我正在使用 UPDATE 查询来更改我的数据库。我对一行中特定单元格所做的更新被插入到数据库中。但是发生的是该单元格之后的任何空白日期空间被输入为 0000-00-00。

例如，当我更新最终审核日期时，这是我应该得到的

Before Update
Date Received   Final Review Date       Date Delivered         Date Accepted  
2015-03-03  

After Update
Date Received   Final Review Date       Date Delivered         Date Accepted  
2015-03-03        2015-08-05

Instead I get this:

Date Received   Final Review Date       Date Delivered         Date Accepted  
2015-03-03        2015-08-05              0000-00-00              0000-00-00

我已经尝试解决这个问题，但我对 mysqli/php 还很陌生，所以我知道我可能遗漏了一些简单的东西。任何解决此问题的帮助将不胜感激。

<?php
$servername = "localhost";
$username = "xxx";
$password = "xxx";
$dbname = "oldga740_SeniorProject";

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

if (isset($_POST['update'])){
$UpdateQuery = "UPDATE Projects SET Project='$_POST[project]', Client='$_POST[client]', LastName='$_POST[lastname]', DateReceived='$_POST[datereceived]', FinalReviewDate='$_POST[finalreviewdate]', DateDelivered='$_POST[datedelivered]', DateAccepted='$_POST[dateaccepted]' WHERE Project='$_POST[hidden]'";
mysqli_query($conn, $UpdateQuery);
};

$sql = "SELECT * FROM Projects";
$result = $conn->query($sql);



echo "<table>

<tr>
<th>Project</th>
<th>Client</th>
<th>Last Name</th>
<th>Date Received</th>
<th>Final Review Date</th>
<th>Date Delivered</th>
<th>Date Accepted</th>
</tr>";

while($record = mysqli_fetch_array($result))
{
if ($result->num_rows > 0){

echo "<form action='mynewform.php' method='post'>";
echo "<tr>"; 
echo "<td>" . "<input type='text' name='project' value='" . $record['Project'] . "' /></td>";
echo "<td>" . "<input type='text' name='client' value='" . $record['Client'] . "'/></td>";
echo "<td>" . "<input type='text' name='lastname' value='" . $record['LastName'] . "' /></td>";
echo "<td>" . "<input type='text' name='datereceived' value='" . $record['DateReceived'] . "' /></td>";
echo "<td>" . "<input type='text' name='finalreviewdate' value='" . $record['FinalReviewDate'] . "' /></td>";
echo "<td>" . "<input type='text' name='datedelivered' value='" . $record['DateDelivered'] . "' /></td>";
echo "<td>" . "<input type='text' name='dateaccepted' value='" . $record['DateAccepted'] . "' /></td>";
echo "<td>" . "<input type='hidden' name='hidden' value='" . $record['Project'] . "' /></td>";
echo "<td>" . "<input type='submit' name='update' value='update' /></td>";
echo "<td>" . "<input type='submit' name='delete' value='delete' /></td>";
echo "</tr>";
echo "</form>";
}
}
echo "</table>";

?>



<?php
    $conn->close();
?>



</body>

</html>

最佳答案

问题:

The updates I make to a particular cell in a row get inserted into the database. What's happening though is any blank date spaces that come after that cell get entered as 0000-00-00.

解决方案:

根据您的评论，

The database already has those columns set to default as NULL. The only one that doesn't is the DateReceived column.

