Question

我写下面的代码

$this->db->select('SUM(qty) as total_qty,(FORMAT(SUM(amount),2)) as total_amount');
$this->db->where('Invoice_Rec_No',$Invoice_Rec_No);
$result=$this->db->get($this->invoice_products_tbl);
$total_data=$result->row();

但是收到错误

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 'FROM (tbl_invoice_products) WHERE Invoice_Rec_No = 7' at line 2

SELECT SUM(qty) as total_qty, (FORMAT(SUM(amount), 2)) as total_amount FROM (tbl_invoice_products) WHERE Invoice_Rec_No = 7

Filename: C:\wamp\www\admin_followme247_master\system\database\DB_driver.php

我想用codeigniter ActiveRecord执行此查询。

Answer 1

db FALSE方法

中的用户第二个参数select

    $this->db->select('SUM(qty) as total_qty,
                       (FORMAT(SUM(amount),2)) as total_amount', FALSE);

CI db类是自动添加(apostrophe) when manipulate sql query, if you pass send parameter FALSE in select`方法然后它与输入保持一致。

Answer 2

您可以像这样格式化代码

$select = array(
    'SUM(qty) as total_qty',
    '(FORMAT(SUM(amount),2)) as total_amount'
);
$this->db->select($select);
$this->db->where('Invoice_Rec_No',$Invoice_Rec_No);
$result=$this->db->get($this->invoice_products_tbl);
$total_data=$result->row();

对于简单的列选择，可以使用字符串，但对于像这样的复杂选择，您可以使用数组或单独选择每个列

Codeigniter $ this-＆gt; db-＆gt; select（）不适用于Round（Max（））或FORMAT（MAX（））

2 个答案: