Question

我的php mysql查询无法正常工作，或者至少就是我的假设。如果你们可能注意到我没有看到的东西，我将不胜感激。谢谢！

以下是我收到的错误：

Notice: Trying to get property of non-object in D:\
Fatal error: Call to a member function free() on a non-object in D:\

我有9列varchar：

Part Number,Alternate Partnumber,Qty,
Description,Part Condition Code,Price,
Location,Barcode,Consignment

我创建了一个搜索栏，我希望客户能够输入一个部件号，然后找到该部件号以及该行的所有信息。

我正在使用Luke Welling和Laura Thomson的 Php和Mysql Web Development 所以我正在使用他们的一部分代码。

以下是代码：

<?php
    //create short variable names
    $searchtype = "Part Number";
    $searchterm = $_POST['searchterm'];

    //echo "$searchtype";
    //echo "$searchterm";

    if(!$searchtype || !$searchterm)
    {
        echo 'You must enter a part number please try again';
        exit;
    }

    if(!get_magic_quotes_gpc())
    {
        $searchtype = addslashes($searchtype);
        $searchterm = addslashes($searchterm);
    }

    @ $db = new mysqli('localhost', 'username', 'password', 'partstest');

    if(mysqli_connect_errno())
    {
        echo 'Error: Could not connect to database. Please try again later.';
        exit;
    }

    //$query = "SELECT $searchterm * FROM inventory WHERE Part Number";
    $query = "select * from inventory where " .$searchtype. " like '%".$searchterm."%'";


    $result = $db->query($query);
    //$result = mysqli_query($db, $query);

    $num_results = $result->num_rows;
    //$num_results = mysqli_num_rows($result);

    echo "<p>Number of books found: ".$num_results."</p>";

    for($i = 0; $i < $num_results; $i++)
    {
        $row = $result->fetch_assoc();
        //$row = mysqli_fetch_assoc($result);
        echo "<p><strong>".($i+1).". Part Number: ";
        echo htmlspecialchars(stripslashes($row['Part Number']));
        echo "</strong><br /> Alternate Part Number: ";
        echo stripslashes($row['Alternate Part Number']);
        echo "<br />Qty: ";
        echo stripslashes($row['Qty']);
        echo "<br />Description: ";
        echo stripslashes($row['Description']);
        echo "<br />Part Condition: ";
        echo stripslashes($row['Part Condition']);
        echo "<br />Price: ";
        echo stripslashes($row['Price']);
        echo "<br />Location: ";
        echo stripslashes($row['Location']);
        echo "<br />Barcode: ";
        echo stripslashes($row['Barcode']);
        echo "<br />Consignment: ";
        echo stripslashes($row['Consignment']);
        echo "</p>";

    }

    $result->free();
    //mysqli_free_result($result);
    $db->close();

    ?>

Answer 1

请您发布以下代码的输出：

var_dump(get_object_vars($result));

由于错误的@

，似乎你的$ db是空的

Answer 2

你的“$ db”对象似乎是空的，因为你写了这个：

@ $db = new mysqli('localhost', 'username', 'password', 'partstest');

但@在这里是错误的，你也应该查看错误php-doc并对你的对象做一些“回声”，看它们是假的还是空的

php mysql查询不能正常发布错误

2 个答案: