Question

假设我在数据库中有一条记录，其日期时间为：2016-03-10 00:00:00，结束日期时间2016-03-10 06:00:00。现在，每次我在数据库中插入新记录时，我都要检查启动DateTime＆amp;结束日期时间使得持续时间不会与数据库中存在的先前记录重叠。 PHP CodeIgniter中是否存在任何内置函数来检查它？

现在我正在使用以下代码执行此操作，但它不起作用：

public function check_b_adds($data){
 $sql='select * from listing_b_screen where (start_time >= ? AND end_time >= ?) OR (start_time <= ? AND end_time <= ?) OR (start_time <= ? AND end_time >= ?) OR (start_time = ? AND end_time = ?) OR (start_time >= ? AND end_time <= ?)';
    $query=$this->db->query($sql, array($data['mystart_time'],$data['myend_time'],$data['mystart_time'],$data['myend_time'],$data['mystart_time'],$data['myend_time'],$data['mystart_time'],$data['myend_time'],$data['mystart_time'],$data['myend_time']));
    $result = $query->result_array();
    if ($result == NULL || $result == 0){
        return false;
    } else {
        return True;
    }
}

Answer 1

    $fromdaysDate="2016-07-13";//changed date
    $todaysDate="2016-07-25";//changed date
    $this->db->select('task_id,task_start_date, task_due_date'); 
    $this->db->where('task_start_date <="'.date('Y-m-d', strtotime($fromdaysDate)).'"');
    $this->db->where('task_due_date >="'.date('Y-m-d', strtotime($todaysDate)).'"');    
    $this->db->or_where('task_due_date BETWEEN "'. date('Y-m-d', strtotime($fromdaysDate)). '" and "'. date('Y-m-d', strtotime($todaysDate)).'"');   
    $alltask=$this->db->get('wba_task')->result_array();
    echo $this->db->last_query();

Answer 2

不知道你的db表是什么样的，但下面是一个例子：

public function check_b_adds($data){
    //I suppose your start_time and end_time are stored as datetime type in db like 2016-03-01 07:30:00
    $myStart_time = $data['mystart_time']; //for example, this is a string like 2016-03-01 07:30:00 in the format of %Y-%m-%d %H:%i:%s
    $myEnd_time   = $data['myEnd_time'];   //for example, this is a string like 2016-03-01 09:30:00 in the format of %Y-%m-%d %H:%i:%s

    $query = $this->db("
                          select * 
                          from listing_b_screen 
                          where id not in
                                      (
                                       select id
                                       from listing_b_screen 
                                       where start_time >  STR_TO_DATE('$myEnd_time', '%Y-%m-%d %H:%i:%s')
                                       or end_time      <  STR_TO_DATE('$myStart_time', '%Y-%m-%d %H:%i:%s')                                          
                                      )
                       ");      

    $result = $query->result_array();
    if ($result == NULL || $result == 0){
        return false; //not overlap
    } else {
        return true;
    }
}

请注意您的逻辑错误。例如，db中的start_time和end_time是第3和第7，数组中的start_time和end_time是第1和第2。这不重叠。但你的逻辑start_time＆gt; =？ AND end_time＆gt; =？认为它是重叠的。尝试在查询中使用“not in”

PHP CodeIgniter

2 个答案: