如何使用PHP編寫庫存管理系統中的銷售報表來產生功能代碼

<?php
$host = "localhost"; //数据库主机地址
$username = "root"; //数据库用户名
$password = "password"; //数据库密码
$dbname = "inventory"; //数据库名

//连接到数据库
$mysqli = new mysqli($host, $username, $password, $dbname);

//检查连接是否成功
if ($mysqli->connect_error) {
    die("连接数据库失败: " . $mysqli->connect_error);
}
?>

<?php
//查询某个时间段内的销售记录
$start_date = "2022-01-01";
$end_date = "2022-06-30";

$sql = "SELECT * FROM sales WHERE sale_date BETWEEN '{$start_date}' AND '{$end_date}'";

$result = $mysqli->query($sql);

if ($result->num_rows > 0) {
    //处理查询结果
    while ($row = $result->fetch_assoc()) {
        //对每一行数据进行报表生成的逻辑操作
        //可以将数据存储到一个数组或者其他数据结构中，用于后续的报表生成操作
    }
} else {
    echo "没有找到符合条件的销售记录";
}

$result->free(); //释放查询结果集内存
?>

<?php
require_once 'PHPExcel/PHPExcel.php';

$excel = new PHPExcel();

//设置报表属性
$excel->getProperties()
    ->setCreator("Your Name")
    ->setTitle("Sales Report")
    ->setDescription("Sales report generated by PHPExcel");

//创建一个工作表
$sheet = $excel->getActiveSheet();
$sheet->setTitle("Sales");

$row = 1; //起始行

//输出查询结果
$sql = "SELECT * FROM sales WHERE sale_date BETWEEN '{$start_date}' AND '{$end_date}'";
$result = $mysqli->query($sql);

while ($row_data = $result->fetch_assoc()) {
    $col = 1; //起始列
    foreach ($row_data as $value) {
        $sheet->setCellValueByColumnAndRow($col, $row, $value);
        $col++;
    }
    $row++;
}

$result->free();

//保存为Excel文件
$writer = PHPExcel_IOFactory::createWriter($excel, 'Excel2007');
$writer->save("sales_report.xlsx");
?>