数据库查询php MySQL - 没有显示搜索结果

时间:2012-12-07 05:27:28

标签: php mysql forms form-submit

(问题非常详细,太长时间没有阅读:“我的猜测是我正在使用错误的MYSQL_FETCH_ARRAY。”)

您好!以下代码的目的是在数据库中进行基本搜索。数据通过表单传递。我使用的教程是由''Frost of Slunked.com'编写的,它是一个基本的注册/登录php MySQL教程,完美地运行。我设法编写了一个woking table-updater函数和form-submit来向所选内容添加新数据(以便按预期工作。

config.php - 同步到MySQL服务器,选择数据库,启动会话,需要functions.php(包括作者评论)

<?php
/*****************************
    File: includes/config.php
    Written by: Frost of Slunked.com
    Tutorial: User Registration and Login System
******************************/
// start the session before any output.
session_start();

// Set the folder for our includes
$sFolder = ''; 

/***************
    Database Connection 
        You will need to change the user (user) 
        and password (password) to what your database information uses. 
        Same with the database name if you used something else.
****************/
mysql_connect('localhost', 'myusername', 'mypassword') or trigger_error("Unable to connect to the database: " . mysql_error());
mysql_select_db('tormex') or trigger_error("Unable to switch to the database: " . mysql_error());

/***************
    password salts are used to ensure a secure password
    hash and make your passwords much harder to be broken into
    Change these to be whatever you want, just try and limit them to
    10-20 characters each to avoid collisions. 
****************/
define('SALT1', '24859f@#$#@$');
define('SALT2', '^&@#_-=+Afda$#%');

// require the function file
require_once 'functions.php';

// default the error variable to empty.
$_SESSION['error'] = "";

// declare $sOutput so we do not have to do this on each page.
$sOutput="";
?>

functions.php - 具有多个功能(login,createRide,Register等)。大多数函数的目的是从提交的HTML表单中获取值,然后维护所需的操作 - 我只会提到我的searchRide函数(在我的猜测中有错误或至少,必须对它做一些事情)和createRide功能正常。

<?php ...

unction searchRide($pWhen_min, $pWhen_max, $pFrom, $pTo){
    if (!empty($pWhen_min) && !empty($pWhen_max) && !empty($pFrom) && !empty($pTo)) {
        global $sql2, $query2;
        $sql2 = "SELECT * FROM ride WHERE `from` ='$pFrom' AND `to` = '$pTo' AND `when` >= '$pWhen_min' AND `when` <= '$pWhen_max' ";
        $query2 = mysql_query($sql2) or trigger_error("Query Failed: " . mysql_error());
    }
}
function createRide($pFrom, $pTo, $pWhen, $pSeats, $pPrice, $pCar){
    if (!empty($pFrom) && !empty($pTo) && !empty($pWhen) && !empty($pSeats) && !empty($pPrice) && !empty($pCar)){
        $sql = "SELECT id FROM users WHERE username= '" . $username . "' LIMIT 1";
        $result = mysql_query($sql);
        if(!$result) {
            trigger_error("ELKURTAD " . mysql_error());
        }
        $row = mysql_fetch_array($result);
        $sql = "INSERT INTO ride (`from`, `to`, `when`, `seats`, `price`, `car`, `u_id`)
        VALUES ('" . $pFrom . "', '" . $pTo . "', '" . $pWhen . "', 
        '" . $pSeats . "', '" . $pPrice . "', '" . $pCar . "', '" . $result . "');";


        $query = mysql_query($sql) or trigger_error("Query Failed: " . mysql_error());

        if ($query) {
            return TRUE;
        } 
    }
    return FALSE;
}

...?>

searchRide.php - 检查专用于获取搜索过滤器值的变量是否具有任何值; (在else语句中)如果没有值,则表单未提交并显示searchRide表单,结果后传递searchRide.php的变量($ _SERVER ['PHP_SELF'])

<?php
require_once 'config.php';

$sOutput .= '<div id="searchRide-body">';

if (isset($_GET['action'])) {
    switch (strtolower($_GET['action'])) {
        case 'searchride':
        if (isset($_POST['when_min']) && isset($_POST['when_max']) && isset($_POST['from']) && isset($_POST['to'])) {
            if (searchRide($_POST['when_min'], $_POST['when_max'], $_POST['from'], $_POST['to'])) {
                while($row = mysql_fetch_array($query2)){
                    $sOutput .= "' ID: '" .$row['id'] . "' <br />
                    When: '" . $row['when'] . "' <br />
                    From: '" . $row['from'] . "' <br />
                    To: '" . $row['to'] . "' <br />
                    Seats left: '" . $row['seats'];

                }
            }
        }
    }
}else{
    if (isset($_SESSION['error'])) {
        $sError = '<span id="error">' . $_SESSION['error'] . '</span><br />';
    }

    $sOutput .= '<h2>Search for rides</h2>
        ' . $sError . '
        <form name="searchride" method="post" action="' . $_SERVER['PHP_SELF'] . '?action=searchride">
            From: <input type="text" name="from" value=* /><br />
            To: <input type="text" name="to" value=* />
            When_min: <input type="text" name="when_min" value=* />
            When_max: <input type="text" name="when_max" value=* />
            <br /><br />
            <input type="submit" name="submit" value="Search" />
        </form>
        <br />
        <h4>Would you like to <a href="index.php">Go back?</a></h4>';
}   
echo $sOutput . "<br />";

echo "TEST string" . "<br />";
echo $query2 . " query2<br /> ";
echo $sql2 . " sql2<br />";
echo $row . "<br />";
?>

在此代码的末尾您可以看到一些打印的变量,用于在提交searRide表单后检查它们的值。 我使用以下数据更新了我的数据库,并使用phpMyAdmin检查了确切的值,以便我可以使用现有数据测试搜索:

来自:TEST01 收件人:TEST02 时间:500 座位:5 价格:7 汽车:沃尔沃

使用searchRide表单提交的测试数据: 来自:TEST01 收件人:Test02 When_min:1 Whn_max:3000

按下searchRide表单上的搜索按钮后,这些是以下结果(浏览器显示的内容):

(s输出变量

TEST WRITE TEXT

资源ID#5(query2变量

SELECT * FROM ride WHERE from ='TEST01'和to ='TEST02'和when&gt; ='1'和when&lt; ='5000 '(sql2变量

(行变量

在此之后,我在phpMyAdmin SQL命令行中插入了SQL查询,并生成了我正在搜索的数据。

在google,php.net和w3chools.com上用我自己的知识和各种搜索来尝试多次弄清楚可能出现什么问题。 我的猜测是我使用MYSQL_FETCH_ARRAY错误。

1 个答案:

答案 0 :(得分:1)

以下条件不起作用

if (searchRide($_POST['when_min'], $_POST['when_max'], $_POST['from'], $_POST['to'])) {

因为你没有从searchRide函数返回任何值,你需要返回true以进入条件。