PHP的PDO - 选择从哪里（从输入字段获得值）

Question

我想运行查询从PHP获取数据从MySQL的Pdo。

查询必须是这样的：SELECT * FROM akt_djubrenje where ID_akt = (I need to get value from html with ajax)...

所以首先我有一个MySQL数据：

CREATE TABLE IF NOT EXISTS `akt_djubrenje` (
    `ID` int(11) NOT NULL AUTO_INCREMENT, 
    `ID_akt` int(11) NOT NULL, 
    `hemija` varchar(30) NOT NULL, 
    `kol` int(11) NOT NULL, 
    `jmere` varchar(5) NOT NULL, 
    PRIMARY KEY (`ID`) 
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; 

我也有值的输入字段HTML：

<input id="akt_djubrenje" name="akt_djubrenje" type="text" placeholder="1" value="1" class="form-control input-md"> 

我需要怎么从mysql中取数据，其中ID_akt = $_POST['akt_djubrenje']

所以我w RITE这个PHP PDO文件：

try { 
     /* Establish the database connection */ 
     $conn = new PDO("mysql:host=localhost;dbname=$dbname", $username, $password); 
     $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

     $statement->execute(array(':akt_djubrenje' => $_POST['akt_djubrenje'])); 

     $result = $conn->query('SELECT * FROM akt_djubrenje where ID_akt = :akt_djubrenje"'); 



     $rows = array(); 
     $table = array(); 
     $table['cols'] = array(

     array('label' => 'ID', 'type' => 'number'), 
     array('label' => 'Hemija', 'type' => 'string'), 
     array('label' => 'Kolicina', 'type' => 'number'), 
     array('label' => 'Jed.mere', 'type' => 'string') 

    ); 
     foreach($result as $r) { 
      $temp = array(); 
      // the following line will be used to slice the Pie chart 
      $temp[] = array('v' => (int) $r['ID']); 
     $temp[] = array('v' => (string) $r['hemija']); 
     $temp[] = array('v' => (int) $r['kol']); 
     $temp[] = array('v' => (int) $r['jmere']); 

      $rows[] = array('c' => $temp); 
     } 

    $table['rows'] = $rows; 

    $jsonTable = json_encode($table); 
    } catch(PDOException $e) { 
     echo 'ERROR: ' . $e->getMessage(); 
    } 
    echo $jsonTable; 

也是我称之为PHP文件使用Ajax：

  function tabela() { 
       var json = $.ajax({ 
       url: 'getdjubrenje.php', // make this url point to the data file 
       dataType: 'json', 
       async: false 
      }).responseText; 


    var data = new google.visualization.DataTable(json); 


    visualization = new google.visualization.Table(document.getElementById('akt_djubrenje')); 
    visualization.draw(data, null); 
} 

但是，我得到什么？

任何人都可以看到这里有什么问题，以及我如何解决它？

还当我运行PHP文件，我得到：Fatal error: Call to a member function execute() on a non-object in /home/agroagro/public_html/getdjubrenje.php on line 18

UPDATE：

Answer 1

您需要查询下移动​​命令，还需要使用与查询

$result = $conn->query("SELECT * FROM akt_djubrenje where ID_akt = :akt_djubrenje"); 
$result->execute(array(':akt_djubrenje' => $_POST['akt_djubrenje'])); 

创建的对象

来自文档

• call PDOStatement::bindParam() to bind PHP variables to the parameter markers: bound variables pass their value as input and receive the output value, if any, of their associated parameter markers
• or pass an array of input-only parameter values

了解更多here

Answer 2

你需要从你的Ajax调用

 $('#akt_djubrenje').on('click',function() { 
      var data=$(this).val(); 
      $.ajax({ 
       url: 'getdjubrenje.php', // make this url point to the data file 
       dataType: 'json', 
       data:{'akt_djubrenje':data}, 
       async: false, 
       success:function(json){ 
        var data = new google.visualization.DataTable(json); 
        visualization = new google.visualization.Table(document.getElementById('akt_djubrenje')); 
        visualization.draw(data, null); 
       } 
      }); 
     }); 

数据传递到服务器脚本在服务器端，调用$_POST['akt_djubrenje']检索从HTML文件传递的数据。

快乐编码:)