Question

我有简单的HTML表单，有两个按钮（搜索和更新）。下面的代码将通过＆＃34; Search＆＃34;从MySQL检索值。按钮，然后检索到的值＆＃34;年龄＆＃34;将通过按钮＆＃34;更新＆＃34;。

插入数据库

HTML表单包含字段：

Privateno（搜索键）
用户
年龄

所以，我真正需要的是帮助......

如何以HTML格式管理，只有Search Key（privateno）字段可编辑，其他所有字段为＃34;只读＆＃34;直到和除非如果＆＃34; privateno＆＃34;确实存在于数据库中（在这种情况下，字段值将从数据库中自动插入）？

<?php

// php code to search data in mysql database and set it in input text

if(isset($_POST['search']))
{
    // id to search
    $id = $_POST['id'];

    // connect to mysql
    $connect = mysqli_connect("localhost", "root", "","test");

    // mysql search query
    $query = "SELECT `user`, `age`, `privateno` FROM `test` WHERE `privateno` = $id LIMIT 1";

    $result = mysqli_query($connect, $query);

    // if id exist 
    // show data in inputs
    if(mysqli_num_rows($result) > 0)
    {
        while ($row = mysqli_fetch_array($result))
        {
            $user = $row['user'];
            $age = $row['age'];
            $privateno = $row['privateno'];
        }  
    }

    // if the id not exist
    // show a message and clear inputs
    else
    {
        echo "User doesn't exist";
        $user = "";
        $age = "";
        $privateno = "";
    }

    mysqli_free_result($result);
    mysqli_close($connect);
}

// in the first time inputs are empty
else
{
    $user = "";
    $age = "";
    $privateno = "";
}

?>

<?php
if(isset($_POST['update']))
{

    $age = $_POST['lname'];

    $servername = "localhost";
    $username = "root";
    $password = "";
    $dbname = "test";

    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    } 

    $sql = "INSERT INTO test (text)
            VALUES ('$age')";

    if ($conn->query($sql) === TRUE) {
        echo "New record created successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }

    $conn->close();
}
?>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <form action="index.php" method="post">
            PrivateNo:<input type="text" name="id" value="<?php echo $privateno;?>"><br><br>
            First Name:<input type="text" name="fname" value="<?php echo $user;?>"><br>
            <br>
            Age:<input type="text" name="lname" value="<?php echo $age;?>"><br><br>
            <input type="submit" value="search" name="search" />
            <input type="submit" value="update" name="update" />
        </form>
    </body>
</html>

Answer 1

First Name:<input type="text" name="fname" value="<?php echo $user;?>"readonly><br>

这很简单，我的不好，我在发布这里后几分钟就得到了一个想法。

我认为如果我将字段置于“只读”模式，则不会将DB值检索到特定的“只读”字段。

如果用户存在于db中 - 显示所有表单域，如果不存在 - 将它们显示为只读

1 个答案: