Question

我正在处理收件箱系统。在前端，它使用jQuery和Ajax，因此页面不会刷新。我处理了那个部分。在后端，有3个表（现在）可以插入数据。

以下是关系结构的基本概要：

conversations:
conversation_id int(11) primary key
conversation_subject varchar(128)

conversations_members:
conversation_id int(11)
user_id int(11)
conversation_last_view int(10)
conversation_deleted int(1)

conversations_messages:
message_id int(11) primary key
conversation_id int(11)
user_id int(11)
message_date timestamp
message_text text

还有一个问题，因为sender_id始终为0，但由于它不在主题，因此必须针对另一个问题。问题出在conversations_members表中。其他所有内容都会输入到conversations和conversations_messages表中。这是PHP。问题是底部的最后一个SQL查询：

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

include('../inc/connect.php');
if (!isset($_SESSION['username'])) {
    session_start();
}
$recipient_username = "";
$sender_id = "";
$a = 0;
$b = 0;
if(isset($_POST['subject'], $_POST['msg_body']) &&     !empty($_POST['subject']) && !empty($_POST['msg_body'])) {

//get ID of sender
$sender_id_query = "SELECT id FROM `users` WHERE username = ?";
$stmt = $connection->prepare($sender_id_query);
$stmt->bind_param('s', $_SESSION['username']);
$stmt->execute();
$result = mysqli_query($connection, $sender_id_query);
if($result) {
    while($row = mysqli_fetch_assoc($result)) {
        //$row['id'] = $sender_id;           //neither of these work
        $sender_id = $connection->insert_id; //Always zero
    }
}
$stmt->close();

//get username of recipient
$recipient_name_query = "SELECT * FROM `users`";
$result = mysqli_query($connection, $recipient_name_query);
if($result) {
    while($row = mysqli_fetch_assoc($result)) {
        $row['username'] = $recipient_username;
    }
}
//define post variables
$msg_subject = $_POST['subject'];
$msg_body = $_POST['msg_body'];
$subject = $connection->real_escape_string(htmlentities($msg_subject));
$body = $connection->real_escape_string(htmlentities($msg_body));
$conversation_id = mysqli_insert_id($connection);


//GET RECIPIENT ID
$sql = "SELECT id FROM `users` WHERE username=?";
$stmt = $connection->prepare($sql);
$stmt->bind_param('s', $recipient_username);
$result = mysqli_query($connection, $sql);
if ($result) {
    while ($row = mysqli_fetch_assoc($result)) {
        $recipient_id = $row['id'];
    }
}
$stmt->close();

//INSERT SUBJECT INTO CONVERSATIONS TABLE
$stmt = $connection->prepare("INSERT INTO `conversations` (conversation_subject) VALUES(?)");
$stmt->bind_param('s', $subject);
$stmt->execute();
$stmt->close();


//INSERT THE IDs AND TIMESTAMPS INTO MESSAGES TABLE
$stmt = $connection->prepare("INSERT INTO `conversations_messages` (conversation_id, user_id, message_date, message_text)
                              VALUES(?, ?, NOW(), ?)");
$stmt->bind_param('iis', $conversation_id, $sender_id, $body);
$stmt->execute();
$stmt->close();

/*
 THE FOLLOWING DATA DOES NOT GET INSERTED.....
*/
//INSERT IDs, LAST_VIEWED, AND DELETED INTO MEMBERS TABLE
$stmt = $connection->prepare("INSERT INTO `conversations_members` (conversation_id, user_id, conversation_last_view, conversation_deleted)
                              VALUES (?, ?, ?, ?)");
$stmt->bind_param('iiii', $conversation_id, $recipient_id, $a, $b);
$stmt->execute();
$stmt->close();
}

我没有错误，而且我没有看到任何错别字。我哪里出错了？

Answer 1

感谢有关额外错误检查的建议，它让我发现了正在发生的事情。我完全删除了while循环，并给每个$ stmt变量它自己的名字，因为我在删除while循环后发现了另一个错误。由于前一个语句未被关闭，因此第一个语句之后的每个语句都返回一个FALSE值。这段代码有效。我没有错误，它根据需要将所有内容插入数据库。

$recipient_username = $_GET['username'];
$username = $_SESSION['username'];
$a = 0;
$b = 0;


//get ID of sender
$sender_id_query = "SELECT id FROM `users` WHERE username = ?";
$stmt = $connection->prepare($sender_id_query);
$stmt->bind_param('s', $username);
$stmt->execute();
$stmt->bind_result($sender_id);
$val = $stmt->fetch()[$sender_id];
$stmt->close();

//define post variables
$msg_subject = $_POST['subject'];
$msg_body = $_POST['msg_body'];
$subject = $connection->real_escape_string(htmlentities($msg_subject));
$body = $connection->real_escape_string(htmlentities($msg_body));
$conversation_id = mysqli_insert_id($connection);

//GET RECIPIENT ID
$recipient_id_query = "SELECT id FROM `users` WHERE username=?";
$stmt2 = $connection->prepare($recipient_id_query);
$stmt2->bind_param('s', $recipient_username);
$stmt2->execute();
$stmt2->bind_result($recipient_id);
$val_2 = $stmt2->fetch()[$recipient_id];
$stmt2->close();

//INSERT SUBJECT INTO CONVERSATIONS TABLE
$stmt3 = $connection->prepare("INSERT INTO `conversations` (conversation_subject) VALUES(?)");
$stmt3->bind_param('s', $subject);
$stmt3->execute();
$stmt3->close();

//INSERT THE IDs AND TIMESTAMPS INTO MESSAGES TABLE
$stmt4 = $connection->prepare("INSERT INTO `conversations_messages` (conversation_id, user_id, message_date, message_text)
                              VALUES(?, ?, NOW(), ?)");
$stmt4->bind_param('iis', $conversation_id, $sender_id, $body);
$stmt4->execute();
$stmt4->close();


//INSERT IDs, LAST_VIEWED, AND DELETED INTO MEMBERS TABLE
$stmt5 = $connection->prepare("INSERT INTO `conversations_members` (conversation_id, user_id, conversation_last_view, conversation_deleted)
                              VALUES (?, ?, ?, ?)");
$q = $stmt5->bind_param('iiii', $conversation_id, $recipient_id, $a, $b);
$stmt5->execute();
$stmt5->close();

PHP Prepared语句将数据插入除一个表之外的所有表（MySQL）

1 个答案: