Question

CodeIgniter Active Record非常简单，文档齐全且功能强大。但是当我尝试插入MySQL内置函数CONCAT，NOW，GROUP_CONCAT，DATEDIFF，TRIM等或我的自定义函数时，它会给出错误。以下代码工作正常......

$result = $this->db->select('p.first_name, p.last_name, p.mobile_number, p.email_address')->from('profile p')->get()->result();

但是当我想联系first_name和last_name并使用MySQL CONCAT这样的函数时......

$result = $this->db->select('CONCAT(p.first_name, " ", p.last_name) fullname, p.mobile_number, p.email_address')->from('profile p')->get()->result();

显示数据库错误

A Database Error Occurred

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 '", `p`.`last_name)` fullname, `p`.`mobile_number`, `p`.`email_address` FROM (`pr' at line 1

SELECT CONCAT(p.first_name, `"` ", `p`.`last_name)` fullname, `p`.`mobile_number`, `p`.`email_address` FROM (`profile` p)

Filename: D:\xampp\htdocs\example\system\database\DB_driver.php

Line Number: 330

有没有办法在CodeIgniter Active Record中插入MySQL函数？希望我很清楚。提前谢谢。

Answer 1

因为我不知道你的确切错误：

来自user_guide：

$ this-＆gt; db-＆gt; select（）接受可选的第二个参数。如果将其设置为FALSE，CodeIgniter将不会尝试使用反引号来保护您的字段或表名称。如果您需要复合选择语句，这非常有用。

$result = $this->db->select('CONCAT(p.first_name, " ", p.last_name) fullname, p.mobile_number, p.email_address', FALSE)->from('profile p')->get()->result();

Answer 2

将“select”放在数组中 $ this-＆gt; db-＆gt; select（array（'CONCAT（p.first_name，“”，p.last_name）fullname，p.mobile_number，p.email_address'））

通过。

Answer 3

对于使用活动记录进行更新的情况，您可以使用

$this->db->set("date_read", "NOW()", FALSE);

会输出类似这样的内容

`SET `date_read` = NOW(),

Answer 4

固定问题

在活动记录数组中添加字段名称可以解决此问题。在数组内部你可以使用任何mysql函数。上面的解决方案。

MySQL表：

fullname             mobile_number  email_address                 
-------------------  -------------  ------------------------------
sitaramaiah javvadi  9989403339     gnt.sitaramaiah@mstonline.in  
raja kumar guthula   9949526012     gnt.rajkumar@mstonline.in     
chandra sekhar k.l   9912144556     gnt.sekhar@mstonline.in       
khadar  basha        98884884584    khadar333332@gmail.com        
super administrator  9841866445     admin@gmail.com

CodeIgniter Active Record：

$result = $this->db->select(array('CONCAT(p.first_name, " ", p.last_name) `fullname`', 'p.mobile_number', 'p.email_address'))->from('profile `p`')->get()->result();
echo '<pre>';
print_r($result);

输出：

Array
(
    [0] => stdClass Object
        (
            [fullname] => sitaramaiah javvadi
            [mobile_number] => 9989403339
            [email_address] => gnt.sitaramaiah@mstonline.in
        )

    [1] => stdClass Object
        (
            [fullname] => raja kumar guthula
            [mobile_number] => 9949526012
            [email_address] => gnt.rajkumar@mstonline.in
        )

    [2] => stdClass Object
        (
            [fullname] => chandra sekhar k.l
            [mobile_number] => 9912144556
            [email_address] => gnt.sekhar@mstonline.in
        )

    [3] => stdClass Object
        (
            [fullname] => khadar  basha
            [mobile_number] => 98884884584
            [email_address] => khadar333332@gmail.com
        )

    [4] => stdClass Object
        (
            [fullname] => super administrator
            [mobile_number] => 9841866445
            [email_address] => admin@gmail.com
        )

)

MySQL函数和CodeIgniter活动记录

4 个答案: