How to create a dynamic data table using MySQL and JavaScript

How to create a dynamic data table using MySQL and JavaScript

Overview:
In modern web development, dynamic data tables are a very common component. By using the database management system MySQL and the front-end programming language JavaScript, we can easily create a dynamic data table for displaying and manipulating data in the database. This article will introduce in detail how to use MySQL and JavaScript to create a dynamic data table and provide specific code examples.

Steps:

1. Create database and table:
   First, we need to create a database in MySQL and create a table in it to store the data that needs to be displayed. Here is a simple example:

CREATE DATABASE my_database;
USE my_database;
CREATE TABLE my_table (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(50),
    age INT,
    email VARCHAR(100)
);

2. Connecting to the database:
   Next, we need to use JavaScript to connect to the MySQL database. Usually, we will use MySQL's official driver (such as node-mysql) to achieve this function. The following is a sample code to connect to the database:

const mysql = require('mysql');

const connection = mysql.createConnection({
    host     : 'localhost',
    user     : 'your_username',
    password : 'your_password',
    database : 'my_database'
});

connection.connect((err) => {
    if (err) throw err;
    console.log('Connected to MySQL database');
});

Please make sure to replace your_username and your_password in the above code with your actual MySQL username and password.

3. Query the database:
   After successfully connecting to the database, we can use JavaScript to query the data in the database and display it in the data table. The following is a simple sample code to query the database and display the data:

const sql = 'SELECT * FROM my_table';

connection.query(sql, (err, result) => {
    if (err) throw err;
    console.log('Fetched data from database:', result);

    // 将数据展示在表格中
    const table = document.getElementById('data-table');
    result.forEach((row) => {
        const newRow = table.insertRow();
        Object.values(row).forEach((value) => {
            const cell = newRow.insertCell();
            cell.innerHTML = value;
        });
    });
});

In the above example, we executed a simple SELECT statement to obtain all the data in the database and display it in In an HTML table with the ID data-table.

4. Other operations:
   In addition to querying data, we can also use JavaScript to perform other database operations, such as inserting, updating, or deleting data. The following is a sample code for inserting data:

const sql = `INSERT INTO my_table (name, age, email) VALUES ('John', 25, 'john@example.com')`;

connection.query(sql, (err, result) => {
    if (err) throw err;
    console.log('Inserted a new row into the database');
});

The above code will insert a new row of data in the my_table table of the database.

Summary:
By using MySQL and JavaScript, we can easily create a dynamic data table and display and operate the data in the database. This article provides specific code examples for connecting to the database, querying data, and performing other operations. I hope it will be helpful to everyone when developing dynamic data tables.

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