我假设 Project、Client、LastName 和 DateReceived 已经设置。因此解决方案是在用户未指定要更新的任何数据时插入 NULL 值，如下所示:

// your code

if (isset($_POST['update'])){
    $project = trim($_POST['project']);
    $client = trim($_POST['client']);
    $lastname = trim($_POST['lastname']);
    $datereceived = $_POST['datereceived'];

    $UpdateQuery = "UPDATE Projects SET Project='{$project}', Client='{$client}', LastName='{$lastname}', DateReceived='{$datereceived}'";

    if(empty($_POST['finalreviewdate'])){
        $UpdateQuery .= ", FinalReviewDate = NULL";
    }else{
        $UpdateQuery .= ", FinalReviewDate = '{$_POST['finalreviewdate']}'";
    }

    if(empty($_POST['datedelivered'])){
        $UpdateQuery .= ", DateDelivered = NULL";
    }else{
        $UpdateQuery .= ", DateDelivered = '{$_POST['datedelivered']}'";
    }

    if(empty($_POST['dateaccepted'])){
        $UpdateQuery .= ", DateAccepted = NULL";
    }else{
        $UpdateQuery .= ", DateAccepted = '{$_POST['dateaccepted']}'";
    }

    $UpdateQuery .= " WHERE Project='{$_POST['hidden']}'";

    mysqli_query($conn, $UpdateQuery);
};

// your code

完整代码如下:(测试)

<?php
$servername = "localhost";
$username = "xxx";
$password = "xxx";
$dbname = "oldga740_SeniorProject";

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

if (isset($_POST['update'])){
    $project = trim($_POST['project']);
    $client = trim($_POST['client']);
    $lastname = trim($_POST['lastname']);
    $datereceived = $_POST['datereceived'];

    $UpdateQuery = "UPDATE Projects SET Project='{$project}', Client='{$client}', LastName='{$lastname}', DateReceived='{$datereceived}'";

    if(empty($_POST['finalreviewdate'])){
        $UpdateQuery .= ", FinalReviewDate = NULL";
    }else{
        $UpdateQuery .= ", FinalReviewDate = '{$_POST['finalreviewdate']}'";
    }

    if(empty($_POST['datedelivered'])){
        $UpdateQuery .= ", DateDelivered = NULL";
    }else{
        $UpdateQuery .= ", DateDelivered = '{$_POST['datedelivered']}'";
    }

    if(empty($_POST['dateaccepted'])){
        $UpdateQuery .= ", DateAccepted = NULL";
    }else{
        $UpdateQuery .= ", DateAccepted = '{$_POST['dateaccepted']}'";
    }

    $UpdateQuery .= " WHERE Project='{$_POST['hidden']}'";

    mysqli_query($conn, $UpdateQuery);
};

$sql = "SELECT * FROM Projects";
$result = $conn->query($sql);



echo "<table>

<tr>
<th>Project</th>
<th>Client</th>
<th>Last Name</th>
<th>Date Received</th>
<th>Final Review Date</th>
<th>Date Delivered</th>
<th>Date Accepted</th>
</tr>";

while($record = mysqli_fetch_array($result))
{
if ($result->num_rows > 0){

echo "<form action='process.php' method='post'>";
echo "<tr>"; 
echo "<td>" . "<input type='text' name='project' value='" . $record['Project'] . "' /></td>";
echo "<td>" . "<input type='text' name='client' value='" . $record['Client'] . "'/></td>";
echo "<td>" . "<input type='text' name='lastname' value='" . $record['LastName'] . "' /></td>";
echo "<td>" . "<input type='text' name='datereceived' value='" . $record['DateReceived'] . "' /></td>";
echo "<td>" . "<input type='text' name='finalreviewdate' value='" . $record['FinalReviewDate'] . "' /></td>";
echo "<td>" . "<input type='text' name='datedelivered' value='" . $record['DateDelivered'] . "' /></td>";
echo "<td>" . "<input type='text' name='dateaccepted' value='" . $record['DateAccepted'] . "' /></td>";
echo "<td>" . "<input type='hidden' name='hidden' value='" . $record['Project'] . "' /></td>";
echo "<td>" . "<input type='submit' name='update' value='update' /></td>";
echo "<td>" . "<input type='submit' name='delete' value='delete' /></td>";
echo "</tr>";
echo "</form>";
}
}
echo "</table>";

?>



<?php
    $conn->close();
?>

</body>

</html>

关于php - sql UPDATES 更新更改列之后的行中的每一列，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34048691/