Php 测试单个查询中的日期是否重叠
非常感谢您抽出时间来看看我的问题。我是mysql驱动的web应用程序的新手,在计算查询时遇到了一些麻烦 我有三张桌子: 活动: 表演者: 活动参与者: 检索我使用的事件数据Php 测试单个查询中的日期是否重叠,php,mysql,Php,Mysql,非常感谢您抽出时间来看看我的问题。我是mysql驱动的web应用程序的新手,在计算查询时遇到了一些麻烦 我有三张桌子: 活动: 表演者: 活动参与者: 检索我使用的事件数据 SELECT * FROM events JOIN event_performers ON events.event_id = event_performers.event_id 我想运行一个测试查询,以确定是否有任何执行者同时处理不同的事件 我试图检索所有执行者ID、所有事件ID,并通过它们中的每一个循环来比较日期,
SELECT *
FROM events
JOIN event_performers
ON events.event_id = event_performers.event_id
我想运行一个测试查询,以确定是否有任何执行者同时处理不同的事件
我试图检索所有执行者ID、所有事件ID,并通过它们中的每一个循环来比较日期,但我在做foreach循环时遇到了麻烦,无法真正让它工作
include('app/config.php');
function return_all_performers(){
include(PATH . '/core/model/db_connect.php');
try {
$query_object = $db->query("
SELECT performer_id
FROM performers
");
} catch (Exception $e){
include_once(PATH . "/core/view/error.php");
exit();
}
return $query_object->fetchAll(PDO::FETCH_COLUMN, 0);
}
function return_all_performer_events($performer_id){
include(PATH . '/core/model/db_connect.php');
try {
$query_object = $db->prepare("
SELECT *
FROM events
JOIN event_performers
ON events.event_id = event_performers.event_id
WHERE event_performers.performer_id = :performer_id
");
$query_object->bindParam(':performer_id', $performer_id);
$query_object->execute();
} catch (Exception $e){
include_once(PATH . "/core/view/error.php");
exit();
}
return $query_object->fetchAll(PDO::FETCH_ASSOC);
}
$performers_ids = return_all_performers();
$overlaps = array();
foreach ($performers_ids as $performer_id) {
$performer_events = return_all_performer_events($performer_id);
foreach ($performer_events as $event => $value) {
// Isolate Single event and compare it to others
// TO DO
// Check If times overlaps
/*
foreach () {
if(
strtotime($event['start_time']) >= strtotime($isolated_event['start_time']) &&
strtotime($event['start_time']) <= strtotime($isolated_event['stop_time'])
){
return true;
}
if(
strtotime($event['stop_time']) >= strtotime($isolated_event['start_time']) &&
strtotime($event['stop_time']) <= strtotime($isolated_event['stop_time'])
){
$overlaps[] = $event;
}
}
*/
}
}
var_dump($overlaps);
非常感谢您的帮助,
CheersMySQL有一个子句,将您的查询呈现给:
SELECT *
FROM events
JOIN event_performers
ON events.event_id = event_performers.event_id
WHERE start_time BETWEEN ? OR ? AND stop_time BETWEEN ? and ?
希望这有助于 您可以使用类似
SELECT
COUNT(*) AS amount_of_overlaps
FROM
events_table AS e1
JOIN (SELECT * FROM events_table) AS e2 ON (e2.id > e1.id)
WHERE
(e2.start_date BETWEEN e1.start_date AND e1.end_date)
OR
(e2.end_date BETWEEN e1.start_date AND e1.end_date)
以获取重叠事件的数量。
你只需要为一个特定的人增加你的限制
SELECT ep.performer_name, ep.performer_id, ep.performer_fee, e.event_id, e.event_fee,
e.start_time, e.stop_time, group_concat(e2.event_id SEPARATOR ',')
FROM events as e
JOIN event_performers ep ON e.event_id = ep.event_id
join events e2 on e2.event_id != e.event_id and
greatest(e2.start_time, e.start_time) < least(e2.stop_time,e.stop_time)
join event_performers ep2 on ep2.event_id=e2.event_id and ep2.performer_id=ep.performer_id
group by ep.performer_name, ep.performer_id, ep.performer_fee, e.event_id, e.event_fee,
e.start_time, e.stop_time
这将返回每个有冲突的事件,并将列出与之冲突的每个事件。它可能会产生有趣的数据,因为如果A、B和C都冲突,您将得到3行。1说A与B和C冲突,另一个说B与A和C冲突,还有一个说C与A和B冲突。也许你可以在PHP中随心所欲地清理它,但这些数据可能是一个好的开始 你可能想这样或那样。寻找重叠,而不是包含。哇,老兄!我不知道你是怎么做到的,但似乎效果很好!,谢谢你;
SELECT *
FROM events
JOIN event_performers
ON events.event_id = event_performers.event_id
WHERE start_time BETWEEN ? OR ? AND stop_time BETWEEN ? and ?
SELECT
COUNT(*) AS amount_of_overlaps
FROM
events_table AS e1
JOIN (SELECT * FROM events_table) AS e2 ON (e2.id > e1.id)
WHERE
(e2.start_date BETWEEN e1.start_date AND e1.end_date)
OR
(e2.end_date BETWEEN e1.start_date AND e1.end_date)
SELECT ep.performer_name, ep.performer_id, ep.performer_fee, e.event_id, e.event_fee,
e.start_time, e.stop_time, group_concat(e2.event_id SEPARATOR ',')
FROM events as e
JOIN event_performers ep ON e.event_id = ep.event_id
join events e2 on e2.event_id != e.event_id and
greatest(e2.start_time, e.start_time) < least(e2.stop_time,e.stop_time)
join event_performers ep2 on ep2.event_id=e2.event_id and ep2.performer_id=ep.performer_id
group by ep.performer_name, ep.performer_id, ep.performer_fee, e.event_id, e.event_fee,
e.start_time, e.stop_time