Question

我已经创建了一个HTML表单，我希望让用户更新他/她的数据。所有插入和删除功能都运行良好，但更新函数返回错误说，＆＃34;错误：您的SQL语法出错;查看与您的MariaDB服务器版本对应的手册，以获得正确的语法，以便在＆＃39; WHERE regNumber =＆＃39; IT17456734＆＃39;＆＃39;在第1行。＆＃34;无论我输入的注册号是什么，它都不允许我编辑现有数据。有人可以发现错误吗？由于我是PHP的初学者，我无法继续前进。这是我的PHP代码。

<?php
require 'db_connect.php';

＆GT;

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<div align = "center">

<h4>

<?php   

    if(!empty($_POST["regNo"]) && !empty($_POST["fullname"]) && !empty($_POST["comment"]) && !empty($_POST["faculty"]) && !empty($_POST["year"]))
    {
        $regNumber = $_POST["regNo"];
        $name = $_POST["fullname"];
        $comment = $_POST["comment"];
        $year = $_POST["year"];
        $faculty = $_POST["faculty"];

        //echo "Successfully values collected from form.html";
    }   

    else
    {
        $error = "One or more fields are not filled";

        echo $error;
    }

    //insert data to the database

    if(isset($_POST["btnInsert"]))
    {   
        $insertString = "INSERT INTO library_comment VALUES('$regNumber', '$name', '$comment')";

        $connection = mysqli_connect("127.0.0.1","root","","iwt");

        if(!mysqli_query($connection, "INSERT INTO library_comment VALUES('$regNumber', '$name', '$comment')"))
        {
            die('Error: '.mysqli_error($connection));
        }

        else
        {
            echo '<br/>';
            echo '1 record added...';
        }
    }

    //update data in the database

    else if(isset($_POST["btnUpdate"]))
    {           
        $query = "UPDATE library_comment SET regNumber = '$regNumber', name = '$name', comment = '$comment' WHERE regNumber = '$regNumber'";

        $connection = mysqli_connect("127.0.0.1","root","","iwt");

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

        if (!$result) 
        {
            die('Error: '.mysqli_error($connection));
        } 

        else 
        {           
            echo '<br/>';
            echo '1 record updated...';
        }
    }

    else if(isset($_POST["delete"]))
    {
        $updateString = "DELETE FROM library_comment WHERE regNo = '$regNumber'";

        $connection = mysqli_connect("127.0.0.1","root","","iwt");

        if(!mysqli_query($connection, $updateString))
        {
            die('Error: '.mysqli_error($connection));
        }

        else
        {
            echo '<br/>';
            echo '1 record deleted...';
        }
    }
?>

<hr/>

</h4>

<div>

＆＃13;

<!DOCTYPE html>
<html>
<head>
	<style>
		.btn{
			border-radius: 5px;
		}
	</style>
</head>
	<body>
		<div align="center">
		<form name = "comments" method = "POST" action = "addComment.php">
			<table>
				<caption><b><h2>Comments on Library Service </h2></b></caption>
				<tr></tr>
				<tr>
					<td>Registration Number</td>
					<td><input type="text" name="regNo" /></td>
				</tr>
				
				<tr>
					<td>Name with initials</td>
					<td><input type="text" name="fullname" placeholder="Kamal.P"/></td>
				</tr>
				
				<tr>
					<td>Year :</td>
					<td>
					<input list="year" name="year" />
					<datalist id="year">
						<option value="Please choose">
						<option value="Year 1">
						<option value="Year 2">
						<option value="Year 3">
						<option value="Year 4">
					</datalist>
					</td>
				</tr>
				
				<tr>
					<td>Faculty :</td>
					<td>
					<input list="faculty" name="faculty" />
					<datalist id="faculty">
						<option value="Please choose">
						<option value="Faculty of Computing">
						<option value="Faculty of Business">
						<option value="Faculty of Engineering">
					</datalist>
					</td>
				</tr>
				
				<tr>
					<td>Comments on the Service :</td>
					<td><textarea name="comment" row="5" cols="30"></textarea></td>
				</tr>
				
				
				
				<tr>
					<td>
						<input class="btn" type="submit" name="btnInsert" value="Insert"/>
						<input class="btn" type="submit" name="btnUpdate" value="Update"/>
						<input class="btn" type="submit" name="delete" value="Delete"/>
					</td>

					<td>
						<input class="btn" type="button" name="btnView" value="View"/>
						<input class="btn" type="reset" name="btnReset" value="Reset"/>
					</td>
				</tr>
			</table>
		</form>
		</div>
	</body>
</html>

＆＃13;

Answer 1

我已经解决了这个问题。问题在于where子句应该更正为＆＃34; [....] WHERE regNo =＆＃39; $ regNumber＆＃39;＆＃34;

PHP表单更新过程没有按预期工作

1 个答案: