Uncaught Error: Call to a member function fetchAll() on boolean

Question

index.php:

$db = new Db();
$param = [':name' => 'Alex'];
$data = $db->sql('select * from test where name = :name',$param)->query();
var_dump($data);

并得到错误：

 Fatal error: Uncaught Error: Call to a member function fetchAll() on boolean

Db.php

   public function sql($sql,array $params = null)
    {   
        $sql = $this->connection->prepare($sql);

        if($params){
            foreach ($params as $key => $param) {
                $sql->bindParam($key, $param);
            }
        }

        $this->statement = $sql;
        return $this; 
    }


    public function query($type = 1)
    {
      $statement = $this->statement->execute();

      return ($type == 1) ? $statement->fetchAll(static::$DB_FETCH) : $statement->fetch(static::$DB_FETCH);
    }

如果我运行在sql()方法中，execute()和fetch()里面的数据，是可以真正拿到数据的，但是把execute()和fetch () 到 query() 方法，得到错误信息，有什么想法吗？ ;

Answer 1

试试这个

 public function query($sql,array $params = null,$type = 1)
    {
      $sql = $this->connection->prepare($sql);

      if($params){
          foreach ($params as $key => $param) {
              $sql->bindParam($key, $param);
          }
      }

      $this->statement = $sql;

      $statement = $this->statement->execute();

      return ($type == 1) ? $statement->fetchAll(static::$DB_FETCH) : $statement->fetch(static::$DB_FETCH);
    }

和

$data = $db->query('select * from test where name = :name',$param);

Answer 2

您的代码有错误。在这一行中：

$statement = $this->statement->execute();

execute()方法是PDOStatement::execute。这是签名：

public bool PDOStatement::execute ([ array $input_parameters ] )

这意味着它 returns 布尔值。你的错误是你试图在布尔值上调用 fetchAll()。

有关错误消息的详细信息，请参阅 this page。

Answer 3

$statement = $this->statement->execute();

您的代码正在返回一个布尔值。但是您的语句对象包含您处理过的数据。顺便说一下，您必须通过以下方式从主语句获取返回值：

 $this->statement->fetchAll();

此致。

Uncaught Error: Call to a member function fetchAll() on boolean

Uncaught Error: Call to a member function fetchAll() on boolean

php

pdo

execute