如何将200,000行的巨大CSV文件导入MySQL(异步和快速)？

Question

我必须编写一个PHP脚本,将数据从给定的CSV文件导入MySQL数据库.给定的CSV文件最多可包含200,000行.我尝试了以下但出现了问题:

1. LOAD DATA LOCAL INFILE:我不能使用LOAD DATA LOCAL INFILE语句,因为我想在上传行之前先做一些验证,而且,我们的DB管理员不希望我使用该语句,我不知道为什么.
2. FOR LOOP:在FOR循环内逐行插入将花费太多时间导致连接超时.

现在,我正在考虑一种解决方案,将CSV文件拆分为较小的块,然后异步插入它们.我已经完成了CSV的拆分,但我目前不知道如何以快速和安全的方式异步插入我的数据库.但我听说我将在这里使用Ajax.

您可以推荐哪种解决方案？非常感谢提前!

Answer 1

感谢所有给出这个问题答案的人.我发现了一个解决方案!只是想分享它,以防有人需要创建一个PHP脚本,将一个巨大的CSV文件导入MySQL数据库(异步和快速!)我已经用400,000行测试了我的代码,并在几秒钟内完成导入.我相信它适用于较大的文件,您只需修改最大上传文件大小.

在此示例中,我将导入包含两列(name,contact_number)的CSV文件到包含相同列的MySQL DB中.

您的CSV文件应如下所示:

Ana,0906123489

约翰,0908989199

彼得,0908298392

...

...

所以,这是解决方案.

首先,创建你的表

CREATE TABLE `testdb`.`table_test`
( `id` INT NOT NULL AUTO_INCREMENT ,
`name` VARCHAR(100) NOT NULL ,
`contact_number` VARCHAR(100) NOT NULL ,
PRIMARY KEY (`id`)) ENGINE = InnoDB;

其次,我有4个PHP文件.您所要做的就是将其放入一个文件夹中.PHP文件如下:

的index.php

<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="csv" value="" />
<input type="submit" name="submit" value="Save" /></form>

connect.php

<?php
//modify your connections here
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "testDB";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
?>

senddata.php

<?php
include('connect.php');
$data = $_POST['file'];
$handle = fopen($data, "r");
$test = file_get_contents($data);
if ($handle) {
    $counter = 0;
    //instead of executing query one by one,
    //let us prepare 1 SQL query that will insert all values from the batch
    $sql ="INSERT INTO table_test(name,contact_number) VALUES ";
    while (($line = fgets($handle)) !== false) {
      $sql .= "($line),";
      $counter++;
    }
    $sql = substr($sql, 0, strlen($sql) - 1);
     if ($conn->query($sql) === TRUE) {
    } else {
     }
    fclose($handle);
} else {  
} 
//unlink CSV file once already imported to DB to clear directory
unlink($data);
?>

upload.php的

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.1/jquery.js"></script>
<script>
//Declaration of function that will insert data into database
 function senddata(filename){
        var file = filename;
        $.ajax({
            type: "POST",
            url: "senddata.php",
            data: {file},
            async: true,
            success: function(html){
                $("#result").html(html);
            }
        })
        }
 </script>
<?php
$csv = array();
$batchsize = 1000; //split huge CSV file by 1,000, you can modify this based on your needs
if($_FILES['csv']['error'] == 0){
    $name = $_FILES['csv']['name'];
    $ext = strtolower(end(explode('.', $_FILES['csv']['name'])));
    $tmpName = $_FILES['csv']['tmp_name'];
    if($ext === 'csv'){ //check if uploaded file is of CSV format
        if(($handle = fopen($tmpName, 'r')) !== FALSE) {
            set_time_limit(0);
            $row = 0;
            while(($data = fgetcsv($handle)) !== FALSE) {
                $col_count = count($data);
                //splitting of CSV file :
                if ($row % $batchsize == 0):
                    $file = fopen("minpoints$row.csv","w");
                endif;
                $csv[$row]['col1'] = $data[0];
                $csv[$row]['col2'] = $data[1];
                $min = $data[0];
                $points = $data[1];
                $json = "'$min', '$points'";
                fwrite($file,$json.PHP_EOL);
                //sending the splitted CSV files, batch by batch...
                if ($row % $batchsize == 0):
                    echo "<script> senddata('minpoints$row.csv'); </script>";
                endif;
                $row++; 
            }
            fclose($file);
            fclose($handle);
        }
    }
    else
    {
        echo "Only CSV files are allowed.";
    }
    //alert once done.
    echo "<script> alert('CSV imported!') </script>";
}
?>

而已!您已经拥有一个纯PHP脚本,可以在几秒钟内导入多个行!:)(感谢我的合作伙伴,他教过我并告诉我如何使用ajax)