PHP SQL选择日期之间的行

Question

我正在尝试创建预订系统，并想检查两个日期之间是否已进行预订。但是，我的SQL总是返回false。

$reservation_date_start = date('y-m-d', strtotime($fields['reservation_date_start']));
$reservation_date_end = date('y-m-d', strtotime($fields['reservation_date_end']));

// Save data to database
$table_name = $wpdb->prefix . 'mb_bookings';

$date_exists = $wpdb->get_results("SELECT * FROM $table_name 
WHERE (reservation_date_start >= $reservation_date_start AND reservation_date_start < $reservation_date_end ) 
OR (reservation_date_end >= $reservation_date_start AND reservation_date_end < $reservation_date_end) 
AND (accommodation_id = $accommodation_id)"
);

我已经尝试过使用BETWEEN功能，但也没有取得任何成功。

数据库中的日期是正确的（y-m-d）

Db示例：

任何帮助都会非常感激，因为我已经挣扎了好几天了......

Answer 1

日期格式y-m-d给出16-04-01。将其更改为Y-m-d即可获得2016-04-01。查询应该可以正常工作。

如果我理解你的需要，你想检查两个时期是否重叠。我认为应该这样做（标记添加的parnetheses和撇号）：

SELECT *
FROM $table_name 
WHERE 
(
    (
     STR_TO_DATE('$reservation_date_start', '%Y-%m-%d') <= reservation_date_end
     AND
     STR_TO_DATE('$reservation_date_end', '%Y-%m-%d') > reservation_date_start
    )
OR
    (
     STR_TO_DATE('$reservation_date_end', '%Y-%m-%d') >= reservation_date_start
     AND
     STR_TO_DATE('$reservation_date_start', '%Y-%m-%d') < reservation_date_end
    )
)
AND (accommodation_id = $accommodation_id)

修改

重叠的简化条件：

SELECT *
FROM $table_name 
WHERE 
        STR_TO_DATE('$reservation_date_end', '%Y-%m-%d') >= reservation_date_start
    AND STR_TO_DATE('$reservation_date_start', '%Y-%m-%d') <= reservation_date_end
    AND accommodation_id = $accommodation_id

Answer 2

$reservation_date_start = date('Y-m-d',strtotime($fields['reservation_date_start']));
$reservation_date_end = date('Y-m-d', strtotime($fields['reservation_date_end']));

Answer 3

SELECT * FROM $ table_name WHERE date_filed BETWEEN reservation_date_start AND $ reservation_date_end;