我如何在获取 assoc 时制作表格

Posted 2023-05-09

【中文标题】我如何在获取 assoc 时制作表格

【英文标题】：How can i make a table while fetch assoc

【发布时间】：2015-10-28 10:35:41

【问题描述】：

您好，我是（开始）php 后端开发人员，我正在开发 dj 面板，但它不能以正确的方式工作，我尝试了尽可能多的东西，但我无法让它工作..

    $active_ids = '1, 3, 4';

    $query = "SELECT * FROM users WHERE id IN ($active_ids)";
    $result = $mysqli->query($query);   

    $query2 = "SELECT dj, count(*) AS n FROM timetable WHERE dj IN ($active_ids) GROUP BY dj";
    $result2 = $mysqli->query($query2);

        if ($result->num_rows > 0) 
            while($row = $result->fetch_assoc())
                echo "<tr>";
                echo "<td>", $row['username'] ,"</td>";
            

            if ($result2->num_rows > 0) 
                while($row2 = $result2->fetch_assoc())
                echo "<td>", $row2['n'] ,"</td>";
                echo "</tr>";
                
            
        

这就是它所显示的

ZOMBOY
Hater
ZOMBOY2 3
1
1

这就是它需要变成的样子，但我找不到办法做到这一点

ZOMBOY    3
Hater     1
ZOMBOY2   1

【问题讨论】：

您需要进行join 查询才能显示结果。

它被分组了，所以我不知道如何正确地做到这一点@Kamran

【参考方案1】：

您可以使用join 代替查询两个表

$active_ids = '1, 3, 4';

$query = "SELECT u.username, count(*) AS n FROM users u, timetable tt WHERE u.id=tt.dj and u.id IN ($active_ids) GROUP BY tt.dj";
$result = $mysqli->query($query);

if ($result->num_rows > 0) 
    while($row = $result->fetch_assoc())
        echo "<tr>";
        echo "<td>", $row['username'] ,"</td>";
        echo "<td>", $row['n'] ,"</td>";
        echo "</tr>";
    

【参考方案2】：

你可以这样做，但必须看Joins

$active_ids = '1, 3, 4';

$query = "SELECT * FROM users WHERE id IN ($active_ids)";
$result = $mysqli->query($query);   

$query2 = "SELECT dj, count(*) AS n FROM timetable WHERE dj IN ($active_ids) GROUP BY dj";
$result2 = $mysqli->query($query2);
$columnOne = Array();
$columnTwo = Array();
if ($result->num_rows > 0) 
    while($row = $result->fetch_assoc())
        $columnOne[]= $row['username'];
    

    if ($result2->num_rows > 0) 
        while($row2 = $result2->fetch_assoc())
            $columnTwo[] = row2['n'];
        
    

echo '<table>';
for($i=0;$i<count($columnOne);$i++)
    echo '<tr><td>' . $columnOne[$i] . '</td><td>' . $columnTwo[$i] . '</td></tr>';

echo '</table>';

【讨论】：

我说它是分组的，所以我不知道如何正确加入它

在页面源中有, 第二个问题是查询返回任何结果测试数组print_r ($columnOne);print_r ($columnTwo);它 echo 的 array() array()

【参考方案3】：

你可以尝试这样的事情（不像其他人那么优雅）：

# Escape your characters
$active_ids = "'1', '3', '4'";

# Tidy up the querys to reduce the change of reserved words being used
$query = "SELECT * FROM `users` WHERE `id` IN ($active_ids);";
$result = $mysqli->query($query);   
$query2 = "SELECT `dj`, COUNT(*) AS n FROM `timetable` WHERE `dj` IN ($active_ids) GROUP BY `dj`";
$result2 = $mysqli->query($query2);

# Count your results
$c1 = count($result); 
$c2 = count($result2);
#Set the counter to be the larger of the 2
$counter = (($c1 > $c2) ? $c1 : $c2);
if ($result->num_rows > 0 && $result2->num_rows > 0)

    # Print the table opener
    print '<table class="your_class">';
    # Loop through your results
    for ($i = 0; $i < $counter; $i++)
    
        # Print the data needed
        print '<tr><td>' . $result[$i]['username'] . '</td><td>' . $result2[$i]['n'] . '</td></tr>';
    
    # End the table
    print '</table>';