Mysql - Codeigniter 活动记录帮助

Question

我有这段代码可以从数据库中提取一些数据，

$this->db->select('job_id, jobs.employer_id, COUNT(company_job_id) AS views, COUNT(like_job_id) AS likes, logo, company_name')
        ->from('jobs')
        ->join('company_likes', 'company_likes.like_job_id = jobs.employer_id', 'left')
        ->join('company_views', 'company_views.company_job_id = jobs.employer_id', 'left')
        ->join('employers', 'employers.employer_id = jobs.employer_id', 'left')
        ->group_by('company_views.company_job_id');

        $query = $this->db->get();

        return $query->result_array();

我得到了一些奇怪的结果，下面是当 company_likes 表中有 0 条记录和 company_views 表中有 6 条记录时的结果转储照片，

    Array
(
    [0] => Array
        (
            [job_id] => 1
            [employer_id] => 1
            [views] => 6
            [likes] => 0
            [logo] => 11d4df5e2f7db152cd9bcc3782dd03b0.jpg
            [company_name] => Test Company
        )

)

但是，如果我在 company_views 表中有 6 条记录，并且在 company likes 表中有 1 条记录，我会得到以下结果，

Array
(
    [0] => Array
        (
            [job_id] => 1
            [employer_id] => 1
            [views] => 6
            [likes] => 6
            [logo] => 11d4df5e2f7db152cd9bcc3782dd03b0.jpg
            [company_name] => Test Company
        )

)

就好像浏览量和点赞数成倍增加之类的，我怎样才能让我得到的是数据库中内容的真实表示？

这里是相关数据和表格的导出，

--
-- Table structure for table `company_likes`
--

CREATE TABLE IF NOT EXISTS `company_likes` (
  `like_id` int(10) NOT NULL AUTO_INCREMENT,
  `like_job_id` int(11) NOT NULL,
  PRIMARY KEY (`like_id`),
  KEY `fk_company_likes_jobs1` (`like_job_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;

--
-- Dumping data for table `company_likes`
--

INSERT INTO `company_likes` (`like_id`, `like_job_id`) VALUES
(1, 1);

-- --------------------------------------------------------

--
-- Table structure for table `company_views`
--

CREATE TABLE IF NOT EXISTS `company_views` (
  `view_id` int(10) NOT NULL AUTO_INCREMENT,
  `company_job_id` int(11) NOT NULL,
  PRIMARY KEY (`view_id`),
  KEY `fk_company_views_jobs1` (`company_job_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;

--
-- Dumping data for table `company_views`
--

INSERT INTO `company_views` (`view_id`, `company_job_id`) VALUES
(1, 1),
(2, 1),
(3, 1),
(4, 1),
(5, 1),
(6, 1);

-- --------------------------------------------------------

--
-- Table structure for table `employers`
--

CREATE TABLE IF NOT EXISTS `employers` (
  `employer_id` int(11) NOT NULL AUTO_INCREMENT,
  `company_name` varchar(80) NOT NULL,
  `company_summary` text NOT NULL,
  `logo` varchar(60) NOT NULL,
  `alternative_ads` varchar(100) DEFAULT NULL,
  `facebook_url` varchar(100) DEFAULT NULL,
  `twitter_url` varchar(100) DEFAULT NULL,
  `user_id` int(10) NOT NULL,
  PRIMARY KEY (`employer_id`),
  KEY `fk_employers_users` (`user_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

--
-- Dumping data for table `employers`
--

INSERT INTO `employers` (`employer_id`, `company_name`, `company_summary`, `logo`, `alternative_ads`, `facebook_url`, `twitter_url`, `user_id`) VALUES
(1, 'Test Company', 'Test company is excatly what it says it is a test company, we have created this test company so that we can see that moovjob is functioning as it should be and that everything is upload, saving, applying and generally saving as we would expect.', '11d4df5e2f7db152cd9bcc3782dd03b0.jpg', 'http://www.simonainley.info/alternative', 'http://www.facebook.com/simon.ainley', 'http://www.twitter.com/simonainley', 2),
(2, 'Test Company', 'Test company summary', '006474cf842654eb28deebec7e4dcbb9.png', 'http://www.simonainley.info/alternative', 'http://www.facebook.com/simon.ainley', 'http://www.twitter.com/simonainley', 5);

-- --------------------------------------------------------

--
-- Table structure for table `jobs`
--

CREATE TABLE IF NOT EXISTS `jobs` (
  `job_id` int(11) NOT NULL AUTO_INCREMENT,
  `job_title` varchar(80) NOT NULL,
  `sectors` varchar(255) NOT NULL,
  `salary` varchar(20) NOT NULL,
  `retrain` enum('yes','no') NOT NULL,
  `bonuses_available` enum('yes','no') NOT NULL,
  `bonus_description` text,
  `job_summary` text NOT NULL,
  `job_description` text NOT NULL,
  `employer_id` int(11) NOT NULL,
  PRIMARY KEY (`job_id`),
  KEY `fk_jobs_employers1` (`employer_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;

--
-- Dumping data for table `jobs`
--

INSERT INTO `jobs` (`job_id`, `job_title`, `sectors`, `salary`, `retrain`, `bonuses_available`, `bonus_description`, `job_summary`, `job_description`, `employer_id`) VALUES
(1, 'Test Jobtitle', 'Sector 1', '£25,000', 'no', 'yes', 'Bonus Description', 'Job Summary', 'Job Description', 1);

--
-- Constraints for dumped tables
--

--
-- Constraints for table `company_views`
--
ALTER TABLE `company_views`
  ADD CONSTRAINT `company_views_ibfk_1` FOREIGN KEY (`company_job_id`) REFERENCES `jobs` (`employer_id`) ON DELETE NO ACTION ON UPDATE NO ACTION;

--
-- Constraints for table `employers`
--
ALTER TABLE `employers`
  ADD CONSTRAINT `fk_employers_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`user_id`) ON DELETE NO ACTION ON UPDATE NO ACTION;

--
-- Constraints for table `jobs`
--
ALTER TABLE `jobs`
  ADD CONSTRAINT `fk_jobs_employers1` FOREIGN KEY (`employer_id`) REFERENCES `employers` (`employer_id`) ON DELETE NO ACTION ON UPDATE NO ACTION;

Answer 1

您是否考虑过分解查询？您可以创建一个临时表，结合部分查询，然后用第二个查询完成初始查询的另一部分！

我认为活动记录类没有任何东西可以创建临时表，因此您需要手动完成。

我还可以看到查询被分解成更小的块并使用 php 为您进行一些比较和计数。

否则一些示例数据和表创建信息可能有用，因此我们也可以尝试查询。