Tag: crud

Crud operation in React.js & RDS with Nodejs

To perform CRUD (create, read, update, delete) operations on an RDS database from a React.js application, you will need to use a server-side language to interact with the database. Here is an example of how you might implement CRUD operations using Node.js and the MySQL library:

1. Install the MySQL library: npm install mysql
2. Set up a connection to the RDS database in a Node.js server:

const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'your-rds-endpoint',
  user: 'your-username',
  password: 'your-password',
  database: 'your-database'
});

connection.connect();

3. Create a function to perform a CREATE operation:

function create(item) {
  return new Promise((resolve, reject) => {
    connection.query('INSERT INTO items SET ?', item, (error, results) => {
      if (error) {
        reject(error);
      } else {
        resolve(results.insertId);
      }
    });
  });
}

4. Create a function to perform a READ operation:

function read(id) {
  return new Promise((resolve, reject) => {
    connection.query('SELECT * FROM items WHERE id = ?', [id], (error, results) => {
      if (error) {
        reject(error);
      } else {
        resolve(results[0]);
      }
    });
  });
}

5. Create a function to perform an UPDATE operation:

function update(id, item) {
  return new Promise((resolve, reject) => {
    connection.query('UPDATE items SET ? WHERE id = ?', [item, id], (error, results) => {
      if (error) {
        reject(error);
      } else {
        resolve();
      }
    });
  });
}

6. Create a function to perform a DELETE operation:

function delete(id) {
  return new Promise((resolve, reject) => {
    connection.query('DELETE FROM items WHERE id = ?', [id], (error, results) => {
      if (error) {
        reject(error);
      } else {
        resolve();
      }
    });
  });
}

7. In your React.js application, use Axios or another HTTP library to make requests to the Node.js server and perform the CRUD operations:

import axios from 'axios';

// create an item
axios.post('/api/items', { name: 'item1' }).then(response => {
  console.log(response.data.id);
});

// read an item
axios.get('/api/items/1').then(response => {
  console.log(response.data);
});

// update an item
axios.put('/api/items/1', { name: 'item2' }).then(response => {
  console.log(response.data);
});

// delete an item
axios.delete('/api/items

Crud operation in React.js & RDS with SpringBoot

To perform CRUD (create, read, update, delete) operations on an RDS database from a React.js application using Spring Boot, you will need to create a Spring Boot API that communicates with the database. Here is an example of how you might implement CRUD operations using Spring Boot and the MySQL library:

1. Add the MySQL dependency to your build.gradle file:

dependencies {
  compile('org.springframework.boot:spring-boot-starter-data-jpa')
  compile('mysql:mysql-connector-java')
}

2. Set up a connection to the RDS database in your Spring Boot application:

spring.datasource.url=jdbc:mysql://your-rds-endpoint/your-database
spring.datasource.username=your-username
spring.datasource.password=your-password

3. Create a model class for your items:

@Entity
@Table(name = "items")
public class Item {

  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private long id;

  @Column(name = "name")
  private String name;

  // getters and setters
}

4. Create a repository interface to perform CRUD operations:

public interface ItemRepository extends CrudRepository {
}

5. Create a controller to handle HTTP requests and delegate to the repository:

@RestController
@RequestMapping("/api/items")
public class ItemController {

  private final ItemRepository repository;

  public ItemController(ItemRepository repository) {
    this.repository = repository;
  }

  @PostMapping
  public Item create(@RequestBody Item item) {
    return repository.save(item);
  }

  @GetMapping("/{id}")
  public Item read(@PathVariable long id) {
    return repository.findById(id).orElse(null);
  }

  @PutMapping("/{id}")
  public Item update(@PathVariable long id, @RequestBody Item item) {
    item.setId(id);
    return repository.save(item);
  }

  @DeleteMapping("/{id}")
  public void delete(@PathVariable long id) {
    repository.deleteById(id);
  }
}

6. In your React.js application, use Axios or another HTTP library to make requests to the Spring Boot API and perform the CRUD operations:

import axios from 'axios';

// create an item
axios.post('/api/items', { name: 'item1' }).then(response => {
  console.log(response.data.id);
});

// read an item
axios.get('/api/items/1').then(response => {
  console.log(response.data);
});

// update an item
axios.put('/api/items/1', { name: 'item2' }).then(response => {
  console.log(response.data);
});

// delete an item
axios.delete('/api

Crud operation in React.js & RDS with Python

To perform CRUD (create, read, update, delete) operations on an RDS database from a React.js application using Python, you will need to create a Python server that communicates with the database. Here is an example of how you might implement CRUD operations using the Flask and PyMySQL libraries:

1. Install the Flask and PyMySQL libraries: pip install flask pymysql
2. Set up a connection to the RDS database in your Python server:

import pymysql

connection = pymysql.connect(
    host='your-rds-endpoint',
    user='your-username',
    password='your-password',
    db='your-database',
    cursorclass=pymysql.cursors.DictCursor
)

3. Create a Flask route to handle a CREATE operation:

@app.route('/api/items', methods=['POST'])
def create():
    with connection.cursor() as cursor:
        cursor.execute('INSERT INTO items (name) VALUES (%s)', (request.form['name'],))
        item_id = cursor.lastrowid
    connection.commit()
    return str(item_id)

4. Create a Flask route to handle a READ operation:

@app.route('/api/items/', methods=['GET'])
def read(id):
    with connection.cursor() as cursor:
        cursor.execute('SELECT * FROM items WHERE id = %s', (id,))
        item = cursor.fetchone()
    return jsonify(item)

5. Create a Flask route to handle an UPDATE operation:

@app.route('/api/items/', methods=['PUT'])
def update(id):
    with connection.cursor() as cursor:
        cursor.execute('UPDATE items SET name = %s WHERE id = %s', (request.form['name'], id))
    connection.commit()
    return ''

6. Create a Flask route to handle a DELETE operation:

@app.route('/api/items/', methods=['DELETE'])
def delete(id):
    with connection.cursor() as cursor:
        cursor.execute('DELETE FROM items WHERE id = %s', (id,))
    connection.commit()
    return ''