如何在PHP中防止另一个foreach循环中的foreach循环重复？

我有一个音乐网站，每当用户点击play，我的PHP函数就会插入到表视图中

我试图对MySQL数据库进行重新排序，以优化其性能，因此在本例中，我尝试统计按时间分组的每个曲目的总视图

仅选择表视图中的轨迹：

$query的结果是：

将每个结果的行数计算为播放和按日期分组：

$querysel = $this->db->query(sprintf("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` WHERE `track` = '%s' GROUP BY DATE( `time` )", $tid)); 

$querysel的结果

最后在新表中插入结果：

$this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $newtid, $plays, $time));

以下是我的完整功能：

function countViews() {

    $query = "SELECT  `track` FROM  `views` GROUP BY `track`";
    $result = $this->db->query($query);

    while($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }

    foreach($rows as $row) {
        $tid = $row['track'];

        $querysel = $this->db->query(sprintf("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` WHERE `track` = '%s' GROUP BY DATE( `time` )", $tid)); 

        while($rownew = $querysel->fetch_assoc()) {
            $rowsnew[] = $rownew;
        }

        foreach($rowsnew as $rownew) {

            $newtid = $rownew['track'];
            $plays = $rownew['plays'];
            $time = $rownew['time'];

            $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $newtid, $plays, $time));

        }

    }

}

<?php
    include("/var/www/html/includes/config.php");
    include("/var/www/html/includes/classes.php");
    session_start();
    $db = new mysqli($CONF['host'], $CONF['user'], $CONF['pass'], $CONF['name']);
    if ($db->connect_errno) {
        echo "Failed to connect to MySQL: (" . $db->connect_errno . ") " . $db->connect_error;
    }
    $db->set_charset("utf8");

    $feed = new feed();
    $feed->db = $db;                
    $result = $feed->countViews();

    mysqli_close($db);
?>

在我的函数中，我使用GROUP BY DATEtime，那么为什么插入到新表视图中的最终查询会同时统计重复项呢

以下是我的输出：

正如你看到的，我在同一时间有多个相同的结果

以下是我的预期：

id  | tid | plays | time
----|-----|-------|--------------
1   | 1   | 2     | 2017-01-26 12:43:16
2   | 1   | 1     | 2017-01-27 12:45:24
3   | 3   | 30    | 2016-12-26 18:20:16

更新

下面是我如何调用此一次性函数的：

function countViews() {

    $query = "SELECT  `track` FROM  `views` GROUP BY `track`";
    $result = $this->db->query($query);

    while($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }

    foreach($rows as $row) {
        $tid = $row['track'];

        $querysel = $this->db->query(sprintf("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` WHERE `track` = '%s' GROUP BY DATE( `time` )", $tid)); 

        while($rownew = $querysel->fetch_assoc()) {
            $rowsnew[] = $rownew;
        }

        foreach($rowsnew as $rownew) {

            $newtid = $rownew['track'];
            $plays = $rownew['plays'];
            $time = $rownew['time'];

            $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $newtid, $plays, $time));

        }

    }

}

<?php
    include("/var/www/html/includes/config.php");
    include("/var/www/html/includes/classes.php");
    session_start();
    $db = new mysqli($CONF['host'], $CONF['user'], $CONF['pass'], $CONF['name']);
    if ($db->connect_errno) {
        echo "Failed to connect to MySQL: (" . $db->connect_errno . ") " . $db->connect_error;
    }
    $db->set_charset("utf8");

    $feed = new feed();
    $feed->db = $db;                
    $result = $feed->countViews();

    mysqli_close($db);
?>

countViews函数位于classes.php内部

我称之为PHP，只是为了通过web访问请求的页面。

尝试以下方法：

function countViews() {

    $query = "SELECT  `track` FROM  `views` GROUP BY `track`";
    $result = $this->db->query($query);

    while($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }

    $rowsnew = array();

    foreach($rows as $row) {
        $tid = $row['track'];

        $querysel = $this->db->query(sprintf("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` WHERE `track` = '%s' GROUP BY DATE( `time` )", $tid)); 

        while($rownew = $querysel->fetch_assoc()) {
            $rowsnew[] = $rownew;
        }

