mysqli 获取结果集

$mysqli = new mysqli("数据库服务器地址", "用户名", "密码", "数据库名");
if ($mysqli->connect_error) {
    die("连接失败：" . $mysqli->connect_error);
}

$sql = "SELECT * FROM 表名";
if ($result = $mysqli->query($sql)) {
    // 处理结果集
} else {
    echo "查询失败：" . $mysqli->error;
}

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        // 处理每一行数据
    }
} else {
    echo "没有结果";
}

<?php
$mysqli = new mysqli("localhost", "root", "password", "testdb");

if ($mysqli->connect_error) {
    die("连接失败：" . $mysqli->connect_error);
}

$sql = "SELECT * FROM users";
$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "没有结果";
}

$mysqli->close();
?>