Question

我在SQL数据库上有2个请求。加载整个脚本/页面需要很长时间。有更好（更快）的方式吗？我的代码看起来像这样

.state('error', {
  url: "/page-not-found",
  templateUrl: "templates/error.html",
  controller: "errorController"
})

我有一个围绕回声数据的表。如果有人能给我一个小费，我会很棒。

Answer 1

首先，如果表格有关系，我建议您使用join一次调用数据。

SELECT * FROM table_a a
LEFT JOIN tabl_b b ON a.user_name = b.user_name
WHERE a.state = '0'

第二，为了加速你可以将INDEX放在WHERE子句中使用的两个字段上的东西 - state，user_name

ALTER TABLE `table_a` ADD INDEX `state` (`state`)
ALTER TABLE `tabl_b` ADD INDEX `user_name` (`user_name`)

Answer 2

当涉及加载时间时，我们应该只从表中获取所需的那些列，因此在第一个查询中我们可以获取user_name，ID，company，PL_read，PL_total，country，EDIT
< / LI>

由于在循环内运行的查询也需要时间，所以要避免在代码下面使用

    $dataArray = array();
    $userName = NULL;
    $abfrage = "SELECT ID, user_name, company, PL_read, PL_total, country, EDIT FROM table_a WHERE state = '0' ORDER BY EDIT DESC";
    $stmt = $pdo->query($abfrage);

    foreach($stmt as $data) {
        //creating a string
        if (is_null($userName))
        {
            $userName = "'" . $data['user_name'] . "'";
        }
        else
        {
            $userName .= ",'" . $data['user_name'] . "'";
        }
        $dataArray[$userName] = $data;
    }

    $stmt = $pdo->query("SELECT follower, user_name FROM tabl_b WHERE      user_name IN ($userName) ORDER BY follower");

    foreach($stmt as $data) { 
        if(isset($dataArray[$userName]))
        {
            $dataArray[$userName]['follower'] = $data['follower'];
        }
        else
        {
            $dataArray[$userName]['follower'] = 'N/A';
        }
    }

    foreach($dataArray as $data) { 
            echo $data['ID'];?>
            <?php echo $data['ID'];?>

            <?php if ($data['company'] == '') { ?>
                <a href="https://open.spotify.com/user/<?php echo $data['user_name'];?>" target="_blank"><?php if ($data['state'] == '3') { echo "<span style=\"color:#0000FF\";>".$data['user_name']."</span>"; } else { echo $data['user_name'];}?></a>
            <?php } else {?>
                <a href="https://open.spotify.com/user/<?php echo $data['user_name'];?>" target="_blank"><?php if ($data['state'] == '3') { echo "<span style=\"color:#0000FF\";>".$data['company']."</span>"; } else { echo $data['company'];}?></a>

            <?php } ?>

            <?php echo $data['PL_read'];?>
            <?php echo $data['PL_total'];?>
            <?php echo $data['country'];?>
            <?php echo $data['EDIT'];?>
            <?php echo $pl['follower'];?>
 <?php } ?>

PHP SQL / multible select request / slow

2 个答案: