PHP Oracle查询选择语句在循环内变慢

时间:2019-02-26 11:15:02

标签: php oracle

我具有此php函数,用于检查文本文件中的数据并将其插入数据库。

//Get All Model
$qModel = oci_parse($c1, "SELECT MODELID, MODEL_NAME FROM MEP_TBL_MODEL WHERE ACTIVE = 'Y' AND LOCATION = 'PCBA' ORDER BY MODELID ASC");
oci_execute($qModel);
while($dModel = oci_fetch_array($qModel))
{
    //Configuration
    $qDtl = oci_parse($c1, "SELECT * FROM MEP_TBL_MODEL_CONFIGURATION WHERE MODELID_FK = '" . $dModel['MODELID'] . "'");
    oci_execute($qDtl);
    while($dDtl = oci_fetch_array($qDtl))
    {
        $modelIDAccept[] = $dDtl['CONFIGURATIONID'];
        $dateCode = date($dDtl['DATE_CODE']);
        $readRowAfter = date($dDtl['READ_ROW_AFTER']);
        $createFromFormat = $dDtl['CREATE_FROM_FORMAT'];
        $ipAddress = $dDtl['IP_ADDRESS'];
        $status = $dDtl['STATUS'];

        if($dDtl['SOURCE'] != "")
        {
            $source = "\\".$dDtl['SOURCE'];
        }
        else
        {
            $source = "";
        }

        if(empty($ipAddress))
        {
            $fileAccept = file_get_contents("\\\\192.168.184.13\\Reports\\".$dModel['MODEL_NAME'].$source."\\Accept\\Accept_".$dDtl['MODEL_CODE']."_".$dateCode."_".$dDtl['TS_CODE'].".txt");

            $linesAccept = explode("\n",$fileAccept);
            $rowsintimespanAccept = 0;

            for($i = $readRowAfter; $i < count($linesAccept); $i++)
            {
                $dateobjAccept = DateTime::createFromFormat($createFromFormat, $linesAccept[$i]);

                if($dateobjAccept < $toDateTime && $dateobjAccept > $fromDateTime)
                {
                    $rowsintimespanAccept++;

                    $logDate = $dateobjAccept->format('Y-m-d H:i:s');

                    //I put select query and insert here but it so slow.
                    $qChk = oci_parse($c1, "SELECT * FROM MEP_TBL_OUTPUT_DETAILS WHERE MODELID_FK = '" . $dModel['MODELID'] . "' AND RUNNING_DATE = TO_DATE('$logDate', 'YYYY-MM-DD hh24:mi:ss') AND TS_CODE = '" . $dDtl['TS_CODE'] . "' AND SHIFT = 'Morning' AND QUANTITY_STATUS = 'OK' AND CONFIGURATIONID_FK = '" . $dDtl['CONFIGURATIONID'] . "'");
                    oci_execute($qChk);
                    if(oci_fetch($qChk) > 0)
                    {
                    }
                    else
                    {
                        $qInsert = oci_parse($c1, "INSERT INTO MEP_TBL_OUTPUT_DETAILS(MODELID_FK, RUNNING_DATE, QUANTITY_STATUS, TS_CODE, SHIFT, CONFIGURATIONID_FK) VALUES('" . $dModel['MODELID'] . "', TO_DATE('$logDate', 'YYYY-MM-DD hh24:mi:ss'), 'OK', '" . $dDtl['TS_CODE'] . "', 'Morning', '" . $dDtl['CONFIGURATIONID'] . "')");
                        oci_execute($qInsert);
                    }
                }
            }

            $totalAccept[] = $rowsintimespanAccept;
        }
    }
}

当我尝试运行代码时,页面加载速度非常慢,有时它显示超时执行。

我的问题是,有什么方法可以使查询在循环内还是循环外快速进行?我知道它很慢,因为当我删除选择和插入查询时,加载页面只有3-4秒。

1 个答案:

答案 0 :(得分:0)

如果我已正确阅读您的代码,那么您所获得的只是一条可以在数据库上运行的MERGE语句。我不了解PHP,因此无法给您提供如何调用它的方法,但是我可以给您提供SQL语句来运行:

MERGE INTO mep_tbl_output_details tgt
  USING (SELECT mtm.modelid,
                mtm.model_name,
                mtmc.configurationid,
                mtmc.date_code,
                mtmc.read_row_after,
                mtmc.create_from_format,
                mtmc.ip_address,
                mtmc.status,
                mtmc.ts_code
         FROM   mep_tbl_model mtm
                INNER JOIN mep_tbl_model_configuration mtmc ON mtm.modelid = mtmc.modelid_fk
         WHERE  mtm.active = 'Y'
         AND    mtm.location = 'PCBA') src
    ON (tgt.modelid_fk = src.modelid
        AND tgt.ts_code = src.ts_code
        AND tgt.configurationid_fk = src.configurationid
        AND tgt.runningdate = :log_date
        AND tgt.shift = 'Morning'
        AND tgt.quantity_status = 'OK')
WHEN NOT MATCHED THEN
  INSERT (tgt.modelid_fk, tgt.running_date, tgt.quantity_status, tgt.ts_code, tgt.shift, tgt.configuration_fk)
  VALUES (src.modelid, :log_date, 'OK', src.ts_code, 'Morning', src.configurationid);

这将执行您正在使用循环重新创建的联接,将其链接回您要插入的表,并且仅在表中不存在行的情况下才插入行。

您需要编写PHP代码才能执行此操作,并已将log_date作为绑定变量传入。

通过绑定变量,您可以允许数据库跳过硬解析(即找出执行查询的最佳方法),从而节省时间。

通过不获取数据并在选择更多数据之前手动循环,并确定是否需要执行插入操作,可以跳过整个上下文切换和在网络上提取/推送数据的过程。让数据库来做繁重的工作;这就是它的设计目的!