我一直关注此链接作为我的搜索栏的指南 https://www.youtube.com/watch?v=Wvs6sbLN3NI&t=678s
我是php和sql的初学者，请帮我解决这个问题。 我不知道在sql语法中做什么。 错误是，注意：未定义的变量：第21行的C：\ xampp \ htdocs \ login-system \ search.php中的q 提前谢谢。
<?php
$con = mysql_connect('localhost','root','');
$db = mysql_select_db('accounts');
?>
<!DOCTYPE html>
<html>
<head>
<title> Search Form </title>
<link rel="stylesheet" type="text/css" href="css/stylesearch.css">
</head>
<body>
<form action = "search.php" method ="GET" id="searchForm">
<input type="text" name="q" id="searchBox" placeholder="Search Here" value="" /><input type="submit" id="searchBtn" value ="GO" />
</form>
<?php
$query = mysql_query("SELECT * FROM provider WHERE provider LIKE '%$q%' OR broker LIKE '%$q%' OR deductible LIKE '%$q%' OR deductible_waiver LIKE '%$q%' OR accredited_banks LIKE '%$q%' OR can_not_offer_mortgaged_with LIKE '%$q%' OR casa_eligibility LIKE '%$q%' OR depreciation LIKE '%$q%' OR special_quotes LIKE '%$q%' OR unit_age_limit LIKE '%$q%' OR provider_information LIKE '%$q%' OR provider_branches LIKE '%$q%' OR mmx_exclusive LIKE '%$q%' OR disclaimer LIKE '%$q%' OR accredited_shops LIKE '%$q%' OR roadside_assistance_number LIKE '%$q%' OR roadside_assistance_coverage LIKE '%$q%' OR check_addressee LIKE '%$q%' OR accounts_details LIKE '%$q%' OR cancellation_charge LIKE '%$q%'");
$num_rows = mysql_num_rows($query);
while($row = mysql_fetch_array($query))
{
$id = $row['id'];
$prov = $row['provider'];
$brok = $row['broker'];
$deduc = $row['deductible'];
$deduc_waiver = $row['deductible_waiver'];
$accre_banks = $row['accredited_banks'];
$mort = $row['can_not_offer_mortgaged_with'];
$casa_elig = $row['casa_eligibility'];
$depre = $row['depreciation'];
$s_quotes = $row['special_quotes'];
$age = $row['unit_age_limit'];
$prov_info = $row['provider_information'];
$prov_branch = $row['provider_branches'];
$mmx_exclusive = $row['mmx_exclusive'];
$disclaimer = $row['disclaimer'];
$accre_shops = $row['accredited_shops'];
$roadside_assist_no = $row['roadside_assistance_number'];
$roadside_assist_cov = $row['roadside_assistance_coverage'];
$check_addressee = $row['check_addressee'];
$acc_details = $row['accounts_details'];
$can_charge = $row['cancellation_charge'];
echo '<h3>' .$prov .'</h3><p>'. $brok.'<br>'. $deduc.'<br>'. $deduc_waiver.'<br>'. $accre_banks.'<br>'. $mort.'<br>'. $casa_elig.'<br>'. $depre.'<br>'. $s_quotes.'<br>'. $age.'<br>'. $prov_info.'<br>'. $prov_branch.'<br>'. $mmx_exclusive.'<br>'. $disclaimer.'<br>'. $accre_shops.'<br>'. $roadside_assist_no.'<br>'. $roadside_assist_cov.'<br>'. $acc_details.'<br>'. $check_addressee.'<br>'. $can_charge.'</p><br />';
}
?>
</body>
</html>
答案 0 :(得分：0)
你并没有真正说明你的问题在这里。只是查看你的代码，你不是在你的mysqli查询中调用你的数据库，它应该是mysqli_query（$ db，＆＃34; SELECT ....＆＃34;），其中$ db是你的mysqli_connect变量。 php手册中有几个例子：http://php.net/manual/en/mysqli.query.php。
正如mickmacusa上面所说，如果你在后端添加＆＃34;或者死（mysqli_error（$ db）＆＃34;它将为你提供有关你的sql语法的更多信息。< / p>
答案 1 :(得分：0)
警告mysql_query，mysql_fetch_array，mysql_connect等..扩展在PHP 5.5.0中已弃用，并且已在PHP 7.0.0中删除。 相反，应该使用MySQLi或PDO_MySQL扩展。
1）尝试使用mysqli_*或PDO预备语句
