编辑：

Question

所以，我使用该代码从MySQL获取一些数据：

<?
$query=mysql_query("SELECT date,COUNT(*) as num FROM downloads WHERE prjID='".$_GET['id']."' GROUP BY date ORDER BY date ASC");
$num=mysql_num_rows($query);
$res='';
$i=0;
while($row=mysql_fetch_array($query)){

$i++;
$date=date("d.m.Y", strtotime($row['date']));

$dan=date("d", strtotime($row['date']));
$mesec=date("m", strtotime($row['date']));
$leto=date("Y", strtotime($row['date']));

if($i=1){
$danPrvi=$leto.", ".($mesec-1).", ".$dan;
$dan1=date("d", strtotime(time()));
$mesec1=date("m", strtotime(time()));
$leto1=date("Y", strtotime(time()));
$danZadnji=$leto1.", ".($mesec1-1).", ".$dan1;
}

$numb=1;

if($row['num']!=1){
$res.="[Date.UTC(".$leto.",".($mesec-1).",".$dan."),".$row['num']."], ";
}
else{
if($i!=$num){
$res.="[Date.UTC(".$leto.",".($mesec-1).",".$dan."),".$numb."], ";
}
else{
$res.="[Date.UTC(".$leto.",".($mesec-1).",".$dan."),".$numb."]";
}
}
}
?>

我得到的结果是：

1.3.2013 - 1
6.3.2013 - 5

但我希望得到这样的结果：

1.3.2013 - 1
2.3.2013 - 0
3.3.2013 - 0
4.3.2013 - 0
5.3.2013 - 0
6.3.2013 - 1

我也在使用Highcharts，因此日期值必须格式化为Date.UTC（年，月-1，日）

编辑：

我的数据库中没有所有日期。在我的考试中，只有1.3.2013和6.3.2013，那么我如何检测并设置0之间的所有日期的值，没有值> = 1？

Answer 1

我想你需要做的是设置一个构造来保存你感兴趣的日期，并在查询中使用它或者后处理查询数据。例如：

<?php
$query=mysql_query("SELECT date,COUNT(*) as num FROM downloads WHERE prjID='".$_GET['id']."' GROUP BY date ORDER BY date ASC");
$num=mysql_num_rows($query);

// Get the first and last dates in the result set
$firstRow = mysql_result($query, 0);
$lastRow = mysql_result($query, $num-1);

// Now make thos the begin and end dates
$beginDate = new DateTime(strtotime($firstRow['date']));
$endDate = new DateTime(strtotime($lastRow['date']));
$currentDate = $beginDate;
$interestingDates = array();

// Populate our interestingDates array with all counts set to 0
while ($currentDate <= $endDate){
    $interestingDates[$currentDate->format('d.m.Y')] = 0;
    $currentDate->add(new DateInterval('P1D'));
}

// Reset the data result for looping over
mysql_data_seek($query,0);
while($row=mysql_fetch_array($query)){
    // Go ahead and format the string
    $formatedString = date("d.m.Y", strtotime($row['date']));

    // If the string is in our interestingDates array, update the count
    if (array_key_exists($formatedString, $interestingDates)){
        $interestingDates[$formatedString] = $row['num'];
    }
}

// Print it out
foreach ($interestingDates as $key=>$value){
    print "$key - $value\n";
}

注1： mysql_query 自PHP 5.5.0起不推荐使用，将来也会被删除。 Pleasue使用其他API - 我建议 pdo_mysql。

注2： 当前查询未参数化。使用PDO，这可能看起来像：

$sth = $dbh->prepare('SELECT date,COUNT(*) as num FROM downloads WHERE prjID= :prjID GROUP BY date ORDER BY date ASC');
$sth->bindParam(':prjID', $_GET['id'], PDO::PARAM_INT);
$sth->execute();

免责声明 - 我实际上并没有运行此代码，我只是把它写在了我的头顶。您可能需要测试/调试它。

Answer 2

假设您拥有所有日期的数据，而不是特定的ID，您可以做一个条件总和：

SELECT date, sum(case when prjID='".$_GET['id']."' then 1 else 0 end) as num
FROM downloads
GROUP BY date
ORDER BY date ASC

Answer 3

警告！在SQL中执行此操作是一种非常糟糕的方式，但如果您愿意 - 您可以：）

http://sqlfiddle.com/#!2/b491a/1/0

SELECT dynamic_date AS date, COUNT(downloads.date) AS num FROM ( SELECT DATE_ADD(start, INTERVAL i - 1 DAY) AS dynamic_date, prjID FROM ( SELECT @i := @i + 1 AS i FROM (SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t1, (SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t2, (SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9) t3, (SELECT @i:=0) init ) i_sequence, (SELECT MIN(date) start, MAX(date) finish, prjID FROM downloads WHERE prjID=5 GROUP BY prjID) minmax WHERE DATE_ADD(start, INTERVAL i - 1 DAY) <= finish ) date_sequence LEFT JOIN downloads ON dynamic_date = downloads.date and downloads.prjID=date_sequence.prjID GROUP BY dynamic_date ;

将空值设置为不在MySQL中的日期

编辑：

3 个答案: