We need to submit our opinions to the database and save them, and then submit them to the page in real time

Now we create a database named 'comments'

The code is as follows

<?php
//建立'comments'數(shù)據(jù)庫
header("Content-type:text/html;charset=utf-8");    //設(shè)置編碼
$servername = "localhost";
$username = "root";
$password = "root";
// 創(chuàng)建連接
$conn = mysqli_connect($servername, $username, $password);
mysqli_set_charset($conn,'utf8'); //設(shè)定字符集
// 檢測(cè)連接
if (!$conn) {
    die("連接失敗: " . mysqli_connect_error());
}
// 創(chuàng)建數(shù)據(jù)庫
$sql = "CREATE DATABASE comments";
if (mysqli_query($conn, $sql)) {
    echo "數(shù)據(jù)庫創(chuàng)建成功";
} else {
    echo "數(shù)據(jù)庫創(chuàng)建失敗: " . mysqli_error($conn);
}
mysqli_close($conn);
?>

We are creating a data table named 'comments'

<?php
header("Content-type:text/html;charset=utf-8");    //設(shè)置編碼
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "comments";
// 創(chuàng)建連接
$conn = mysqli_connect($servername, $username, $password, $dbname);
mysqli_set_charset($conn,'utf8'); //設(shè)定字符集
// 檢測(cè)連接
if (!$conn) {
    die("連接失敗: " . mysqli_connect_error());
}
// 使用 sql 創(chuàng)建數(shù)據(jù)表
$sql = "CREATE TABLE `comments` (
  `id` int(11) NOT NULL auto_increment,
  `user` varchar(30) NOT NULL,
  `comment` varchar(200) NOT NULL,
  `addtime` datetime NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM; " ;
if (mysqli_query($conn, $sql)) {
    echo "數(shù)據(jù)表 comments 創(chuàng)建成功";
} else {
    echo "創(chuàng)建數(shù)據(jù)表錯(cuò)誤: " . mysqli_error($conn);
}
mysqli_close($conn);
?>