mysqli获取返回值

$host = 'localhost';
$user = 'your_username';
$password = 'your_password';
$dbname = 'your_database';

$conn = new mysqli($host, $user, $password, $dbname);

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

$sql = "SELECT * FROM your_table";
$result = $conn->query($sql);

if ($result === false) {
    die('查询失败: ' . $conn->error);
}

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

<?php
$host = 'localhost';
$user = 'your_username';
$password = 'your_password';
$dbname = 'your_database';

// 创建连接
$conn = new mysqli($host, $user, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die('连接失败: ' . $conn->connect_error);
}

// 执行查询
$sql = "SELECT * FROM your_table";
$result = $conn->query($sql);

// 检查查询结果
if ($result === false) {
    die('查询失败: ' . $conn->error);
}

// 获取并处理结果
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭连接
$conn->close();
?>