace "your_username", "your_password", and "your_database" with your PostgreSQL credentials. Step 5: Create Entities • Create a src/entities/User.ts file: Step 6: Create Repository • Create a src/repositories/UserRepository.ts file: Step 7: Create an Express App • Create a src/index.ts file: Step 8: Run the Application • Compile TypeScript and start the application: