PHP循环遍历查询以执行条件插入或更新

<?php
// 连接数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 查询需要更新或插入的数据
$sql = "SELECT * FROM your_table WHERE your_condition";
$result = $conn->query($sql);

// 循环遍历查询结果
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        // 根据条件执行插入或更新操作
        if ($row['your_condition']) {
            // 执行插入操作
            $insertSql = "INSERT INTO your_table (column1, column2) VALUES ('value1', 'value2')";
            $conn->query($insertSql);
        } else {
            // 执行更新操作
            $updateSql = "UPDATE your_table SET column1 = 'new_value' WHERE your_condition";
            $conn->query($updateSql);
        }
    }
} else {
    echo "没有符合条件的数据";
}

// 关闭数据库连接
$conn->close();
?>