[英]CI: (Count Rows) with same ID
foodorders
foodorders_id foodorders_price foodorders_status
1 100 1
2 20 1
3 30 1
foodorders_detail
foodorders_detail_id(AI,PK) foodorders_id foodorders_foodname foodorders_lines
1 1 burgers 1
2 1 fries 2
3 1 chips 3
4 2 chips 1
5 3 drinks 1
5 3 bars 2
What i want: check how many rows with same foodorders_id and returns to controller我想要什么:检查多少行具有相同的 foodorders_id 并返回 controller
What i tried:我尝试了什么:
$this->db->select('foodorders.foodorders_price,foodorders.status,COUNT(foodorders_detail.foodorders_lines');
$this->db->from('foodorders');
$this->db->join('foodorders_detail', 'foodorders_detail.foodorders_id = sales.foodorders_id', 'left');
add foodorders.foodorders_id to your select columns and add group by to your query and then get result as object or array:将 foodorders.foodorders_id 添加到您的 select 列并将 group by 添加到您的查询中,然后将结果作为 object 或数组:
hint: use alias to shorten your code.提示:使用别名来缩短你的代码。
$this->db->select('foodorders.foodorders_id,foodorders.foodorders_price,foodorders.status,COUNT(foodorders_detail.foodorders_lines)');
$this->db->from('foodorders');
$this->db->join('foodorders_detail', 'foodorders_detail.foodorders_id = foodorders.foodorders_id', 'left');
$this->db->group_by('foodorders.foodorders_id');
$query = $this->db->get();
return $query->result();
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