CollectionFind::fields

Set document field filter

&reftitle.description; public `mysql_xdevapi\CollectionFind` `mysql_xdevapi\CollectionFind::fields` `string` `projection`

Defines the columns for the query to return. If not defined, all columns are used.

&reftitle.parameters;

`projection`

- Can either be a single string or an array of strings identifying the columns to be returned for each document that match the search condition.

&reftitle.returnvalues;

A CollectionFind object that can be used for further processing.

&reftitle.examples;

### `mysql_xdevapi\CollectionFind::fields` example

    <?php
    $session = mysql_xdevapi\getSession("mysqlx://user:password@localhost");

    $session->sql("DROP DATABASE IF EXISTS addressbook")->execute();
    $session->sql("CREATE DATABASE addressbook")->execute();

    $schema = $session->getSchema("addressbook");
    $create = $schema->createCollection("people");

    $create
      ->add('{"name": "Alfred", "age": 18, "job": "Butler"}')
      ->execute();

    // ...

    $collection = $schema->getCollection("people");

    $result = $collection
      ->find('job like :job and age > :age')
      ->bind(['job' => 'Butler', 'age' => 16])
      ->fields('name')
      ->execute();

    var_dump($result->fetchAll());
    ?>

&example.outputs.similar;

    array(1) {
      [0]=>
      array(1) {
        ["name"]=>
        string(6) "Alfred"
      }
    }