CascadiaPHP 2024

CollectionFind::fields

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CollectionFind::fieldsSet document field filter

Description

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.

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.

Return Values

A CollectionFind object that can be used for further processing.

Examples

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());
?>

The above example will output something similar to:

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