PHP代码:
<?php
//DB CONNECTION
//---(1)Get skillname---
$q = "SELECT skillName FROM skill ORDER BY skillName asc";
$r = mysqli_query($dbc, $q);
$num_rows = mysqli_num_rows($r);
while($row = mysqli_fetch_array($r, MYSQLI_ASSOC))
{
$skills[] = $row['skillName'];
}
//---(2)Get classname---
$q1 = "SELECT className FROM class";
$r1 = mysqli_query($dbc, $q1);
$num_rows1 = mysqli_num_rows($r1);
while($row1 = mysqli_fetch_array($r1, MYSQLI_ASSOC))
{
$className[] = $row1['className'];
}
//---(3)Create table---
echo '<table border="1" style="border-collapse: collapse; text-align: center">';
echo '<tr>';
for($a = 0; $a < $num_rows; $a++)
{
echo '<th colspan="2">'.$skillName[$a].'</th>';
}
echo '</tr>';
for($b = 0; $b < $num_rows; $b++)
{
echo '<th>Student Name</th>';
echo '<th>Grade</th>';
}
echo '</tr>';
//---(4)Get student name and grade---
for($s = 0; $c < $num_rows1; $c++)
{
$q2 = "SELECT GROUP_CONCAT(sm.studentName) as studentName,
GROUP_CONCAT(sm.studentGrade) as studentGrade,
s.skillName
FROM studentmark sm
LEFT JOIN skill s ON sm.skillID = s.skillID
WHERE sm.className = '".$className[$c]."'
GROUP BY s.skillID";
$r2 = mysqli_query($dbc, $q2);
$num_rows2 = mysqli_num_rows($r2);
$value = array();
while($row2 = mysqli_fetch_array($r2, MYSQLI_ASSOC))
{
$value[] = $row2;
}
echo '<tr>';
for($d = 0; $d < $num_rows2; $d++)
{
echo '<td>'.$value[$d]['studentName'].'</td>';
echo '<td>'.$value[$d]['studentGrade'].'</td>';
}
echo '</tr>';
}
echo '</table>';
?>
从上面的代码中,我的输出如下:
我差不多完成了。我可以在一行中显示学生姓名和成绩。
现在,我要做的最后一件事是将它们放入合适的技能名称中,如下所示:
我想比较$skills
上的s.skillname
和$q2
。
以下是我的逻辑:
if($value[X]['skillName'] == $skills[X])
{
//put student name and grade inside
}
else
{
//empty cell
}
但我不知道我应该在哪里打开循环并将我的逻辑放入(4)。有人能帮助我吗?
答案 0 :(得分:1)
在您的设计中,直到第4步的最后一个循环,您做得很好(尽管可以优化)。
您遇到的问题是,您有一组结果代表其中的每个类的行。现在你需要将它们分散到技能表中,重要的是,不要留下垂直间隙。
解决方案是在内存中的二维数组中进行,然后从中创建表 - 因为内存中的每个单元都可以轻松地与html表中的单元格进行寻址。
内存表将是这样的:
|Skill 1 | Skill 2 | Skill3|
|stdnt 1 |stdnt 2,3|stdnt 4|
| | |stdnt 5|
请注意我是如何使用array_search
获取特定技能的索引并在array_push
中将其用于将学生插入正确的子阵列。然后我把它翻译成HTML表格
我用以下代码替换你的上一个循环:
//This is our memory table. Let's create it and add number of child arrays
//equal to number of skills.
$memTable = array();
for ($i = 0; $i <= sizeOf($skills) - 1; $i++) {
$memTable[$i] = array();
}
//Lets spread out your student information in to this 2d array now
foreach ($value as $student) {
//Get the index of the skill
$skillIndex = array_search($student['skillName'], $skills);
//Now go to appropriate child array and insert your student there
array_push($memTable[$skillIndex], $student);
};
//Lets create the table now
$emptyCount = 0;
$currentRow = 0;
//Do until all the skill arrays are empty for a row
while ($emptyCount < 3) {
echo "<tr>";
$emptyCount = 0;
foreach ($memTable as $skillLevel) {
if (sizeof($skillLevel) - 1 < $currentRow) {
$emptyCount ++;
echo "<td> </td>";
echo "<td> </td>";
}
else {
echo "<td>" . $skillLevel[$currentRow]['studentGrade'] . "</td>";
echo "<td>" . $skillLevel[$currentRow]['studentGrade'] . "</td>";
}
}
$currentRow++;
echo "</tr>";
};
请注意,技能将根据$ skills数组中的顺序呈现在表格中。如果您有任何不清楚的地方,请向我提问。您可能需要调整一些字符串名称以采用您的代码。
更新
while($ emptyCount&lt; sizeof($ skills))更准确。
答案 1 :(得分:1)
因此,为了不多次循环数据,我确实搞乱了你干净利落的代码。我还显示了类似名称的原因,这似乎是有用的信息。
我更改了一些变量名称,因为我发现更容易记住每个变量的用途。另外,请注意学生信息查询仅执行一次。 Normaly(读:我不能想到你不会,但我不是CMA),你想减少查询数据库的次数
以下代码将替换您发布的整个脚本。
<?php
//DB CONNECTION
$dbc = // magic connection sauce you already have
// get skills and stash how many there are
$q_class = "SELECT skillName FROM skill ORDER BY skillName asc";
$r_class = mysqli_query($dbc, $q_class);
$num_skills = mysqli_num_rows($r_class);
// start table code so that we can echo the skillname headers
echo '
<table border="1" style="border-collapse: collapse; text-align: center">
<thead>
<tr>
<th rowspan=2>Classes</th>';//header for class name column
$header = array();
while($row = mysqli_fetch_array($r_class, MYSQLI_ASSOC))
{
$skills[] = $row['skillName'];
// store both thead rows at the same time so that we can echo them out properly later
$header['first'][] = '
<th colspan="2">' . $row['skillName'] . '</th>';
$header['second'][] = '
<th>Student Name</th>
<th>Grade</th>';
}
echo '
' . implode($header['first']) . '
</tr>
<tr>' . implode($header['second']) . '
</tr>';
// clean-up
mysqli_free_result($r_class);
// get class names and stash how many there are
$classes = array();
$query_class = "SELECT className FROM class";
$r_class = mysqli_query($dbc, $query_class);
$num_classes = mysqli_num_rows($r_class);
while($row = mysqli_fetch_array($r_class, MYSQLI_ASSOC))
{
$classes[] = $row['className'];
}
// clean-up
mysqli_free_result($r_class);
echo '
</thead>
<tbody>';
// pull query out of loop so that you'll only have to execute it once.
$studentInfoQuery = "
SELECT
GROUP_CONCAT(sm.studentName) as studentName,
GROUP_CONCAT(sm.studentGrade) as studentGrade,
s.skillName,
sm.className
FROM studentmark sm
LEFT JOIN skill s ON sm.skillID = s.skillID
GROUP BY sm.className,s.skillID";
$r_students = mysqli_query($dbc,$studentInfoQuery);
$num_studentRows = mysqli_num_rows($r_students);
$studentRows = array();
while($row = mysqli_fetch_array($r_students, MYSQLI_ASSOC)) {
// with our query, we only find 1 cell-pair per skill per class
$studentRows[$row['skillName']][$row['className']] = '
<td>' . $row['studentName'] . '</td>
<td>' . $row['studentGrade'] . '</td>';
}
// everybody do their share! // actually, more clean-up
mysqli_free_result($r_students);
for($j = 0; $j < $num_classes; $j++) {
echo "
<tr>
<th>" . $classes[$j] . "</th>";
for($i = 0; $i < $num_skills; $i++) {
// always echo out a cell, even if we have student info for it
// example: if(isset($studentRows['Listening']['1A'])) echo it out else echo cell
if(isset($studentRows[$skills[$i]][$classes[$j]]))
echo $studentRows[$skills[$i]][$classes[$j]];
else
echo "
<td colspan=2>No skill-class-student value</td>";
}
echo "
</tr>";
}
echo '
</tbody>
</table>';
?>
结果: