[英]Update database using MySQL and PHP
單擊“注冊”按鈕注冊新用戶時,沒有顯示任何錯誤,但數據未插入數據庫中。
<?php
session_start();
if(isset($_POST['name'])&&isset($_POST['password'])){
$name=$_POST['name'];
$password=$_POST['password'];
$link=mysqli_connect("localhost","root","");
$select=mysqli_select_db($link,'first_db');
$name=mysqli_real_escape_string($link,$name);
$password=mysqli_real_escape_string($link,$password);
$query="SELECT * FROM users WHERE name='$name'";
$run=mysqli_query($link,$query);
$count = mysqli_num_rows($run);
if ($count>0) {
echo 'Sorry! This Username already exists!';
} else {
$name = $_POST['name'];
$password=$_POST['password'];
$sql = "INSERT INTO users (name, password)
VALUES
('$_POST[name]','$_POST[password]')";
}
}
else{
echo"Cannot be blank";
}
?>
檢查您剛剛創建的其他部分查詢,需要執行它
if ($count>0)
{
echo 'Sorry! This Username already exists!';
}
else
{
$name = $_POST['name'];
$password=$_POST['password'];
$sql = "INSERT INTO users (name, password)VALUES('$name','$password')";
$run=mysqli_query($link,$sql);// add this statement then your record inserted
}
您忘記執行插入查詢,如下所示:
mysqli_query($link,$sql);
但是您必須使用Prepared Insert Query使其更安全:
// prepare and bind User Query
$queryUsers = $conn->prepare("INSERT INTO
users(name,password) VALUES (?, ?)");
$queryUsers->bind_param("ss",$name,$password);
$name = $_POST[name];
$password = $_POST[password];
// execute Users Query
$queryUsers->execute();
// Close Connections
$queryUsers->close();
只需執行查詢字符串,就像檢查用戶是否已經存在一樣。
$sql = "INSERT INTO users (name, password)
VALUES
('$_POST[name]','$_POST[password]')";
$run=mysqli_query($link,$sql); // Executing the query here.
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