PHP如何将DB查询的一部分放入函数中_Php_Mysql

PHP如何将DB查询的一部分放入函数中

php mysql

PHP如何将DB查询的一部分放入函数中,php,mysql,Php,Mysql,几天来，我一直在为此事绞尽脑汁。我终于让步了，现在正在寻求帮助我有这两套代码可以工作这个函数调用下面的函数，并将“IS NULL”传递给另一个函数，另一个函数显示数据 <html> <head> <link rel="stylesheet" href="style.css"> <title>My PHP</title> </head> <body> <div class="body">

几天来，我一直在为此事绞尽脑汁。我终于让步了，现在正在寻求帮助

我有这两套代码可以工作

这个函数调用下面的函数，并将“IS NULL”传递给另一个函数，另一个函数显示数据

<html>
<head>
   <link rel="stylesheet" href="style.css">
   <title>My PHP</title>
</head>
<body>

<div class="body">

 <?php 
    require_once 'ShowInventory.php';
    DBShowInventory("IS NULL");
 ?> 
 </div>
 </body>
</html>




<?php
function DBShowInventory($WhichInventory){

require_once 'connection.php';
$conn = Connect();

$result = $conn->query("select Description, PartNumber, Serial, Store, Cost, MSRP, DateReceived from inventory where DateSold $WhichInventory;");
echo "</br></br></br>\r\n";
echo "<table class=\"center\"> \r\n";
echo ' <tr>';
echo '    <th>Description</th>';
echo '    <th>Part Number</th>';
echo '    <th>Serial</th>';
echo '    <th>Store</th>';
echo '    <th>Cost</th>';
echo '    <th>MSRP</th>';
echo '    <th>DateReceived</th>';
echo " </tr> \r\n";

while ($row = $result->fetch_assoc()) {
              unset($Description, $PartNumber, $Serial, $Store, $Cost, $MSRP, $DateReceived);
              $Description = $row['Description'];
              $PartNumber = $row['PartNumber'];               
              $Serial = $row['Serial'];
              $Store = $row['Store'];
              $Cost = $row['Cost'];
              $MSRP = $row['MSRP'];
              $DateReceived = $row['DateReceived'];
              echo "<tr> \r\n";
              echo "<td>" .$Description. "</td> \r\n";
              echo "<td>" .$PartNumber. "</td> \r\n";
              echo "<td>" .$Serial. "</td> \r\n";
              echo "<td>" .$Store. "</td> \r\n";  
              echo "<td>";
              echo "₱";
              echo number_format($Cost,2,'.',',');
              echo "</td> \r\n";
              echo "<td>";
              echo "₱";
              echo number_format($MSRP,2,'.',',');
              echo "</td> \r\n";
              echo "<td>" .$DateReceived. "</td> \r\n";           
              echo "</tr> \r\n";

}
echo "</table> \r\n";
}
 ?>


我的PHP

我希望做的是翻转逻辑，让脚本在顶部显示，并使用底部的脚本只执行数据库查询。这样我就可以一遍又一遍地为不同的事情使用这个函数

我试过这样做，但我得到的只是一张重复7次的唱片

<?php
function DBLookup($DateSold){
require_once 'connection.php';
$conn = Connect();

$result = $conn->query("select Description, PartNumber, Serial, Store, Cost, MSRP, DateReceived from inventory where DateSold $DateSold;");

$row = (array) $result->fetch_assoc();
return $row;
}
?>

这是我想要用来处理$row的脚本

<html>
<head></head>
<body>

<?php
require_once 'GetMultiRecordFromDB.php';
$row=DBLookup("IS NULL");

    echo "</br></br></br>\r\n";
    echo "<table class=\"center\"> \r\n";
    echo ' <tr>';
    echo '    <th>Description</th>';
    echo '    <th>Part Number</th>';
    echo '    <th>Serial</th>';
    echo '    <th>Store</th>';
    echo '    <th>Cost</th>';
    echo '    <th>MSRP</th>';
    echo '    <th>DateReceived</th>';
    echo " </tr> \r\n";

 foreach($row as $rowdata) {
              unset($Description, $PartNumber, $Serial, $Store, $Cost, $MSRP, $DateReceived);
              $Description = $rowdata['Description'];
              $PartNumber = $rowdata['PartNumber'];               
              $Serial = $rowdata['Serial'];
              $Store = $rowdata['Store'];
              $Cost = $rowdata['Cost'];
              $MSRP = $rowdata['MSRP'];
              $DateReceived = $rowdata['DateReceived'];
              echo "<tr> \r\n";
              echo "<td>" .$Description. "</td> \r\n";
              echo "<td>" .$PartNumber. "</td> \r\n";
              echo "<td>" .$Serial. "</td> \r\n";
              echo "<td>" .$Store. "</td> \r\n";  
              echo "<td>";
              echo "₱";
              echo number_format($Cost,2,'.',',');
              echo "</td> \r\n";
              echo "<td>";
              echo "₱";
              echo number_format($MSRP,2,'.',',');
              echo "</td> \r\n";
              echo "<td>" .$DateReceived. "</td> \r\n";           
              echo "</tr> \r\n";

}

    echo "</table> \r\n";

?>
</body>
</html>

谢谢大家期待您的回复。

您通常会在一个循环中检索数据，并将一组记录传回

function DBLookup($DateSold){
    require_once 'connection.php';
    $conn = Connect();

    $result = $conn->query("select Description, PartNumber, Serial, Store, Cost, MSRP, DateReceived from inventory where DateSold $DateSold;");

    $data = array();
    while ($row = $result->fetch_assoc())  {
       $data[] = $row;
    }
    return $data;
}

您应该查看准备好的语句，以防止各种形式的注入，但当使用此语句进行替换时，它不适合。确保你对这一点感到满意，因为这可能会被滥用

如果将连接传递到方法中，也会“更好”，因此

function DBLookup($DateSold, $conn){

这使您可以控制正在使用的连接，而不是总是创建自己的功能。

请参见非常感谢Nigel，它非常有效。我为问这样一个新手问题感到难过。我又是一个新手了。