不能插入數據到MySQL與PHP

Question

好，所以我可以連接和查看數據庫與我的PHP代碼，但我不能插入數據到它。有我用phpmyadmin測試的查詢，它能夠插入新數據到我的表

INSERT INTO `members` (`id` , `username` , `email`) 
VALUES (123456789, 'russi', 'baka@dog.com') 

然後我試圖把它變成我的實際php文件

<?php 
$servername = "localhost"; 
$username = "root"; 
$password = "blablabla"; 
$dbname = "test_database"; 

// Create connection 
$conn = new mysqli($servername, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 
$sql = "INSERT INTO 'members' ('id', 'username', 'email') 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
$sql = "SELECT id, username, email FROM members"; 
$result = $conn->query($sql); 

if ($result->num_rows > 0) { 
    // output data of each row 
    while($row = $result->fetch_assoc()) { 
     echo "id: " . $row["id"]. " - username: " . $row["username"]. " -email:" . $row["email"]. "<br>"; 
    } 
} else { 
    echo "0 results"; 
} 
$conn->close(); 
?> 

所以選擇功能的作品，但插入沒有。

Answer 1

要覆蓋你的$sql可變W/O執行它。再說，你不應該使用的列單引號，但反引號（見When to use single quotes, double quotes, and backticks in MySQL）

變化

$sql = "INSERT INTO 'members' ('id', 'username', 'email') 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
$sql = "SELECT id, username, email FROM members"; 
$result = $conn->query($sql); 

到

$sql = "INSERT INTO `members` (`id`, `username`, `email`) 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
$result = $conn->query($sql); 
$sql = "SELECT id, username, email FROM members"; 
$result = $conn->query($sql); 

Answer 2

刪除單引號括起來的列名和表名：

$sql = "INSERT INTO members (id, username, email) 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 

單引號僅用於焦炭領域。

此外，您永遠不會執行插入語句，因爲您覆蓋它。

Answer 3

更改您的插入到：

$sql = "INSERT INTO members (id, username, email) 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 

，並致電查詢：

$sql = "INSERT INTO members (id, username, email) 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
//Here, you never execute your query 
$result = $conn->query($sql); 

$sql = "SELECT id, username, email FROM members"; 
$result = $conn->query($sql); 

Answer 4

當然它沒有工作！

你永遠不執行你的INSERT ...

<?php 
... 
$sql = "INSERT INTO 'members' ('id', 'username', 'email') 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
$conn->exec($sql); 
$sql = "SELECT id, username, email FROM members"; 
$result = $conn->query($sql); 
... 

:)

Answer 5

$sql = "INSERT INTO 'members' ('id', 'username', 'email') 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 
$sql = "SELECT id, username, email FROM members"; 
//missing the grave accent 
$sql = "INSERT INTO `members` (id, username, email) 
VALUES (2339978, 'vladtheimpalor', 'vladtheimaplor@bloody.com')"; 

$sql = "SELECT `id`, `username`, `email` FROM `members`"; 

/* This is the corrrected code */