CollectionAdd constructor

# CollectionAdd::__construct

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CollectionAdd::__construct — CollectionAdd constructor

### Description

private mysql_xdevapi\CollectionAdd::__construct()

Use to add a document to a collection; called from a Collection object.

### Parameters

This function has no parameters.

### Examples

Example #1 mysql_xdevapi\CollectionAdd::__construct() 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");
$collection = $schema->getCollection("people");
// Add two documents
$collection
->add('{"name": "Fred", "age": 21, "job": "Construction"}')
->execute();
$collection
->add('{"name": "Wilma", "age": 23, "job": "Teacher"}')
->execute();
// Add two documents using a single JSON object
$result = $collection
->add(
'{"name": "Bernie",
"jobs": [{"title":"Cat Herder","Salary":42000}, {"title":"Father","Salary":0}],
"hobbies": ["Sports","Making cupcakes"]}',
'{"name": "Jane",
"jobs": [{"title":"Scientist","Salary":18000}, {"title":"Mother","Salary":0}],
"hobbies": ["Walking","Making pies"]}')
->execute();
// Fetch a list of generated ID's from the last add()
$ids = $result->getGeneratedIds();
print_r($ids);
?>`

The above example will output something similar to:

    Array
    (
        [0] => 00005b6b53610000000000000056
        [1] => 00005b6b53610000000000000057
    )

### Notes

> Note:

> A unique _id is generated by MySQL Server 8.0 or higher, as demonstrated in the example. The _id field must be manually defined if using MySQL Server 5.7.

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