我在我的模型中有一个工作函数，我试图根据学生的学科成绩来得到他们在班级中的位置。
这是有效的，但是where子句不能过滤结果以根据主题对它们进行分类。
型号：
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;
}查看者：
<?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);?>这是我用这个查询得到的结果：
student_id | subject_id | get_tot_score | Position
---------------------------------------------------
11 | 1 | 76 | 3rd
12 | 1 | 90 | 1st
28 | 6 | 89 | 2nd
30 | 6 | 70 | 4th我想要是：
student_id | subject_id | get_tot_score | Position
---------------------------------------------------
11 | 1 | 76 | 2nd
12 | 1 | 90 | 1st
28 | 6 | 89 | 1st
30 | 6 | 70 | 2nd
2条答案
按热度按时间uqzxnwby1#
问题出在您查询中
基本上，您要检查
exam_group_class_batch_exam_subject_id列中的值是否等于exam_group_class_batch_exam_subject_id列中的值这总是对的
您必须使用某种语句来传递值
$exam_group_class_batch_exam_subject_id（我不知道您使用的是什么库）edit我看一下codignier文档
试试这个
laximzn52#
您在where条件中指定了字符串值，而不是在getSubjectPosScores函数中作为参数传递的变量值
在查询中使用String Interpolation
替换
public function GetSubjectPosScores($exam_group_class_batch_exam_subject_id) { $sql = "SELECT获取总分FROM考试组考试结果WHERE考试组班级批次考试科目标识=考试组班级批次考试科目标识ORDER BY获取总分DESC"; $query = $this->db->query($sql); return $query->result(); }用这个
public function GetSubjectPosScores($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) { $sql = "SELECT获取总分FROM考试组考试结果WHERE考试组班级批次考试科目标识= '".$exam_group_class_batch_exam_subject_id."' ORDER BY获取总分DESC"; $query = $this->db->query($sql); return $query->result(); }