CodeIgniter 2.0.3中Active Record中奇怪的反引号行为 [英] Weird backticks behaviour in Active Record in CodeIgniter 2.0.3

问题描述

以前，我所有的查询在CI版本2.0中运行都很好，但是当我升级到 2.0.3 时，我的某些SELECT查询就被破坏了。 p> CI自动添加了反引号（``），但在旧版本中，它按原样运行。

CI用户手册已指示在

db-> select

中添加第二个参数

as

FALSE

但是仍然无法正常工作。

代码如下：

  class Company_model扩展MY_Model 
 {
 
 ---------------- 
 
 $ this-> db-> select（'count（'。$ fieldname。'）as num_stations'）; 
 $ this-> db-> select（ CONCAT_WS（’，’，clb_company.address1，clb_company.address2，clb_company.city，clb_company.state，clb_company.zipcode）作为companyAddress）; 
 $ this-> db-> from（$ this-&__ table）; 
 $ this-> db-> join（$ this-> _table_device，$ fieldname1。 =。$ fieldname2，'LEFT'）; 
 $ this-> db-> where（$ blablafield，'0'）; 
 ---------------- 
  

错误如下：

 错误号：1064 
 
您的SQL语法有错误；检查与您的MySQL服务器版本相对应的手册以获取正确的语法，以在
附近使用。'FROM（`clb_device`）JOIN`clb_company` ON`clb_company`.`id` =`clb_device`.com 2 
 
选择`clb_device`.`id作为deviceId，`clb_pricing_specifications`.`name`作为pricesingSpecName，`clb_company`.`name`作为companyName，`clb_device`.`mac_address`作为deviceMacAddress， 
`clb_device`.reseller_model_number`作为deviceModelNumber，`clb_pricing_spec_grouping`.`pricing_master_spec_id`作为pricesingSpecId，`clb_device`.`address`作为deviceAddress，
`clb_device`.`is_home`作为deviceIsHomeCharger，CONCAT（ clb_company.portal_line1，`/'，`clb_device`.`name）`作为deviceDisplayName FROM（`clb_device`）JOIN`clb_company` 
 on`clb_company`.`id` =`clb_device`.`company_id` LEFT JOIN`clb_pricing_group_devices` ON`clb_device`.`id` =`clb_pricing_group_devices.isdevice_id`和clb_pricing_group_devices.is_active = 1 
 LEFT JOIN`clb_pricing_spec_grouping` ON`clb_pricing_groing pricing_spec_id` =`clb_pricing_spec_grouping`.`pricing_master_spec_id`左联接`clb_pricing_specifications` ON 
`clb_pricing_spec_grouping`.pricing_spec_id` =`clb_pricing_specifications`id id。 （clb_devi 
 ce.software_version，1，3）作为十进制（2,1））> 2.0 AND clb_device.device_state> 0 GROUP BY`clb_device`.id` ORDER BY CONCAT（trim（clb_company.portal_line1），'/'，trim（clb_device.name））desc LIMIT 20 
  

看看 CONCAT（trim（clb_company.portal_line1），'/'`，trim（clb_device.name））

请提出解决方法。

解决方案

在查询前使用此行：

  $ this-> db-> _protect_identifiers = false; 
  

这将停止向构建的查询中添加反引号。

Previously my all queries were running fine in CI version 2.0 but when I upgraded to 2.0.3 some of my SELECT queries were broken.

CI is adding backticks (``) automatically, but in older version its running as it is.

CI user manual have instructed to add second parameter in

db->select

as

FALSE

but still it's not working.

Code is as following:

class Company_model extends MY_Model
{

----------------

$this->db->select(' count('.$fieldname. ') as num_stations');
$this->db->select(" CONCAT_WS(',', clb_company.address1, clb_company.address2, clb_company.city, clb_company.state, clb_company.zipcode ) as companyAddress");
$this->db->from($this->_table);
$this->db->join($this->_table_device, $fieldname1. " = ".  $fieldname2, 'LEFT');
$this->db->where($blablafield , '0');
----------------

The error is as follows:

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 (`clb_device`) JOIN `clb_company` ON `clb_company`.`id` = `clb_device`.`com' at line 2

SELECT `clb_device`.`id` as deviceId, `clb_pricing_specifications`.`name` as pricingSpecName, `clb_company`.`name` as companyName, `clb_device`.`mac_address` as deviceMacAddress, 
`clb_device`.`reseller_model_number` as deviceModelNumber, `clb_pricing_spec_grouping`.`pricing_master_spec_id` as pricingSpecId, `clb_device`.`address` as deviceAddress, 
`clb_device`.`is_home` as deviceIsHomeCharger, CONCAT(clb_company.portal_line1, `'/'`, `clb_device`.`name)` as deviceDisplayName FROM (`clb_device`) JOIN `clb_company` 
ON `clb_company`.`id` = `clb_device`.`company_id` LEFT JOIN `clb_pricing_group_devices` ON `clb_device`.`id` = `clb_pricing_group_devices`.`device_id` and clb_pricing_group_devices.is_active = 1 
LEFT JOIN `clb_pricing_spec_grouping` ON `clb_pricing_group_devices`.`pricing_spec_id` = `clb_pricing_spec_grouping`.`pricing_master_spec_id` LEFT JOIN `clb_pricing_specifications` ON 
`clb_pricing_spec_grouping`.`pricing_spec_id` = `clb_pricing_specifications`.`id` WHERE clb_company.vendor_id is not null AND cast(substr(clb_devi
ce.software_version, 1, 3) as decimal(2,1)) > 2.0 AND clb_device.device_state > 0 GROUP BY `clb_device`.`id` ORDER BY CONCAT(trim(clb_company.portal_line1), `'/'`, trim(clb_device.name)) desc LIMIT 20

Have a look at CONCAT(trim(clb_company.portal_line1), `'/'`, trim(clb_device.name))

Please suggest the workaround.

解决方案

Use this line before your query:

$this->db->_protect_identifiers=false;

This will stop adding backticks to the built query.

这篇关于CodeIgniter 2.0.3中Active Record中奇怪的反引号行为的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！