编辑

Question

你能告诉我如何用Codeigniter的方式编写数据库查询来搜索日期字段中的月份吗？或者，您能否告诉我如何以codeigniter的方式编写以下查询？

提前致谢：）

 "SELECT attendanceno FROM attendance WHERE (barcodeid = '$studentid') AND  (month(attendancedate)='$month' AND year(attendancedate)='$year') ";

编辑

感谢Stefan，他在下面回答了我的问题。阅读他的帖子后，我也尝试了以下脚本，发现它有效。这就是为什么我只是想分享以防任何人想要使用它。但所有的功劳都归功于斯特凡。：）

  $this->db->select('*');
  $this->db->from('attendance');
  $this->db->where('barcodeid', $studentid);
  $this->db->where('month(attendancedate)', $month);
  $this->db->where('year(attendancedate) ', $year);
  $this->db->order_by('attendancedate ','ASC');     
  $getData = $this->db->get('', $perPage, $uri);

Answer 1

如果日期和月份是字符串：

$this->db->query("SELECT attendanceno FROM attendance WHERE (barcodeid = ?) AND  (month(attendancedate)=? AND year(attendancedate)=?)", array($studentid, $month,$year));

如果它们是整数

$this->db->query("SELECT attendanceno FROM attendance WHERE (barcodeid = ?) AND  (MONTH(attendancedate)='?' AND YEAR(attendancedate)='?')", array($studentid, $month,$year));

Answer 2

假设：

CodeIgniter 2.2.0

Oracle 11数据库

//Option 1, raw SQL
 $sql = "
  SELECT DISTINCT <DATE_COLUMN>
  FROM <TABLE NAME>
  WHERE 1=1
    AND EXTRACT(month FROM <DATE_COLUMN>) = $month
    AND EXTRACT(year FROM <DATE_COLUMN>) = $year
 ";
 $query = $this->db->query($sql);

//Option 2, CI db functions
$this->db->distinct();
$this->db->select('<DATE_COLUMN>');
$this->db->where('EXTRACT(month FROM <DATE_COLUMN>) =', $month);
$this->db->where('EXTRACT(year FROM <DATE_COLUMN>) =', $year);
$query = $this->db->get('<TABLE NAME>');

两者都会产生以下内容：$ month = 3和$ year = 2017：

     CI_DB_oci8_result Object
     (
         [stmt_id] => Resource id #9
         [curs_id] => 
         [limit_used] => 
         [conn_id] => Resource id #1
         [result_id] => 1
         [result_array] => Array
             (
                 [0] => Array
                     (
                         [<DATE_COLUMN>] => 22-MAR-17
                     )

                 [1] => Array
                     (
                         [<DATE_COLUMN>] => 14-MAR-17
                     )

                 [2] => Array
                     (
                         [<DATE_COLUMN>] => 02-MAR-17
                     )

                 [3] => Array
                     (
                         [<DATE_COLUMN>] => 06-MAR-17
                     )

             )

         [result_object] => Array
             (
             )

         [custom_result_object] => Array
             (
             )

         [current_row] => 0
         [num_rows] => 4
         [row_data] => 
     )

如何用Codeigniter的方式编写数据库查询来搜索日期字段中的月份？

编辑

2 个答案: