已解決在SQL查詢中插入PHP variabel Codeigniter

Question

我正在使用代碼點火器來使用一些查詢，這是我的代碼到目前爲止，我的代碼是否正確？

$this->db->select("(SELECT SUM(grand_total) FROM Sales_order WHERE member = '2') - (SELECT SUM(amount) FROM payment WHERE member_id = '2') AS total_sales"); 

以及如何更改號碼2本variabel $這 - >會話級>用戶數據（ 'ID'）

謝謝你們

Answer 1

試試這個

$this->db->select("(SELECT SUM(grand_total) FROM Sales_order WHERE member = '".$this->session->userdata('ID')."') - (SELECT SUM(amount) FROM payment WHERE member_id = '".$this->session->userdata('ID')."') AS total_sales"'); 

Answer 2

你可以使用Query Bindings像下面這樣自動轉義它：

$sql = "(SELECT SUM(grand_total) FROM Sales_order WHERE member = '?') - (SELECT SUM(amount) FROM payment WHERE member_id = '?') AS total_sales"; 
$this->db->query($sql, array($this->session->userdata('ID'),$this->session->userdata('ID')));