Question

我有一个分为不同部分的网页。每个部分都必须显示不同的结果。这些结果来自数据库。这是关于SQLfiddle的示例数据

以下代码是我想到的，但我担心当不同的人多次访问此页面时，它可能会以某种方式使服务器超载

$sectionA = $connect->query("SELECT * FROM Main_Section WHERE section = `A` 
"); 
while ($row = $sectionA->fetch_array(MYSQLI_BOTH))
{
    $id = $row["id"];
    $name = $row["name"];
    $sec_result_a = $sec_result_a.'<p>'.$id.'</p><h3>'.$name.'</h3>';
}

$sectionB = $connect->query("SELECT * FROM Main_Section WHERE section = `B` "); 
while ($row = $sectionB->fetch_array(MYSQLI_BOTH))
{
    $id = $row["id"];
    $name = $row["name"];
    $sec_result_b = $sec_result_b.'<p>'.$id.'</p><h3>'.$name.'</h3>';
}

$sectionC = $connect->query("SELECT * FROM Main_Section WHERE section = `C` "); 
while ($row = $sectionC->fetch_array(MYSQLI_BOTH))
{
    $id = $row["id"];
    $name = $row["name"];
    $sec_result_c= $sec_result_c.'<p>'.$id.'</p><h3>'.$name.'</h3>';
}

UP to section Z

有没有办法可以正确地优化它？

Answer 1

除非图片中有更多内容，为什么不查询按部分排序的所有内容，以获得A-Z：

SELECT * FROM Main_Section ORDER BY section

...然后用一个循环处理结果，看起来像这样：

$sections = $connect->query("SELECT * FROM Main_Section ORDER BY section"); 

while ($row = $sections->fetch_array())
{
    echo $row['section'] . ' ' . '<p>' . $row['id'] . '</p><h3>' . $row['firstname'] . ' ' . $row['lastname'] . '</h3>'; 
}

如何正确优化mysql select语句

1 个答案: