PHP MYSQL超时问题

我有这样的SQL查询。当我通过php文件执行它时，它会给出超时错误。但是，当运行相同的查询thoruhg PHP myadmin它会在几秒钟内给出结果。PHP MYSQL超时问题

SELECT 
    cake_apartments.id, 
    cake_apartments.Headline, 
    cake_apartments.Description, 
    cake_apartments.photoset_id, 
    cake_apartments.Rental_Price, 
    cake_apartments.Bedrooms, 
    cake_apartments.Bathrooms 
FROM 
    cake_apartments,cake_neighborhoods 
WHERE 
    (cake_apartments.Rented = 0) 
    AND 
    (cake_apartments.status = 'Active') 
ORDER BY 
    cake_neighborhoods.Name DESC

我知道增加超时可能会解决问题。但我不想花费超过30秒的查询。

来源

2009-10-01 Andromeda

东西可能是错在某些循环。 – 2009-10-01 09:03:55

我同意亚历克，如果查询结果在几秒钟内在PHPMyAdmin中，那么你的脚本还有其他错误。 – Bobby 2009-10-01 09:05:14

您的查询接缝确定。我想说的主要问题是连接到数据库。你能在这里发表这个剧本吗？ phpMyAdmin可能以不同的方式连接到你的MySQL数据库。 – Frankie 2009-10-01 09:06:17

问题是你没有具体说明你的两张表之间的关系。它会在phpmyadmin中快速返回，因为phpmyadmin添加了一个LIMIT子句，允许mysql服务器快速停止发送行，永远不会超时。

您认为查询只是检索哪些公寓没有租用并且处于活动状态的行，但是您真正获得的是行数*您数据库中的邻居数量。

重写查询是这样的：

SELECT 
    cake_apartments.id, 
    cake_apartments.Headline, 
    cake_apartments.Description, 
    cake_apartments.photoset_id, 
    cake_apartments.Rental_Price, 
    cake_apartments.Bedrooms, 
    cake_apartments.Bathrooms 
FROM 
    cake_apartments 
JOIN 
    cake_neighborhoods 
    ON 
    cake_neighborhoods.id = cake_apartments.neighborhood_id 
WHERE 
    (cake_apartments.Rented = 0) 
    AND 
    (cake_apartments.status = 'Active') 
ORDER BY 
    cake_neighborhoods.Name DESC

注意，我只猜到了这两个表是如何在ON子句中相关的，所以如果我理解错了，你就必须进行调整。

来源

2009-10-01 13:21:00 longneck

如果您只想要存在匹配的行，那么您的SQL需要包含一个INNER JOIN。如果cake_neighborhoods.cake_apartments_id是在cake_neighborhoods表的外键的名字，我建议重写查询，如下：

SELECT 
    cake_apartments.id, 
    cake_apartments.Headline, 
    cake_apartments.Description, 
    cake_apartments.photoset_id, 
    cake_apartments.Rental_Price, 
    cake_apartments.Bedrooms, 
    cake_apartments.Bathrooms, 
    cake_neighborhoods.Name 
FROM 
    cake_apartments,cake_neighborhoods 
WHERE 
    (cake_apartments.Rented = 0) 
    AND 
    (cake_apartments.status = 'Active') 
    AND 
    cake_neighborhoods.cake_apartments_id = cake_apartments.id 
ORDER BY 
    cake_neighborhoods.Name DESC

来源

2009-10-01 13:43:28

PHP MYSQL超时问题

回答

相关问题