[英]PHP/MYSql PDO Select with variable
Edit: Ok, so while this does work great for $ID
when I set it equal to 28
, it is not working for instance below if I was trying to get the $name = $TableRows['name'];
编辑:好的,所以当我将$ID
设置为28
,这对于$ID
确实很有效,但是如果我尝试获取$name = $TableRows['name'];
,则在下面的实例中不起作用$name = $TableRows['name'];
variable. 变量。 I know I could select it, but other variables require this. 我知道我可以选择它,但是其他变量需要这样做。
$ID = 28;
$name = $TableRows['name'];
try { ini_set('display_errors', true);
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare(" SELECT ? AS name FROM TABLE1 e WHERE id = ?");
$stmt->execute(array($name, $ID));
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) {
echo $v;
}
}
I'm in the process of transitioning from MySQLi to PDO. 我正在从MySQLi过渡到PDO。 My problem is I'd like to modify one of the values in my SELECT
query, similar to how I set my WHERE value of ID
to $ID = 28
. 我的问题是我想修改SELECT
查询中的值之一,类似于将ID
WHERE值设置为$ID = 28
。 Does anyone know how instead of just outputting millisecondstime
from the SELECT query, I could change it to output $minutes $secondsrounded $millisecondsround
instead? 有谁知道如何而不是仅从SELECT查询中输出millisecondstime
时间,而是可以将其更改为输出$minutes $secondsrounded $millisecondsround
? This is the idea that I am going for: 这就是我要的想法:
$stmt = $conn->prepare("SELECT name, $minutes, $secondsrounded, $millisecondsround FROM TABLE1 e
This is my entire query: 这是我的整个查询:
<?php
echo "<center><div style='max-width: 1100px'><table id ='myTable' class='display' cellspacing='0' width='100%'>
<thead>
";
echo "<tr><th>Name</th><th>Time</th></tr></thead>";
class TableRows extends RecursiveIteratorIterator {
function __construct($it) {
parent::__construct($it, self::LEAVES_ONLY);
}
function current() {
return "<td style='width: 150px; border: 1px solid black;'>" . parent::current(). "</td>";
}
function beginChildren() {
echo "<tr>";
}
function endChildren() {
echo "</tr>" . "\n";
}
}
$servername = "localhost";
$username = "";
$password = "";
$dbname = "";
$name = $TableRows['name'];
$milliseconds = $TableRows['millisecondstime'];
$time = $milliseconds / 1000;
$days = floor($time / (24*60*60));
$hours = floor(($time - ($days*24*60*60)) / (60*60));
$minutes = floor(($time - ($days*24*60*60)-($hours*60*60)) / 60);
$seconds = ($time - ($days*24*60*60) - ($hours*60*60) - ($minutes*60)) % 60;
$str_length = 3;
$millisecondsround = substr("000{$milliseconds}", -$str_length);
$secondsrounded = str_pad($seconds, 2, '0', STR_PAD_LEFT);
$ID = 28;
try {
ini_set('display_errors', true);
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $conn->prepare("SELECT name, millisecondstime FROM TABLE1 e
WHERE ID = ?
ORDER BY millisecondstime ASC
");
$stmt->execute(array($ID));
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) {
echo $v;
}
}
catch(PDOException $e) {
echo "Error: " . $e->getMessage();
}
$conn = null;
echo "</table>";
?>
You can use placeholders in the SELECT
list, and they'll be replaced with the values from the parameter array. 您可以在SELECT
列表中使用占位符,它们将被参数数组中的值替换。
$stmt = $conn->prepare("
SELECT name, ? AS minutes, ? AS secondsrounded, ? AS millisecondsround
FROM TABLE1 e
WHERE id = ?");
$stmt->execute(array($minutes, $secondsrounded, $millisecondsround, $ID));
Try this instead: 尝试以下方法:
$stmt = $conn->prepare("SELECT name, millisecondstime FROM TABLE1 e
WHERE ID = :ID
ORDER BY millisecondstime ASC
");
$stmt->execute(array('ID' => $ID));
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