ReactJs tutorial: PostGreSQL to ReactJs Connectivity via NodeJs with GithubLink
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- เผยแพร่เมื่อ 9 ก.พ. 2025
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PostGreSQL to ReactJs Connectivity via NodeJs .
In this video , I have discussed about , connect Postgres-nodeJs to ReactJs
github.com/cha...
Step by step instructions given :
Brief explanation of what the presentation covers:
Creating a PostgreSQL database and table
Building APIs in Node.js
Testing APIs with Postman/ browser
Creating a React app to consume APIs
Displaying data in a Material-UI table
coding , development and presentation
github link : github.com/cha...
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CREATE DATABASE my_database;
CREATE TABLE users (
id SERIAL PRIMARY KEY,
name VARCHAR(100),
email VARCHAR(100)
);
INSERT INTO users_table (name, email) VALUES ('John Doe', 'john@example.com');
INSERT INTO users_table (name, email) VALUES ('Rushi Gattupalli', 'rs001@example.com');
INSERT INTO users_table (name, email) VALUES ('Sravalya', 'srav@example.com');
select * from users_table
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possible errors:
Here are the possible errors in your code, without resolutions:
1. PostgreSQL Connection Errors
Incorrect credentials (user, password, database, host, or port).
PostgreSQL server is not running or cannot be reached.
Firewall or network restrictions blocking the connection.
2. Missing or Incorrect Table
The table users_table does not exist in the books_nest database.
Typo in the table name or query (SELECT * FROM users_table).
3. Unhandled Errors in pool.query
If the query fails (e.g., invalid SQL, missing table), the app will crash due to missing error handling.
4. CORS Misconfiguration
Frontend requests might fail if the cors() middleware is not configured to allow the correct origin.
5. Port Conflict
Port 3009 is already in use by another application.
6. Missing await in Asynchronous Code
Forgetting await in pool.query will result in a Promise being returned instead of the query result.
7. Empty Table
If users_table is empty, the API will respond with an empty array ([]), which might not be expected.
8. Node.js Version Incompatibility
Using an outdated Node.js version may cause issues with modern JavaScript features like async/await.
9. Pool Exhaustion
Too many concurrent database requests could exhaust the connection pool, causing queries to fail or hang.
10. Lack of Logging or Debugging
Over-reliance on console.log for debugging can make it difficult to identify and resolve issues in production environments.
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for queries :
whatsapp me @ +91 - 9164500418
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