Mysql 从数据库中选择

Question

我是这方面的新手，我只是在学习。我为 NHL 锦标赛制作了一个页面，现在我想缩短我的 php 代码，但实际上我不知道该怎么做。

我的问题是从数据库中进行选择。做的很复杂，但也许有办法让它更短？

<?php
    if( IS_USER ){
$team = mysql::fetch(mysql::query( 1 , "SELECT * FROM league_nhl_standings WHERE league_id = '".get_seg('ceturtais')."' AND player_id = '" . get_cookie('user_id') . "'"));
$center = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'C'")); 
$defenseman = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'D'")); 
$goalies = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'GK'")); 
$leftw = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'LW'")); 
$rightw = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'RW'"));

Answer 1

您可以在一个查询中合并以下查询。

$center = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'C'")); 
$defenseman = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'D'")); 
$goalies = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'GK'")); 
$leftw = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'LW'")); 
$rightw = mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position = 'RW'"));

喜欢这个，

$allplayers=mysql::rows(mysql::query(1,"SELECT * FROM player_list WHERE team = '$team[team_small]' AND position IN ('C', 'D', 'GK', 'LW', 'RW')"));

现在您可以迭代 $allplayers 并通过将 position 列与简单的 PHP if 条件进行比较来循环过滤结果集。

这将减少您对数据库的查询量，并在 PHP 脚本上回复 filter/get 适当的数据。

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