Question

我正在尝试创建一个简单的php，sql搜索引擎，它将从我的数据库中选择“LIKE”关键字（查询）并显示它。但它不会起作用。它只显示文本“问题”（见第32行），经过数小时的故障排除后，我仍然无法解决这个问题。

<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Search Engine Test</title>
</head>
<body>
<script language="php">
// Create a database connection
$connection = mysql_connect("*****","*****","*****");   
if (!connection) {
    die ("Please reload page. Database connection failed: " . mysql_error());
}

// Select a databse to use
$db_select = mysql_select_db("*****",$connection);
if (!$db_select) {
    die("Please reload page. Database selection failed: " . mysql_error());
}

// Search Engine
// Only execute when button is pressed
if (isset($_POST['search'])) {
// Filter
//$keyword = trim ($keyword);
echo $keyword;
// Select statement
$search = mysql_query("SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'");
// Display
$result = @mysql_query($search);
if (!$result){
echo "problem";
exit();
}


while($result = mysql_fetch_array( $search )) 
 { 
 echo $result['cause_name']; 
 echo " ";
 echo "<br>"; 
 echo "<br>"; 
 }
 $anymatches=mysql_num_rows($search); 
 if ($anymatches == 0) 
 { 
 echo "Nothing was found that matched your query.<br><br>"; 
 }
}
</script>
<form action="<?php echo $_SERVER['PHP_SELF']?>" method="post">
<input type="text" name="keyword">
<input type="submit" name="search" value="Search">

</body>
</html>

Answer 1

扩展您的代码，我们可以看到：

$result = @mysql_query($search);

变成：

$result = @mysql_query(mysql_query("SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'"));

这没有多大意义。

将第一行更改为：

$search = "SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'"

或者，而不是分配$search一个值，只需跳过为$result分配$search当前拥有的值。

编辑：帮助您解释：

改变这个：

$search = mysql_query("SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'");
// Display
$result = @mysql_query($search);
if (!$result){
    echo "problem";
    exit();
}

到此：

$result = mysql_query("SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'");
// Display
if (!$result){
    echo "problem";
    exit();
}

Answer 2

尝试并改变：

if (isset($_POST['search'])) { //$_POST['search'] just tells that there are a submit-button when submitting (and the name of it)
// Filter
//$keyword = trim ($keyword);
echo $keyword; //You're echoing out value of $keyword which hasn't been set/assigned
// Select statement

//You're always searching for the word keyword with leading and/or trailing characters
//You're not searching for a dynamically assigned value which I think is what you want
$search = mysql_query("SELECT * FROM tbl_name WHERE cause_name LIKE '%keyword%'");

//You're executing an already defined query (assigned in $search)
$result = @mysql_query($search); //You're suppressing errors, it's bad practice.
if (!$result){
echo "problem";
exit();
}

为：

if (isset($_POST['keyword'])) {
// Filter
$keyword = trim ($_POST['keyword']);

// Select statement
$search = "SELECT * FROM tbl_name WHERE cause_name LIKE '%$keyword%'";
// Display
$result = mysql_query($search) or die('query did not work');

重要！ <script language="php">无效。你应该在php-code和<?php的开头键入?>来结束php-code。

<强>更新您还必须更改此代码：

while($result = mysql_fetch_array( $search )) { echo $result['cause_name']; echo " "; echo " "; echo " "; } $anymatches=mysql_num_rows($search); if ($anymatches == 0) { echo "Nothing was found that matched your query. "; } }

以

while($result_arr = mysql_fetch_array( $result )) { echo $result_arr['cause_name']; echo " "; echo " "; echo " "; } $anymatches=mysql_num_rows($result); if ($anymatches == 0) { echo "Nothing was found that matched your query. "; } }

在制作新代码时，你真的不应该使用mysql _ 函数* ，因为它们已被弃用。相反，请查看PDO或mysqli。

简单的php / sql搜索引擎

2 个答案: