php – 使用OOP从MySQL获取数据

该方法不是最好的,但为了实现您想要做的事情：

public function Fetch($set_table_name){
    $query=mysql_query("SELECT * FROM ".$set_table_name); 
    $result = array();
    while ($record = mysql_fetch_array($query)) {
         $result[] = $record;
    }
    return $result;
}

这将使每行成为$result的一部分,但您必须像这样访问它：

您可以像这样调用fetch函数：

$result = $connect->Fetch('posts');

echo $result[0]['columnName'];  // for row 0;

或者循环：

for ($x = 0; $x < count($result); $x++) {
   echo $result[$x][0] . "<BR>";  // outputs the first column from every row
}

也就是说,将整个结果集提取到内存中并不是一个好主意(有人会说这是一个非常糟糕的主意.)

编辑：看起来你的班级还有其他问题…我必须跑,但明天会回来查看,如果其他人没有按你说话,我会扩展.

编辑2：好的,要在你的课上做一次性尝试并尝试解释一些事情：

class MySQL {

  //declaring the private variables that you will access through $this->variable;
  private $host;  
  private $username;
  private $password;
  private $database;
  private $conn;  // Adding the connection,more on this later.

  public function __Construct($set_host,$set_password){
    $this->host = $set_host;
    $this->username = $set_username;
    $this->password = $set_password;
    // Combining the connection & connection check using 'or'
    // Notice that I removed the semi-colon after the mysql_connect function
    $this->conn = mysql_connect($this->host,$this->password)
                  or die("Couldn't connect");
  }

  public function Database($set_database)
  {   
    $this->database=$set_database;
    // Adding the connection to the function allows you to have multiple 
    // different connections at the same time.  Without it,it would use
    // the most recent connection.
    mysql_select_db($this->database,$this->conn) or die("cannot select Dataabase");
  }

  public function Fetch($table_name){
    // Adding the connection to the function and return the result object instead
    return mysql_query("SELECT * FROM ".$table_name,$this->conn);         
  }

}

$connect = new MySQL('localhost','');
$connect->Database('cms');
$posts = $connect->Fetch('posts');

if ($posts && mysql_num_rows($posts) > 0) {
     echo "Here is some post data:<BR>";
     while ($record = mysql_fetch_array($posts)) {
         echo $record[0];  // or a quoted string column name instead of numerical index.
     }
} else {
     echo "No posts!";
}

我希望这有帮助……至少应该让你开始.如果您有更多问题,请分别询问.