How to create a query in Drupal 8

Question

I am used to using db_select in drupal 7 but now it\'s deprecated in drupal 8

So, If I need to create a query to list all users from users_field_data table,

Answer 1

db_select, db_insert, db_update, etc... were deprecated in Drupal 8.0.x and will be removed in Drupal 9.0.0.

Instead get a database connection injected into your service from the container and call select() on it. For example, $injected_database->select($table, $alias, $options);.

eg:

$db = \Drupal::database();

$data = $db->select('table_name','t')->fields('t')->execute();

$db->insert();

$db->update();