查询生成器 Codeigniter 3答案

【问题标题】：Query Builder Codeigniter 3查询生成器 Codeigniter 3
【发布时间】：2016-07-05 00:54:33
【问题描述】：

我这个mysql查询

SELECT project.title project_title, category.category, project_details.description description, SUM(project_details.quantity) total_quantity, project_details.unit, SUM(project_details.price) total_price, SUM(project_details.jan) total_jan, SUM(project_details.feb) total_feb, SUM(project_details.mar) total_mar, SUM(project_details.apr) total_apr, SUM(project_details.may) total_may, SUM(project_details.jun) total_jun, SUM(project_details.jul) total_jul, SUM(project_details.aug) total_aug, SUM(project_details.sep) total_sep, SUM(project_details.oct) total_oct, SUM(project_details.nov) total_nov, SUM(project_details.dec) total_dec
FROM project_details
JOIN project ON project_details.project_id = project.id
JOIN category ON project_details.category_id = category.id
JOIN user ON project.user_id = user.id
RIGHT JOIN office ON user.office_id = office.id
WHERE EXISTS 
    (
        SELECT t1.id id1, t2.id id2, t3.id id3, t4.id id4, t5.id id5
        FROM user t1
        LEFT JOIN user t2 ON t2.reports_to = t1.id
        LEFT JOIN user t3 ON t3.reports_to = t2.id
        LEFT JOIN user t4 ON t4.reports_to = t3.id
        LEFT JOIN user t5 ON t5.reports_to = t4.id
        WHERE t1.id = 81
    )
    AND project.approval_status = 22 AND project.reason_for_rejection IS NULL
GROUP BY project.id, project_details.description
ORDER BY project_details.category_id

但是我在 Codeigniter 3.0 中找不到任何可以找到 WHERE EXISTS 的文档。我已经检查过这个https://www.codeigniter.com/userguide3/database/query_builder.html 但没有。

这是我现在的代码

$this->db->select('project.title project_title, category.category, project_details.description description, SUM(project_details.quantity) total_quantity, project_details.unit, SUM(project_details.price) total_price, SUM(project_details.jan) total_jan, SUM(project_details.feb) total_feb, SUM(project_details.mar) total_mar, SUM(project_details.apr) total_apr, SUM(project_details.may) total_may, SUM(project_details.jun) total_jun, SUM(project_details.jul) total_jul, SUM(project_details.aug) total_aug, SUM(project_details.sep) total_sep, SUM(project_details.oct) total_oct, SUM(project_details.nov) total_nov, SUM(project_details.dec) total_dec');
$this->db->from('project_details');
$this->db->join('project', 'project_details.project_id = project.id');
$this->db->join('category', 'project_details.category_id = category.id');
$this->db->join('user', 'project.user_id = user.id');
$this->db->join('office', 'user.office_id = office.id', 'right');
// THIS IS WHERE I WANT TO PUT THE WHERE EXISTS
$this->db->where('project.approval_status', $user_id);
$this->db->where('project.reason_for_rejection IS NULL', NULL, TRUE);
$this->db->group_by('project.id');
$this->db->group_by('project_details.description');
$this->db->order_by('project_details.category_id');
$query = $this->db->get();
return $query->result();

有人可以帮助我如何在 codeigniter 中实现这一点吗？高级感谢。

【问题讨论】：

你试过$query = $this->db->query('your large query');吗？
$this->db->query('query') 不是很容易被 SQL 注入吗？
你应该阅读stackoverflow.com/questions/1615792/…
感谢您的回答。我会用这个。

标签： php mysql codeigniter

【解决方案1】：

当您有一个非常大的查询，或者为您的目的而制作的查询构建器中没有内置函数时，您可以随时使用：

$query = $this->db->query('your large query');

您还应该注意注射，因此您还应该阅读此post

这很好地解释了如何使用$this->db->query 方法对抗 sql 注入。

希望对你有帮助

【讨论】：