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    CollectionFind::fields

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    CollectionFind::fields — Set document field filter

    Descrizione

    public mysql_xdevapi\CollectionFind::fields(string $projection): mysql_xdevapi\CollectionFind

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

    Elenco dei parametri

    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.

    Valori restituiti

    A CollectionFind object that can be used for further processing.

    Esempi

    Example #1 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());
    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

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