Add collection to schema

# Schema::createCollection

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Schema::createCollection — Add collection to schema

### 说明

public function mysql_xdevapi\Schema::createCollection(string `$name`, string `$validate` = ?): mysql_xdevapi\Collection

Create a collection within the schema.

### 参数

`name`

  Collection name.

`validate`

  Validation definition, as a JSON object.

### 返回值

The Collection object.

### 更新日志

版本 | 说明
--- | ---
8.0.20 | Added the optional validate parameter.

### 示例

示例 #1 mysql_xdevapi\Schema::createCollection() example

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

    $session->sql("DROP DATABASE IF EXISTS food")->execute();
    $session->sql("CREATE DATABASE food")->execute();
    $session->sql("CREATE TABLE food.fruit(name text, rating text)")->execute();

    $schema = $session->getSchema("food");
    $schema->createCollection("trees");

    print_r($schema->gettables());
    print_r($schema->getcollections());

以上示例的输出类似于：

    Array
    (
        [fruit] => mysql_xdevapi\Table Object
            (
                [name] => fruit
            )
    )
    Array
    (
        [trees] => mysql_xdevapi\Collection Object
            (
                [name] => trees
            )
    )

示例 #2 mysql_xdevapi\Schema::createCollection() example

    <?php
     $collection = $schema->createCollection("mycollection", '{
        "validation": {
            "level": "strict",
            "schema": {
                "id": "http://json-schema.org/geo",
                "description": "A geographical coordinate",
                "type": "object",
                "properties": {
                    "latitude": {
                        "type": "number"
                    },
                    "longitude": {
                        "type": "number"
                    }
                },
                "required": ["latitude", "longitude"]
            }
        }
    }');
    // Succeeds
    $collection->add('{"latitude": 10, "longitude": 20}')->execute();

    // Fails, invalid types (not numbers)
    $collection->add('{"latitude": "lat", "longitude": "long"}')->execute();

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