我在找出一个循环时遇到了一些困难。
他们并不是我的强项。 ;）
它使用了一个类＆＃34;查找＆＃34;作为一个看起来像这样的查找表:(为了简洁省略了很多行）
class lookup {
protected $lookup = array(
array('rider_count' => '1', 'heat_count' => '1', 'riders_in_heat_1' => '1'),
array('rider_count' => '2', 'heat_count' => '1', 'riders_in_heat_1' => '2'),
array('rider_count' => '3', 'heat_count' => '1', 'riders_in_heat_1' => '3'),
array('rider_count' => '4', 'heat_count' => '1', 'riders_in_heat_1' => '4'),
array('rider_count' => '5', 'heat_count' => '1', 'riders_in_heat_1' => '5'),
array('rider_count' => '6', 'heat_count' => '1', 'riders_in_heat_1' => '6'),
array('rider_count' => '7', 'heat_count' => '1', 'riders_in_heat_1' => '7'),
array('rider_count' => '8', 'heat_count' => '2', 'riders_in_heat_1' => '4', 'riders_in_heat_2' => '4'),
array('rider_count' => '9', 'heat_count' => '2', 'riders_in_heat_1' => '5', 'riders_in_heat_2' => '4'),
array('rider_count' => '10', 'heat_count' => '2', 'riders_in_heat_1' => '5', 'riders_in_heat_2' => '5'),
array('rider_count' => '11', 'heat_count' => '2', 'riders_in_heat_1' => '6', 'riders_in_heat_2' => '5'),
array('rider_count' => '12', 'heat_count' => '2', 'riders_in_heat_1' => '6', 'riders_in_heat_2' => '6'),
array('rider_count' => '13', 'heat_count' => '2', 'riders_in_heat_1' => '7', 'riders_in_heat_2' => '6'),
array('rider_count' => '14', 'heat_count' => '2', 'riders_in_heat_1' => '7', 'riders_in_heat_2' => '7')
);
public function select ($field, $value)
{
$list = array();
foreach ($this->lookup as $count)
{
if ($count[$field] == $value)
{
$list[] = $count;
}
}
return $list;
}
}
$classes = new lookup();
我的php：
<?php
// get entries for the event
function getEntries($class_id, $limit, $offset)
{
global $db;
$getentries = $db->prepare("SELECT entry_id FROM tbl_event_entries WHERE event_id = :event_id AND class_id = :class_id LIMIT :offset, :limit");
$getentries->bindValue(':event_id', $_GET['event_id']);
$getentries->bindValue(':class_id', $class_id);
$getentries->bindValue(':limit', $limit);
$getentries->bindValue(':offset', $offset);
$getentries->execute();
while ($r = $getentries->fetch(PDO::FETCH_ASSOC)) return $r['entry_id'];
}
// get count of entries per class
// get classes for the event
$geteventclasses = $db->prepare("SELECT class_id FROM tbl_event_classes WHERE event_id = :event_id");
$geteventclasses->bindValue(':event_id', $_GET['event_id']);
$geteventclasses->execute();
while ($r = $geteventclasses->fetch(PDO::FETCH_ASSOC))
{
$getentriesperclass = $db->prepare("SELECT entry_id FROM tbl_event_entries WHERE class_id = :class_id AND event_id = :event_id");
$getentriesperclass->bindValue(':class_id', $r['class_id']);
$getentriesperclass->bindValue(':event_id', $_GET['event_id']);
$getentriesperclass->execute();
$r2count = $getentriesperclass->rowCount();
$counts[$r['class_id']] = $r2count;
}
foreach ($counts as $class => $rider_count)
{
$list = $classes->select('rider_count', $rider_count);
echo "class: ". $class ."; ridercount: " . $list[0]['rider_count'] ."; heats: ". $list[0]['heat_count'] ." heats, consisting of :<br>\n";
for ($i = 1; $i <= $list[0]['heat_count']; $i++)
{
if ($list[0]['heat_count'] > 0)
{
for ($rih = 1; $rih <= $list[0]['riders_in_heat_'.$i]; $rih++)
{
$offset = 1;
echo "<li>Heat ". $i ." : ". getEntries($class, $list[0]['riders_in_heat_'.$i], $offset) ." </li>";
}
$offset = $offset + $list[0]['riders_in_heat_'.$i];
}
}
echo "</ul>";
}
?>
这将最终构建一个更新查询来分配＆＃34; heat_nbr＆＃34;和＆＃34; heat_position＆＃34;到每个entry_id。
任务是从class_id中取出rider_count并将其分解，这样我们每次热力赛最多只能有7名骑手，并且可以将骑手均匀地分配给每个热量。
查找是我们如何确定分布如何发生的。那部分看起来很完美。我只是坚持如何让每个骑手被分配到一个位置。
我尝试了几种不同的方法，这就像我得到的答案一样接近。
非常感谢正确方向的推动！
在此处查看我目前的输出结果：
http://home.garyeterry.com/midam/createheats.php?event_id=113
由于
表格结构：
CREATE TABLE IF NOT EXISTS `tbl_event_entries` (
`entry_id` int(11) NOT NULL AUTO_INCREMENT,
`event_id` int(1) DEFAULT NULL,
`racer_id` int(4) DEFAULT NULL,
`class_id` int(1) DEFAULT NULL,
`racing_nbr` varchar(4) DEFAULT NULL,
`machine_cc` int(2) DEFAULT NULL,
`brand_id` int(1) DEFAULT NULL,
`overall_finish` int(1) DEFAULT NULL,
`xtra_int1` varchar(10) DEFAULT NULL,
`heat_nbr` int(1) DEFAULT NULL,
`heat_position` int(1) DEFAULT NULL,
`heat_row` int(1) DEFAULT NULL,
`heat_finish` int(1) DEFAULT NULL,
PRIMARY KEY (`entry_id`),
UNIQUE KEY `entry_id` (`entry_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=165 ;
答案 0 :(得分：1)
尽我所能清理，可能不完美，但应该足以在正确的方向上轻推。
将lookup类移至数据库表
在我看来，在这里将lookup类的意图移动到数据库表中会更好。想象一下这样的事情：
CREATE TABLE IF NOT EXISTS `tbl_lookup` (
`lookup_id` int(11) NOT NULL AUTO_INCREMENT,
`rider_count` int NOT NULL,
`heat_count` int NOT NULL,
`riders_in_heat_1` int NOT NULL,
`riders_in_heat_2` int,
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
然后插入lookup类的所有数据。
使用JOIN＆amp;第一个SQL查询中的GROUP BY
您需要确定特定事件和班级中的骑手数量。您可以加入tbl_event_classes和tbl_event_entries，然后GROUP BY tbl_event_entries.event_id来获取这些数量。
SELECT tec.class_id, tec.event_id, COUNT(tee.event_id) AS entries_per_class
FROM tbl_event_classes tec
JOIN tbl_event_entries tee ON tee.event_id = tec.event_id
WHERE tec.event_id = :event_id
GROUP BY tee.event_id
清理PHP
现在您的PHP代码应该更容易理解。一个主要查询，用于获取每个类每个事件的骑手数量的事件和类。然后，当您遍历该结果集时，确定每次加热的骑手数量。
这有点粗糙，但我相信你可以从这里打磨它。
function getEntriesPerClass($event_id) {
global $db;
$stmt = $db->prepare(
'SELECT tec.class_id, tec.event_id, COUNT(tee.event_id) AS entries_per_class ' .
'FROM tbl_event_classes tec ' .
'JOIN tbl_event_entries tee ON tee.event_id = tec.event_id ' .
'WHERE tec.event_id = :event_id ' .
'GROUP BY tee.event_id');
$stmt->bindValue(':event_id', $event_id);
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_ASSOC);
}
function getRidersInHeats($class_id, $event_id, $riders_per_class)
{
global $db;
$stmt = $db->prepare(
'SELECT tl.riders_in_heat_1, tl.riders_in_heat_2 ' .
'FROM tbl_lookup ' .
'WHERE class_id = :class_id AND event_id = :event_id AND rider_count = :entries');
$stmt->bindValue(':class_id', $class_id);
$stmt->bindValue(':event_id', $event_id);
$stmt->bindValue(':rider_count', $riders_per_class);
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_ASSOC);
}
$entriesPerClass = getEntriesPerClass($_GET['event_id']);
foreach($entriesPerClass as $entry) {
$riders = getRidersInHeats($entry['class_id'], $entry['event_id'], $entry['entries_per_class']);
echo
"class : " . $row['class_id'] . "; " .
"ridercount: " . $riders['rider_count'] . "; " .
