如何判断事务是FALSE还是发生了其他事情（锁定表）？
$this->db->trans_start();
$this->db->where( id , $id)
->limit(1);
$q = $this->db->delete( table );
$this->db->trans_complete();
return $this->db->trans_status() ? TRUE : FALSE;
例如，事务可能会因为外键约束而失败。如果是这种情况，我会运行另一个查询。在任何其他情况下，我都希望重试原始查询。
检查查询是否成功
if($q)
echo ok
else
echo ko
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