PHP MySQL 读取数据

从 MySQL 数据库读取数据
SELECT 语句用于从数据表中读取数据:
SELECT column_name(s) FROM table_name

以下实例中我们从表 MyGuests 读取了 id, firstname 和 lastname 列的数据并显示在页面上：
实例 (MySQLi - 面向对象)
<?php
$servername = "localhost";
$username = "username";
$password =
"password";
$dbname =
"myDB";
// 创建连接
$conn = new mysqli($servername,
$username, $password, $dbname);
// 检测连接
if ($conn->connect_error)
{
    die("连接失败: " . $conn->connect_error);
}
$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result
= $conn->query($sql);
if ($result->num_rows > 0) {
// 输出每行数据
    while($row = $result->fetch_assoc())
{
        echo "<br> id: ".
$row["id"]. " - Name: ". $row["firstname"]. " " . $row["lastname"];
}
} else {
    echo "0 个结果";
}
$conn->close();
?>