CollectionAdd constructor

# CollectionAdd::__construct

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CollectionAdd::__construct — CollectionAdd constructor

### 说明

private function mysql_xdevapi\CollectionAdd::__construct()

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

### 参数

此函数没有参数。

### 示例

示例 #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);

    ?>

以上示例的输出类似于：

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

### 注释

> 注意:

> 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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