如何创建这样的查询？

Question

我有四个表：

• 锦标赛（ID，姓名，插槽，价格，游戏ID，platformId）
• 游戏（ID，姓名）
• 平台（ID，姓名）
• 参股（ id，tournamentId，playerId）

我想得到锦标赛的游戏名称，平台名称，插槽，价格，reservedSlots（参与计数），某些玩家（他的id是否由php提供）在本次比赛（布尔/真）和条件是： - 游戏ID必须是由PHP 提供特定的阵列 - platformId必须采用PHP

我创建了这样的事情提供指定数组，但它不工作正确：

PHP：

$platformsList = "'". implode("', '", $platforms) ."'"; // 
$gamesList = "'". implode("', '", $games). "'"; 

的mysql：

SELECT 
    t. NAME AS tournamentName, 
    t.id, 
    t.slots, 
    p. NAME, 
    g. NAME AS gameName, 
    t.price 
FROM 
    tournaments AS t, 
    platforms AS p, 
    games AS g, 
    participations AS part 
WHERE 
    t.PlatformId = p.Id 
AND t.GameId = g.Id 
AND t.Slots - (
    SELECT 
     count(*) 
    FROM 
     participations 
    WHERE 
     TournamentId = t.id 
) > 0 
AND part.TournamentId = t.Id 
AND t.PlatformId IN ($platformsList) 
AND t.GameId IN ($gamesList) 

Answer 1

我不会dwelve成H andling您的文章，并获得价值，我会认为一切都正常：

$possibleGameIDs = getPossibleGameIDs(); //function will return the array you need for possible game id values. Inside your function make sure that the id values are really numeric 
$possiblePlatformIDs = getPossiblePlatformIDs(); //function will return the array you need for possible platform id values. Inside your function make sure that the id values are really numeric 
$playerId = getPlayerId(); //function returns the player id and makes sure that it is really a number 

$sql = "select games.name, platforms.name, tournaments.slots, tournaments.price, ". 
     "(select count(*) from participations where participations.tournamentId = tournaments.tournamentId) as reservedSlots, ". 
     "(select count(*) > 0 from participations where participations.tournamentId = tournaments.tournamentId and playerId = ".$playerId.") as isParticipating ". 
     "from tournamens ". 
     "join games ". 
     "on tournaments.gameId = games.id ". 
     "join platforms ". 
     "on tournaments.platformId = platforms.id ". 
     "where games.id in (".implode(",", $possibleGameIDs).") and ". 
     "  platforms.id in (".implode(",", $possiblePlatformIDs).") and ". 
     "  tournaments.slots > 0" 

代码并没有进行测试，所以，请让我知道如果您在使用它的任何问题。当然，你需要运行它，但因为你没有指定你用什么来运行查询，我没有分配时间来处理运行它的技术细节。尽管注意SQL注入。