How can I create a query builder in Node.js?

How can I create a query builder in Node.js?

To create a query builder in Node.js, you can start by defining a class that constructs SQL queries using methods.

What methods should I include in my query builder?

You should include methods like select(), where(), orderBy(), and limit() to build your queries dynamically.

Can you show me a simple example of how to use it?

Sure! Here's a basic example:

class QueryBuilder {
    constructor() {
        this.query = '';
    }
    select(fields) {
        this.query += `SELECT ${fields} `;
        return this;
    }
    from(table) {
        this.query += `FROM ${table} `;
        return this;
    }
    where(condition) {
        this.query += `WHERE ${condition} `;
        return this;
    }
    build() {
        return this.query.trim() + ';';
    }
}

const qb = new QueryBuilder();
const sql = qb.select('*').from('users').where('age > 18').build();
console.log(sql); // Outputs: SELECT * FROM users WHERE age > 18;

How can I integrate this with a database?

You can use libraries like pg for PostgreSQL or mysql for MySQL to execute the generated SQL queries against your database.