将包含 DATEDIFF 和 LIKE 的原始 SQL 转换为 CodeIgniter 活动记录语法

Question

SELECT 
    case_id,
    serialnumber,
    DateLastHere,
    Bookedindate,
    DATEDIFF(DateLastHere,Bookedindate) 
FROM `cases` 
WHERE serialnumber like 'TTTT46'

Answer 1

你可以这样做

$data   =   array(
            'case_id',
            'serialnumber',
            'DateLastHere',
            'Bookedindate',
            'DATEDIFF(DateLastHere,Bookedindate)'
            );
$this->db->select($data);
$this->db->from('cases');
$this->db->like('serialnumber','TTTT46');
$query = $this->db->get()->result_array();

Answer 2

• 如果您想在 LIKE 搜索值的两侧使用通配符：

  SELECT `case_id`, `serialnumber`, `DateLastHere`, `Bookedindate`, DATEDIFF(DateLastHere,Bookedindate)
  FROM `cases`
  WHERE `serialnumber` LIKE '%TTTT46%' ESCAPE '!'
  

  代码点火器：

  $this->db
      ->select([
          'case_id',
          'serialnumber',
          'DateLastHere',
          'Bookedindate',
          'DATEDIFF(DateLastHere,Bookedindate)'
      ])
      ->like('serialnumber','TTTT46')
      ->get('cases')
  

  
  

---

• 如果您不想在 LIKE 搜索值上使用任何通配符：

  SELECT `case_id`, `serialnumber`, `DateLastHere`, `Bookedindate`, DATEDIFF(DateLastHere,Bookedindate)
  FROM `cases`
  WHERE `serialnumber` LIKE 'TTTT46' ESCAPE '!'
  

  代码点火器：

  $this->db
      ->select([
          'case_id',
          'serialnumber',
          'DateLastHere',
          'Bookedindate',
          'DATEDIFF(DateLastHere,Bookedindate)'
      ])
      ->like('serialnumber','TTTT46')
      ->get('cases');
  

  
  

---

• 如果你想匹配整个字符串，那么 LIKE 没有帮助：

  SELECT `case_id`, `serialnumber`, `DateLastHere`, `Bookedindate`, DATEDIFF(DateLastHere,Bookedindate)
  FROM `cases`
  WHERE `serialnumber` = 'TTTT46'
  

  代码点火器：

  $this->db
      ->select([
          'case_id',
          'serialnumber',
          'DateLastHere',
          'Bookedindate',
          'DATEDIFF(DateLastHere,Bookedindate)'
      ])
      ->get_where('cases', ['serialnumber' => 'TTTT46']);
  

  
  

---

• 如果您想显式地将 DATEDIFF 列括在标识符引号中，请使用

  escape_identifiers()

  :

  SELECT `case_id`, `serialnumber`, `DateLastHere`, `Bookedindate`, DATEDIFF(`DateLastHere`,`Bookedindate`)
  FROM `cases`
  WHERE `serialnumber` = 'TTTT46'
  

  代码点火器：

  $this->db
      ->select([
          'case_id',
          'serialnumber',
          'DateLastHere',
          'Bookedindate',
          sprintf(
              'DATEDIFF(%s,%s)',
              $this->db->escape_identifiers('DateLastHere'),
              $this->db->escape_identifiers('Bookedindate')
          )
      ])
      ->get_where('cases', ['serialnumber' => 'TTTT46']);