    }

    foreach($rowsnew as $rownew1) {

        $newtid = $rownew1['track'];
        $plays = $rownew1['plays'];
        $time = $rownew1['time'];

        $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $newtid, $plays, $time));

    }

}

好的，所以只有一个SELECT查询就足够了，如下所示：

$query = "SELECT `track`, `time`, COUNT(*) AS `plays` FROM `views` 
                 GROUP BY `track`, DATE(`time`) 
                 ORDER BY `track`, DATE(`time`);"

$result = $this->db->query($query);

while($row = $result->fetch_assoc()) {
    $newtid  =  $row['track'];
    $plays   =  $row['plays'];
    $time    =  $row['time'];

    $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) 
                                     VALUES ('%s','%s','%s')", 
                                     $newtid, $plays, $time));

}

理想情况下，这应该能达到目的。使用手动创建的示例数据的简单查询演示：

create table views (track int, `time` timestamp);
insert into views VALUES(1, '2017-01-26 12:43:16');
insert into views VALUES(1, '2017-01-27 12:45:24');
insert into views VALUES(1, '2017-01-27 12:50:30');

insert into views VALUES(2, '2017-01-25 01:00:00');
insert into views VALUES(2, '2017-01-25 02:00:00');
insert into views VALUES(2, '2017-01-26 11:30:00');
insert into views VALUES(2, '2017-01-26 11:45:00');
insert into views VALUES(2, '2017-01-26 13:45:00');
insert into views VALUES(2, '2017-01-26 15:45:00');
insert into views VALUES(2, '2017-01-27 08:00:00');

insert into views VALUES(3, '2017-01-27 09:00:00');


SELECT `track`, `time`, COUNT(*) AS plays FROM views 
GROUP BY `track`, DATE(`time`) ORDER BY `track`, DATE(`time`);

使用此查询生成的输出，即预期在视图中到达的值。\u计数：

---

希望这有助于……

我建议只使用一个查询来解决您的问题

function countViews() {
    $query = $this->db->query("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` GROUP BY `track`,DATE( `time` );"); 
    while($row = $query->fetch_assoc()) {
        $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $row['track'], $row['plays'], $row['time']));
    }
}

真的不能在一个查询中完成吗

INSERT INTO views_counts (tid, time, plays)
    SELECT       track, DATE(`time`), COUNT(*)
        FROM `views`
        GROUP BY track, DATE(`time`)

请注意，要插入的行来自SELECT

---

我自由地使用了DATEtime，否则，选择的时间是任意的。

@RiggsFolly正如我所说，这只是一个一次性函数，我不需要每天运行该函数……当我运行该函数时，表视图计数为空。如果一切正常，我在这里做什么。。。。是的，每个组有一行。也许您没有显示毫秒的时间，请发布示例行和文本。也试着显示预期的输出，而不是你得到的。请两者都作为文本。您的$rowsnew[]随着每个循环而增长-在第二次提取之前或插入循环之后重置它。如果sql_dru的答案真的是一次性的，那么它也应该起作用。

track  |  time                |    plays   
----------------------------------------------
1      |  2017-01-26 12:43:16 |    1
1      |  2017-01-27 12:45:24 |    2
2      |  2017-01-25 01:00:00 |    2
2      |  2017-01-26 11:30:00 |    4
2      |  2017-01-27 08:00:00 |    1
3      |  2017-01-27 09:00:00 |    1

function countViews() {
    $query = $this->db->query("SELECT COUNT( * ) AS plays , `time`, `track` FROM `views` GROUP BY `track`,DATE( `time` );"); 
    while($row = $query->fetch_assoc()) {
        $this->db->query(sprintf("INSERT INTO views_counts (tid,plays,time) VALUES ('%s','%s','%s')", $row['track'], $row['plays'], $row['time']));
    }
}

INSERT INTO views_counts (tid, time, plays)
    SELECT       track, DATE(`time`), COUNT(*)
        FROM `views`
        GROUP BY track, DATE(`time`)