调用未定义的方法Closure :: query() [英] Call to undefined method Closure::query()

问题描述

我有以下终止语

$dbhProvider = function (){
    //Create connection.
    $instance = new \mysqli('localhost', USERNAME, PASSWORD, 'BLOG');
    return $instance;
};

我有以下实现方式

$mapper = new UserMapper($dbhProvider);

UserMapper 的 __ constructor 看起来像这样

public function __construct($connection){
    $this->connection = $connection;
    $sql = 'SELECT * FROM USERS WHERE ID=' . $this->user->getId();
    $result = $this->connection->query($sql);
}

当我执行时，出现以下错误调用未定义的方法Closure :: query().我该如何正确实现，以使 $ this-> connection 实例变量包含 mysqli 连接?

And when i exexute i have the following error Call to undefined method Closure::query(). How can i do the properly implement so that the $this->connection instance variable holds the mysqli connection?

推荐答案

public function __construct($provider) {
    // invoke the closure/provider/factory
    // so that it returns the mysqli instance
    // which then gets assigned to $this->connection
    $this->connection = $provider();
    $sql = 'SELECT * FROM USERS WHERE ID=' ....
}

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