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On . By CodimTh

In this tutorial, we will see how to add field to custom schema in Drupal 8 without losing data using a hook_update_N().

Example how to use hook_update_N() :


use Drupal\Core\Database\Database;

 * @param $sandbox
function mymodule_update_90002(&$sandbox) {
  $spec = [
    'type' => 'varchar',
    'description' => "New Col",
    'length' => 20,
    'not null' => FALSE,
  $schema = Database::getConnection()->schema();
  $schema->addField('mymodule', 'newcol', $spec);
  $schema->addIndex('mymodule', 'newcol',['newcol'],$spec);

  return t('new col added to mymodule table.');

After this, running drush updb or running update.php from the admin interface should detect your hook_update_N() and it should add your new field.




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