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HomeBackend DevelopmentPHP Tutorialphp 导入导出怎么做成有进度条??

我要做导入导出功能,为了界面友好,提示时想出线进度条显示进度,但我不知道怎么做!
我的导入是导入csv格式的文件,直接读取,然后 insert into 数据表中,导出也是直接查询生成csv格式文件,
我能做了一个进度条,但是不知道怎么来获取导入导出执行的进度,然后再通过ajax及js更新我的进度条。


回复讨论(解决方案)

客户端支持,通过
sliverlight,flash,html5

或者服务器端,你查apc扩展,,好像还一个,忘记名字了

这个用ajax很容易实现,你可以查下相关资料

假如有100个操作,你可以让第一个操作前进1,第二个操作前进3 ...

我建议不要做这个进度条效果,因为可能影响速度
只要弄一个"导入中"

使用缓存输出吧


// 省略其他html+js进度条代码$i = 0;while($i<100) {    // 执行内容    sleep(1);    // 根据总量和当前任务计算任务进度$i    $i = $i++;    echo '<script>进度条变更js到'.$i.'</script>';    ob_flash()    flash();}

<?php// 进度条演示代码,页面输出ob_start();header('Content-Type: text/html;charset=utf-8');echo '当前任务进度:<span id="p">0%</span>';echo str_repeat(' ', 4096);ob_flush();flush();// 执行任务$i = 0;while($i<100) {	    // 执行内容    sleep(1);    // 根据总量和当前任务计算任务进度$i    $i++;    echo '<script type="text/javascript">document.getElementById(\'p\').innerHTML = "'.$i.'%";</script>';    ob_flush();    flush();}

我以前做采集的时候写的,ie下有用,chrome下试了下进度不跑,懒得该了
http://devp.cosrc.com/scroll2.php

很不错,很强>>>

PHP code
// 省略其他html+js进度条代码
$i = 0;
while($i     // 执行内容
    sleep(1);
    // 根据总量和当前任务计算任务进度$i
    $i = $i++;
    echo '<script>进度条变更js到'.$i.'</script>';
    ob_flash()
    flash();
}
我会做进度条,关键是我不会这一步 “// 根据总量和当前任务计算任务进度$i”
我查询怎么做这一步呢?

引用 6 楼 hnxxwyq 的回复:
PHP code
// 省略其他html+js进度条代码
$i = 0;
while($i // 执行内容
sleep(1);
// 根据总量和当前任务计算任务进度$i
$i = $i++;
echo '<script>进度条变更js到'.$i.'</script>';
ob_flash()
flash();
}

……

通常这种进度条是这样做的
先获取整体任务,然后以一个维度来量化,再随时取当前进度,除以整体的,再化整

比如一个文件内有x行要读入,那么虽然每行内容大小不一,但可以看做计算完每行算完成总体进度1/x

那么如果要每处理完一行,就要响应不断的查询和进行一个输出,会影响性能的,而且你的导入方式必须能够量化每一步

比如这样
$file_size=文件内数据行数;
$current=0; //第一行,开始

while (没处理完)
{
  导入一行;
  $current++;
  输出 $current/$file_size * 100;
  //继续
}

显而易见,这得你的处理是逐步的....如果你是用某种现成的直接导入导出文件的函数,你根本不会获取到中间执行的过程.






引用 6 楼 hnxxwyq 的回复:
PHP code
// 省略其他html+js进度条代码
$i = 0;
while($i // 执行内容
sleep(1);
// 根据总量和当前任务计算任务进度$i
$i = $i++;
echo '<script>进度条变更js到'.$i.'</script>';
ob_flash()
flash();
}

……

导入时,你可以计算下csv的总行数n,然后每次固定读取m行(可以根据你的认为的效率修正),每次处理m行,则记录一次执行任务次数i,最后的进度比就是 floor(i*m / n) * 100;

伪代码

<?php$n = '总任务量';$m = '批次任务执行量';$i = 0;while($i * $m < $n) {    // 处理m个执行量的内容       // 统计执行任务量    $total = ++$i * $m;    // 计算进度比    $p = floor(min($total, $n) / $n);}

引用 10 楼 wxhbbdd 的回复:

引用 6 楼 hnxxwyq 的回复:
PHP code
// 省略其他html+js进度条代码
$i = 0;
while($i // 执行内容
sleep(1);
// 根据总量和当前任务计算任务进度$i
$i = $i++;
echo '<script>进度条变更js到'.$i.'</script>';
ob……



$n = '总任务量';
$m = '批次任务执行量';
$i = 0;

while($i * $m      // 处理m个执行量的内容
   
    // 统计执行任务量
    $total = ++$i * $m;

    // 计算进度比
    $p = floor(min($total, $n) / $n * 100); // 少乘了个100
}

APC实现方法:
 
安装APC,参照官方文档安装,可以使用PECL模块安装方法快速简捷,这里不说明
配置php.ini,设置参数 apc.rfc1867=1 ,使APC支持上传进度条功能,在APC源码说明文档里面有说明
代码范例: 
if ($_SERVER['REQUEST_METHOD'] == 'POST') {  //上传请求
    $status = apc_fetch('upload_' . $_POST['APC_UPLOAD_PROGRESS']);
    $status['done'] = 1;
    echo json_encode($status);  //输出给用户端页面里的ajax调用,相关文档请自己寻找
    exit;
} elseif (isset($_GET['progress_key'])) {   //读取上传进度
    $status = apc_fetch('upload_'.$_GET['progress_key']);
    echo json_encode($status);
    exit;
} else {
    //其他代码,比如上传表单等
}

uploadprogress 模块实现方法:
使用PECL模块安装方法安装该模块
php.ini里面设置 uploadprogress.file.filename_template = “/tmp/upd_%s.txt”
代码范例: 
if($_SERVER['REQUEST_METHOD']=='POST') {
    if (is_uploaded_file($_FILES['upfile']['tmp_name'])) {
        $upload_dir = 'your_path/';
        $ext        = strrchr($_FILES['video']['name'], '.');
        $sessid     = $_POST['UPLOAD_IDENTIFIER'] ;
        $tmpfile    = $upload_dir . $sessid;  
        $sessfile   = $upload_dir . $sessid .$ext;
        if (move_uploaded_file($_FILES['upfile']['tmp_name'],$tmpfile)) {
            //上传成功
        } else {
            //上传失败
    } else {
        //上传错误
        
} elseif (!empty($_GET['sessid'])) {
    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
    header("Cache-Control: no-store, no-cache, must-revalidate");
    header("Cache-Control: post-check=0, pre-check=0", false);
    header("Pragma: no-cache");
    header("Content-Type:text/html;charset=UTF-8");
 
    $unique_id = $_GET['sessid'];
    $uploadvalues = uploadprogress_get_info($unique_id);
 
    if (is_array($uploadvalues)) {
        echo json_encode($uploadvalues);
    } else {
        //读取进度失败,另外处理逻辑
    }
    
} else {
    //显示上传表单
}

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