Question

我正在开发一个针对uni的小型网络应用程序，其中一个要求是它必须有一个列表，其中包含来自数据库的数据，可以通过单击某个类别进行排序，然后只需单击该项目中的项目。类别将显示。我已设法将数据库中的数据检索到网站上的表格中，但是，下拉菜单选择您要查看的类别不起作用。这意味着它显示数据库中的所有项目，无论如何。我没有收到任何错误，真的不知道如何解决这个问题。希望有人能够帮助我。该函数的代码应该只显示该类别的项目：

//Get ItemEntity objects from the database and return them in an array.
function GetItemByCategory($category) {
    // require 'dbconnect.php';

    //Open connection and Select database.     
    $con = mysqli_connect("localhost", "root", "", "login") or die(mysqli_error);

    $query = "SELECT * FROM items WHERE category LIKE '$category'";
    $result = mysqli_query($con, $query) or die(mysqli_error($con));
    $itemArray = array();

    //Get data from database.
    while ($row = mysqli_fetch_array($result)) {

        $name = $row[1];
        $category = $row[2];
        $place = $row[3];
        $date = $row[4];
        $description = $row[5];
        $image = $row[6];

        //Create item objects and store them in an array.
        $item = new ItemEntity(-1, $name, $category, $place, $date, $description, $image);
        array_push($itemArray, $item);
    }
    //Close connection and return result
    mysqli_close($con);
    return $itemArray;
}

}

我还是很陌生，所以它可能是一个简单的修复，但就像我说的那样，我迷失了，所以这就是我伸出手的原因。在此先感谢您，如果您需要我的更多代码，请告诉我。

//编辑显示数据的HTML表单。如果需要其他任何东西，请告诉我。谢谢你的帮助。

function CreateItemTables($categories)
    {
        $itemModel = new ItemModel();
        $itemArray = $itemModel->GetItemByCategory($categories);
        $result = "";

        // Generate an item table for each item entity in the array
        foreach ($itemArray as $key => $item) {
            $result = $result . "<table class = 'itemTable'>
                                <tr>
                                    <th rowspan='6' width = '150px' ><img runat = 'server' src = '$item->image'/></th>
                                    <th width = '75px' >Name: </th>
                                    <td>$item->name</td>
                                </tr>

                                <tr>
                                    <th>Category: </th>
                                    <td>$item->category</td>
                                </tr>

                                <tr>
                                    <th>Place: </th>
                                    <td>$item->place</td>
                                </tr>

                                <tr>
                                    <th>Date: </th>
                                    <td>$item->date</td>
                                </tr>

                                <tr>
                                    <td colspan='2' >$item->description</td>
                                </tr>


                                </table>";
        }
        return $result;
    }

//编辑2整个ItemController类

<?php

require ("Model/ItemModel.php");

/**
* Contains non-db related functions for the Item page
*/
class ItemController
{

    function CreateItemDropdownList()
    {
        $itemModel = new ItemModel();
        $result = "<form action = '' method = 'post' width = '200px'>
                    Please select a category: <select name = 'types' >
                    <option value = '%' >ALL</option>".$this->CreateOptionValues($itemModel->GetCategories())."
                    </select>
                    <input type = 'submit' value = 'Search'  /></form>";

                return $result;
    }
    function CreateOptionValues(array $valueArray)
    {
        $result = "";

        foreach ($valueArray as $value) 
        {
            $result = $result . "<option value ='$value'>$value</option>";
        }
        return $result;
    }

    function CreateItemTables($categories)
    {
        $itemModel = new ItemModel();
        $itemArray = $itemModel->GetItemByCategory($categories);
        $result = "";

        // Generate an item table for each item entity in the array
        foreach ($itemArray as $key => $item) {
            $result = $result . "<table class = 'itemTable'>
                                <tr>
                                    <th rowspan='6' width = '150px' ><img runat = 'server' src = '$item->image'/></th>
                                    <th width = '75px' >Name: </th>
                                    <td>$item->name</td>
                                </tr>

                                <tr>
                                    <th>Category: </th>
                                    <td>$item->category</td>
                                </tr>

                                <tr>
                                    <th>Place: </th>
                                    <td>$item->place</td>
                                </tr>

                                <tr>
                                    <th>Date: </th>
                                    <td>$item->date</td>
                                </tr>

                                <tr>
                                    <td colspan='2' >$item->description</td>
                                </tr>


                                </table>";
        }
        return $result;
    }
}
?>

Answer 1

 //changed like to = more accurate 
$query = "SELECT * FROM items WHERE category = '$category'";
    $result = mysqli_query($con, $query) or die(mysqli_error($con));
    $itemArray = array();

    //Get data from database.
//note this
$i=0;   

 while ($row = mysqli_fetch_array($result)) {
        //gave then a record number so you get the right data
        $name = $row[$i];
        $category = $row[$i];
        $place = $row[$i];
        $date = $row[$i];
        $description = $row[$i];
        $image = $row[$i];
$item = new ItemEntity($i, $name, $category, $place, $date, $description, $image);
$i++;

从MySQL检索选定的数据

1 个答案: