Php CodeIgniter查询到哪里

我有以下资料：

/** Load necessary stuff **/
        $this->load->helper('date');

        $this->db->get('site_requests');
        //echo mdate('%Y-%m-%d %H:%i:%s', now());
        //die;
        $this->db->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")");
        $this->db->get();
        print_r($this->db->last_query());

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 'WHERE (`created_for` <= '2019-04-24 18:47:03')' at line 2

SELECT * WHERE (`created_for` <= '2019-04-24 18:47:03')

Filename: modules/sound/models/Sound_request_model.php

Line Number: 35

但我收到以下信息：

/** Load necessary stuff **/
        $this->load->helper('date');

        $this->db->get('site_requests');
        //echo mdate('%Y-%m-%d %H:%i:%s', now());
        //die;
        $this->db->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")");
        $this->db->get();
        print_r($this->db->last_query());

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 'WHERE (`created_for` <= '2019-04-24 18:47:03')' at line 2

SELECT * WHERE (`created_for` <= '2019-04-24 18:47:03')

Filename: modules/sound/models/Sound_request_model.php

Line Number: 35

---

我做错了什么？

尝试使用键值表单：

$this->db->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")");

---

$this->db->wherecreated\u for您缺少对查询的FROM部分的定义。 我认为您只需要更改代码：

    $query = $this->db->from('site_requests')
       ->where("(created_for <= " . "'2019-04-24 18:47:03'" . ")")
       ->get();
    $result = $query->result();
    print_r($result);

---

你可以把它放在一个语句中

    $this->db->get_where('site_requests', array('created_for <=', '2019-04-24 18:47:03'));
    print_r($this->db->last_query());

您需要链->结果或结果数组或任何输出函数来获取数据返回

希望这能有所帮助