这是我正常的mysql查询:
$sql = "SELECT * FROM item order by ";
if(my_condition)
{
$sql. = "FIELD(`category`, 'Auto & Accessories', 'Couch', 'Bed',
'Desk & Office', 'Bike & Scooter', 'Tools', 'Leisure',
'Iron & Wood', 'Cabinet', 'Kitchen & Accessories', 'Refrigerator & Appliances',
'Toys & Games', 'Chair', 'Table', 'Garden & Terrace', 'TV, HIFI & Computers',
'General Item')";
}
else
{
$sql .= "category asc";
}
我在活动记录中的CI中需要它。我尝试了以下方式:
if(my_condition)
{
$this->db->order_by("FIELD(`category`, 'Auto & Accessories', 'Couch',
'Bed', 'Desk & Office', 'Bike & Scooter', 'Tools', 'Leisure', 'Iron &
Wood', 'Cabinet', 'Kitchen & Accessories', 'Refrigerator &
Appliances', 'Toys & Games', 'Chair', 'Table', 'Garden & Terrace',
'TV, HIFI & Computers', 'General Item')");
}
else
{
$this->db->order_by("category", "asc");
}
但是,我收到了这个错误::
Error Number: 1064
You have an error in your SQL syntax; check the manual that corresponds to your
MySQL server version for the right syntax to use near 'Couch'`, `'Bed'`, `'Desk` &
Office', `'Bike` & Scooter', `'Tools'`, `'Leisure'`,' at line 6
Filename: C:\xampp\htdocs\straatjutter_service\system\database\DB_driver.php
Line Number: 330
如何解决?实际上我需要以上面的格式排序我的项目类别。这可以在普通的mysql查询中完成。但是,在活动记录中这样做会感到困惑。
答案 0 :(得分:3)
试试这个::
$this->db->select('i.id, condition, description, created_at, updated_at, category, latitude, longitude, status, d.device_token, d.facebook, d.preferred, d.email, d.phone');
$this->db->select("CONCAT('$url', `image_url_original`) AS `image_url_original`", false);
$this->db->select("CONCAT('$url', `image_url_mid`) AS `image_url_mid`", false);
$this->db->select("CONCAT('$url', `image_url_thumb`) AS `image_url_thumb`", false);
$this->db->select("FIELD(`category`, 'Auto & Accessories', 'Couch', 'Bed', 'Desk & Office', 'Bike & Scooter', 'Tools', 'Leisure', 'Iron & Wood', 'Cabinet', 'Kitchen & Accessories', 'Refrigerator & Appliances', 'Toys & Games', 'Chair', 'Table', 'Garden & Terrace', 'TV, HIFI & Computers', 'General Item') AS `sort_col`", false);
$this->db->from('item as i');
$this->db->join('device as d', 'i.device_id = d.device_token');
$this->db->where('created_at > DATE_SUB(UTC_TIMESTAMP(), INTERVAL 24 HOUR)');
$this->db->where('i.status', 'shared');
if($language === 'nl_NL') {
$this->db->order_by('sort_col', 'asc');
} else {
$this->db->order_by('category', 'asc');
}
答案 1 :(得分:1)
更好地使用这种方式
$ids = "1,3,2,4";
$qry ="SELECT * FROM (`destination`) WHERE `id` IN ($ids) ORDER BY `FIELD` ( id, $ids )";
$result = $this->db->query($qry);
return $result->result();