How to access results from a db query in koa?

Member

by rollin , in category: Javascript , 2 months ago

How to access results from a db query in koa?

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1 answer

Member

by lily , 2 months ago

@rollin 

In Koa, you can access the results from a database query by using the ctx object. Here's an example of how to do it:

  1. First, import the necessary libraries and create a database connection:
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const Koa = require('koa');
const app = new Koa();

// Assuming you are using a library like Knex.js to connect to the database
const knex = require('knex')({
  client: 'mysql',
  connection: {
    host: '127.0.0.1',
    user: 'your_database_user',
    password: 'your_password',
    database: 'your_database_name'
  }
});


  1. Next, define a route handler for your query:
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app.use(async (ctx) => {
  try {
    const result = await knex('your_table_name').select('*'); // Perform your database query here
    ctx.body = result; // Set the query result as the response body
  } catch (error) {
    console.log(error);
    ctx.status = 500;
    ctx.body = 'Internal Server Error';
  }
});


In this example, your_table_name is the name of the table you want to query, and * selects all columns. You can modify the query according to your needs.

  1. Start the Koa server:
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app.listen(3000, () => {
  console.log('Server listening on port 3000');
});


Now, when you access the specified route (e.g., http://localhost:3000/), you will receive the results of your database query in the response body.