如何从mysql php中的两个表中搜索答案

【问题标题】：How to search from two table in mysql php如何从mysql php中的两个表中搜索
【发布时间】：2020-12-25 17:43:40
【问题描述】：

我的 PHP 文件中有一个搜索框。但它只从一个表名“国家”中搜索但我有另一个表“大陆”我希望我的搜索框从两个表“国家”和“大陆”中获取结果。目前，它看起来像这样[我的搜索框][1]

<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
$link = mysqli_connect("localhost", "root", "", "test");
 
// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
 
if(isset($_REQUEST["term"])){
    // Prepare a select statement
    $sql = "SELECT * FROM countries WHERE name LIKE ?";
          
         
    
    if($stmt = mysqli_prepare($link, $sql)){
        // Bind variables to the prepared statement as parameters
        mysqli_stmt_bind_param($stmt, "s", $param_term);
        
        // Set parameters
        $param_term = $_REQUEST["term"] . '%';
        
        // Attempt to execute the prepared statement
        if(mysqli_stmt_execute($stmt)){
            $result = mysqli_stmt_get_result($stmt);
            
            // Check number of rows in the result set
            if(mysqli_num_rows($result) > 0){
                // Fetch result rows as an associative array
                while($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
                   
                    echo '<img src="'.$row['image'].' "width="85px" height="85px" >';
                    echo '<p><a href="deteles.php?ID='. $row['id'] .'" target="_blank">'. $row['name']. '</a></p>';
                   
                    
                }
            } else{
                echo "<p>No matches found</p>";
            }
        } else{
            echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
        }
    }
     
    // Close statement
    mysqli_stmt_close($stmt);
}
 
// close connection
mysqli_close($link);
?>

这是我的桌子[table1][2] [表3][3]

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>PHP Live MySQL Database Search</title>
<style type="text/css">
    body{
        font-family: Arail, sans-serif;
    }
    /* Formatting search box */
    .search-box{
        width: 100%;
        position: relative;
        display: inline-block;
        font-size: 14px;
    }
    .search-box input[type="text"]{
        height: 32px;
        padding: 5px 10px;
        border: 1px solid #CCCCCC;
        font-size: 14px;
    }
    .result{
        position: absolute;        
        z-index: 999;
        top: 100%;
        left: 0;
        overflow: auto;
    }
    .search-box input[type="text"], .result{
        width: 100%;
        box-sizing: border-box;
    }
    /* Formatting result items */
    .result p{
        margin: 0;
        padding: 7px 10px;
        border: 1px solid #CCCCCC;
        margin-top: -60px;
        cursor: pointer;
        margin-left: 94px;
    }
    .result p:hover{
        background: #f2f2f2;
    }
    .result img{
        float: left;
        float: unset;
        margin-top: 30px;
    }
    .result p a{
        text-decoration: none;
    }
</style>
<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    $('.search-box input[type="text"]').on("keyup input", function(){
        /* Get input value on change */
        var inputVal = $(this).val();
        var resultDropdown = $(this).siblings(".result");
        if(inputVal.length){
            $.get("backend-search.php", {term: inputVal}).done(function(data){
                // Display the returned data in browser
                resultDropdown.html(data);
            });
        } else{
            resultDropdown.empty();
        }
    });
    
    // Set search input value on click of result item
    $(document).on("click", ".result p", function(){
        $(this).parents(".search-box").find('input[type="text"]').val($(this).text());
        $(this).parent(".result").empty();
    });
});
</script>
</head>
<body>
    <div class="search-box">
        <input type="text" autocomplete="off" placeholder="Search country..." />
        <div class="result"></div>
    </div>
</body>
</html>

这是我的两个 PHP 文件。

【问题讨论】：

通过JOIN合并数据库表
这能回答你的问题吗？ Searching Multiple Tables (SQL)
见meta.stackoverflow.com/questions/333952/…

标签： javascript php html mysql

【解决方案1】：

您可以使用 UNION。唯一的条件是列数应该在两个查询中匹配。这是一个例子

SELECT id, name, 'country' FROM countries WHERE name LIKE '%America%' 
UNION
SELECT id, name, 'continent' FROM continents WHERE name LIKE '%America%';

【讨论】：

在名为“国家”的列中显示“大陆”似乎有点不正常