mysql select oop php

Question

这是我的oop php代码，用于连接我的数据库。但我怎么做SELECT函数。我想从数据库中显示我的网页中的数据。帮我这个

class createConnection //create a class for make connection 
{ 
    var $host = "localhost"; 
    var $username = "root"; // specify the sever details for mysql 
    var $password = ""; 
    var $database = "akpGroup"; 
    var $myconn; 

    function connectToDatabase() // create a function for connect database 
    { 
     $conn = mysql_connect($this->host, $this->username, $this->password); 
     if (!$conn) // testing the connection 
     { 
      die ("Cannot connect to the database"); 
     } else { 
      $this->myconn = $conn; 
      echo "Connection established"; 
     } 

     return $this->myconn; 
    } 

    function selectDatabase() // selecting the database. 
    { 
     mysql_select_db($this->database); //use php inbuild functions for select database 
     if (mysql_error()) // if error occured display the error message 
     { 
      echo "Cannot find the database " . $this->database; 
     } 
     echo "Database selected.."; 
    } 

    function closeConnection() // close the connection 
    { 
     mysql_close($this->myconn); 
     echo "Connection closed"; 
    } 

Answer 1

可能考虑使用mylsqi_或PDO的功能是这样的

$link = mysql_connect('localhost','root','yourPassword') 
mysql_select_db('database_name', $link); 
$sql = 'SELECT column FROM tablename'; 
$result = mysql_query($sql, $link) or die(mysql_error()); 
$row = mysql_fetch_assoc($result); 
print_r($row); 

Answer 2

首先的。

基本上，您的查询功能应该看起来像下面的一样。它会查询并将所有结果放入一个数组中。

您可以返回数组或将其分配给类变量，就像您在其他方法中那样。

function query($sql) { 
     $result_array = array(); 
     $query = mysql_query($sql); 
     if(mysql_affected_rows() > 0) { 
       while($fetch = mysql_fetch_assoc($query)) { 
        $result_array[] = $fetch; 
       } 
     } 
     else { 
       //no results action if needed 
     } 

     return $result_array; 
    }