2）首先按照我的示例代码
3）从变量$ q开始。你必须将post值分配给$ q变量，如$ q = $ _ GET [＆＃39; q＆＃39;];否则你会得到$q undefined error
//db connection
global $conn;
$servername = "localhost"; //host name
$username = "username"; //username
$password = "password"; //password
$mysql_database = "dbname"; //database name
//mysqli prepared statement
$conn = mysqli_connect($servername, $username, $password) or die("Connection failed: " . mysqli_connect_error());
mysqli_select_db($conn,$mysql_database) or die("Opps some thing went wrong");
$stmt = $conn->prepare("SELECT * FROM provider
WHERE provider LIKE %'".$q."'%
OR broker LIKE %'".$q."'%
OR deductible LIKE %'".$q."'%
OR deductible_waiver LIKE %'".$q."'%
OR accredited_banks LIKE %'".$q."'%
OR can_not_offer_mortgaged_with LIKE %'".$q."'%
OR casa_eligibility LIKE %'".$q."'%
OR depreciation LIKE %'".$q."'%
OR special_quotes LIKE %'".$q."'%
OR unit_age_limit LIKE %'".$q."'%
OR provider_information LIKE %'".$q."'%
OR provider_branches LIKE %'".$q."'%
OR mmx_exclusive LIKE %'".$q."'%
OR disclaimer LIKE %'".$q."'%
OR accredited_shops LIKE %'".$q."'%
OR roadside_assistance_number LIKE %'".$q."'%
OR roadside_assistance_coverage LIKE %'".$q."'%
OR check_addressee LIKE %'".$q."'%
OR accounts_details LIKE %'".$q."'%
OR cancellation_charge LIKE %'".$q."'%");
$stmt->execute();
$get_result =$stmt->get_result();
$row_count= $get_result->num_rows;
?>
<!DOCTYPE html>
<html>
<head>
<title> Search Form </title>
<link rel="stylesheet" type="text/css" href="css/stylesearch.css">
</head>
<body>
<form action = "search.php" method ="GET" id="searchForm">
<input type="text" name="q" id="searchBox" placeholder="Search Here" value="" /><input type="submit" id="searchBtn" value ="GO" />
</form>
<?php
if($row_count>0)
{
while($row = $get_result->fetch_assoc() )
{
$id = $row['id'];
$prov = $row['provider'];
$brok = $row['broker'];
$deduc = $row['deductible'];
$deduc_waiver = $row['deductible_waiver'];
$accre_banks = $row['accredited_banks'];
$mort = $row['can_not_offer_mortgaged_with'];
$casa_elig = $row['casa_eligibility'];
$depre = $row['depreciation'];
$s_quotes = $row['special_quotes'];
$age = $row['unit_age_limit'];
$prov_info = $row['provider_information'];
$prov_branch = $row['provider_branches'];
$mmx_exclusive = $row['mmx_exclusive'];
$disclaimer = $row['disclaimer'];
$accre_shops = $row['accredited_shops'];
$roadside_assist_no = $row['roadside_assistance_number'];
$roadside_assist_cov = $row['roadside_assistance_coverage'];
$check_addressee = $row['check_addressee'];
$acc_details = $row['accounts_details'];
$can_charge = $row['cancellation_charge'];
echo '<h3>' .$prov .'</h3><p>'. $brok.'<br>'. $deduc.'<br>'. $deduc_waiver.'<br>'. $accre_banks.'<br>'. $mort.'<br>'. $casa_elig.'<br>'. $depre.'<br>'. $s_quotes.'<br>'. $age.'<br>'. $prov_info.'<br>'. $prov_branch.'<br>'. $mmx_exclusive.'<br>'. $disclaimer.'<br>'. $accre_shops.'<br>'. $roadside_assist_no.'<br>'. $roadside_assist_cov.'<br>'. $acc_details.'<br>'. $check_addressee.'<br>'. $can_charge.'</p><br />';
}
}
$stmt->close();
$conn->close();
?>
</body>
</html>