php - Active Record 查询中的 Codeigniter 括号

Question

我有这个 ActiveRecord 来生成查询，

$this->purchase_requisition_model
  ->where('deleted','1')
  ->likes('to',$sapfvalue,'both')
  ->likes('date',$sapfvalue,'both')
  ->likes('request_by',$sapfvalue,'both')
  ->likes('deliver_to',$sapfvalue,'both')
  ->likes('name',$sapfvalue,'both')
   ->likes('telephone',$sapfvalue,'both')
  ->likes('designation',$sapfvalue,'both')
  ->likes('budget_status',$sapfvalue,'both')
  ->find_all();

上面的 ActiveRecord 将产生以下查询，

SELECT  * FROM (`purchase_requisition`)
WHERE `deleted` =  '1'
AND  `to`  LIKE '%fg%'
OR  `date`  LIKE '%fg%'
OR  `request_by`  LIKE '%fg%'
OR  `deliver_to`  LIKE '%fg%'
OR  `name`  LIKE '%fg%'
OR  `telephone`  LIKE '%fg%'
OR  `designation`  LIKE '%fg%'
OR  `budget_status`  LIKE '%fg%'

但是如何使用 ActiveRecord 生成以下查询？

SELECT  * FROM (`purchase_requisition`)
WHERE `deleted` =  '1'
AND  (  `to`  LIKE '%fg%'
OR  `date`  LIKE '%fg%'
OR  `request_by`  LIKE '%fg%'
OR  `deliver_to`  LIKE '%fg%'
OR  `name`  LIKE '%fg%'
OR  `telephone`  LIKE '%fg%'
OR  `designation`  LIKE '%fg%'
OR  `budget_status`  LIKE '%fg%' )

Answer 1

正如@M Khalid Junaid所指出的，Codeigniter 的活动记录库不支持分组的 where 子句。您可以通过使用“where”来创建解决方法，同时防止 Codeigniter 自动转义查询：

$escaped_sapfvalue = $this->db->escape( $sapfvalue );
$this->purchase_requisition_model
->where('deleted','1')
->where("( `to` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `date` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `request_by` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `deliver_to` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `name` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `telephone` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `designation` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->where("OR `budget_status` LIKE '%{$escaped_sapfvalue}%' )", null, FALSE)
->find_all();

请注意我如何手动转义变量以防止 SQL 注入。还要注意第一个和最后一个“LIKE”如何分别包含左括号和右括号。

虽然这可行，但它有很多重复的代码。遍历数组会更优雅：

$escaped_sapfvalue = $this->db->escape( $sapfvalue );
$or_like = '';

foreach( $column_list as $column ) {
    // If it's not the first column, add 'OR'
    if ( strlen($or_like) > 0 ) {
        $or_like .= ' OR ';
    }
    // Concatenate manually escaped columns and rows
    $escaped_column = $this->db->escape( $column );
    $or_like .= "`{$escaped_column}` LIKE '%{$escaped_sapfvalue}%'";
}

// Add grouping parenthesis
$grouped_or_like = "( {$or_like} )";

// Build the query
$this->purchase_requisition_model
->where('deleted','1')
->where( $grouped_or_like, null, false )
->find_all();

编辑：虽然我没有测试它，但我只是认为这也应该有效：

$escaped_sapfvalue = $this->db->escape( $sapfvalue );
$this->purchase_requisition_model
->where('deleted','1')
->where("( `to` LIKE '%{$escaped_sapfvalue}%'", null, FALSE)
->or_like('date',$sapfvalue,'both')
->or_like('request_by',$sapfvalue,'both')
->or_like('deliver_to',$sapfvalue,'both')
->or_like('name',$sapfvalue,'both')
->or_like('telephone',$sapfvalue,'both')
->or_like('designation',$sapfvalue,'both')
->where("OR `budget_status` LIKE '%{$escaped_sapfvalue}%' )", null, FALSE)
->find_all();

选择最适合您的。

Answer 2

您也可以使用查询分组。

代码将如下所示：

$this->db->where('deleted', 1);
$this->db->group_start();
$this->db->or_like('to', $sapfvalue, 'both')
$this->db->or_like('date', $sapfvalue, 'both')
$this->db->or_like('request_by', $sapfvalue,  'both')
$this->db->or_like('deliver_to', $sapfvalue, 'both')
$this->db->or_like('name', $sapfvalue, 'both')
$this->db->or_like('telephone', $sapfvalue, 'both')
$this->db->or_like('designation', $sapfvalue, 'both')
$this->db->or_like('budget_status', $sapfvalue, 'both')
$this->db->group_end();

$q = $this->db->get('table')->result();

使用 group_start 和 group_end 可确保在 then 之间的这部分 or_like 语句将进入括号。