php - 在 php、MySql 中从多个表创建报告

Question

我们有四个表，其中分别包含以下数据，

1. tbl_user [user_id, user_name, user_email, user_country]
2. tbl_questions [survey_id, survey_question, posted_on]
3. tbl_answers [answer_id, question_id, answers]
4. tbl_survey_result [user_id, question_id, answer_id, timestamp]

我们希望根据这些数据生成 Excel 报告，如下图所示，

survey_result_dd_mm_yyyy.xls

sr_no | User_id | User_name | User_Email | User_Country | Question_1 | Question_2... ( n number of questions)
1     | 123456  | John Doe  |john@doe.in | India        | His Answer | Another Ans...

那么，我们如何使用mysql、php生成这个报告呢？

Answer 1

我会通过形成像这样的基本查询来获取用户 ID 来实现它:

select u.user_id from tbl_user u

然后，假设我们在 $users 变量中获取用户 ID 数据，我将在 foreach ($users as $user) 循环中运行以下查询:

select u.user_id, u.user_name, u.user_email, u.user_country, q.survey_question, a.answers from tbl_user u
inner join tbl_survey s on u.user_id = s.user_id
inner join tbl_answers a on a.answer_id = s.answer_id
inner join tbl_questions q on q.question_id = s.question_id
where u.user_id = %user
order by u.user_id, q.survey_id'

最后，将查询解析为用户问题数组。

导出到excel的问题已经被巴巴在https://stackoverflow.com/a/10424955/3986395中回答了我将在这里分享他的答案:

header("Content-Disposition: attachment; filename=\"demo.xls\"");
header("Content-Type: application/vnd.ms-excel;");
header("Pragma: no-cache");
header("Expires: 0");
$out = fopen("php://output", 'w');
foreach ($array as $data)
{
    fputcsv($out, $data,"\t");
}
fclose($out);

最后，如果您有数百万用户，您可能不希望在 foreach 循环中运行查询，而是编写组合查询来获取所有用户数据。此查询将为您提供 user_id-answer 记录，并且您需要在 php 中添加额外的处理逻辑来将数据合并到所需的数组中

select u.user_id, u.user_name, u.user_email, u.user_country, q.survey_question, a.answers from tbl_user u
inner join tbl_survey s on u.user_id = s.user_id
inner join tbl_answers a on a.answer_id = s.answer_id
inner join tbl_questions q on q.question_id = s.question_id
where ..
order by u.user_id, q.survey_id