如何正确地将PHP脚本转换为PDO？

Question

我有很多需要转换为PDO的脚本。我的脚本在mysqli_中，我一直在网上阅读不同的方式来做同样的事情。有人能解释一下这些差异吗？

再次，对不起，如果我要求简单的东西，但在线文件混淆了我。

在此先感谢。

我原来的PHP脚本mysqli_：

<?php 
include 'db_conn_pdo.php'; 

//preparing query 


$desk_query = "SELECT 
           coordinate_id, 
           x_coord, 
           y_coord, 
           section_name, 
           station_number, 
           ver_hor 
          FROM coordinates"; 


$station_query = "SELECT 
            coordinate_id, 
           section_name, 
           station_number, 
           x_coord, 
           y_coord, 
           username, 
           hostname 
           FROM 
           sandbox_maesc4.coordinates c 
           INNER JOIN 
           softphone_materials_updater.workstations w 
           ON w.pod = c.station_number 
           INNER JOIN 
           sandbox_maesc4.workstation_userlogged wsu 
           ON w.ws = wsu.hostname 
           WHERE wsu.lastupdate >= CURRENT_TIMESTAMP - INTERVAL 10 MINUTEs";  
/**************************/ 

$desk_stmt = $dbh->query($desk_query); 

while($row = $desk_stmt -> fetch(PDO::FETCH_ASSOC)){ 
       $id  = $row['coordinate_id']; 
       $x_pos = $row['x_coord']; 
       $y_pos = $row['y_coord']; 
       $sec_name = $row['section_name']; 
       $sta_num = $row['station_number']; 
       $position = $row['ver_hor']; 

       $class = 'desk_box_ver'; 
       if($position == 'horizontal'){ 
        $class = 'desk_box_hor'; 
       } 
        echo '<div class="' . $class . '" data-rel="' . $id . '" style="left:' . $x_pos . 'px;top:' . $y_pos.'px;">' . $sta_num . '</div>' . "\n"; 
      } 

$station_stmt = $dbh->query($station_query); 

while($row = $station_stmt -> fetch(PDO::FETCH_ASSOC)){ 
$id  = $row['coordinate_id']; 
    $sec_name = $row['section_name']; 
    $sta_num = $row['station_number']; 
    $x_pos = $row['x_coord']; 
    $y_pos = $row['y_coord']; 

echo '<div class="station_info_" id="station_info_' . $id . '" style="left:' . $x_pos . 'px;top:' . $y_pos . 'px;"><p class="numb">Section:' . $sec_name . '<br>Station:' . $sta_num . '<br></p></div>' . "\n"; 
}//end while 
?> 

是什么在PDO这两者之间的区别：

$station_stmt = $dbh->query($station_query); 
//and 
$station_stmt = self::$tdb->prepare($station_query); 

，我怎么能使用mysqli_这两条线检查我的查询在PDO中是否有效

$station_result = mysqli_query($conn,$station_query); 

if($station_result === false) { 
    die(mysqli_error()); 
} 

对于mysqli_ while循环PDO我用这个：

while($row = $station_stmt -> fetch(PDO::FETCH_ASSOC)) 

有没有这样做它的另一种方式？

最后，在脚本的顶部是否包含连接，如mysqli_中的一个好主意？

谢谢

Answer 1

What is the difference between these two in PDO:

$station_stmt = $dbh->query($station_query); $station_stmt = self::$tdb->prepare($station_query);

第一种是直的查询，其不备（如：SELECT * FROM station）。

第二个正在准备（如：SELECT * FROM desk WHERE id = ?）

仅当查询没有参数时才使用query()

当您想要绑定val时使用prepare() UE能够查询

and how can I use these two lines in mysqli_ to check if my query is good in PDO

$station_result = mysqli_query($conn,$station_query); if($station_result === false) { die(mysqli_error()); }

它是一回事，是否query()回报false：

$station_stmt = $dbh->query($station_query); 
if (!$station_stmt) { 
    echo "\nPDO::errorInfo():\n"; 
    print_r($dbh->errorInfo()); 
    die(); 
} 

For mysqli_ while loop in PDO I used this: while($row = $station_stmt -> fetch(PDO::FETCH_ASSOC))

PDO提供fetchAll()，你可以用它在一次获取所有行：

$row = $station_stmt -> fetchAll(PDO::FETCH_ASSOC); 

---

MINUTE概不 s

CURRENT_TIMESTAMP - INTERVAL 10 MINUTE 

试试这个方法：

$dsn = 'mysql:dbname=testdb;host=127.0.0.1'; 
$user = 'dbuser'; 
$password = 'dbpass'; 

try { 
    $dbh = new PDO($dsn, $user, $password); 
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

    if(!$dbh){ 
     echo "\nPDO::errorInfo():\n"; 
     print_r($dbh->errorInfo()); 
     die(); 
    } 

    get_desk_coordinates($dbh); 
    get_station_coordinates($dbh); 


} catch (PDOException $e) { 
    echo 'Connection failed: ' . $e->getMessage(); 
} 


/** 
* @param $dbh 
*/ 
function get_desk_coordinates($dbh) 
{ 
    $desk_query = "SELECT 
        coordinate_id, 
        x_coord, 
        y_coord, 
        section_name, 
        station_number, 
        ver_hor 
       FROM coordinates"; 

    $desk_stmt = $dbh->query($desk_query); 

    while ($row = $desk_stmt->fetch(PDO::FETCH_ASSOC)) { 
     $id = $row['coordinate_id']; 
     $x_pos = $row['x_coord']; 
     $y_pos = $row['y_coord']; 
     $sec_name = $row['section_name']; 
     $sta_num = $row['station_number']; 
     $position = $row['ver_hor']; 

     $class = 'desk_box_ver'; 
     if ($position == 'horizontal') { 
      $class = 'desk_box_hor'; 
     } 
     echo '<div class="' . $class . '" data-rel="' . $id . '" style="left:' . $x_pos . 'px;top:' . $y_pos . 'px;">' . $sta_num . '</div>' . "\n"; 
    } 
} 



/** 
* @param $dbh 
*/ 
function get_station_coordinates($dbh) 
{ 
    $station_query = " SELECT 
        coordinate_id, 
        section_name, 
        station_number, 
        x_coord, 
        y_coord, 
        username, 
        hostname 
        FROM sandbox_maesc4.coordinates c 
        INNER JOIN 
        softphone_materials_updater.workstations w 
        ON w.pod = c.station_number 
        INNER JOIN 
        sandbox_maesc4.workstation_userlogged wsu 
        ON w.ws = wsu.hostname 
        WHERE wsu.lastupdate >= CURRENT_TIMESTAMP - INTERVAL 10 MINUTE"; 

    $station_stmt = $dbh->query($station_query); 

    while ($row = $station_stmt->fetch(PDO::FETCH_ASSOC)) { 
     $id = $row['coordinate_id']; 
     $sec_name = $row['section_name']; 
     $sta_num = $row['station_number']; 
     $x_pos = $row['x_coord']; 
     $y_pos = $row['y_coord']; 

     echo '<div class="station_info_" id="station_info_' . $id . '" style="left:' . $x_pos . 'px;top:' . $y_pos . 'px;"><p class="numb">Section:' . $sec_name . '<br>Station:' . $sta_num . '<br></p></div>' . "\n"; 
    } 
    //end while 
}