mysql_fetch_array()期望参数1是资源,给定字符串

Question

我有两个类DBConn和DBQueries.DBQueries继承之后DBConn.当我要在用户数据库中显示所有用户时,我看到消息:

mysql_fetch_array()期望参数1是资源,给定字符串.

谢谢你的任何建议.

class DBConn /*extends Config*/ {
  public function dbConnection(){
    $db_host = 'localhost';
    $db_login = 'root';
    $db_password = '';
    $db_name = "database";
    $conn = mysql_connect($db_host, $db_login, $db_password);
    $db = mysql_select_db($db_name);
  }  
}

class DBQueries extends DBConn {
  function displayUsers(){
    $this->dbConnection();
    $query = "SELECT * FROM users";
    $result = mysql_query($query);
    while ($row = mysql_fetch_array($query)) {
      echo $row['password'];
    }
  }
}

Answer 1

当你需要传入哪个是你的db结果对象时,你传入的$query是你的sql字符串$result.

class DBQueries extends DBConn {
    function displayUsers(){
        $this->dbConnection();
        $query = "SELECT * FROM users";
        $result = mysql_query($query);
        while ($row = mysql_fetch_array($result)) {
            echo $row['password'];
        }
    }
}