返回结果表单查询-仅显示在一行上

Question

很简单，但我做不到。 我有一个查询，我希望查询结果仅显示一次。 在我的代码中，课程名称显示的次数与行数相同。 我使用Codeigniter。 我的代码是：

foreach ($timetable as $row) {
    echo $row->course_name;  
} 

我的查询是：

public function select_timetable() {

        $this->db->select('sequence_num, topic, courses_specific_id, courses_common.course_name,
        courses_specific.course_place, courses_common.courses_common_id, timetable.timetable_id');
        $this->db->from('timetable');  
        $this->db->join('courses_common', 'courses_common.courses_common_id=timetable.courses_common_id');
        $this->db->join('courses_specific', 'courses_specific.courses_common_id=courses_common.courses_common_id');

        $this->db->where('courses_specific_id', $this->input->post('courses_specific_id'));
        $result=$this->db->get();
              return $result->result();
    }

并且var_dump($timetable[0])是：

object(stdClass)#27 (7) { 
    ["sequence_num"]=> string(1) "1" 
    ["topic"]=> string(10) "HTML tags " 
    ["courses_specific_id"]=> string(1) "1" 
    ["course_name"]=> string(4) "HTML" 
    ["course_place"]=> string(6) "Center" 
    ["courses_common_id"]=> string(1) "1" 
    ["timetable_id"]=> string(1) "1" 
} 

HTMLobject(stdClass)#27 (7) { 
    ["sequence_num"]=> string(1) "1" 
    ["topic"]=> string(10) "HTML tags " 
    ["courses_specific_id"]=> string(1) "1" 
    ["course_name"]=> string(4) "HTML"
    ["course_place"]=> string(6) "Center"
    ["courses_common_id"]=> string(1) "1" 
    ["timetable_id"]=> string(1) "1" 
} 

HTMLobject(stdClass)#27 (7) { 
    ["sequence_num"]=> string(1) "1" 
    ["topic"]=> string(10) "HTML tags "
    ["courses_specific_id"]=> string(1) "1" 
    ["course_name"]=> string(4) "HTML" ["course_place"]=> string(6) "Center" ["courses_common_id"]=> string(1) "1" ["timetable_id"]=> string(1) "1" } HTML

Answer 1

要访问结果，您必须执行以下操作：

<?php
foreach ($timetable->result() as $row)
{      
 echo $row->course_name;  
} 
?>

如果您只想显示一行，则需要执行以下操作：

if ($timetable->num_rows() > 0)
{
$row = $timetable->row_array(); 
  echo $row['course_name'];
}

您还可以浏览不同的行，例如：

$row = $timetable->first_row()
$row = $timetable->last_row()
$row = $timetable->next_row()
$row = $timetable->previous_row()