php - 从 php、MySql 中的多个表创建报告

Question

我们有四个表格，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]

我们想根据这些数据生成一个excel报告，如下图，

调查结果_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  |[e-mail] | India        | His Answer | Another Ans...

那么，我们如何使用 mysql、php 生成这个报告呢？

标签： phpmysql

Answer 1

我会通过形成这样的基本查询来获取用户ID来接近它：

select u.user_id from tbl_user u

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

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。

Baba 在https://stackoverflow.com/a/10424955/3986395中已经回答了导出到 excel 的问题，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，您可能不想在 foreach 循环中运行查询，而是编写一个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，您需要 php 中的其他处理逻辑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