How to use the column function from knex

Find comprehensive JavaScript knex.column code examples handpicked from public code repositorys.

knex.column is a method in the Knex.js library that creates a new column reference for a query, allowing you to select or update specific columns in a database table.

index.js

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// const subquery = knex.select('name', 'age').from('users2').as('u');
// const data = await knex.select('u.name', 'u.age').from(subquery);

//const data = await knex.column('id', 'name', 'age').select().from('users2');
//const data = await knex.column(['id', 'name', 'age']).from('users2');
// const data = await knex
//   .column('id as identifier', { by: 'name' }, 'age')
//   .from('users2');

+ 5 other calls in file

How does knex.column work?

knex.column is a method in the Knex.js library that creates a new column reference for a query. When used in a query, knex.column can be used to specify which columns you want to select or update in a database table. In a SELECT query, you can use knex.column to specify which columns you want to retrieve from the table: javascript Copy code {{{{{{{ knex.select(knex.column('name'), knex.column('email')).from('users'); This query will select only the name and email columns from the users table. In an UPDATE query, you can use knex.column to specify which columns you want to update: javascript Copy code {{{{{{{ class="!whitespace-pre hljs language-javascript">knex('users').where({ id: 1 }).update(knex.column('email'), 'new-email@example.com'); This query will update the email column of the row with an id of 1 in the users table to 'new-email@example.com'. In essence, knex.column provides a way to create a column reference that can be used in a Knex.js query to specify which columns to select or update in a database table.

Ai Example

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const knex = require("knex")({
  client: "mysql",
  connection: {
    host: "127.0.0.1",
    user: "your_database_user",
    password: "your_database_password",
    database: "myapp_test",
  },
});

// Example 1: Using knex.column in a SELECT query
knex
  .select(knex.column("name"), knex.column("email"))
  .from("users")
  .then((rows) => {
    console.log(rows);
  });

// Example 2: Using knex.column in an UPDATE query
knex("users")
  .where({ id: 1 })
  .update(knex.column("email"), "new-email@example.com")
  .then(() => {
    console.log("Email updated!");
  });

In Example 1, we use knex.column to specify that we only want to select the name and email columns from the users table. In Example 2, we use knex.column to specify that we only want to update the email column of the row with an id of 1 in the users table. Note that knex.column can also be used in other types of queries, such as insert and delete.

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