[英]WHERE CLAUSE is not filtering results
我在我的模型中有這個工作功能,我試圖根據學生的學科成績來獲得學生在班級中的位置。
這是有效的,但 where 子句不會過濾結果以根據主題對它們進行分類。
模型:
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id)
{
$sql = "SELECT `get_tot_score` FROM `exam_group_exam_results`
WHERE `exam_group_class_batch_exam_subject_id`= `exam_group_class_batch_exam_subject_id` ORDER BY `get_tot_score` DESC";
$query = $this->db->query($sql);
return $query->result();
}
控制器:
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id)
{
$data = $this->examresult_model->GetSubjectPosScores($exam_group_class_batch_exam_subject_id);
return $data;
}
看法:
<?php
$scores2 = $CI->GetSubjectPosScores($exam_group_class_batch_exam_subject_id); //echo $value->pos;
$scores = array_column($scores2, 'get_tot_score');
$pos = array_search($exam_result_value->get_tot_score, $scores);
$number = $pos + 1;
echo $CI->ordinal($number);?>
這就是我通過這個查詢得到的:
student_id | subject_id | get_tot_score | Position
---------------------------------------------------
11 | 1 | 76 | 3rd
12 | 1 | 90 | 1st
28 | 6 | 89 | 2nd
30 | 6 | 70 | 4th
我想要的是這個:
student_id | subject_id | get_tot_score | Position
---------------------------------------------------
11 | 1 | 76 | 2nd
12 | 1 | 90 | 1st
28 | 6 | 89 | 1st
30 | 6 | 70 | 2nd
問題出在您的查詢中
SELECT `get_tot_score` FROM `exam_group_exam_results`
WHERE `exam_group_class_batch_exam_subject_id`= `exam_group_class_batch_exam_subject_id` ORDER BY `get_tot_score` DESC
基本上您正在檢查exam_group_class_batch_exam_subject_id
exam_group_class_batch_exam_subject_id
的值
這總是正確的
您必須使用某種語句通過您的值$exam_group_class_batch_exam_subject_id
更改它(我不知道您使用的是什么庫)
編輯我看一下 codignirer 文檔
試試這個
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id)
{
$sql = "SELECT `get_tot_score` FROM `exam_group_exam_results`
WHERE `exam_group_class_batch_exam_subject_id`= ? ORDER BY `get_tot_score` DESC";
$query = $this->db->query($sql, [$exam_group_class_batch_exam_subject_id]);
return $query->result();
}
您在 where 條件中指定了字符串值,而不是在 getSubjectPosScores 函數中作為參數傳遞的變量的值
在查詢中使用 字符串插值
代替
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id) { $sql = "SELECT
FROM
,其中WHERE
=
exam_group_class_batch_exam_subject_idORDER BY
get_tot_scoreDESC"; $query = $this->db->query($sql); return $query->result(); }
DESC"; $query = $this->db->query($sql); return $query->result(); }
有了這個
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id) { $sql = "SELECT get_tot_score FROM exam_group_exam_results WHERE exam_group_class_batch_exam_subject_id= $exam_group_class_batch_exam_subject_id ORDER BY get_tot_score DESC"; $query = $this->db->query($sql); return $query->result(); }
或者
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id) { $sql = "SELECT
FROM
,其中WHERE
= '".$exam_group_class_batch_exam_subject_id."' ORDER BY
get_tot_scoreDESC"; $query = $this->db->query($sql); return $query->result(); }
DESC"; $query = $this->db->query($sql); return $query->result(); }
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