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基于PHP读取TXT文件向数据库导入海量数据的方法

Jun 13, 2016 am 11:53 AM
php txt Include based on import data database document method Massive of Record read

有一个TXT文件,包含了10万条记录,格式如下:

列1       列2       列3   列4   列5
a    00003131    0    0    adductive#1 adducting#1 adducent#1
a    00003356    0    0    nascent#1
a    00003553    0    0    emerging#2 emergent#2
a    00003700    0.25    0    dissilient#1

……………………后面有10万条………………

需求是要导入数据库中,数据表的结构为

word_id   自动增量
word     【adductive#1 adducting#1 adducent#1】这一个TXT记录要转换为3个SQL记录
value     =第三列-第四列;如果=0,则此条记录略过不插入数据表

复制代码 代码如下:


    $file = 'words.txt';//10W条记录的TXT源文件
    $lines = file_get_contents($file);
    ini_set('memory_limit', '-1');//不要限制Mem大小,否则会报错
    $line=explode("\n",$lines);
    $i=0;
    $sql="INSERT INTO words_sentiment (word,senti_type,senti_value,word_type) VALUES ";

    foreach($line as $key =>$li)
    {
        $arr=explode(" ",$li);
        $senti_value=$arr[2]-$arr[3];
        if($senti_value!=0)
        {
            if($i>=20000&&$i            {
             $mm=explode(" ",$arr[4]);               
                 foreach($mm as $m)   //【adductive#1 adducting#1 adducent#1】这一个TXT记录要转换为3个SQL记录                 {
                     $nn=explode("#",$m);
                     $word=$nn[0];
                     $sql.="(\"$word\",1,$senti_value,2),";//这个地方要注意到是 word有可能包含单引号(如jack's),因此我们要用双引号来包含word(注意转义)                      
                 }
            }
   $i++;
        }        
    }
    //echo $i;
    $sql=substr($sql,0,-1);//去掉最后一个逗号
    //echo $sql;
    file_put_contents('20000-25000.txt', $sql);  //批量导入数据库,5000条一次,大概需要40秒的样子;一次导入太多max_execution_time会不够,导致失败    
?>


1,海量数据导入到时候,要注意PHP的一些限制,可以临时调整一下,否则会报错

Allowed memory size of 33554432 bytes exhausted (tried to allocate 16 bytes)

2,PHP操作TXT文件

file_get_contents()

file_put_contents()

3,海量导入的时候,最好分批次导入,失败的几率小一些

4,海量导入之前,脚本一定要多次测试无误再使用,比如用100条数据来测试

5,导入之后,如果PHP的mem_limit还是不够的话,程序仍然跑不起来

(建议用修改php.ini的方式来提高mem_limit,而不是用临时的语句)

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