Php 如何从mysql表中查询搜索结果？

我已经做了一个产品上传从和它的作品成功。但现在我想创建一个搜索表单，这样任何人都可以通过搜索产品标题、类别或价格来显示结果。我的表格包含标题、价格、说明、类别列

我的代码不起作用。我不知道如何正确地做这件事。当我想添加更多列时，它不起作用。我肯定不知道是什么错了，或者我应该怎么做

以下是我的产品搜索代码：

 <?php

 // Connects to your Database 
         mysql_connect("localhost", "root", "") or die(mysql_error()) ; 
         mysql_select_db("product") or die(mysql_error()) ; 
         $search =$_POST['search'];
    $data = mysql_query("SELECT * FROM manage WHERE title or category and price= '$search' ") or die(mysql_error()); 

    //Puts it into an array 
     while($info = mysql_fetch_array( $data )) {
     //Outputs the image and other data 
     echo "<img src=http://localhost/hasem/exresze/images/".$info['photo'] ."> <br>"; Echo "<b>Title:</b> ".$info['title'] . "<br> "; Echo "<b>Description:</b> ".$info['description'] . " <br>"; Echo "<b>Category:</b> ".$info['category'] . " <hr>"; }

     ?> 

    <form action="search_product.php" method="POST">
    <input type="text" name="search">
    <input type="submit" value="Search" />
    </form>
     ?> 

---

我想你需要这样的东西。这将搜索给定的标题、类别或价格

您基本上需要这样的搜索查询

SELECT 
title, price, description, category, photo 
FROM `manage` 
WHERE 
title LIKE '%$title%' OR 
price LIKE '%$price%' OR  
category LIKE '%$category%' 

您可以对这段代码进行更多优化。这取决于你做过滤

<?php 

 //This is the directory where images will be saved 


 //This gets all the other information from the form 
 $title=$_POST['title']; 
 $price=$_POST['price']; 

 $category=$_POST['category']; 


 // Connects to your Database 
 mysql_connect("localhost", "root", "") or die(mysql_error()) ; 
 mysql_select_db("product") or die(mysql_error()) ; 

 //Writes the information to the database 


mysql_query("SELECT title, price, description, category, photo FROM `manage` WHERE title LIKE '%$title%' OR price LIKE '%$price%' OR  category LIKE '%$category%' ") ; 
//Handle the result
 ?> 

<div id="contact">
    <h1>Add New Product.</h1>
    <form action="admin.php" method="POST">
        <fieldset>
            <label for="title">Product Title<span>*</span></label>
            <input type="text" name="title" id="name" placeholder="Enter your product title" /> 
            <label for="price">Product Price $<span>*</span></label>
            <input type="text" name="price" id="name" placeholder="Enter your product price" />         
            <label for="category">Product Category <span>*</span></label>
            <select name="category" id = "myList">
               <option value = "Cloth">Cloths</option>
               <option value = "Honda">Honda</option>
               <option value = "Book">Book</option>
               <option value = "Computer">Computer</option>
             </select>
            <input type="submit" value="Search" />
        </fieldset>
    </form>
</div>

---

据我所知，您需要这样的查询：（我还在搜索字符串中添加了描述，这是一种常见做法）

mysql\u query（'SELECT*FROM`manage`WHERE`title`像“%$search\u string%”或`description`像“%$search\u string%”或（`price`>$min\u price和`price`搜索选项有哪些代码？您需要先尝试编码，然后寻求代码方面的帮助，而不仅仅是寻求代码。要给您一个起点：从表单获取用户输入，请在数据库中选择他们输入的内容与数据库中的内容匹配的位置。仔细验证和清理他们的输入。
<?php 

 //This is the directory where images will be saved 


 //This gets all the other information from the form 
 $title=$_POST['title']; 
 $price=$_POST['price']; 

 $category=$_POST['category']; 


 // Connects to your Database 
 mysql_connect("localhost", "root", "") or die(mysql_error()) ; 
 mysql_select_db("product") or die(mysql_error()) ; 

 //Writes the information to the database 


mysql_query("SELECT title, price, description, category, photo FROM `manage` WHERE title LIKE '%$title%' OR price LIKE '%$price%' OR  category LIKE '%$category%' ") ; 
//Handle the result
 ?> 

<div id="contact">
    <h1>Add New Product.</h1>
    <form action="admin.php" method="POST">
        <fieldset>
            <label for="title">Product Title<span>*</span></label>
            <input type="text" name="title" id="name" placeholder="Enter your product title" /> 
            <label for="price">Product Price $<span>*</span></label>
            <input type="text" name="price" id="name" placeholder="Enter your product price" />         
            <label for="category">Product Category <span>*</span></label>
            <select name="category" id = "myList">
               <option value = "Cloth">Cloths</option>
               <option value = "Honda">Honda</option>
               <option value = "Book">Book</option>
               <option value = "Computer">Computer</option>
             </select>
            <input type="submit" value="Search" />
        </fieldset>
    </form>
</div>

mysql_query('SELECT * FROM `manage` WHERE `title` LIKE "%$search_string%" OR `description` LIKE "%$search_string" OR (`price`>$min_price AND `price`<$max_price') OR `category`=$category);