php - CodeIgniter Active Records 在子查询中的位置

Question

如何使用 codeigniter 事件记录编写 where_in 语句子查询？

$query = $this->db->query("SELECT SUM(a.transaction_payment_amount) FROM 
         transaction_payment a WHERE a.transaction_link IN 
         (SELECT transaction_link FROM transaction WHERE transaction_type = '22'");
$result = $query->result();

现在如何将上述查询转换为 CI 事件记录？

我已经尝试过:

$this->db->select("SUM(a.transaction_payment_amount)");
$this->db->from('transaction_payment a');
$this->db->where_in('a.transaction_link', "SELECT transaction_link from transaction WHERE transaction_type = '22'");
$query = $this->db->get();
$result = $query->result();

但是这不起作用。

Answer 1

试试这个

$this->db->where_in('a.transaction_link', "SELECT transaction_link from transaction WHERE transaction_type = '22'",false);

如果您使用 false 那么它将从 where_in 条件中删除单引号