php - 使用 IN 搜索带有数组的数据库

Question

我有一条 SQL 语句：

$sql = "SELECT * FROM user_events WHERE userID =" . $uid . " OR groupID = (IN ($gId) WHERE userID IS NULL) ORDER BY timestamp DESC";

打印时看起来像这样：

SELECT * FROM user_events WHERE userID = 34 OR groupID =(IN (44,45) WHERE uID IS NULL) ORDER BY timestamp DESC

我要做的是从数据库中选择userId匹配特定变量或groupID匹配 CSV 变量的任何userID行NULL。

谁能解释我在这里做错了什么？我被卡住了！

score 9 · Accepted Answer

IN是操作员，而不是……那个。你也想要AND，没有WHERE。

$sql = "SELECT * FROM user_events
        WHERE userID = $uid
           OR groupID IN ($gId) AND userID IS NULL
        ORDER BY timestamp DESC";

score 1 · Accepted Answer

$sql = "SELECT * FROM user_events 
       WHERE userID =" . $uid . " 
       OR (groupID IN ($gId) AND userID IS NULL) ORDER BY timestamp DESC";

score 0 · Accepted Answer

我认为你想要类似的东西：

SELECT * FROM user_events 
WHERE (userID = 34 OR groupID IN (44,45)) and uID IS NULL
ORDER BY timestamp DESC

在 PHP 中，这可能看起来像：

$sql = "SELECT * FROM user_events WHERE (userID =". $uid . " OR groupID IN ($gId)) AND userID IS NULL ORDER BY timestamp DESC";

3 回答 3