关于MySQL性能的比较

需求：在传递一组职位编号的时候，需要统计该职位的 当天的投递情况 和 有历史记录以来总的投递量

解决方案一：

　　每次都进行一次数据库查询，遍历职位id，再根据职位id去查询相应时间内的投递量

 /**
     * [exportData 导出相应职位的投递量]
     * @param  [array] $params [需要查询的职位id,时间等]
     * @return [array]      [相应职位id的投递量]
     */
    public function exportData($params){
         //进行数据库查询 [查询所要导出的数据]
        $getWhere = '1 =1';
        //开始时间和结束时间
        if( (isset($params['start_date']) && $params['start_date']) && (isset($params['end_date']) && $params['end_date']) ){
            $getWhere.=" and `addtime` between '{$params['start_date']}' and '{$params['end_date']}' ";
        }
        $jobidsArr = explode("," , $params['jobids']);
        $count = [];
        $dealCount = [];
        $actionTotal = [];
        $actionDealTotal = [];
        foreach ($jobidsArr as $key => $value) {
            $sql = "SELECT count(*) as count from hr_action where jobid = ".$value. " and ".$getWhere;
            $count[$key] = $this->db->findOne($sql);//返回数组

            //获取当天的处理状态
            $sqlDeal = "SELECT count(*) as count from hr_action where jobid = ".$value. " and `astatus` > 0 and ".$getWhere;
            $dealCount[$key] = $this->db->findOne($sqlDeal);//返回数组

            //总职位数和总处理情况进行查询
            $sqlTotal = "SELECT count(*) as count from hr_action where jobid = $value";
            $actionTotal[$key] = $this->db->findOne($sqlTotal);

            $sqlDealTotal = "SELECT count(*) as count from hr_action where jobid = $value and `astatus` > 0";

            $actionDealTotal[$key] = $this->db->findOne($sqlDealTotal);

        }

        foreach ($count as $ckey => $cvalue) {
            $actionCount[$ckey] = $cvalue['count'];
        }
        foreach ($dealCount as $dkey => $dvalue) {
            $actionDealCount[$dkey] = $dvalue['count'];
        }
        foreach ($actionTotal as $atkey => $atvalue) {
            $actionTotalCount[$atkey] = $atvalue['count'];
        }
        foreach ($actionDealTotal as $adtkey => $adtvalue) {
            $actionDealTotalCount[$adtkey] = $adtvalue['count'];
        }

        return ['jobid'=> $jobidsArr , 'actionCount'=> $actionCount , 'actionDealCount' => $actionDealCount , 'actionTotalCount'=>$actionTotalCount,'actionDealTotalCount'=>$actionDealTotalCount];
    }

以上这种方法思路确实很简单，但是仔细查看，在运行的时候可以算一下进行了多少次的数据库查询，每一次的foreach循环都会进行四次查询数据库，当我一次传递30个职位的时候，就是4*30 次数据库查询了，由于数据库中的数量比较大，每次都全部便利一次这样的查询不满才怪呢。咳咳咳咳。。

方法二：尽量的减少数据库的查询，对数据库的操作越少越好。为什么不在第一次遍历投递情况的时候，把所有的投递情况都遍历出来保存到一个数组中，然后对数组进行操作，把对数据库的操作转换成php在内存中操作，这样不是挺好的吗？

因此，首次遍历的时候利用in 查询，把所有的投递情况都查询出来。

/**
     * [exportData 导出相应职位的投递量]
     * @param  [array] $params [需要查询的职位id,时间等]
     * @return [array]      [相应职位id的投递量]
     */
    public function exportData($params){
         //进行数据库查询 [查询所要导出的数据]
        $getWhere = '1 =1';
        //开始时间和结束时间
        if( (isset($params['start_date']) && $params['start_date']) && (isset($params['end_date']) && $params['end_date']) ){
            $getWhere.=" and `addtime` between '{$params['start_date']}' and '{$params['end_date']}' ";
        }
        $jobids = $params['jobids'];//获取传入的职位id
        $jobidsArr = explode("," , $params['jobids']);

        //根据职位id来查询相应的职位信息和公司信息
        $sqlInfo = "SELECT j.`title`,j.`id` from hr_job as j where id in ($jobids)";
        $jobTitle = $this->db->find($sqlInfo);
        $sqlCompany = "SELECT c.`comname`,j.`id` from hr_company as c right join hr_job as j on j.`user_id` = c.`user_id` where j.`id` in ($jobids)";
        $jobCompany = $this->db->find($sqlCompany);

        //print_r($jobTitle);
        $newjobTemp = [];
        foreach ($jobTitle as $key => $value) {
            $newjobTemp[$value['id']] = $value['title'];
        }

        $companyTemp = [];
        foreach ($jobCompany as $key => $value) {
           $companyTemp[$value['id']] = $value['comname'];
        }
        //print_r($newjobTemp);
        //
        //

                        /*************总职位数和总处理情况进行查询*************/
            $sqlTotal = "SELECT `jobid`,`addtime` ,`astatus` from hr_action where jobid in ($jobids)";
            $sqlDealTotal = "SELECT `jobid`,`addtime` ,`astatus` from hr_action where jobid in ($jobids) and ".$getWhere;

            $retTotal = $this->db->find($sqlTotal);//返回总数
            $retDealTotal = $this->db->find($sqlDealTotal);//返回当天处理总数

                     /*************总职位数和总处理情况进行查询*************/

                $temp1 = [];
                foreach ($retTotal as $ckey => $cvalue) {
                    $temp1[$ckey] = $cvalue['jobid'];
                }
                $actionCount1 = array_count_values($temp1);
                //print_r($actionCount1);//投递总数

                $temp2 = [];
                foreach ($retTotal as $dkey => $dvalue) {
                    $temp2[$dkey] = [$dvalue['astatus'],$dvalue['jobid']];
                }
                //print_r($temp2);

                $temp3 = [];
                foreach ($retDealTotal as $atkey => $atvalue) {
                    $temp3[$atkey] = $atvalue['jobid'];
                }
                $actionCount3 = array_count_values($temp3);
                //print_r($actionCount3);

                $temp4 = [];
                foreach ($retDealTotal as $adtkey => $adtvalue) {
                    $temp4[$adtkey] = [$adtvalue['astatus'],$adtvalue['jobid']];
                }
                //print_r($temp4);

            //按照预定义格式输出
            $actionCount = [];//总投递量
            $actionDayCount = [];//当天投递总量
            $adealCount = [];//定义一个新数组，存放相对应的总处理量
            $adaydealCount = [];//定义一个新数组，存放相对应的当天总处理量
            $actionDealCount = [];//存放转换后的总处理量
            $actionDayDealCount = [];//存放转换后的当天处理量
            $actionJobTitle = [];//职位名称
            $actionJobCompany = [];//公司名称
            foreach ($jobidsArr as $key => $value) {//循环传入的IDS

                $i = ;
                foreach ($temp2 as $t2key => $t2value) {
                    if ($value == $t2value[]) {
                        if ($t2value[] > ) { $i++; }
                    }
                    $adealCount[$value] = $i;
                }

                $j = ;
                foreach ($temp4 as $t4key => $t4value) {
                    if ($value == $t4value[]) {
                        if ($t4value[] > ) { $j++; }
                    }
                    $adaydealCount[$value] = $j;
                }

                $actionCount[$key] = $actionCount1[$value];
                $actionDayCount[$key] = isset($actionCount3[$value])?$actionCount3[$value]:;
                $actionDealCount[$key] = $adealCount[$value];
                $actionDayDealCount[$key] = $adaydealCount[$value];
                $actionJobTitle[$key] = $newjobTemp[$value];
                $actionJobCompany[$key] = $companyTemp[$value];
            }

           // print_r($actionJobTitle);
           /* print_r($actionCount);//总投递量
            print_r($actionDayCount);//当天投递总量
            print_r($actionDealCount);//总处理量
            print_r($actionDayDealCount);//当天处理量*/

        return ['jobid'=> $jobidsArr , 'actionCount'=> $actionCount , 'actionDealCount' => $actionDealCount , 'actionDayCount'=>$actionDayCount,'actionDayDealCount'=>$actionDayDealCount,'actionJobTitle'=>$actionJobTitle , 'actionJobCompany'=>$actionJobCompany];
    }

导出数据，都是使用的同一套方法

 //导出相应职位的投递情况
    public function exportData($params = array()){
    /*[start_date] => 2016-11-23 12:09:05
    [end_date] => 2016-11-24 12:09:07
    [jobids] => 12,23,234,345,345,4564,5646*/
        /*echo "<pre>";
        print_r($params);*/
        $jobModel = new joblist_jobModel();
        $job_action_count = $jobModel->exportData($params);

        ini_set('memory_limit','500M');
        set_time_limit();

        $jobids = $job_action_count['jobid'];//查询的职位id
        $actionDayCount = $job_action_count['actionDayCount'];//当天的投递量
        $actionDayDealCount = $job_action_count['actionDayDealCount'];//当天处理量
        $actionCount = $job_action_count['actionCount'];//总投递量
        $actionDealCount = $job_action_count['actionDealCount'];//总处理量
        $actionJobTitle = $job_action_count['actionJobTitle'];//职位标题
        $actionJobCompany = $job_action_count['actionJobCompany'];//企业名称
        if(empty($jobids)){
            exit("暂无数据");
        }

        $temp = [];
        foreach ($jobids as $key => $value) {
            $temp[$key] = [$value,$actionJobCompany[$key],$actionJobTitle[$key],$actionDayCount[$key], $actionDayDealCount[$key], $actionCount[$key], $actionDealCount[$key]];
        }
        /*print_r($temp);
        exit;*/

        $column_name = array();
        header ( "Content-type:application/vnd.ms-excel" );
        header ( "Content-Disposition:filename=" . iconv ( "UTF-8", "GBK", date("Y-m-d_H_i_s" , time())."-".rand(,) ) . ".csv" );
        // 打开PHP文件句柄，php://output 表示直接输出到浏览器
        $fp = fopen('php://output', 'a');
        $head = ['职位编号','企业名称','职位名称','当天的投递量','当天的处理量','总投递量','总处理量'];
        foreach ($head as $i => $v) {
            $column_name[$i] = iconv('utf-8', 'GBK', $v);
        }
        fputcsv($fp, $column_name);
        foreach ($temp as $tkey => $tvalue ) {
            $rows = array();
            foreach ($tvalue as $newkey => $newvalue) {
                $rows[] = iconv('utf-8', 'GBK', $newvalue);
            }
            fputcsv($fp, $rows);
        }
        ob_flush();
        flush();
        die();
    }