"heats : " . $riders['heat_count'] . "<br/>";
echo "Heats, consisting of :<br>\n<ul>";
echo "<li>Heat 1: " . $riders['riders_in_heat_1'] . "</li>";
$ridersInHeat2 = $riders['riders_in_heat_2'];
if($ridersInHeat2 > 0) {
echo "<li>Heat 2: " . $riders['riders_in_heat_2'] . "</li>";
}
echo "</ul>";
}
答案 1 :(得分：1)
我今天早上一直坚持这一点，知道循环是我的问题，并且知道我接近我需要的东西。在我的主循环中对$ offset进行了一点按摩，并且正如我需要它一样工作。 ;）
再次感谢那些提供帮助的人。以下是有效的代码。
<?php
session_start();
require_once "../db.class.php";
require_once "../functions.class.php";
$f = new functions();
$event_id = $_POST['id'];
header("Content-Type:application/json; Charset=utf-8");
// -- Function Name : getLookup
// -- Params : $value
// -- Purpose : get count of riders and return distribution of riders and heats
function getLookup($value)
{
global $db;
$stmt = $db->prepare("SELECT * FROM tbl_lookup WHERE rider_count = :value");
$stmt->bindValue(':value', $value);
$stmt->execute();
return $r = $stmt->fetchAll(PDO::FETCH_ASSOC);
}
// -- Function Name : getEntries
// get entries for the event
// -- Purpose : get entries to determine race orders
function getEntries($class_id, $limit, $offset)
{
global $db;
global $event_id;
$getentries = $db->prepare("SELECT entry_id FROM tbl_event_entries WHERE event_id = :event_id AND class_id = :class_id LIMIT :offset, :limit");
$getentries->bindValue(':event_id', $event_id);
$getentries->bindValue(':class_id', $class_id);
$getentries->bindValue(':limit', $limit);
$getentries->bindValue(':offset', $offset);
$getentries->execute();
while ($r = $getentries->fetch(PDO::FETCH_ASSOC)) return $r['entry_id'];
}
// -- Function Name : getEntriesPerClass
// get count of entries per class
// -- Purpose : get entries per class to feed the lookup function
function getEntriesPerClass ()
{
global $db;
$getentriesperclass = $db->prepare("SELECT tbl_event_entries.class_id, COUNT(tbl_event_entries.entry_id) AS riders, tbl_moto_order.moto_nbr
FROM tbl_event_entries
JOIN tbl_moto_order ON tbl_event_entries.event_id = tbl_moto_order.event_id AND tbl_event_entries.class_id = tbl_moto_order.class_id
WHERE tbl_event_entries.event_id = :event_id
GROUP BY tbl_event_entries.class_id
ORDER BY moto_nbr;");
$getentriesperclass->bindValue(':event_id', $_POST['id']);
$getentriesperclass->execute();
$counts = array();
while ($r = $getentriesperclass->fetch(PDO::FETCH_ASSOC)) $counts[$r['class_id']] = $r['riders'];
return $counts;
}
$counts = getEntriesPerClass();
$race = 1; //set to add value to race_nbr field, increments 1 time for each total heat race
foreach ($counts as $class => $rider_count)
{
$list = getLookup($rider_count); // lookup to get heat race counts and line ups for each heat.
// update event classes table with counts so we don't have to loop like crazy to build the printouts
$assign_class_counts = $db->prepare("UPDATE tbl_event_classes SET nbr_of_heats = :nbr_of_heats, nbr_of_riders_in_heats = :nbr_of_riders_in_heats WHERE event_id = :event_id AND class_id = :class_id");
$assign_class_counts->bindValue(':nbr_of_heats', $list[0]['heat_count']);
$assign_class_counts->bindValue(':nbr_of_riders_in_heats', $list[0]['rider_count']);
$assign_class_counts->bindValue(':event_id', $_POST['id']);
$assign_class_counts->bindValue(':class_id', $class);
$assign_class_counts->execute();
$offset = 0; // set offset to feet the main query to give us the position in each heat for a rider. Used in the getEntries query.
for ($i = 1; $i <= $list[0]['heat_count']; $i++)
{
if ($list[0]['heat_count'] > 0)
{
for ($rih = 1; $rih <= $list[0]['riders_in_heat_'.$i]; $rih++)
{
$assignheats = $db->prepare("UPDATE tbl_event_entries SET heat_nbr = :heat_nbr, heat_position = :heat_position, race_nbr = :race_nbr WHERE entry_id = :entry_id");
$assignheats->bindValue(':heat_nbr', $i);
$assignheats->bindValue(':heat_position', $rih);
$assignheats->bindValue(':race_nbr', $race);
$assignheats->bindValue(':entry_id', getEntries($class, $list[0]['riders_in_heat_'.$i], $offset));
$assignheats->execute();
$offset++;
}
$race++;
}
}
}
echo json_encode(array('status' => true));