php按日期从mysql获取数据

<?php
// 连接MySQL数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 获取指定日期的数据
$date = "2022-01-01";
$sql = "SELECT * FROM table_name WHERE date_column = '$date'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        // 处理查询结果
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 获取一段日期范围内的数据
$start_date = "2022-01-01";
$end_date = "2022-01-31";
$sql = "SELECT * FROM table_name WHERE date_column BETWEEN '$start_date' AND '$end_date'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        // 处理查询结果
        echo "ID: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 结果";
}

// 关闭数据库连接
$conn->close();
?>